text: /*
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   */
  
  /** \file
   * \ingroup edinterface
   */
  
  #include <assert.h>
  #include <limits.h>
  #include <math.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include "MEM_guardedalloc.h"
  
  #include "DNA_armature_types.h"
  #include "DNA_screen_types.h"
  #include "DNA_userdef_types.h"
  
  #include "BLI_alloca.h"
  #include "BLI_listbase.h"
  #include "BLI_math.h"
  #include "BLI_rect.h"
  #include "BLI_string.h"
  #include "BLI_utildefines.h"
  
  #include "BLT_translation.h"
  
  #include "BKE_anim_data.h"
  #include "BKE_context.h"
  #include "BKE_global.h"
  #include "BKE_idprop.h"
  #include "BKE_screen.h"
  
  #include "RNA_access.h"
  
  #include "UI_interface.h"
  
  #include "ED_armature.h"
  
  #include "WM_api.h"
  #include "WM_types.h"
  
  #include "interface_intern.h"
  
  /* Show an icon button after each RNA button to use to quickly set keyframes,
   * this is a way to display animation/driven/override status, see T54951. */
  #define UI_PROP_DECORATE
  /* Alternate draw mode where some buttons can use single icon width,
   * giving more room for the text at the expense of nicely aligned text. */
  #define UI_PROP_SEP_ICON_WIDTH_EXCEPTION
  
  /* -------------------------------------------------------------------- */
  /** \name Structs and Defines
   * \{ */
  
  #define UI_OPERATOR_ERROR_RET(_ot, _opname, return_statement) \
    if (ot == NULL) { \
      ui_item_disabled(layout, _opname); \
      RNA_warning("'%s' unknown operator", _opname); \
      return_statement; \
    } \
    (void)0
  
  #define UI_ITEM_PROP_SEP_DIVIDE 0.4f
  
  /* uiLayoutRoot */
  
  typedef struct uiLayoutRoot {
    struct uiLayoutRoot *next, *prev;
  
    int type;
    int opcontext;
  
    int emw, emh;
    int padding;
  
    uiMenuHandleFunc handlefunc;
    void *argv;
  
    const uiStyle *style;
    uiBlock *block;
    uiLayout *layout;
  } uiLayoutRoot;
  
  /* Item */
  
  typedef enum uiItemType {
    ITEM_BUTTON,
  
    ITEM_LAYOUT_ROW,
    ITEM_LAYOUT_COLUMN,
    ITEM_LAYOUT_COLUMN_FLOW,
    ITEM_LAYOUT_ROW_FLOW,
    ITEM_LAYOUT_GRID_FLOW,
    ITEM_LAYOUT_BOX,
    ITEM_LAYOUT_ABSOLUTE,
    ITEM_LAYOUT_SPLIT,
    ITEM_LAYOUT_OVERLAP,
    ITEM_LAYOUT_RADIAL,
  
    ITEM_LAYOUT_ROOT
  #if 0
        TEMPLATE_COLUMN_FLOW,
    TEMPLATE_SPLIT,
    TEMPLATE_BOX,
  
    TEMPLATE_HEADER,
    TEMPLATE_HEADER_ID,
  #endif
  } uiItemType;
  
  typedef struct uiItem {
    void *next, *prev;
    uiItemType type;
    int flag;
  } uiItem;
  
  enum {
    UI_ITEM_AUTO_FIXED_SIZE = 1 << 0,
    UI_ITEM_FIXED_SIZE = 1 << 1,
  
    UI_ITEM_BOX_ITEM = 1 << 2, /* The item is "inside" a box item */
    UI_ITEM_PROP_SEP = 1 << 3,
    UI_ITEM_INSIDE_PROP_SEP = 1 << 4,
    /* Show an icon button next to each property (to set keyframes, show status).
     * Enabled by default, depends on 'UI_ITEM_PROP_SEP'. */
    UI_ITEM_PROP_DECORATE = 1 << 5,
    UI_ITEM_PROP_DECORATE_NO_PAD = 1 << 6,
  };
  
  typedef struct uiButtonItem {
    uiItem item;
    uiBut *but;
  } uiButtonItem;
  
  struct uiLayout {
    uiItem item;
  
    uiLayoutRoot *root;
    bContextStore *context;
    uiLayout *parent;
    ListBase items;
  
    char heading[UI_MAX_NAME_STR];
  
    /** Sub layout to add child items, if not the layout itself. */
    uiLayout *child_items_layout;
  
    int x, y, w, h;
    float scale[2];
    short space;
    bool align;
    bool active;
    bool active_default;
    bool activate_init;
    bool enabled;
    bool redalert;
    bool keepaspect;
    /** For layouts inside gridflow, they and their items shall never have a fixed maximal size. */
    bool variable_size;
    char alignment;
    char emboss;
    /** for fixed width or height to avoid UI size changes */
    float units[2];
  };
  
  typedef struct uiLayoutItemFlow {
    uiLayout litem;
    int number;
    int totcol;
  } uiLayoutItemFlow;
  
  typedef struct uiLayoutItemGridFlow {
    uiLayout litem;
  
    /* Extra parameters */
    bool row_major;    /* Fill first row first, instead of filling first column first. */
    bool even_columns; /* Same width for all columns. */
    bool even_rows;    /* Same height for all rows. */
    /**
     * - If positive, absolute fixed number of columns.
     * - If 0, fully automatic (based on available width).
     * - If negative, automatic but only generates number of columns/rows
     *   multiple of given (absolute) value.
     */
    int columns_len;
  
    /* Pure internal runtime storage. */
    int tot_items, tot_columns, tot_rows;
  } uiLayoutItemGridFlow;
  
  typedef struct uiLayoutItemBx {
    uiLayout litem;
    uiBut *roundbox;
  } uiLayoutItemBx;
  
  typedef struct uiLayoutItemSplit {
    uiLayout litem;
    float percentage;
  } uiLayoutItemSplit;
  
  typedef struct uiLayoutItemRoot {
    uiLayout litem;
  } uiLayoutItemRoot;
  
  /** \} */
  
  /* -------------------------------------------------------------------- */
  /** \name Item
   * \{ */
  
  static const char *ui_item_name_add_colon(const char *name, char namestr[UI_MAX_NAME_STR])
  {
    int len = strlen(name);
  
    if (len != 0 && len + 1 < UI_MAX_NAME_STR) {
      memcpy(namestr, name, len);
      namestr[len] = ':';
      namestr[len + 1] = '\0';
      return namestr;
    }
  
    return name;
  }
  
  static int ui_item_fit(
      int item, int pos, int all, int available, bool is_last, int alignment, float *extra_pixel)
  {
    /* available == 0 is unlimited */
    if (ELEM(0, available, all)) {
      return item;
    }
  
    if (all > available) {
      /* contents is bigger than available space */
      if (is_last) {
        return available - pos;
      }
      else {
        float width = *extra_pixel + (item * available) / (float)all;
        *extra_pixel = width - (int)width;
        return (int)width;
      }
    }
    else {
      /* contents is smaller or equal to available space */
      if (alignment == UI_LAYOUT_ALIGN_EXPAND) {
        if (is_last) {
          return available - pos;
        }
        else {
          float width = *extra_pixel + (item * available) / (float)all;
          *extra_pixel = width - (int)width;
          return (int)width;
        }
      }
      else {
        return item;
      }
    }
  }
  
  /* variable button size in which direction? */
  #define UI_ITEM_VARY_X 1
  #define UI_ITEM_VARY_Y 2
  
  static int ui_layout_vary_direction(uiLayout *layout)
  {
    return ((ELEM(layout->root->type, UI_LAYOUT_HEADER, UI_LAYOUT_PIEMENU) ||
             (layout->alignment != UI_LAYOUT_ALIGN_EXPAND)) ?
                UI_ITEM_VARY_X :
                UI_ITEM_VARY_Y);
  }
  
  static bool ui_layout_variable_size(uiLayout *layout)
  {
    /* Note that this code is probably a bit flakey, we'd probably want to know whether it's
     * variable in X and/or Y, etc. But for now it mimics previous one,
     * with addition of variable flag set for children of grid-flow layouts. */
    return ui_layout_vary_direction(layout) == UI_ITEM_VARY_X || layout->variable_size;
  }
  
  /* estimated size of text + icon */
  static int ui_text_icon_width(uiLayout *layout, const char *name, int icon, bool compact)
  {
    bool variable;
    const int unit_x = UI_UNIT_X * (layout->scale[0] ? layout->scale[0] : 1.0f);
  
    if (icon && !name[0]) {
      return unit_x; /* icon only */
    }
  
    variable = ui_layout_variable_size(layout);
  
    if (variable) {
      if (!icon && !name[0]) {
        return unit_x; /* No icon or name. */
      }
      if (layout->alignment != UI_LAYOUT_ALIGN_EXPAND) {
        layout->item.flag |= UI_ITEM_FIXED_SIZE;
      }
      const uiFontStyle *fstyle = UI_FSTYLE_WIDGET;
      float margin = compact ? 1.25 : 1.50;
      if (icon) {
        /* It may seem odd that the icon only adds (unit_x / 4)
         * but taking margins into account its fine, except
         * in compact mode a bit more margin is required. */
        margin += compact ? 0.35 : 0.25;
      }
      return UI_fontstyle_string_width(fstyle, name) + (unit_x * margin);
    }
    else {
      return unit_x * 10;
    }
  }
  
  static void ui_item_size(uiItem *item, int *r_w, int *r_h)
  {
    if (item->type == ITEM_BUTTON) {
      uiButtonItem *bitem = (uiButtonItem *)item;
  
      if (r_w) {
        *r_w = BLI_rctf_size_x(&bitem->but->rect);
      }
      if (r_h) {
        *r_h = BLI_rctf_size_y(&bitem->but->rect);
      }
    }
    else {
      uiLayout *litem = (uiLayout *)item;
  
      if (r_w) {
        *r_w = litem->w;
      }
      if (r_h) {
        *r_h = litem->h;
      }
    }
  }
  
  static void ui_item_offset(uiItem *item, int *r_x, int *r_y)
  {
    if (item->type == ITEM_BUTTON) {
      uiButtonItem *bitem = (uiButtonItem *)item;
  
      if (r_x) {
        *r_x = bitem->but->rect.xmin;
      }
      if (r_y) {
        *r_y = bitem->but->rect.ymin;
      }
    }
    else {
      if (r_x) {
        *r_x = 0;
      }
      if (r_y) {
        *r_y = 0;
      }
    }
  }
  
  static void ui_item_position(uiItem *item, int x, int y, int w, int h)
  {
    if (item->type == ITEM_BUTTON) {
      uiButtonItem *bitem = (uiButtonItem *)item;
  
      bitem->but->rect.xmin = x;
      bitem->but->rect.ymin = y;
      bitem->but->rect.xmax = x + w;
      bitem->but->rect.ymax = y + h;
  
      ui_but_update(bitem->but); /* for strlen */
    }
    else {
      uiLayout *litem = (uiLayout *)item;
  
      litem->x = x;
      litem->y = y + h;
      litem->w = w;
      litem->h = h;
    }
  }
  
  static void ui_item_move(uiItem *item, int delta_xmin, int delta_xmax)
  {
    if (item->type == ITEM_BUTTON) {
      uiButtonItem *bitem = (uiButtonItem *)item;
  
      bitem->but->rect.xmin += delta_xmin;
      bitem->but->rect.xmax += delta_xmax;
  
      ui_but_update(bitem->but); /* for strlen */
    }
    else {
      uiLayout *litem = (uiLayout *)item;
  
      if (delta_xmin > 0) {
        litem->x += delta_xmin;
      }
      else {
        litem->w += delta_xmax;
      }
    }
  }
  
  /** \} */
  
  /* -------------------------------------------------------------------- */
  /** \name Special RNA Items
   * \{ */
  
  int uiLayoutGetLocalDir(const uiLayout *layout)
  {
    switch (layout->item.type) {
      case ITEM_LAYOUT_ROW:
      case ITEM_LAYOUT_ROOT:
      case ITEM_LAYOUT_OVERLAP:
        return UI_LAYOUT_HORIZONTAL;
      case ITEM_LAYOUT_COLUMN:
      case ITEM_LAYOUT_COLUMN_FLOW:
      case ITEM_LAYOUT_GRID_FLOW:
      case ITEM_LAYOUT_SPLIT:
      case ITEM_LAYOUT_ABSOLUTE:
      case ITEM_LAYOUT_BOX:
      default:
        return UI_LAYOUT_VERTICAL;
    }
  }
  
  static uiLayout *ui_item_local_sublayout(uiLayout *test, uiLayout *layout, bool align)
  {
    uiLayout *sub;
  
    if (uiLayoutGetLocalDir(test) == UI_LAYOUT_HORIZONTAL) {
      sub = uiLayoutRow(layout, align);
    }
    else {
      sub = uiLayoutColumn(layout, align);
    }
  
    sub->space = 0;
    return sub;
  }
  
  static void ui_layer_but_cb(bContext *C, void *arg_but, void *arg_index)
  {
    wmWindow *win = CTX_wm_window(C);
    uiBut *but = arg_but, *cbut;
    PointerRNA *ptr = &but->rnapoin;
    PropertyRNA *prop = but->rnaprop;
    int i, index = POINTER_AS_INT(arg_index);
    int shift = win->eventstate->shift;
    int len = RNA_property_array_length(ptr, prop);
  
    if (!shift) {
      RNA_property_boolean_set_index(ptr, prop, index, true);
  
      for (i = 0; i < len; i++) {
        if (i != index) {
          RNA_property_boolean_set_index(ptr, prop, i, 0);
        }
      }
  
      RNA_property_update(C, ptr, prop);
  
      for (cbut = but->block->buttons.first; cbut; cbut = cbut->next) {
        ui_but_update(cbut);
      }
    }
  }
  
  /* create buttons for an item with an RNA array */
  static void ui_item_array(uiLayout *layout,
                            uiBlock *block,
                            const char *name,
                            int icon,
                            PointerRNA *ptr,
                            PropertyRNA *prop,
                            int len,
                            int x,
                            int y,
                            int w,
                            int UNUSED(h),
                            bool expand,
                            bool slider,
                            int toggle,
                            bool icon_only,
                            bool compact,
                            bool show_text)
  {
    const uiStyle *style = layout->root->style;
    uiBut *but;
    PropertyType type;
    PropertySubType subtype;
    uiLayout *sub;
    uint a, b;
  
    /* retrieve type and subtype */
    type = RNA_property_type(prop);
    subtype = RNA_property_subtype(prop);
  
    sub = ui_item_local_sublayout(layout, layout, 1);
    UI_block_layout_set_current(block, sub);
  
    /* create label */
    if (name[0] && show_text) {
      uiDefBut(block, UI_BTYPE_LABEL, 0, name, 0, 0, w, UI_UNIT_Y, NULL, 0.0, 0.0, 0, 0, "");
    }
  
    /* create buttons */
    if (type == PROP_BOOLEAN && ELEM(subtype, PROP_LAYER, PROP_LAYER_MEMBER)) {
      /* special check for layer layout */
      int butw, buth, unit;
      int cols = (len >= 20) ? 2 : 1;
      const uint colbuts = len / (2 * cols);
      uint layer_used = 0;
      uint layer_active = 0;
  
      UI_block_layout_set_current(block, uiLayoutAbsolute(layout, false));
  
      unit = UI_UNIT_X * 0.75;
      butw = unit;
      buth = unit;
  
      if (ptr->type == &RNA_Armature) {
        bArmature *arm = ptr->data;
  
        layer_used = arm->layer_used;
  
        if (arm->edbo) {
          if (arm->act_edbone) {
            layer_active |= arm->act_edbone->layer;
          }
        }
        else {
          if (arm->act_bone) {
            layer_active |= arm->act_bone->layer;
          }
        }
      }
  
      for (b = 0; b < cols; b++) {
        UI_block_align_begin(block);
  
        for (a = 0; a < colbuts; a++) {
          const int layer_num = a + b * colbuts;
          const uint layer_flag = (1u << layer_num);
  
          if (layer_used & layer_flag) {
            if (layer_active & layer_flag) {
              icon = ICON_LAYER_ACTIVE;
            }
            else {
              icon = ICON_LAYER_USED;
            }
          }
          else {
            icon = ICON_BLANK1;
          }
  
          but = uiDefAutoButR(
              block, ptr, prop, layer_num, "", icon, x + butw * a, y + buth, butw, buth);
          if (subtype == PROP_LAYER_MEMBER) {
            UI_but_func_set(but, ui_layer_but_cb, but, POINTER_FROM_INT(layer_num));
          }
        }
        for (a = 0; a < colbuts; a++) {
          const int layer_num = a + len / 2 + b * colbuts;
          const uint layer_flag = (1u << layer_num);
  
          if (layer_used & layer_flag) {
            if (layer_active & layer_flag) {
              icon = ICON_LAYER_ACTIVE;
            }
            else {
              icon = ICON_LAYER_USED;
            }
          }
          else {
            icon = ICON_BLANK1;
          }
  
          but = uiDefAutoButR(block, ptr, prop, layer_num, "", icon, x + butw * a, y, butw, buth);
          if (subtype == PROP_LAYER_MEMBER) {
            UI_but_func_set(but, ui_layer_but_cb, but, POINTER_FROM_INT(layer_num));
          }
        }
        UI_block_align_end(block);
  
        x += colbuts * butw + style->buttonspacex;
      }
    }
    else if (subtype == PROP_MATRIX) {
      int totdim, dim_size[3]; /* 3 == RNA_MAX_ARRAY_DIMENSION */
      int row, col;
  
      UI_block_layout_set_current(block, uiLayoutAbsolute(layout, true));
  
      totdim = RNA_property_array_dimension(ptr, prop, dim_size);
      if (totdim != 2) {
        /* Only 2D matrices supported in UI so far. */
        return;
      }
  
      w /= dim_size[0];
      /* h /= dim_size[1]; */ /* UNUSED */
  
      for (a = 0; a < len; a++) {
        col = a % dim_size[0];
        row = a / dim_size[0];
  
        but = uiDefAutoButR(block,
                            ptr,
                            prop,
                            a,
                            "",
                            ICON_NONE,
                            x + w * col,
                            y + (dim_size[1] * UI_UNIT_Y) - (row * UI_UNIT_Y),
                            w,
                            UI_UNIT_Y);
        if (slider && but->type == UI_BTYPE_NUM) {
          but->type = UI_BTYPE_NUM_SLIDER;
        }
      }
    }
    else if (subtype == PROP_DIRECTION && !expand) {
      uiDefButR_prop(block,
                     UI_BTYPE_UNITVEC,
                     0,
                     name,
                     x,
                     y,
                     UI_UNIT_X * 3,
                     UI_UNIT_Y * 3,
                     ptr,
                     prop,
                     -1,
                     0,
                     0,
                     -1,
                     -1,
                     NULL);
    }
    else {
      /* note, this block of code is a bit arbitrary and has just been made
       * to work with common cases, but may need to be re-worked */
  
      /* special case, boolean array in a menu, this could be used in a more generic way too */
      if (ELEM(subtype, PROP_COLOR, PROP_COLOR_GAMMA) && !expand && ELEM(len, 3, 4)) {
        uiDefAutoButR(block, ptr, prop, -1, "", ICON_NONE, 0, 0, w, UI_UNIT_Y);
      }
      else {
        bool *boolarr = NULL;
  
        /* even if 'expand' is fale, expanding anyway */
  
        /* layout for known array subtypes */
        char str[3] = {'\0'};
  
        if (!icon_only && show_text) {
          if (type != PROP_BOOLEAN) {
            str[1] = ':';
          }
        }
  
        /* show checkboxes for rna on a non-emboss block (menu for eg) */
        if (type == PROP_BOOLEAN &&
            ELEM(layout->root->block->dt, UI_EMBOSS_NONE, UI_EMBOSS_PULLDOWN)) {
          boolarr = MEM_callocN(sizeof(bool) * len, __func__);
          RNA_property_boolean_get_array(ptr, prop, boolarr);
        }
  
        const char *str_buf = show_text ? str : "";
        for (a = 0; a < len; a++) {
          int width_item;
  
          if (!icon_only && show_text) {
            str[0] = RNA_property_array_item_char(prop, a);
          }
          if (boolarr) {
            icon = boolarr[a] ? ICON_CHECKBOX_HLT : ICON_CHECKBOX_DEHLT;
          }
  
          width_item = ((compact && type == PROP_BOOLEAN) ?
                            min_ii(w, ui_text_icon_width(layout, str_buf, icon, false)) :
                            w);
  
          but = uiDefAutoButR(block, ptr, prop, a, str_buf, icon, 0, 0, width_item, UI_UNIT_Y);
          if (slider && but->type == UI_BTYPE_NUM) {
            but->type = UI_BTYPE_NUM_SLIDER;
          }
          if ((toggle == 1) && but->type == UI_BTYPE_CHECKBOX) {
            but->type = UI_BTYPE_TOGGLE;
          }
          if ((a == 0) && (subtype == PROP_AXISANGLE)) {
            UI_but_unit_type_set(but, PROP_UNIT_ROTATION);
          }
        }
  
        if (boolarr) {
          MEM_freeN(boolarr);
        }
      }
    }
  
    UI_block_layout_set_current(block, layout);
  }
  
  static void ui_item_enum_expand_handle(bContext *C, void *arg1, void *arg2)
  {
    wmWindow *win = CTX_wm_window(C);
  
    if (!win->eventstate->shift) {
      uiBut *but = (uiBut *)arg1;
      int enum_value = POINTER_AS_INT(arg2);
  
      int current_value = RNA_property_enum_get(&but->rnapoin, but->rnaprop);
      if (!(current_value & enum_value)) {
        current_value = enum_value;
      }
      else {
        current_value &= enum_value;
      }
      RNA_property_enum_set(&but->rnapoin, but->rnaprop, current_value);
    }
  }
  
  /**
   * Draw a single enum button, a utility for #ui_item_enum_expand_exec
   */
  static void ui_item_enum_expand_elem_exec(uiLayout *layout,
                                            uiBlock *block,
                                            PointerRNA *ptr,
                                            PropertyRNA *prop,
                                            const char *uiname,
                                            const int h,
                                            const eButType but_type,
                                            const bool icon_only,
                                            const EnumPropertyItem *item,
                                            const bool is_first)
  {
    const char *name = (!uiname || uiname[0]) ? item->name : "";
    const int icon = item->icon;
    const int value = item->value;
    const int itemw = ui_text_icon_width(block->curlayout, icon_only ? "" : name, icon, 0);
  
    uiBut *but;
  
    if (icon && name[0] && !icon_only) {
      but = uiDefIconTextButR_prop(
          block, but_type, 0, icon, name, 0, 0, itemw, h, ptr, prop, -1, 0, value, -1, -1, NULL);
    }
    else if (icon) {
      const int w = (is_first) ? itemw : ceilf(itemw - U.pixelsize);
      but = uiDefIconButR_prop(
          block, but_type, 0, icon, 0, 0, w, h, ptr, prop, -1, 0, value, -1, -1, NULL);
    }
    else {
      but = uiDefButR_prop(
          block, but_type, 0, name, 0, 0, itemw, h, ptr, prop, -1, 0, value, -1, -1, NULL);
    }
  
    if (RNA_property_flag(prop) & PROP_ENUM_FLAG) {
      /* If this is set, assert since we're clobbering someone elses callback. */
      /* Buttons get their block's func by default, so we cannot assert in that case either. */
      BLI_assert(ELEM(but->func, NULL, block->func));
      UI_but_func_set(but, ui_item_enum_expand_handle, but, POINTER_FROM_INT(value));
    }
  
    if (uiLayoutGetLocalDir(layout) != UI_LAYOUT_HORIZONTAL) {
      but->drawflag |= UI_BUT_TEXT_LEFT;
    }
  
    /* Allow quick, inaccurate swipe motions to switch tabs
     * (no need to keep cursor over them). */
    if (but_type == UI_BTYPE_TAB) {
      but->flag |= UI_BUT_DRAG_LOCK;
    }
  }
  
  static void ui_item_enum_expand_exec(uiLayout *layout,
                                       uiBlock *block,
                                       PointerRNA *ptr,
                                       PropertyRNA *prop,
                                       const char *uiname,
                                       const int h,
                                       const eButType but_type,
                                       const bool icon_only)
  {
    /* XXX: The way this function currently handles uiname parameter
     * is insane and inconsistent with general UI API:
     *
     * - uiname is the *enum property* label.
     * - when it is NULL or empty, we do not draw *enum items* labels,
     *   this doubles the icon_only parameter.
     * - we *never* draw (i.e. really use) the enum label uiname, it is just used as a mere flag!
     *
     * Unfortunately, fixing this implies an API "soft break", so better to defer it for later... :/
     * - mont29
     */
  
    const EnumPropertyItem *item, *item_array;
    bool free;
  
    BLI_assert(RNA_property_type(prop) == PROP_ENUM);
  
    uiLayout *layout_radial = NULL;
    bool radial = (layout->root->type == UI_LAYOUT_PIEMENU);
    if (radial) {
      RNA_property_enum_items_gettexted_all(block->evil_C, ptr, prop, &item_array, NULL, &free);
    }
    else {
      RNA_property_enum_items_gettexted(block->evil_C, ptr, prop, &item_array, NULL, &free);
    }
  
    /* we dont want nested rows, cols in menus */
    if (radial) {
      if (layout->root->layout == layout) {
        layout_radial = uiLayoutRadial(layout);
        UI_block_layout_set_current(block, layout_radial);
      }
      else {
        if (layout->item.type == ITEM_LAYOUT_RADIAL) {
          layout_radial = layout;
        }
        UI_block_layout_set_current(block, layout);
      }
    }
    else if (ELEM(layout->item.type, ITEM_LAYOUT_GRID_FLOW, ITEM_LAYOUT_COLUMN_FLOW) ||
             layout->root->type == UI_LAYOUT_MENU) {
      UI_block_layout_set_current(block, layout);
    }
    else {
      UI_block_layout_set_current(block, ui_item_local_sublayout(layout, layout, 1));
    }
  
    for (item = item_array; item->identifier; item++) {
      const bool is_first = item == item_array;
  
      if (!item->identifier[0]) {
        const EnumPropertyItem *next_item = item + 1;
  
        /* Separate items, potentially with a label. */
        if (next_item->identifier) {
          /* Item without identifier but with name:
           * Add group label for the following items. */
          if (item->name) {
            if (!is_first) {
              uiItemS(block->curlayout);
            }
            uiItemL(block->curlayout, item->name, item->icon);
          }
          else if (radial && layout_radial) {
            uiItemS(layout_radial);
          }
          else {
            uiItemS(block->curlayout);
          }
        }
        continue;
      }
  
      ui_item_enum_expand_elem_exec(
          layout, block, ptr, prop, uiname, h, but_type, icon_only, item, is_first);
    }
  
    UI_block_layout_set_current(block, layout);
  
    if (free) {
      MEM_freeN((void *)item_array);
    }
  }
  static void ui_item_enum_expand(uiLayout *layout,
                                  uiBlock *block,
                                  PointerRNA *ptr,
                                  PropertyRNA *prop,
                                  const char *uiname,
                                  const int h,
                                  const bool icon_only)
  {
    ui_item_enum_expand_exec(layout, block, ptr, prop, uiname, h, UI_BTYPE_ROW, icon_only);
  }
  static void ui_item_enum_expand_tabs(uiLayout *layout,
                                       bContext *C,
                                       uiBlock *block,
                                       PointerRNA *ptr,
                                       PropertyRNA *prop,
                                       const char *uiname,
                                       const int h,
                                       const bool icon_only)
  {
    uiBut *last = block->buttons.last;
  
    ui_item_enum_expand_exec(layout, block, ptr, prop, uiname, h, UI_BTYPE_TAB, icon_only);
    BLI_assert(last != block->buttons.last);
    for (uiBut *tab = last ? last->next : block->buttons.first; tab; tab = tab->next) {
      UI_but_drawflag_enable(tab, ui_but_align_opposite_to_area_align_get(CTX_wm_region(C)));
    }
  }
  
  /* callback for keymap item change button */
  static void ui_keymap_but_cb(bContext *UNUSED(C), void *but_v, void *UNUSED(key_v))
  {
    uiBut *but = but_v;
  
    RNA_boolean_set(&but->rnapoin, "shift", (but->modifier_key & KM_SHIFT) != 0);
    RNA_boolean_set(&but->rnapoin, "ctrl", (but->modifier_key & KM_CTRL) != 0);
    RNA_boolean_set(&but->rnapoin, "alt", (but->modifier_key & KM_ALT) != 0);
    RNA_boolean_set(&but->rnapoin, "oskey", (but->modifier_key & KM_OSKEY) != 0);
  }
  
  /**
   * Create label + button for RNA property
   *
   * \param w_hint: For varying width layout, this becomes the label width.
   *                Otherwise it's used to fit both items into it.
   */
  static uiBut *ui_item_with_label(uiLayout *layout,
                                   uiBlock *block,
                                   const char *name,
                                   int icon,
                                   PointerRNA *ptr,
                                   PropertyRNA *prop,
                                   int index,
                                   int x,
                                   int y,
                                   int w_hint,
                                   int h,
                                   int flag)
  {
    uiLayout *sub;
    uiBut *but = NULL;
    PropertyType type;
    PropertySubType subtype;
    int prop_but_width = w_hint;
  #ifdef UI_PROP_DECORATE
    uiLayout *layout_prop_decorate = NULL;
    const bool use_prop_sep = ((layout->item.flag & UI_ITEM_PROP_SEP) != 0);
  #endif
  
    /* Always align item with label since text is already given enough space not to overlap. */
    sub = uiLayoutRow(layout, true);
    UI_block_layout_set_current(block, sub);
  
  #ifdef UI_PROP_DECORATE
    if (name[0]) {
      if (use_prop_sep) {
        layout_prop_decorate = uiItemL_respect_property_split(layout, name, 0);
      }
      else
  #endif
      {
        int w_label;
  
        if (ui_layout_variable_size(layout)) {
          /* w_hint is width for label in this case.
           * Use a default width for property button(s) */
          prop_but_width = UI_UNIT_X * 5;
          w_label = w_hint;
        }
        else {
          w_label = w_hint / 3;
        }
        uiDefBut(block, UI_BTYPE_LABEL, 0, name, x, y, w_label, h, NULL, 0.0, 0.0, 0, 0, "");
      }
    }
  
    type = RNA_property_type(prop);
    subtype = RNA_property_subtype(prop);
  
    if (subtype == PROP_FILEPATH || subtype == PROP_DIRPATH) {
      UI_block_layout_set_current(block, uiLayoutRow(sub, true));
      but = uiDefAutoButR(block, ptr, prop, index, "", icon, x, y, prop_but_width - UI_UNIT_X, h);
  
      /* BUTTONS_OT_file_browse calls UI_context_active_but_prop_get_filebrowser */
      uiDefIconButO(block,
                    UI_BTYPE_BUT,
                    subtype == PROP_DIRPATH ? "BUTTONS_OT_directory_browse" :
                                              "BUTTONS_OT_file_browse",
                    WM_OP_INVOKE_DEFAULT,
                    ICON_FILEBROWSER,
                    x,
                    y,
                    UI_UNIT_X,
                    h,
                    NULL);
    }
    else if (flag & UI_ITEM_R_EVENT) {
      but = uiDefButR_prop(block,
                           UI_BTYPE_KEY_EVENT,
                           0,
                           name,
                           x,
                           y,
                           prop_but_width,
                           h,
                           ptr,
                           prop,
                           index,
                           0,
                           0,
                           -1,
                           -1,
                           NULL);
    }
    else if (flag & UI_ITEM_R_FULL_EVENT) {
      if (RNA_struct_is_a(ptr->type, &RNA_KeyMapItem)) {
        char buf[128];
  
        WM_keymap_item_to_string(ptr->data, false, buf, sizeof(buf));
  
        but = uiDefButR_prop(block,
                             UI_BTYPE_HOTKEY_EVENT,
                             0,
                             buf,
                             x,
                             y,
                             prop_but_width,
                             h,
                             ptr,
                             prop,
                             0,
                             0,
                             0,
                             -1,
                             -1,
                             NULL);
        UI_but_func_set(but, ui_keymap_but_cb, but, NULL);
        if (flag & UI_ITEM_R_IMMEDIATE) {
          UI_but_flag_enable(but, UI_BUT_IMMEDIATE);
        }
      }
    }
    else {
      const char *str = (type == PROP_ENUM && !(flag & UI_ITEM_R_ICON_ONLY)) ? NULL : "";
      but = uiDefAutoButR(block, ptr, prop, index, str, icon, x, y, prop_but_width, h);
    }
  
  #ifdef UI_PROP_DECORATE
    /* Only for alignment. */
    if (layout->item.flag & UI_ITEM_PROP_SEP) {
      if ((layout->item.flag & UI_ITEM_PROP_DECORATE) &&
          (layout->item.flag & UI_ITEM_PROP_DECORATE_NO_PAD) == 0) {
        uiItemL(layout_prop_decorate ? layout_prop_decorate : sub, NULL, ICON_BLANK1);
      }
    }
  #endif /* UI_PROP_DECORATE */
  
    UI_block_layout_set_current(block, layout);
    return but;
  }
  
  void UI_context_active_but_prop_get_filebrowser(const bContext *C,
                                                  PointerRNA *r_ptr,
                                                  PropertyRNA **r_prop,
                                                  bool *r_is_undo)
  {
    ARegion *region = CTX_wm_menu(C) ? CTX_wm_menu(C) : CTX_wm_region(C);
    uiBlock *block;
    uiBut *but, *prevbut = NULL;
  
    memset(r_ptr, 0, sizeof(*r_ptr));
    *r_prop = NULL;
    *r_is_undo = false;
  
    if (!region) {
      return;
    }
  
    for (block = region->uiblocks.first; block; block = block->next) {
      for (but = block->buttons.first; but; but = but->next) {
        if (but && but->rnapoin.data) {
          if (RNA_property_type(but->rnaprop) == PROP_STRING) {
            prevbut = but;
          }
        }
  
        /* find the button before the active one */
        if ((but->flag & UI_BUT_LAST_ACTIVE) && prevbut) {
          *r_ptr = prevbut->rnapoin;
          *r_prop = prevbut->rnaprop;
          *r_is_undo = (prevbut->flag & UI_BUT_UNDO) != 0;
          return;
        }
      }
    }
  }
  
  /** \} */
  
  /* -------------------------------------------------------------------- */
  /** \name Button Items
   * \{ */
  
  /**
   * Update a buttons tip with an enum's description if possible.
   */
  static void ui_but_tip_from_enum_item(uiBut *but, const EnumPropertyItem *item)
  {
    if (but->tip == NULL || but->tip[0] == '\0') {
      if (item->description && item->description[0] &&
          !(but->optype && but->optype->get_description)) {
        but->tip = item->description;
      }
    }
  }
  
  /* disabled item */
  static void ui_item_disabled(uiLayout *layout, const char *name)
  {
    uiBlock *block = layout->root->block;
    uiBut *but;
    int w;
  
    UI_block_layout_set_current(block, layout);
  
    if (!name) {
      name = "";
    }
  
    w = ui_text_icon_width(layout, name, 0, 0);
  
    but = uiDefBut(block, UI_BTYPE_LABEL, 0, name, 0, 0, w, UI_UNIT_Y, NULL, 0.0, 0.0, 0, 0, "");
    but->flag |= UI_BUT_DISABLED;
    but->disabled_info = "";
  }
  
  /**
   * Operator Item
   * \param r_opptr: Optional, initialize with operator properties when not NULL.
   * Will always be written to even in the case of errors.
   */
  static uiBut *uiItemFullO_ptr_ex(uiLayout *layout,
                                   wmOperatorType *ot,
                                   const char *name,
                                   int icon,
                                   IDProperty *properties,
                                   int context,
                                   int flag,
                                   PointerRNA *r_opptr)
  {
    /* Take care to fill 'r_opptr' whatever happens. */
    uiBlock *block = layout->root->block;
    uiBut *but;
    int w;
  
    if (!name) {
      if (ot && ot->srna && (flag & UI_ITEM_R_ICON_ONLY) == 0) {
        name = WM_operatortype_name(ot, NULL);
      }
      else {
        name = "";
      }
    }
  
    if (layout->root->type == UI_LAYOUT_MENU && !icon) {
      icon = ICON_BLANK1;
    }
  
    /* create button */
    UI_block_layout_set_current(block, layout);
  
    w = ui_text_icon_width(layout, name, icon, 0);
  
    int prev_emboss = layout->emboss;
    if (flag & UI_ITEM_R_NO_BG) {
      layout->emboss = UI_EMBOSS_NONE;
    }
  
    /* create the button */
    if (icon) {
      if (name[0]) {
        but = uiDefIconTextButO_ptr(
            block, UI_BTYPE_BUT, ot, context, icon, name, 0, 0, w, UI_UNIT_Y, NULL);
      }
      else {
        but = uiDefIconButO_ptr(block, UI_BTYPE_BUT, ot, context, icon, 0, 0, w, UI_UNIT_Y, NULL);
      }
    }
    else {
      but = uiDefButO_ptr(block, UI_BTYPE_BUT, ot, context, name, 0, 0, w, UI_UNIT_Y, NULL);
    }
  
    assert(but->optype != NULL);
  
    if (flag & UI_ITEM_R_NO_BG) {
      layout->emboss = prev_emboss;
    }
  
    if (flag & UI_ITEM_O_DEPRESS) {
      but->flag |= UI_SELECT_DRAW;
    }
  
    if (layout->redalert) {
      UI_but_flag_enable(but, UI_BUT_REDALERT);
    }
  
    if (layout->active_default) {
      UI_but_flag_enable(but, UI_BUT_ACTIVE_DEFAULT);
    }
  
    /* assign properties */
    if (properties || r_opptr) {
      PointerRNA *opptr = UI_but_operator_ptr_get(but);
      if (properties) {
        opptr->data = properties;
      }
      else {
        IDPropertyTemplate val = {0};
        opptr->data = IDP_New(IDP_GROUP, &val, "wmOperatorProperties");
      }
      if (r_opptr) {
        *r_opptr = *opptr;
      }
    }
  
    return but;
  }
  
  static void ui_item_menu_hold(struct bContext *C, ARegion *butregion, uiBut *but)
  {
    uiPopupMenu *pup = UI_popup_menu_begin(C, "", ICON_NONE);
    uiLayout *layout = UI_popup_menu_layout(pup);
    uiBlock *block = layout->root->block;
    UI_popup_menu_but_set(pup, butregion, but);
  
    block->flag |= UI_BLOCK_POPUP_HOLD;
    block->flag |= UI_BLOCK_IS_FLIP;
  
    char direction = UI_DIR_DOWN;
    if (!but->drawstr[0]) {
      switch (RGN_ALIGN_ENUM_FROM_MASK(butregion->alignment)) {
        case RGN_ALIGN_LEFT:
          direction = UI_DIR_RIGHT;
          break;
        case RGN_ALIGN_RIGHT:
          direction = UI_DIR_LEFT;
          break;
        case RGN_ALIGN_BOTTOM:
          direction = UI_DIR_UP;
          break;
        default:
          direction = UI_DIR_DOWN;
          break;
      }
    }
    UI_block_direction_set(block, direction);
  
    const char *menu_id = but->hold_argN;
    MenuType *mt = WM_menutype_find(menu_id, true);
    if (mt) {
      uiLayoutSetContextFromBut(layout, but);
      UI_menutype_draw(C, mt, layout);
    }
    else {
      uiItemL(layout, "Menu Missing:", ICON_NONE);
      uiItemL(layout, menu_id, ICON_NONE);
    }
    UI_popup_menu_end(C, pup);
  }
  
  void uiItemFullO_ptr(uiLayout *layout,
                       wmOperatorType *ot,
                       const char *name,
                       int icon,
                       IDProperty *properties,
                       int context,
                       int flag,
                       PointerRNA *r_opptr)
  {
    uiItemFullO_ptr_ex(layout, ot, name, icon, properties, context, flag, r_opptr);
  }
  
  void uiItemFullOMenuHold_ptr(uiLayout *layout,
                               wmOperatorType *ot,
                               const char *name,
                               int icon,
                               IDProperty *properties,
                               int context,
                               int flag,
                               const char *menu_id,
                               PointerRNA *r_opptr)
  {
    uiBut *but = uiItemFullO_ptr_ex(layout, ot, name, icon, properties, context, flag, r_opptr);
    UI_but_func_hold_set(but, ui_item_menu_hold, BLI_strdup(menu_id));
  }
  
  void uiItemFullO(uiLayout *layout,
                   const char *opname,
                   const char *name,
                   int icon,
                   IDProperty *properties,
                   int context,
                   int flag,
                   PointerRNA *r_opptr)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
  
    UI_OPERATOR_ERROR_RET(ot, opname, {
      if (r_opptr) {
        *r_opptr = PointerRNA_NULL;
      }
      return;
    });
  
    uiItemFullO_ptr(layout, ot, name, icon, properties, context, flag, r_opptr);
  }
  
  static const char *ui_menu_enumpropname(uiLayout *layout,
                                          PointerRNA *ptr,
                                          PropertyRNA *prop,
                                          int retval)
  {
    const EnumPropertyItem *item;
    bool free;
    const char *name;
  
    RNA_property_enum_items(layout->root->block->evil_C, ptr, prop, &item, NULL, &free);
    if (RNA_enum_name(item, retval, &name)) {
      name = CTX_IFACE_(RNA_property_translation_context(prop), name);
    }
    else {
      name = "";
    }
  
    if (free) {
      MEM_freeN((void *)item);
    }
  
    return name;
  }
  
  void uiItemEnumO_ptr(uiLayout *layout,
                       wmOperatorType *ot,
                       const char *name,
                       int icon,
                       const char *propname,
                       int value)
  {
    PointerRNA ptr;
    PropertyRNA *prop;
  
    WM_operator_properties_create_ptr(&ptr, ot);
  
    if ((prop = RNA_struct_find_property(&ptr, propname))) {
      /* pass */
    }
    else {
      RNA_warning("%s.%s not found", RNA_struct_identifier(ptr.type), propname);
      return;
    }
  
    RNA_property_enum_set(&ptr, prop, value);
  
    if (!name) {
      name = ui_menu_enumpropname(layout, &ptr, prop, value);
    }
  
    uiItemFullO_ptr(layout, ot, name, icon, ptr.data, layout->root->opcontext, 0, NULL);
  }
  void uiItemEnumO(uiLayout *layout,
                   const char *opname,
                   const char *name,
                   int icon,
                   const char *propname,
                   int value)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
  
    if (ot) {
      uiItemEnumO_ptr(layout, ot, name, icon, propname, value);
    }
    else {
      ui_item_disabled(layout, opname);
      RNA_warning("unknown operator '%s'", opname);
    }
  }
  
  BLI_INLINE bool ui_layout_is_radial(const uiLayout *layout)
  {
    return (layout->item.type == ITEM_LAYOUT_RADIAL) ||
           ((layout->item.type == ITEM_LAYOUT_ROOT) && (layout->root->type == UI_LAYOUT_PIEMENU));
  }
  
  /**
   * Create ui items for enum items in \a item_array.
   *
   * A version of #uiItemsFullEnumO that takes pre-calculated item array.
   */
  void uiItemsFullEnumO_items(uiLayout *layout,
                              wmOperatorType *ot,
                              PointerRNA ptr,
                              PropertyRNA *prop,
                              IDProperty *properties,
                              int context,
                              int flag,
                              const EnumPropertyItem *item_array,
                              int totitem)
  {
    const char *propname = RNA_property_identifier(prop);
    if (RNA_property_type(prop) != PROP_ENUM) {
      RNA_warning("%s.%s, not an enum type", RNA_struct_identifier(ptr.type), propname);
      return;
    }
  
    uiLayout *target, *split = NULL;
    const EnumPropertyItem *item;
    uiBlock *block = layout->root->block;
    const bool radial = ui_layout_is_radial(layout);
  
    if (radial) {
      target = uiLayoutRadial(layout);
    }
    else {
      split = uiLayoutSplit(layout, 0.0f, false);
      target = uiLayoutColumn(split, layout->align);
    }
  
    int i;
    bool last_iter = false;
  
    for (i = 1, item = item_array; item->identifier && !last_iter; i++, item++) {
      /* handle oversized pies */
      if (radial && (totitem > PIE_MAX_ITEMS) && (i >= PIE_MAX_ITEMS)) {
        if (item->name) { /* only visible items */
          const EnumPropertyItem *tmp;
  
          /* Check if there are more visible items for the next level. If not, we don't
           * add a new level and add the remaining item instead of the 'more' button. */
          for (tmp = item + 1; tmp->identifier; tmp++) {
            if (tmp->name) {
              break;
            }
          }
  
          if (tmp->identifier) { /* only true if loop above found item and did early-exit */
            ui_pie_menu_level_create(
                block, ot, propname, properties, item_array, totitem, context, flag);
            /* break since rest of items is handled in new pie level */
            break;
          }
          else {
            last_iter = true;
          }
        }
        else {
          continue;
        }
      }
  
      if (item->identifier[0]) {
        PointerRNA tptr;
  
        WM_operator_properties_create_ptr(&tptr, ot);
        if (properties) {
          if (tptr.data) {
            IDP_FreeProperty(tptr.data);
          }
          tptr.data = IDP_CopyProperty(properties);
        }
        RNA_property_enum_set(&tptr, prop, item->value);
  
        uiItemFullO_ptr(target, ot, item->name, item->icon, tptr.data, context, flag, NULL);
  
        ui_but_tip_from_enum_item(block->buttons.last, item);
      }
      else {
        if (item->name) {
          uiBut *but;
  
          if (item != item_array && !radial) {
            target = uiLayoutColumn(split, layout->align);
  
            /* inconsistent, but menus with labels do not look good flipped */
            block->flag |= UI_BLOCK_NO_FLIP;
          }
  
          if (item->icon || radial) {
            uiItemL(target, item->name, item->icon);
  
            but = block->buttons.last;
          }
          else {
            /* Do not use uiItemL here, as our root layout is a menu one,
             * it will add a fake blank icon! */
            but = uiDefBut(block,
                           UI_BTYPE_LABEL,
                           0,
                           item->name,
                           0,
                           0,
                           UI_UNIT_X * 5,
                           UI_UNIT_Y,
                           NULL,
                           0.0,
                           0.0,
                           0,
                           0,
                           "");
          }
          ui_but_tip_from_enum_item(but, item);
        }
        else {
          if (radial) {
            /* invisible dummy button to ensure all items are
             * always at the same position */
            uiItemS(target);
          }
          else {
            /* XXX bug here, columns draw bottom item badly */
            uiItemS(target);
          }
        }
      }
    }
  }
  
  void uiItemsFullEnumO(uiLayout *layout,
                        const char *opname,
                        const char *propname,
                        IDProperty *properties,
                        int context,
                        int flag)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
  
    PointerRNA ptr;
    PropertyRNA *prop;
    uiBlock *block = layout->root->block;
  
    if (!ot || !ot->srna) {
      ui_item_disabled(layout, opname);
      RNA_warning("%s '%s'", ot ? "unknown operator" : "operator missing srna", opname);
      return;
    }
  
    WM_operator_properties_create_ptr(&ptr, ot);
    /* so the context is passed to itemf functions (some need it) */
    WM_operator_properties_sanitize(&ptr, false);
    prop = RNA_struct_find_property(&ptr, propname);
  
    /* don't let bad properties slip through */
    BLI_assert((prop == NULL) || (RNA_property_type(prop) == PROP_ENUM));
  
    if (prop && RNA_property_type(prop) == PROP_ENUM) {
      const EnumPropertyItem *item_array = NULL;
      int totitem;
      bool free;
  
      if (ui_layout_is_radial(layout)) {
        /* XXX: While "_all()" guarantees spatial stability,
         * it's bad when an enum has > 8 items total,
         * but only a small subset will ever be shown at once
         * (e.g. Mode Switch menu, after the introduction of GP editing modes).
         */
  #if 0
        RNA_property_enum_items_gettexted_all(
            block->evil_C, &ptr, prop, &item_array, &totitem, &free);
  #else
        RNA_property_enum_items_gettexted(block->evil_C, &ptr, prop, &item_array, &totitem, &free);
  #endif
      }
      else {
        RNA_property_enum_items_gettexted(block->evil_C, &ptr, prop, &item_array, &totitem, &free);
      }
  
      /* add items */
      uiItemsFullEnumO_items(layout, ot, ptr, prop, properties, context, flag, item_array, totitem);
  
      if (free) {
        MEM_freeN((void *)item_array);
      }
  
      /* intentionally don't touch UI_BLOCK_IS_FLIP here,
       * we don't know the context this is called in */
    }
    else if (prop && RNA_property_type(prop) != PROP_ENUM) {
      RNA_warning("%s.%s, not an enum type", RNA_struct_identifier(ptr.type), propname);
      return;
    }
    else {
      RNA_warning("%s.%s not found", RNA_struct_identifier(ptr.type), propname);
      return;
    }
  }
  
  void uiItemsEnumO(uiLayout *layout, const char *opname, const char *propname)
  {
    uiItemsFullEnumO(layout, opname, propname, NULL, layout->root->opcontext, 0);
  }
  
  /* for use in cases where we have */
  void uiItemEnumO_value(uiLayout *layout,
                         const char *name,
                         int icon,
                         const char *opname,
                         const char *propname,
                         int value)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
    PointerRNA ptr;
    PropertyRNA *prop;
  
    UI_OPERATOR_ERROR_RET(ot, opname, return );
  
    WM_operator_properties_create_ptr(&ptr, ot);
  
    /* enum lookup */
    if ((prop = RNA_struct_find_property(&ptr, propname))) {
      /* pass */
    }
    else {
      RNA_warning("%s.%s not found", RNA_struct_identifier(ptr.type), propname);
      return;
    }
  
    RNA_property_enum_set(&ptr, prop, value);
  
    /* same as uiItemEnumO */
    if (!name) {
      name = ui_menu_enumpropname(layout, &ptr, prop, value);
    }
  
    uiItemFullO_ptr(layout, ot, name, icon, ptr.data, layout->root->opcontext, 0, NULL);
  }
  
  void uiItemEnumO_string(uiLayout *layout,
                          const char *name,
                          int icon,
                          const char *opname,
                          const char *propname,
                          const char *value_str)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
    PointerRNA ptr;
    PropertyRNA *prop;
  
    const EnumPropertyItem *item;
    int value;
    bool free;
  
    UI_OPERATOR_ERROR_RET(ot, opname, return );
  
    WM_operator_properties_create_ptr(&ptr, ot);
  
    /* enum lookup */
    if ((prop = RNA_struct_find_property(&ptr, propname))) {
      /* no need for translations here */
      RNA_property_enum_items(layout->root->block->evil_C, &ptr, prop, &item, NULL, &free);
      if (item == NULL || RNA_enum_value_from_id(item, value_str, &value) == 0) {
        if (free) {
          MEM_freeN((void *)item);
        }
        RNA_warning(
            "%s.%s, enum %s not found", RNA_struct_identifier(ptr.type), propname, value_str);
        return;
      }
  
      if (free) {
        MEM_freeN((void *)item);
      }
    }
    else {
      RNA_warning("%s.%s not found", RNA_struct_identifier(ptr.type), propname);
      return;
    }
  
    RNA_property_enum_set(&ptr, prop, value);
  
    /* same as uiItemEnumO */
    if (!name) {
      name = ui_menu_enumpropname(layout, &ptr, prop, value);
    }
  
    uiItemFullO_ptr(layout, ot, name, icon, ptr.data, layout->root->opcontext, 0, NULL);
  }
  
  void uiItemBooleanO(uiLayout *layout,
                      const char *name,
                      int icon,
                      const char *opname,
                      const char *propname,
                      int value)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
    PointerRNA ptr;
  
    UI_OPERATOR_ERROR_RET(ot, opname, return );
  
    WM_operator_properties_create_ptr(&ptr, ot);
    RNA_boolean_set(&ptr, propname, value);
  
    uiItemFullO_ptr(layout, ot, name, icon, ptr.data, layout->root->opcontext, 0, NULL);
  }
  
  void uiItemIntO(uiLayout *layout,
                  const char *name,
                  int icon,
                  const char *opname,
                  const char *propname,
                  int value)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
    PointerRNA ptr;
  
    UI_OPERATOR_ERROR_RET(ot, opname, return );
  
    WM_operator_properties_create_ptr(&ptr, ot);
    RNA_int_set(&ptr, propname, value);
  
    uiItemFullO_ptr(layout, ot, name, icon, ptr.data, layout->root->opcontext, 0, NULL);
  }
  
  void uiItemFloatO(uiLayout *layout,
                    const char *name,
                    int icon,
                    const char *opname,
                    const char *propname,
                    float value)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
    PointerRNA ptr;
  
    UI_OPERATOR_ERROR_RET(ot, opname, return );
  
    WM_operator_properties_create_ptr(&ptr, ot);
    RNA_float_set(&ptr, propname, value);
  
    uiItemFullO_ptr(layout, ot, name, icon, ptr.data, layout->root->opcontext, 0, NULL);
  }
  
  void uiItemStringO(uiLayout *layout,
                     const char *name,
                     int icon,
                     const char *opname,
                     const char *propname,
                     const char *value)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
    PointerRNA ptr;
  
    UI_OPERATOR_ERROR_RET(ot, opname, return );
  
    WM_operator_properties_create_ptr(&ptr, ot);
    RNA_string_set(&ptr, propname, value);
  
    uiItemFullO_ptr(layout, ot, name, icon, ptr.data, layout->root->opcontext, 0, NULL);
  }
  
  void uiItemO(uiLayout *layout, const char *name, int icon, const char *opname)
  {
    uiItemFullO(layout, opname, name, icon, NULL, layout->root->opcontext, 0, NULL);
  }
  
  /* RNA property items */
  
  static void ui_item_rna_size(uiLayout *layout,
                               const char *name,
                               int icon,
                               PointerRNA *ptr,
                               PropertyRNA *prop,
                               int index,
                               bool icon_only,
                               bool compact,
                               int *r_w,
                               int *r_h)
  {
    PropertyType type;
    PropertySubType subtype;
    int len, w = 0, h;
    bool is_checkbox_only = false;
  
    /* arbitrary extended width by type */
    type = RNA_property_type(prop);
    subtype = RNA_property_subtype(prop);
    len = RNA_property_array_length(ptr, prop);
  
    if (!name[0] && !icon_only) {
      if (ELEM(type, PROP_STRING, PROP_POINTER)) {
        name = "non-empty text";
      }
      else if (type == PROP_BOOLEAN) {
        if (icon == ICON_NONE) {
          /* Exception for checkboxes, they need a little less space to align nicely. */
          is_checkbox_only = true;
        }
        icon = ICON_DOT;
      }
      else if (type == PROP_ENUM) {
        /* Find the longest enum item name, instead of using a dummy text! */
        const EnumPropertyItem *item, *item_array;
        bool free;
  
        RNA_property_enum_items_gettexted(
            layout->root->block->evil_C, ptr, prop, &item_array, NULL, &free);
        for (item = item_array; item->identifier; item++) {
          if (item->identifier[0]) {
            w = max_ii(w, ui_text_icon_width(layout, item->name, item->icon, compact));
          }
        }
        if (free) {
          MEM_freeN((void *)item_array);
        }
      }
    }
  
    if (!w) {
      if (type == PROP_ENUM && icon_only) {
        w = ui_text_icon_width(layout, "", ICON_BLANK1, compact);
        if (index != RNA_ENUM_VALUE) {
          w += 0.6f * UI_UNIT_X;
        }
      }
      else {
        /* not compact for float/int buttons, looks too squashed */
        w = ui_text_icon_width(
            layout, name, icon, ELEM(type, PROP_FLOAT, PROP_INT) ? false : compact);
      }
    }
    h = UI_UNIT_Y;
  
    /* increase height for arrays */
    if (index == RNA_NO_INDEX && len > 0) {
      if (!name[0] && icon == ICON_NONE) {
        h = 0;
      }
      if (layout->item.flag & UI_ITEM_PROP_SEP) {
        h = 0;
      }
      if (ELEM(subtype, PROP_LAYER, PROP_LAYER_MEMBER)) {
        h += 2 * UI_UNIT_Y;
      }
      else if (subtype == PROP_MATRIX) {
        h += ceilf(sqrtf(len)) * UI_UNIT_Y;
      }
      else {
        h += len * UI_UNIT_Y;
      }
    }
  
    /* Increase width requirement if in a variable size layout. */
    if (ui_layout_variable_size(layout)) {
      if (type == PROP_BOOLEAN && name[0]) {
        w += UI_UNIT_X / 5;
      }
      else if (is_checkbox_only) {
        w -= UI_UNIT_X / 4;
      }
      else if (type == PROP_ENUM && !icon_only) {
        w += UI_UNIT_X / 4;
      }
      else if (type == PROP_FLOAT || type == PROP_INT) {
        w += UI_UNIT_X * 3;
      }
    }
  
    *r_w = w;
    *r_h = h;
  }
  
  static bool ui_item_rna_is_expand(PropertyRNA *prop, int index, int item_flag)
  {
    const bool is_array = RNA_property_array_check(prop);
    const int subtype = RNA_property_subtype(prop);
    return is_array && (index == RNA_NO_INDEX) &&
           ((item_flag & UI_ITEM_R_EXPAND) ||
            !ELEM(subtype, PROP_COLOR, PROP_COLOR_GAMMA, PROP_DIRECTION));
  }
  
  /**
   * Find first layout ancestor (or self) with a heading set.
   *
   * \returns the layout to add the heading to as fallback (i.e. if it can't be placed in a split
   *          layout). Its #uiLayout.heading member can be cleared to mark the heading as added (so
   *          it's not added multiple times). Returns a pointer to the heading
   */
  static uiLayout *ui_layout_heading_find(uiLayout *cur_layout)
  {
    for (uiLayout *parent = cur_layout; parent; parent = parent->parent) {
      if (parent->heading[0]) {
        return parent;
      }
    }
  
    return NULL;
  }
  
  static void ui_layout_heading_label_add(uiLayout *layout,
                                          uiLayout *heading_layout,
                                          bool right_align,
                                          bool respect_prop_split)
  {
    const int prev_alignment = layout->alignment;
  
    if (right_align) {
      uiLayoutSetAlignment(layout, UI_LAYOUT_ALIGN_RIGHT);
    }
  
    if (respect_prop_split) {
      uiItemL_respect_property_split(layout, heading_layout->heading, ICON_NONE);
    }
    else {
      uiItemL(layout, heading_layout->heading, ICON_NONE);
    }
    /* After adding the heading label, we have to mark it somehow as added, so it's not added again
     * for other items in this layout. For now just clear it. */
    heading_layout->heading[0] = '\0';
  
    layout->alignment = prev_alignment;
  }
  
  /**
   * Hack to add further items in a row into the second part of the split layout, so the label part
   * keeps a fixed size.
   * \return The layout to place further items in for the split layout.
   */
  static uiLayout *ui_item_prop_split_layout_hack(uiLayout *layout_parent, uiLayout *layout_split)
  {
    /* Tag item as using property split layout, this is inherited to children so they can get special
     * treatment if needed. */
    layout_parent->item.flag |= UI_ITEM_INSIDE_PROP_SEP;
  
    if (layout_parent->item.type == ITEM_LAYOUT_ROW) {
      /* Prevent further splits within the row. */
      uiLayoutSetPropSep(layout_parent, false);
  
      layout_parent->child_items_layout = uiLayoutRow(layout_split, true);
      return layout_parent->child_items_layout;
    }
    return layout_split;
  }
  
  void uiItemFullR(uiLayout *layout,
                   PointerRNA *ptr,
                   PropertyRNA *prop,
                   int index,
                   int value,
                   int flag,
                   const char *name,
                   int icon)
  {
    uiBlock *block = layout->root->block;
    char namestr[UI_MAX_NAME_STR];
    const bool use_prop_sep = ((layout->item.flag & UI_ITEM_PROP_SEP) != 0);
    const bool inside_prop_sep = ((layout->item.flag & UI_ITEM_INSIDE_PROP_SEP) != 0);
    /* Columns can define a heading to insert. If the first item added to a split layout doesn't have
     * a label to display in the first column, the heading is inserted there. Otherwise it's inserted
     * as a new row before the first item. */
    uiLayout *heading_layout = ui_layout_heading_find(layout);
    /* Although checkboxes use the split layout, they are an exception and should only place their
     * label in the second column, to not make that almost empty.
     *
     * Keep using 'use_prop_sep' instead of disabling it entirely because
     * we need the ability to have decorators still. */
    bool use_prop_sep_split_label = use_prop_sep;
    bool use_split_empty_name = (flag & UI_ITEM_R_SPLIT_EMPTY_NAME);
  
  #ifdef UI_PROP_DECORATE
    struct {
      bool use_prop_decorate;
      int len;
      uiLayout *layout;
      uiBut *but;
    } ui_decorate = {
        .use_prop_decorate = (((layout->item.flag & UI_ITEM_PROP_DECORATE) != 0) &&
                              (use_prop_sep && ptr->owner_id &&
                               id_can_have_animdata(ptr->owner_id))),
    };
  #endif /* UI_PROP_DECORATE */
  
    UI_block_layout_set_current(block, layout);
  
    /* retrieve info */
    const PropertyType type = RNA_property_type(prop);
    const bool is_array = RNA_property_array_check(prop);
    const int len = (is_array) ? RNA_property_array_length(ptr, prop) : 0;
  
    const bool icon_only = (flag & UI_ITEM_R_ICON_ONLY) != 0;
  
    /* Boolean with -1 to signify that the value depends on the presence of an icon. */
    const int toggle = ((flag & UI_ITEM_R_TOGGLE) ? 1 : ((flag & UI_ITEM_R_ICON_NEVER) ? 0 : -1));
    const bool no_icon = (toggle == 0);
  
    /* set name and icon */
    if (!name) {
      if (!icon_only) {
        name = RNA_property_ui_name(prop);
      }
      else {
        name = "";
      }
    }
  
    if (type != PROP_BOOLEAN) {
      flag &= ~UI_ITEM_R_CHECKBOX_INVERT;
    }
  
    if (flag & UI_ITEM_R_ICON_ONLY) {
      /* pass */
    }
    else if (ELEM(type, PROP_INT, PROP_FLOAT, PROP_STRING, PROP_POINTER)) {
      if (use_prop_sep == false) {
        name = ui_item_name_add_colon(name, namestr);
      }
    }
    else if (type == PROP_BOOLEAN && is_array && index == RNA_NO_INDEX) {
      if (use_prop_sep == false) {
        name = ui_item_name_add_colon(name, namestr);
      }
    }
    else if (type == PROP_ENUM && index != RNA_ENUM_VALUE) {
      if (flag & UI_ITEM_R_COMPACT) {
        name = "";
      }
      else {
        if (use_prop_sep == false) {
          name = ui_item_name_add_colon(name, namestr);
        }
      }
    }
  
    if (no_icon == false) {
      if (icon == ICON_NONE) {
        icon = RNA_property_ui_icon(prop);
      }
  
      /* Menus and pie-menus don't show checkbox without this. */
      if ((layout->root->type == UI_LAYOUT_MENU) ||
          /* Use checkboxes only as a fallback in pie-menu's, when no icon is defined. */
          ((layout->root->type == UI_LAYOUT_PIEMENU) && (icon == ICON_NONE))) {
        int prop_flag = RNA_property_flag(prop);
        if (type == PROP_BOOLEAN) {
          if ((is_array == false) || (index != RNA_NO_INDEX)) {
            if (prop_flag & PROP_ICONS_CONSECUTIVE) {
              icon = ICON_CHECKBOX_DEHLT; /* but->iconadd will set to correct icon */
            }
            else if (is_array) {
              icon = (RNA_property_boolean_get_index(ptr, prop, index)) ? ICON_CHECKBOX_HLT :
                                                                          ICON_CHECKBOX_DEHLT;
            }
            else {
              icon = (RNA_property_boolean_get(ptr, prop)) ? ICON_CHECKBOX_HLT : ICON_CHECKBOX_DEHLT;
            }
          }
        }
        else if (type == PROP_ENUM) {
          if (index == RNA_ENUM_VALUE) {
            int enum_value = RNA_property_enum_get(ptr, prop);
            if (prop_flag & PROP_ICONS_CONSECUTIVE) {
              icon = ICON_CHECKBOX_DEHLT; /* but->iconadd will set to correct icon */
            }
            else if (prop_flag & PROP_ENUM_FLAG) {
              icon = (enum_value & value) ? ICON_CHECKBOX_HLT : ICON_CHECKBOX_DEHLT;
            }
            else {
              icon = (enum_value == value) ? ICON_CHECKBOX_HLT : ICON_CHECKBOX_DEHLT;
            }
          }
        }
      }
    }
  
  #ifdef UI_PROP_SEP_ICON_WIDTH_EXCEPTION
    if (use_prop_sep) {
      if (type == PROP_BOOLEAN && (icon == ICON_NONE) && !icon_only) {
        use_prop_sep_split_label = false;
        /* For checkboxes we make an expection: We allow showing them in a split row even without
         * label. It typically relates to its neighbor items, so no need for an extra label. */
        use_split_empty_name = true;
      }
    }
  #endif
  
    if ((type == PROP_ENUM) && (RNA_property_flag(prop) & PROP_ENUM_FLAG)) {
      flag |= UI_ITEM_R_EXPAND;
    }
  
    const bool slider = (flag & UI_ITEM_R_SLIDER) != 0;
    const bool expand = (flag & UI_ITEM_R_EXPAND) != 0;
    const bool no_bg = (flag & UI_ITEM_R_NO_BG) != 0;
    const bool compact = (flag & UI_ITEM_R_COMPACT) != 0;
  
    /* get size */
    int w, h;
    ui_item_rna_size(layout, name, icon, ptr, prop, index, icon_only, compact, &w, &h);
  
    int prev_emboss = layout->emboss;
    if (no_bg) {
      layout->emboss = UI_EMBOSS_NONE;
    }
  
    uiBut *but = NULL;
  
    /* Split the label / property. */
    uiLayout *layout_parent = layout;
  
    if (use_prop_sep) {
      uiLayout *layout_row = NULL;
  #ifdef UI_PROP_DECORATE
      if (ui_decorate.use_prop_decorate) {
        layout_row = uiLayoutRow(layout, true);
        layout_row->space = 0;
        ui_decorate.len = max_ii(1, len);
      }
  #endif /* UI_PROP_DECORATE */
  
      if ((name[0] == '\0') && !use_split_empty_name) {
        /* Ensure we get a column when text is not set. */
        layout = uiLayoutColumn(layout_row ? layout_row : layout, true);
        layout->space = 0;
        if (heading_layout) {
          ui_layout_heading_label_add(layout, heading_layout, false, false);
        }
      }
      else {
        uiLayout *layout_split = uiLayoutSplit(
            layout_row ? layout_row : layout, UI_ITEM_PROP_SEP_DIVIDE, true);
        bool label_added = false;
        layout_split->space = 0;
        uiLayout *layout_sub = uiLayoutColumn(layout_split, true);
        layout_sub->space = 0;
  
        if (!use_prop_sep_split_label) {
          /* Pass */
        }
        else if (ui_item_rna_is_expand(prop, index, flag)) {
          char name_with_suffix[UI_MAX_DRAW_STR + 2];
          char str[2] = {'\0'};
          for (int a = 0; a < len; a++) {
            str[0] = RNA_property_array_item_char(prop, a);
            const bool use_prefix = (a == 0 && name && name[0]);
            if (use_prefix) {
              char *s = name_with_suffix;
              s += STRNCPY_RLEN(name_with_suffix, name);
              *s++ = ' ';
              *s++ = str[0];
              *s++ = '\0';
            }
            but = uiDefBut(block,
                           UI_BTYPE_LABEL,
                           0,
                           use_prefix ? name_with_suffix : str,
                           0,
                           0,
                           w,
                           UI_UNIT_Y,
                           NULL,
                           0.0,
                           0.0,
                           0,
                           0,
                           "");
            but->drawflag |= UI_BUT_TEXT_RIGHT;
            but->drawflag &= ~UI_BUT_TEXT_LEFT;
  
            label_added = true;
          }
        }
        else {
          if (name) {
            but = uiDefBut(
                block, UI_BTYPE_LABEL, 0, name, 0, 0, w, UI_UNIT_Y, NULL, 0.0, 0.0, 0, 0, "");
            but->drawflag |= UI_BUT_TEXT_RIGHT;
            but->drawflag &= ~UI_BUT_TEXT_LEFT;
  
            label_added = true;
          }
        }
  
        if (!label_added && heading_layout) {
          ui_layout_heading_label_add(layout_sub, heading_layout, true, false);
        }
  
        layout_split = ui_item_prop_split_layout_hack(layout_parent, layout_split);
  
        /* Watch out! We can only write into the new layout now. */
        if ((type == PROP_ENUM) && (flag & UI_ITEM_R_EXPAND)) {
          /* Expanded enums each have their own name. */
  
          /* Often expanded enum's are better arranged into a row,
           * so check the existing layout. */
          if (uiLayoutGetLocalDir(layout) == UI_LAYOUT_HORIZONTAL) {
            layout = uiLayoutRow(layout_split, true);
          }
          else {
            layout = uiLayoutColumn(layout_split, true);
          }
        }
        else {
          if (use_prop_sep_split_label) {
            name = "";
          }
          layout = uiLayoutColumn(layout_split, true);
        }
        layout->space = 0;
      }
  
  #ifdef UI_PROP_DECORATE
      if (ui_decorate.use_prop_decorate) {
        ui_decorate.layout = uiLayoutColumn(layout_row, true);
        ui_decorate.layout->space = 0;
        UI_block_layout_set_current(block, layout);
        ui_decorate.but = block->buttons.last;
  
        /* Clear after. */
        layout->item.flag |= UI_ITEM_PROP_DECORATE_NO_PAD;
      }
  #endif /* UI_PROP_DECORATE */
    }
    /* End split. */
    else if (heading_layout) {
      /* Could not add heading to split layout, fallback to inserting it to the layout with the
       * heading itself. */
      ui_layout_heading_label_add(heading_layout, heading_layout, false, false);
    }
  
    /* array property */
    if (index == RNA_NO_INDEX && is_array) {
      if (inside_prop_sep) {
        /* Within a split row, add array items to a column so they match the column layout of
         * previous items (e.g. transform vector with lock icon for each item). */
        layout = uiLayoutColumn(layout, true);
      }
  
      ui_item_array(layout,
                    block,
                    name,
                    icon,
                    ptr,
                    prop,
                    len,
                    0,
                    0,
                    w,
                    h,
                    expand,
                    slider,
                    toggle,
                    icon_only,
                    compact,
                    !use_prop_sep_split_label);
    }
    /* enum item */
    else if (type == PROP_ENUM && index == RNA_ENUM_VALUE) {
      if (icon && name[0] && !icon_only) {
        uiDefIconTextButR_prop(
            block, UI_BTYPE_ROW, 0, icon, name, 0, 0, w, h, ptr, prop, -1, 0, value, -1, -1, NULL);
      }
      else if (icon) {
        uiDefIconButR_prop(
            block, UI_BTYPE_ROW, 0, icon, 0, 0, w, h, ptr, prop, -1, 0, value, -1, -1, NULL);
      }
      else {
        uiDefButR_prop(
            block, UI_BTYPE_ROW, 0, name, 0, 0, w, h, ptr, prop, -1, 0, value, -1, -1, NULL);
      }
    }
    /* expanded enum */
    else if (type == PROP_ENUM && expand) {
      ui_item_enum_expand(layout, block, ptr, prop, name, h, icon_only);
    }
    /* property with separate label */
    else if (type == PROP_ENUM || type == PROP_STRING || type == PROP_POINTER) {
      but = ui_item_with_label(layout, block, name, icon, ptr, prop, index, 0, 0, w, h, flag);
      ui_but_add_search(but, ptr, prop, NULL, NULL);
  
      if (layout->redalert) {
        UI_but_flag_enable(but, UI_BUT_REDALERT);
      }
  
      if (layout->activate_init) {
        UI_but_flag_enable(but, UI_BUT_ACTIVATE_ON_INIT);
      }
    }
    /* single button */
    else {
      but = uiDefAutoButR(block, ptr, prop, index, name, icon, 0, 0, w, h);
  
      if (slider && but->type == UI_BTYPE_NUM) {
        but->type = UI_BTYPE_NUM_SLIDER;
      }
  
      if (flag & UI_ITEM_R_CHECKBOX_INVERT) {
        if (ELEM(but->type,
                 UI_BTYPE_CHECKBOX,
                 UI_BTYPE_CHECKBOX_N,
                 UI_BTYPE_ICON_TOGGLE,
                 UI_BTYPE_ICON_TOGGLE_N)) {
          but->drawflag |= UI_BUT_CHECKBOX_INVERT;
        }
      }
  
      if ((toggle == 1) && but->type == UI_BTYPE_CHECKBOX) {
        but->type = UI_BTYPE_TOGGLE;
      }
  
      if (layout->redalert) {
        UI_but_flag_enable(but, UI_BUT_REDALERT);
      }
  
      if (layout->activate_init) {
        UI_but_flag_enable(but, UI_BUT_ACTIVATE_ON_INIT);
      }
    }
  
    /* The resulting button may have the icon set since boolean button drawing
     * is being 'helpful' and adding an icon for us.
     * In this case we want the ability not to have an icon.
     *
     * We could pass an argument not to set the icon to begin with however this is the one case
     * the functionality is needed.  */
    if (but && no_icon) {
      if ((icon == ICON_NONE) && (but->icon != ICON_NONE)) {
        ui_def_but_icon_clear(but);
      }
    }
  
    /* Mark non-embossed textfields inside a listbox. */
    if (but && (block->flag & UI_BLOCK_LIST_ITEM) && (but->type == UI_BTYPE_TEXT) &&
        (but->dt & UI_EMBOSS_NONE)) {
      UI_but_flag_enable(but, UI_BUT_LIST_ITEM);
    }
  
  #ifdef UI_PROP_DECORATE
    if (ui_decorate.use_prop_decorate) {
      uiBut *but_decorate = ui_decorate.but ? ui_decorate.but->next : block->buttons.first;
      const bool use_blank_decorator = (flag & UI_ITEM_R_FORCE_BLANK_DECORATE);
      uiLayout *layout_col = uiLayoutColumn(ui_decorate.layout, false);
      layout_col->space = 0;
      layout_col->emboss = UI_EMBOSS_NONE;
  
      int i;
      for (i = 0; i < ui_decorate.len && but_decorate; i++) {
        PointerRNA *ptr_dec = use_blank_decorator ? NULL : &but_decorate->rnapoin;
        PropertyRNA *prop_dec = use_blank_decorator ? NULL : but_decorate->rnaprop;
  
        /* The icons are set in 'ui_but_anim_flag' */
        uiItemDecoratorR_prop(layout_col, ptr_dec, prop_dec, but_decorate->rnaindex);
        but = block->buttons.last;
  
        /* Order the decorator after the button we decorate, this is used so we can always
         * do a quick lookup. */
        BLI_remlink(&block->buttons, but);
        BLI_insertlinkafter(&block->buttons, but_decorate, but);
        but_decorate = but->next;
      }
      BLI_assert(ELEM(i, 1, ui_decorate.len));
  
      layout->item.flag &= ~UI_ITEM_PROP_DECORATE_NO_PAD;
    }
  #endif /* UI_PROP_DECORATE */
  
    if (no_bg) {
      layout->emboss = prev_emboss;
    }
  
    /* ensure text isn't added to icon_only buttons */
    if (but && icon_only) {
      BLI_assert(but->str[0] == '\0');
    }
  }
  
  void uiItemR(
      uiLayout *layout, PointerRNA *ptr, const char *propname, int flag, const char *name, int icon)
  {
    PropertyRNA *prop = RNA_struct_find_property(ptr, propname);
  
    if (!prop) {
      ui_item_disabled(layout, propname);
      RNA_warning("property not found: %s.%s", RNA_struct_identifier(ptr->type), propname);
      return;
    }
  
    uiItemFullR(layout, ptr, prop, RNA_NO_INDEX, 0, flag, name, icon);
  }
  
  /**
   * Use a wrapper function since re-implementing all the logic in this function would be messy.
   */
  void uiItemFullR_with_popover(uiLayout *layout,
                                PointerRNA *ptr,
                                PropertyRNA *prop,
                                int index,
                                int value,
                                int flag,
                                const char *name,
                                int icon,
                                const char *panel_type)
  {
    uiBlock *block = layout->root->block;
    uiBut *but = block->buttons.last;
    uiItemFullR(layout, ptr, prop, index, value, flag, name, icon);
    but = but->next;
    while (but) {
      if (but->rnaprop == prop && ELEM(but->type, UI_BTYPE_MENU, UI_BTYPE_COLOR)) {
        ui_but_rna_menu_convert_to_panel_type(but, panel_type);
        break;
      }
      but = but->next;
    }
    if (but == NULL) {
      const char *propname = RNA_property_identifier(prop);
      ui_item_disabled(layout, panel_type);
      RNA_warning("property could not use a popover: %s.%s (%s)",
                  RNA_struct_identifier(ptr->type),
                  propname,
                  panel_type);
    }
  }
  
  void uiItemFullR_with_menu(uiLayout *layout,
                             PointerRNA *ptr,
                             PropertyRNA *prop,
                             int index,
                             int value,
                             int flag,
                             const char *name,
                             int icon,
                             const char *menu_type)
  {
    uiBlock *block = layout->root->block;
    uiBut *but = block->buttons.last;
    uiItemFullR(layout, ptr, prop, index, value, flag, name, icon);
    but = but->next;
    while (but) {
      if (but->rnaprop == prop && but->type == UI_BTYPE_MENU) {
        ui_but_rna_menu_convert_to_menu_type(but, menu_type);
        break;
      }
      but = but->next;
    }
    if (but == NULL) {
      const char *propname = RNA_property_identifier(prop);
      ui_item_disabled(layout, menu_type);
      RNA_warning("property could not use a menu: %s.%s (%s)",
                  RNA_struct_identifier(ptr->type),
                  propname,
                  menu_type);
    }
  }
  
  void uiItemEnumR_prop(uiLayout *layout,
                        const char *name,
                        int icon,
                        struct PointerRNA *ptr,
                        PropertyRNA *prop,
                        int value)
  {
    if (RNA_property_type(prop) != PROP_ENUM) {
      const char *propname = RNA_property_identifier(prop);
      ui_item_disabled(layout, propname);
      RNA_warning("property not an enum: %s.%s", RNA_struct_identifier(ptr->type), propname);
      return;
    }
  
    uiItemFullR(layout, ptr, prop, RNA_ENUM_VALUE, value, 0, name, icon);
  }
  
  void uiItemEnumR(uiLayout *layout,
                   const char *name,
                   int icon,
                   struct PointerRNA *ptr,
                   const char *propname,
                   int value)
  {
    PropertyRNA *prop = RNA_struct_find_property(ptr, propname);
  
    if (prop == NULL) {
      ui_item_disabled(layout, propname);
      RNA_warning("property not found: %s.%s", RNA_struct_identifier(ptr->type), propname);
      return;
    }
  
    uiItemFullR(layout, ptr, prop, RNA_ENUM_VALUE, value, 0, name, icon);
  }
  
  void uiItemEnumR_string_prop(uiLayout *layout,
                               struct PointerRNA *ptr,
                               PropertyRNA *prop,
                               const char *value,
                               const char *name,
                               int icon)
  {
    const EnumPropertyItem *item;
    int ivalue, a;
    bool free;
  
    if (UNLIKELY(RNA_property_type(prop) != PROP_ENUM)) {
      const char *propname = RNA_property_identifier(prop);
      ui_item_disabled(layout, propname);
      RNA_warning("not an enum property: %s.%s", RNA_struct_identifier(ptr->type), propname);
      return;
    }
  
    RNA_property_enum_items(layout->root->block->evil_C, ptr, prop, &item, NULL, &free);
  
    if (!RNA_enum_value_from_id(item, value, &ivalue)) {
      const char *propname = RNA_property_identifier(prop);
      if (free) {
        MEM_freeN((void *)item);
      }
      ui_item_disabled(layout, propname);
      RNA_warning("enum property value not found: %s", value);
      return;
    }
  
    for (a = 0; item[a].identifier; a++) {
      if (item[a].identifier[0] == '\0') {
        /* Skip enum item separators. */
        continue;
      }
      if (item[a].value == ivalue) {
        const char *item_name = name ?
                                    name :
                                    CTX_IFACE_(RNA_property_translation_context(prop), item[a].name);
        const int flag = item_name[0] ? 0 : UI_ITEM_R_ICON_ONLY;
  
        uiItemFullR(
            layout, ptr, prop, RNA_ENUM_VALUE, ivalue, flag, item_name, icon ? icon : item[a].icon);
        break;
      }
    }
  
    if (free) {
      MEM_freeN((void *)item);
    }
  }
  
  void uiItemEnumR_string(uiLayout *layout,
                          struct PointerRNA *ptr,
                          const char *propname,
                          const char *value,
                          const char *name,
                          int icon)
  {
    PropertyRNA *prop = RNA_struct_find_property(ptr, propname);
    if (UNLIKELY(prop == NULL)) {
      ui_item_disabled(layout, propname);
      RNA_warning("enum property not found: %s.%s", RNA_struct_identifier(ptr->type), propname);
      return;
    }
    uiItemEnumR_string_prop(layout, ptr, prop, value, name, icon);
  }
  
  void uiItemsEnumR(uiLayout *layout, struct PointerRNA *ptr, const char *propname)
  {
    PropertyRNA *prop;
    uiBlock *block = layout->root->block;
    uiBut *bt;
  
    prop = RNA_struct_find_property(ptr, propname);
  
    if (!prop) {
      ui_item_disabled(layout, propname);
      RNA_warning("enum property not found: %s.%s", RNA_struct_identifier(ptr->type), propname);
      return;
    }
  
    if (RNA_property_type(prop) != PROP_ENUM) {
      RNA_warning("not an enum property: %s.%s", RNA_struct_identifier(ptr->type), propname);
      return;
    }
    else {
      const EnumPropertyItem *item;
      int totitem, i;
      bool free;
      uiLayout *split = uiLayoutSplit(layout, 0.0f, false);
      uiLayout *column = uiLayoutColumn(split, false);
  
      RNA_property_enum_items_gettexted(block->evil_C, ptr, prop, &item, &totitem, &free);
  
      for (i = 0; i < totitem; i++) {
        if (item[i].identifier[0]) {
          uiItemEnumR_prop(column, item[i].name, item[i].icon, ptr, prop, item[i].value);
          ui_but_tip_from_enum_item(block->buttons.last, &item[i]);
        }
        else {
          if (item[i].name) {
            if (i != 0) {
              column = uiLayoutColumn(split, false);
              /* inconsistent, but menus with labels do not look good flipped */
              block->flag |= UI_BLOCK_NO_FLIP;
            }
  
            uiItemL(column, item[i].name, ICON_NONE);
            bt = block->buttons.last;
            bt->drawflag = UI_BUT_TEXT_LEFT;
  
            ui_but_tip_from_enum_item(bt, &item[i]);
          }
          else {
            uiItemS(column);
          }
        }
      }
  
      if (free) {
        MEM_freeN((void *)item);
      }
    }
  
    /* intentionally don't touch UI_BLOCK_IS_FLIP here,
     * we don't know the context this is called in */
  }
  
  /* Pointer RNA button with search */
  
  static void search_id_collection(StructRNA *ptype, PointerRNA *r_ptr, PropertyRNA **r_prop)
  {
    StructRNA *srna;
  
    /* look for collection property in Main */
    /* Note: using global Main is OK-ish here, UI shall not access other Mains anyay... */
    RNA_main_pointer_create(G_MAIN, r_ptr);
  
    *r_prop = NULL;
  
    RNA_STRUCT_BEGIN (r_ptr, iprop) {
      /* if it's a collection and has same pointer type, we've got it */
      if (RNA_property_type(iprop) == PROP_COLLECTION) {
        srna = RNA_property_pointer_type(r_ptr, iprop);
  
        if (ptype == srna) {
          *r_prop = iprop;
          break;
        }
      }
    }
    RNA_STRUCT_END;
  }
  
  static void ui_rna_collection_search_free_cb(void *ptr)
  {
    uiRNACollectionSearch *coll_search = ptr;
    UI_butstore_free(coll_search->butstore_block, coll_search->butstore);
    MEM_freeN(ptr);
  }
  
  void ui_but_add_search(
      uiBut *but, PointerRNA *ptr, PropertyRNA *prop, PointerRNA *searchptr, PropertyRNA *searchprop)
  {
    StructRNA *ptype;
    PointerRNA sptr;
  
    /* for ID's we do automatic lookup */
    if (!searchprop) {
      if (RNA_property_type(prop) == PROP_POINTER) {
        ptype = RNA_property_pointer_type(ptr, prop);
        search_id_collection(ptype, &sptr, &searchprop);
        searchptr = &sptr;
      }
    }
  
    /* turn button into search button */
    if (searchprop) {
      uiRNACollectionSearch *coll_search = MEM_mallocN(sizeof(*coll_search), __func__);
  
      but->type = UI_BTYPE_SEARCH_MENU;
      but->hardmax = MAX2(but->hardmax, 256.0f);
      but->rnasearchpoin = *searchptr;
      but->rnasearchprop = searchprop;
      but->drawflag |= UI_BUT_ICON_LEFT | UI_BUT_TEXT_LEFT;
      if (RNA_property_is_unlink(prop)) {
        but->flag |= UI_BUT_VALUE_CLEAR;
      }
  
      coll_search->target_ptr = *ptr;
      coll_search->target_prop = prop;
      coll_search->search_ptr = *searchptr;
      coll_search->search_prop = searchprop;
      coll_search->search_but = but;
      coll_search->butstore_block = but->block;
      coll_search->butstore = UI_butstore_create(coll_search->butstore_block);
      UI_butstore_register(coll_search->butstore, &coll_search->search_but);
  
      if (RNA_property_type(prop) == PROP_ENUM) {
        /* XXX, this will have a menu string,
         * but in this case we just want the text */
        but->str[0] = 0;
      }
  
      UI_but_func_search_set(but,
                             ui_searchbox_create_generic,
                             ui_rna_collection_search_cb,
                             coll_search,
                             ui_rna_collection_search_free_cb,
                             NULL,
                             NULL,
                             NULL);
    }
    else if (but->type == UI_BTYPE_SEARCH_MENU) {
      /* In case we fail to find proper searchprop,
       * so other code might have already set but->type to search menu... */
      but->flag |= UI_BUT_DISABLED;
    }
  }
  
  void uiItemPointerR_prop(uiLayout *layout,
                           PointerRNA *ptr,
                           PropertyRNA *prop,
                           PointerRNA *searchptr,
                           PropertyRNA *searchprop,
                           const char *name,
                           int icon)
  {
    PropertyType type;
    uiBut *but;
    uiBlock *block;
    StructRNA *icontype;
    int w, h;
    char namestr[UI_MAX_NAME_STR];
    const bool use_prop_sep = ((layout->item.flag & UI_ITEM_PROP_SEP) != 0);
  
    type = RNA_property_type(prop);
    if (!ELEM(type, PROP_POINTER, PROP_STRING, PROP_ENUM)) {
      RNA_warning("Property %s.%s must be a pointer, string or enum",
                  RNA_struct_identifier(ptr->type),
                  RNA_property_identifier(prop));
      return;
    }
    if (RNA_property_type(searchprop) != PROP_COLLECTION) {
      RNA_warning("search collection property is not a collection type: %s.%s",
                  RNA_struct_identifier(searchptr->type),
                  RNA_property_identifier(searchprop));
      return;
    }
  
    /* get icon & name */
    if (icon == ICON_NONE) {
      if (type == PROP_POINTER) {
        icontype = RNA_property_pointer_type(ptr, prop);
      }
      else {
        icontype = RNA_property_pointer_type(searchptr, searchprop);
      }
  
      icon = RNA_struct_ui_icon(icontype);
    }
    if (!name) {
      name = RNA_property_ui_name(prop);
    }
  
    if (use_prop_sep == false) {
      name = ui_item_name_add_colon(name, namestr);
    }
  
    /* create button */
    block = uiLayoutGetBlock(layout);
  
    ui_item_rna_size(layout, name, icon, ptr, prop, 0, 0, false, &w, &h);
    w += UI_UNIT_X; /* X icon needs more space */
    but = ui_item_with_label(layout, block, name, icon, ptr, prop, 0, 0, 0, w, h, 0);
  
    ui_but_add_search(but, ptr, prop, searchptr, searchprop);
  }
  
  void uiItemPointerR(uiLayout *layout,
                      PointerRNA *ptr,
                      const char *propname,
                      PointerRNA *searchptr,
                      const char *searchpropname,
                      const char *name,
                      int icon)
  {
    PropertyRNA *prop, *searchprop;
  
    /* validate arguments */
    prop = RNA_struct_find_property(ptr, propname);
    if (!prop) {
      RNA_warning("property not found: %s.%s", RNA_struct_identifier(ptr->type), propname);
      return;
    }
    searchprop = RNA_struct_find_property(searchptr, searchpropname);
    if (!searchprop) {
      RNA_warning("search collection property not found: %s.%s",
                  RNA_struct_identifier(searchptr->type),
                  searchpropname);
      return;
    }
  
    uiItemPointerR_prop(layout, ptr, prop, searchptr, searchprop, name, icon);
  }
  
  /* menu item */
  void ui_item_menutype_func(bContext *C, uiLayout *layout, void *arg_mt)
  {
    MenuType *mt = (MenuType *)arg_mt;
  
    UI_menutype_draw(C, mt, layout);
  
    /* menus are created flipped (from event handling pov) */
    layout->root->block->flag ^= UI_BLOCK_IS_FLIP;
  }
  
  void ui_item_paneltype_func(bContext *C, uiLayout *layout, void *arg_pt)
  {
    PanelType *pt = (PanelType *)arg_pt;
    UI_paneltype_draw(C, pt, layout);
  
    /* panels are created flipped (from event handling pov) */
    layout->root->block->flag ^= UI_BLOCK_IS_FLIP;
  }
  
  static uiBut *ui_item_menu(uiLayout *layout,
                             const char *name,
                             int icon,
                             uiMenuCreateFunc func,
                             void *arg,
                             void *argN,
                             const char *tip,
                             bool force_menu)
  {
    uiBlock *block = layout->root->block;
    uiLayout *heading_layout = ui_layout_heading_find(layout);
    uiBut *but;
    int w, h;
  
    UI_block_layout_set_current(block, layout);
  
    if (!name) {
      name = "";
    }
    if (layout->root->type == UI_LAYOUT_MENU && !icon) {
      icon = ICON_BLANK1;
    }
  
    w = ui_text_icon_width(layout, name, icon, 1);
    h = UI_UNIT_Y;
  
    if (layout->root->type == UI_LAYOUT_HEADER) { /* ugly .. */
      if (icon == ICON_NONE && force_menu) {
        /* pass */
      }
      else if (force_menu) {
        w += 0.6f * UI_UNIT_X;
      }
      else {
        if (name[0]) {
          w -= UI_UNIT_X / 2;
        }
      }
    }
  
    if (heading_layout) {
      ui_layout_heading_label_add(layout, heading_layout, true, true);
    }
  
    if (name[0] && icon) {
      but = uiDefIconTextMenuBut(block, func, arg, icon, name, 0, 0, w, h, tip);
    }
    else if (icon) {
      but = uiDefIconMenuBut(block, func, arg, icon, 0, 0, w, h, tip);
      if (force_menu && name[0]) {
        UI_but_drawflag_enable(but, UI_BUT_ICON_LEFT);
      }
    }
    else {
      but = uiDefMenuBut(block, func, arg, name, 0, 0, w, h, tip);
    }
  
    if (argN) {
      /* ugly .. */
      if (arg != argN) {
        but->poin = (char *)but;
      }
      but->func_argN = argN;
    }
  
    if (ELEM(layout->root->type, UI_LAYOUT_PANEL, UI_LAYOUT_TOOLBAR) ||
        /* We never want a dropdown in menu! */
        (force_menu && layout->root->type != UI_LAYOUT_MENU)) {
      UI_but_type_set_menu_from_pulldown(but);
    }
  
    return but;
  }
  
  void uiItemM_ptr(uiLayout *layout, MenuType *mt, const char *name, int icon)
  {
    if (!name) {
      name = CTX_IFACE_(mt->translation_context, mt->label);
    }
  
    if (layout->root->type == UI_LAYOUT_MENU && !icon) {
      icon = ICON_BLANK1;
    }
  
    ui_item_menu(layout,
                 name,
                 icon,
                 ui_item_menutype_func,
                 mt,
                 NULL,
                 mt->description ? TIP_(mt->description) : "",
                 false);
  }
  
  void uiItemM(uiLayout *layout, const char *menuname, const char *name, int icon)
  {
    MenuType *mt = WM_menutype_find(menuname, false);
    if (mt == NULL) {
      RNA_warning("not found %s", menuname);
      return;
    }
    uiItemM_ptr(layout, mt, name, icon);
  }
  
  void uiItemMContents(uiLayout *layout, const char *menuname)
  {
    MenuType *mt = WM_menutype_find(menuname, false);
    if (mt == NULL) {
      RNA_warning("not found %s", menuname);
      return;
    }
  
    uiBlock *block = layout->root->block;
    bContext *C = block->evil_C;
    UI_menutype_draw(C, mt, layout);
  }
  
  /**
   * Insert a decorator item for a button with the same property as \a prop.
   * To force inserting a blank dummy element, NULL can be passed for \a ptr and \a prop.
   */
  void uiItemDecoratorR_prop(uiLayout *layout, PointerRNA *ptr, PropertyRNA *prop, int index)
  {
    uiBlock *block = layout->root->block;
    uiBut *but = NULL;
  
    uiLayout *col;
    UI_block_layout_set_current(block, layout);
    col = uiLayoutColumn(layout, false);
    col->space = 0;
    col->emboss = UI_EMBOSS_NONE;
  
    if (ELEM(NULL, ptr, prop) || !RNA_property_animateable(ptr, prop)) {
      but = uiDefIconBut(block,
                         UI_BTYPE_BUT,
                         0,
                         ICON_BLANK1,
                         0,
                         0,
                         UI_UNIT_X,
                         UI_UNIT_Y,
                         NULL,
                         0.0,
                         0.0,
                         0.0,
                         0.0,
                         "");
      but->flag |= UI_BUT_DISABLED;
      return;
    }
  
    const bool is_expand = ui_item_rna_is_expand(prop, index, 0);
    const bool is_array = RNA_property_array_check(prop);
  
    /* Loop for the array-case, but only do in case of an expanded array. */
    for (int i = 0; i < (is_expand ? RNA_property_array_length(ptr, prop) : 1); i++) {
      but = uiDefIconBut(block,
                         UI_BTYPE_BUT,
                         0,
                         ICON_DOT,
                         0,
                         0,
                         UI_UNIT_X,
                         UI_UNIT_Y,
                         NULL,
                         0.0,
                         0.0,
                         0.0,
                         0.0,
                         TIP_("Animate property"));
      UI_but_func_set(but, ui_but_anim_decorate_cb, but, NULL);
      but->flag |= UI_BUT_UNDO | UI_BUT_DRAG_LOCK;
      /* Reusing RNA search members, setting actual RNA data has many side-effects. */
      but->rnasearchpoin = *ptr;
      but->rnasearchprop = prop;
      /* ui_def_but_rna() sets non-array buttons to have a RNA index of 0. */
      but->custom_data = POINTER_FROM_INT((!is_array || is_expand) ? i : index);
    }
  }
  
  /**
   * Insert a decorator item for a button with the same property as \a prop.
   * To force inserting a blank dummy element, NULL can be passed for \a ptr and \a propname.
   */
  void uiItemDecoratorR(uiLayout *layout, PointerRNA *ptr, const char *propname, int index)
  {
    PropertyRNA *prop = NULL;
  
    if (ptr && propname) {
      /* validate arguments */
      prop = RNA_struct_find_property(ptr, propname);
      if (!prop) {
        ui_item_disabled(layout, propname);
        RNA_warning("property not found: %s.%s", RNA_struct_identifier(ptr->type), propname);
        return;
      }
    }
  
    /* ptr and prop are allowed to be NULL here. */
    uiItemDecoratorR_prop(layout, ptr, prop, index);
  }
  
  /* popover */
  void uiItemPopoverPanel_ptr(
      uiLayout *layout, bContext *C, PanelType *pt, const char *name, int icon)
  {
    if (!name) {
      name = CTX_IFACE_(pt->translation_context, pt->label);
    }
  
    if (layout->root->type == UI_LAYOUT_MENU && !icon) {
      icon = ICON_BLANK1;
    }
  
    const bool ok = (pt->poll == NULL) || pt->poll(C, pt);
    if (ok && (pt->draw_header != NULL)) {
      layout = uiLayoutRow(layout, true);
      Panel panel = {
          .type = pt,
          .layout = layout,
          .flag = PNL_POPOVER,
      };
      pt->draw_header(C, &panel);
    }
    uiBut *but = ui_item_menu(layout, name, icon, ui_item_paneltype_func, pt, NULL, NULL, true);
    but->type = UI_BTYPE_POPOVER;
    if (!ok) {
      but->flag |= UI_BUT_DISABLED;
    }
  }
  
  void uiItemPopoverPanel(
      uiLayout *layout, bContext *C, const char *panel_type, const char *name, int icon)
  {
    PanelType *pt = WM_paneltype_find(panel_type, true);
    if (pt == NULL) {
      RNA_warning("Panel type not found '%s'", panel_type);
      return;
    }
    uiItemPopoverPanel_ptr(layout, C, pt, name, icon);
  }
  
  void uiItemPopoverPanelFromGroup(uiLayout *layout,
                                   bContext *C,
                                   int space_id,
                                   int region_id,
                                   const char *context,
                                   const char *category)
  {
    SpaceType *st = BKE_spacetype_from_id(space_id);
    if (st == NULL) {
      RNA_warning("space type not found %d", space_id);
      return;
    }
    ARegionType *art = BKE_regiontype_from_id(st, region_id);
    if (art == NULL) {
      RNA_warning("region type not found %d", region_id);
      return;
    }
  
    LISTBASE_FOREACH (PanelType *, pt, &art->paneltypes) {
      /* Causes too many panels, check context. */
      if (pt->parent_id[0] == '\0') {
        if (/* (*context == '\0') || */ STREQ(pt->context, context)) {
          if ((*category == '\0') || STREQ(pt->category, category)) {
            if (pt->poll == NULL || pt->poll(C, pt)) {
              uiItemPopoverPanel_ptr(layout, C, pt, NULL, ICON_NONE);
            }
          }
        }
      }
    }
  }
  
  /* label item */
  static uiBut *uiItemL_(uiLayout *layout, const char *name, int icon)
  {
    uiBlock *block = layout->root->block;
    uiBut *but;
    int w;
  
    UI_block_layout_set_current(block, layout);
  
    if (!name) {
      name = "";
    }
    if (layout->root->type == UI_LAYOUT_MENU && !icon) {
      icon = ICON_BLANK1;
    }
  
    w = ui_text_icon_width(layout, name, icon, 0);
  
    if (icon && name[0]) {
      but = uiDefIconTextBut(
          block, UI_BTYPE_LABEL, 0, icon, name, 0, 0, w, UI_UNIT_Y, NULL, 0.0, 0.0, 0, 0, NULL);
    }
    else if (icon) {
      but = uiDefIconBut(
          block, UI_BTYPE_LABEL, 0, icon, 0, 0, w, UI_UNIT_Y, NULL, 0.0, 0.0, 0, 0, NULL);
    }
    else {
      but = uiDefBut(block, UI_BTYPE_LABEL, 0, name, 0, 0, w, UI_UNIT_Y, NULL, 0.0, 0.0, 0, 0, NULL);
    }
  
    /* to compensate for string size padding in ui_text_icon_width,
     * make text aligned right if the layout is aligned right.
     */
    if (uiLayoutGetAlignment(layout) == UI_LAYOUT_ALIGN_RIGHT) {
      but->drawflag &= ~UI_BUT_TEXT_LEFT; /* default, needs to be unset */
      but->drawflag |= UI_BUT_TEXT_RIGHT;
    }
  
    /* Mark as a label inside a listbox. */
    if (block->flag & UI_BLOCK_LIST_ITEM) {
      but->flag |= UI_BUT_LIST_ITEM;
    }
  
    if (layout->redalert) {
      UI_but_flag_enable(but, UI_BUT_REDALERT);
    }
  
    return but;
  }
  
  void uiItemL_ex(
      uiLayout *layout, const char *name, int icon, const bool highlight, const bool redalert)
  {
    uiBut *but = uiItemL_(layout, name, icon);
  
    if (highlight) {
      /* TODO: add another flag for this. */
      UI_but_flag_enable(but, UI_SELECT_DRAW);
    }
  
    if (redalert) {
      UI_but_flag_enable(but, UI_BUT_REDALERT);
    }
  }
  
  void uiItemL(uiLayout *layout, const char *name, int icon)
  {
    uiItemL_(layout, name, icon);
  }
  
  /**
   * Normally, we handle the split layout in #uiItemFullR(), but there are other cases where the
   * logic is needed. Ideally, #uiItemFullR() could just call this, but it currently has too many
   * special needs.
   */
  uiPropertySplitWrapper uiItemPropertySplitWrapperCreate(uiLayout *parent_layout)
  {
    uiPropertySplitWrapper split_wrapper = {NULL};
  
    uiLayout *layout_row = uiLayoutRow(parent_layout, true);
    uiLayout *layout_split = uiLayoutSplit(layout_row, UI_ITEM_PROP_SEP_DIVIDE, true);
  
    layout_split->space = 0;
    split_wrapper.label_column = uiLayoutColumn(layout_split, true);
    split_wrapper.label_column->alignment = UI_LAYOUT_ALIGN_RIGHT;
    split_wrapper.property_row = ui_item_prop_split_layout_hack(parent_layout, layout_split);
    split_wrapper.decorate_column = uiLayoutColumn(layout_row, true);
  
    return split_wrapper;
  }
  
  /*
   * Helper to add a label and creates a property split layout if needed.
   */
  uiLayout *uiItemL_respect_property_split(uiLayout *layout, const char *text, int icon)
  {
    if (layout->item.flag & UI_ITEM_PROP_SEP) {
      uiBlock *block = uiLayoutGetBlock(layout);
      uiPropertySplitWrapper split_wrapper = uiItemPropertySplitWrapperCreate(layout);
      /* Further items added to 'layout' will automatically be added to split_wrapper.property_row */
  
      uiItemL_(split_wrapper.label_column, text, icon);
      UI_block_layout_set_current(block, split_wrapper.property_row);
  
      return split_wrapper.decorate_column;
    }
    else {
      char namestr[UI_MAX_NAME_STR];
      if (text) {
        text = ui_item_name_add_colon(text, namestr);
      }
      uiItemL_(layout, text, icon);
  
      return layout;
    }
  }
  
  void uiItemLDrag(uiLayout *layout, PointerRNA *ptr, const char *name, int icon)
  {
    uiBut *but = uiItemL_(layout, name, icon);
  
    if (ptr && ptr->type) {
      if (RNA_struct_is_ID(ptr->type)) {
        UI_but_drag_set_id(but, ptr->owner_id);
      }
    }
  }
  
  /* value item */
  void uiItemV(uiLayout *layout, const char *name, int icon, int argval)
  {
    /* label */
    uiBlock *block = layout->root->block;
    int *retvalue = (block->handle) ? &block->handle->retvalue : NULL;
    int w;
  
    UI_block_layout_set_current(block, layout);
  
    if (!name) {
      name = "";
    }
    if (layout->root->type == UI_LAYOUT_MENU && !icon) {
      icon = ICON_BLANK1;
    }
  
    w = ui_text_icon_width(layout, name, icon, 0);
  
    if (icon && name[0]) {
      uiDefIconTextButI(block,
                        UI_BTYPE_BUT,
                        argval,
                        icon,
                        name,
                        0,
                        0,
                        w,
                        UI_UNIT_Y,
                        retvalue,
                        0.0,
                        0.0,
                        0,
                        -1,
                        "");
    }
    else if (icon) {
      uiDefIconButI(
          block, UI_BTYPE_BUT, argval, icon, 0, 0, w, UI_UNIT_Y, retvalue, 0.0, 0.0, 0, -1, "");
    }
    else {
      uiDefButI(
          block, UI_BTYPE_BUT, argval, name, 0, 0, w, UI_UNIT_Y, retvalue, 0.0, 0.0, 0, -1, "");
    }
  }
  
  /* separator item */
  void uiItemS_ex(uiLayout *layout, float factor)
  {
    uiBlock *block = layout->root->block;
    bool is_menu = ui_block_is_menu(block);
    if (is_menu && !UI_block_can_add_separator(block)) {
      return;
    }
    int space = (is_menu) ? 0.45f * UI_UNIT_X : 0.3f * UI_UNIT_X;
    space *= factor;
  
    UI_block_layout_set_current(block, layout);
    uiDefBut(block,
             (is_menu) ? UI_BTYPE_SEPR_LINE : UI_BTYPE_SEPR,
             0,
             "",
             0,
             0,
             space,
             space,
             NULL,
             0.0,
             0.0,
             0,
             0,
             "");
  }
  
  /* separator item */
  void uiItemS(uiLayout *layout)
  {
    uiItemS_ex(layout, 1.0f);
  }
  
  /* Flexible spacing. */
  void uiItemSpacer(uiLayout *layout)
  {
    uiBlock *block = layout->root->block;
    const bool is_popup = ui_block_is_popup_any(block);
  
    if (is_popup) {
      printf("Error: separator_spacer() not supported in popups.\n");
      return;
    }
  
    if (block->direction & UI_DIR_RIGHT) {
      printf("Error: separator_spacer() only supported in horizontal blocks.\n");
      return;
    }
  
    UI_block_layout_set_current(block, layout);
    uiDefBut(block,
             UI_BTYPE_SEPR_SPACER,
             0,
             "",
             0,
             0,
             0.3f * UI_UNIT_X,
             UI_UNIT_Y,
             NULL,
             0.0,
             0.0,
             0,
             0,
             "");
  }
  
  /* level items */
  void uiItemMenuF(uiLayout *layout, const char *name, int icon, uiMenuCreateFunc func, void *arg)
  {
    if (!func) {
      return;
    }
  
    ui_item_menu(layout, name, icon, func, arg, NULL, "", false);
  }
  
  /**
   * Version of #uiItemMenuF that free's `argN`.
   */
  void uiItemMenuFN(uiLayout *layout, const char *name, int icon, uiMenuCreateFunc func, void *argN)
  {
    if (!func) {
      return;
    }
  
    /* Second 'argN' only ensures it gets freed. */
    ui_item_menu(layout, name, icon, func, argN, argN, "", false);
  }
  
  typedef struct MenuItemLevel {
    int opcontext;
    /* don't use pointers to the strings because python can dynamically
     * allocate strings and free before the menu draws, see [#27304] */
    char opname[OP_MAX_TYPENAME];
    char propname[MAX_IDPROP_NAME];
    PointerRNA rnapoin;
  } MenuItemLevel;
  
  static void menu_item_enum_opname_menu(bContext *UNUSED(C), uiLayout *layout, void *arg)
  {
    MenuItemLevel *lvl = (MenuItemLevel *)(((uiBut *)arg)->func_argN);
  
    uiLayoutSetOperatorContext(layout, lvl->opcontext);
    uiItemsEnumO(layout, lvl->opname, lvl->propname);
  
    layout->root->block->flag |= UI_BLOCK_IS_FLIP;
  
    /* override default, needed since this was assumed pre 2.70 */
    UI_block_direction_set(layout->root->block, UI_DIR_DOWN);
  }
  
  void uiItemMenuEnumO_ptr(uiLayout *layout,
                           bContext *C,
                           wmOperatorType *ot,
                           const char *propname,
                           const char *name,
                           int icon)
  {
    MenuItemLevel *lvl;
    uiBut *but;
  
    /* Caller must check */
    BLI_assert(ot->srna != NULL);
  
    if (name == NULL) {
      name = WM_operatortype_name(ot, NULL);
    }
  
    if (layout->root->type == UI_LAYOUT_MENU && !icon) {
      icon = ICON_BLANK1;
    }
  
    lvl = MEM_callocN(sizeof(MenuItemLevel), "MenuItemLevel");
    BLI_strncpy(lvl->opname, ot->idname, sizeof(lvl->opname));
    BLI_strncpy(lvl->propname, propname, sizeof(lvl->propname));
    lvl->opcontext = layout->root->opcontext;
  
    but = ui_item_menu(layout,
                       name,
                       icon,
                       menu_item_enum_opname_menu,
                       NULL,
                       lvl,
                       RNA_struct_ui_description(ot->srna),
                       true);
  
    /* add hotkey here, lower UI code can't detect it */
    if ((layout->root->block->flag & UI_BLOCK_LOOP) && (ot->prop && ot->invoke)) {
      char keybuf[128];
      if (WM_key_event_operator_string(
              C, ot->idname, layout->root->opcontext, NULL, false, keybuf, sizeof(keybuf))) {
        ui_but_add_shortcut(but, keybuf, false);
      }
    }
  }
  
  void uiItemMenuEnumO(uiLayout *layout,
                       bContext *C,
                       const char *opname,
                       const char *propname,
                       const char *name,
                       int icon)
  {
    wmOperatorType *ot = WM_operatortype_find(opname, 0); /* print error next */
  
    UI_OPERATOR_ERROR_RET(ot, opname, return );
  
    if (!ot->srna) {
      ui_item_disabled(layout, opname);
      RNA_warning("operator missing srna '%s'", opname);
      return;
    }
  
    uiItemMenuEnumO_ptr(layout, C, ot, propname, name, icon);
  }
  
  static void menu_item_enum_rna_menu(bContext *UNUSED(C), uiLayout *layout, void *arg)
  {
    MenuItemLevel *lvl = (MenuItemLevel *)(((uiBut *)arg)->func_argN);
  
    uiLayoutSetOperatorContext(layout, lvl->opcontext);
    uiItemsEnumR(layout, &lvl->rnapoin, lvl->propname);
    layout->root->block->flag |= UI_BLOCK_IS_FLIP;
  }
  
  void uiItemMenuEnumR_prop(
      uiLayout *layout, struct PointerRNA *ptr, PropertyRNA *prop, const char *name, int icon)
  {
    MenuItemLevel *lvl;
  
    if (!name) {
      name = RNA_property_ui_name(prop);
    }
    if (layout->root->type == UI_LAYOUT_MENU && !icon) {
      icon = ICON_BLANK1;
    }
  
    lvl = MEM_callocN(sizeof(MenuItemLevel), "MenuItemLevel");
    lvl->rnapoin = *ptr;
    BLI_strncpy(lvl->propname, RNA_property_identifier(prop), sizeof(lvl->propname));
    lvl->opcontext = layout->root->opcontext;
  
    ui_item_menu(layout,
                 name,
                 icon,
                 menu_item_enum_rna_menu,
                 NULL,
                 lvl,
                 RNA_property_description(prop),
                 false);
  }
  
  void uiItemMenuEnumR(
      uiLayout *layout, struct PointerRNA *ptr, const char *propname, const char *name, int icon)
  {
    PropertyRNA *prop;
  
    prop = RNA_struct_find_property(ptr, propname);
    if (!prop) {
      ui_item_disabled(layout, propname);
      RNA_warning("property not found: %s.%s", RNA_struct_identifier(ptr->type), propname);
      return;
    }
  
    uiItemMenuEnumR_prop(layout, ptr, prop, name, icon);
  }
  
  void uiItemTabsEnumR_prop(
      uiLayout *layout, bContext *C, PointerRNA *ptr, PropertyRNA *prop, bool icon_only)
  {
    uiBlock *block = layout->root->block;
  
    UI_block_layout_set_current(block, layout);
    ui_item_enum_expand_tabs(layout, C, block, ptr, prop, NULL, UI_UNIT_Y, icon_only);
  }
  
  /** \} */
  
  /* -------------------------------------------------------------------- */
  /** \name Layout Items
   * \{ */
  
  /* single-row layout */
  static void ui_litem_estimate_row(uiLayout *litem)
  {
    uiItem *item;
    int itemw, itemh;
    bool min_size_flag = true;
  
    litem->w = 0;
    litem->h = 0;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
  
      min_size_flag = min_size_flag && (item->flag & UI_ITEM_FIXED_SIZE);
  
      litem->w += itemw;
      litem->h = MAX2(itemh, litem->h);
  
      if (item->next) {
        litem->w += litem->space;
      }
    }
  
    if (min_size_flag) {
      litem->item.flag |= UI_ITEM_FIXED_SIZE;
    }
  }
  
  static int ui_litem_min_width(int itemw)
  {
    return MIN2(2 * UI_UNIT_X, itemw);
  }
  
  static void ui_litem_layout_row(uiLayout *litem)
  {
    uiItem *item, *last_free_item = NULL;
    int x, y, w, tot, totw, neww, newtotw, itemw, minw, itemh, offset;
    int fixedw, freew, fixedx, freex, flag = 0, lastw = 0;
    float extra_pixel;
  
    /* x = litem->x; */ /* UNUSED */
    y = litem->y;
    w = litem->w;
    totw = 0;
    tot = 0;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
      totw += itemw;
      tot++;
    }
  
    if (totw == 0) {
      return;
    }
  
    if (w != 0) {
      w -= (tot - 1) * litem->space;
    }
    fixedw = 0;
  
    /* keep clamping items to fixed minimum size until all are done */
    do {
      freew = 0;
      x = 0;
      flag = 0;
      newtotw = totw;
      extra_pixel = 0.0f;
  
      for (item = litem->items.first; item; item = item->next) {
        if (item->flag & UI_ITEM_AUTO_FIXED_SIZE) {
          continue;
        }
  
        ui_item_size(item, &itemw, &itemh);
        minw = ui_litem_min_width(itemw);
  
        if (w - lastw > 0) {
          neww = ui_item_fit(itemw, x, totw, w - lastw, !item->next, litem->alignment, &extra_pixel);
        }
        else {
          neww = 0; /* no space left, all will need clamping to minimum size */
        }
  
        x += neww;
  
        bool min_flag = item->flag & UI_ITEM_FIXED_SIZE;
        /* ignore min flag for rows with right or center alignment */
        if (item->type != ITEM_BUTTON &&
            ELEM(((uiLayout *)item)->alignment, UI_LAYOUT_ALIGN_RIGHT, UI_LAYOUT_ALIGN_CENTER) &&
            litem->alignment == UI_LAYOUT_ALIGN_EXPAND &&
            ((uiItem *)litem)->flag & UI_ITEM_FIXED_SIZE) {
          min_flag = false;
        }
  
        if ((neww < minw || min_flag) && w != 0) {
          /* fixed size */
          item->flag |= UI_ITEM_AUTO_FIXED_SIZE;
          if (item->type != ITEM_BUTTON && item->flag & UI_ITEM_FIXED_SIZE) {
            minw = itemw;
          }
          fixedw += minw;
          flag = 1;
          newtotw -= itemw;
        }
        else {
          /* keep free size */
          item->flag &= ~UI_ITEM_AUTO_FIXED_SIZE;
          freew += itemw;
        }
      }
  
      totw = newtotw;
      lastw = fixedw;
    } while (flag);
  
    freex = 0;
    fixedx = 0;
    extra_pixel = 0.0f;
    x = litem->x;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
      minw = ui_litem_min_width(itemw);
  
      if (item->flag & UI_ITEM_AUTO_FIXED_SIZE) {
        /* fixed minimum size items */
        if (item->type != ITEM_BUTTON && item->flag & UI_ITEM_FIXED_SIZE) {
          minw = itemw;
        }
        itemw = ui_item_fit(
            minw, fixedx, fixedw, min_ii(w, fixedw), !item->next, litem->alignment, &extra_pixel);
        fixedx += itemw;
      }
      else {
        /* free size item */
        itemw = ui_item_fit(
            itemw, freex, freew, w - fixedw, !item->next, litem->alignment, &extra_pixel);
        freex += itemw;
        last_free_item = item;
      }
  
      /* align right/center */
      offset = 0;
      if (litem->alignment == UI_LAYOUT_ALIGN_RIGHT) {
        if (freew + fixedw > 0 && freew + fixedw < w) {
          offset = w - (fixedw + freew);
        }
      }
      else if (litem->alignment == UI_LAYOUT_ALIGN_CENTER) {
        if (freew + fixedw > 0 && freew + fixedw < w) {
          offset = (w - (fixedw + freew)) / 2;
        }
      }
  
      /* position item */
      ui_item_position(item, x + offset, y - itemh, itemw, itemh);
  
      x += itemw;
      if (item->next) {
        x += litem->space;
      }
    }
  
    /* add extra pixel */
    uiItem *last_item = litem->items.last;
    extra_pixel = litem->w - (x - litem->x);
    if (extra_pixel > 0 && litem->alignment == UI_LAYOUT_ALIGN_EXPAND && last_free_item &&
        last_item && last_item->flag & UI_ITEM_AUTO_FIXED_SIZE) {
      ui_item_move(last_free_item, 0, extra_pixel);
      for (item = last_free_item->next; item; item = item->next) {
        ui_item_move(item, extra_pixel, extra_pixel);
      }
    }
  
    litem->w = x - litem->x;
    litem->h = litem->y - y;
    litem->x = x;
    litem->y = y;
  }
  
  /* single-column layout */
  static void ui_litem_estimate_column(uiLayout *litem, bool is_box)
  {
    uiItem *item;
    int itemw, itemh;
    bool min_size_flag = true;
  
    litem->w = 0;
    litem->h = 0;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
  
      min_size_flag = min_size_flag && (item->flag & UI_ITEM_FIXED_SIZE);
  
      litem->w = MAX2(litem->w, itemw);
      litem->h += itemh;
  
      if (item->next && (!is_box || item != litem->items.first)) {
        litem->h += litem->space;
      }
    }
  
    if (min_size_flag) {
      litem->item.flag |= UI_ITEM_FIXED_SIZE;
    }
  }
  
  static void ui_litem_layout_column(uiLayout *litem, bool is_box)
  {
    uiItem *item;
    int itemh, x, y;
  
    x = litem->x;
    y = litem->y;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, NULL, &itemh);
  
      y -= itemh;
      ui_item_position(item, x, y, litem->w, itemh);
  
      if (item->next && (!is_box || item != litem->items.first)) {
        y -= litem->space;
      }
  
      if (is_box) {
        item->flag |= UI_ITEM_BOX_ITEM;
      }
    }
  
    litem->h = litem->y - y;
    litem->x = x;
    litem->y = y;
  }
  
  /* calculates the angle of a specified button in a radial menu,
   * stores a float vector in unit circle */
  static RadialDirection ui_get_radialbut_vec(float vec[2], short itemnum)
  {
    RadialDirection dir;
  
    if (itemnum >= PIE_MAX_ITEMS) {
      itemnum %= PIE_MAX_ITEMS;
      printf("Warning: Pie menus with more than %i items are currently unsupported\n",
             PIE_MAX_ITEMS);
    }
  
    dir = ui_radial_dir_order[itemnum];
    ui_but_pie_dir(dir, vec);
  
    return dir;
  }
  
  static bool ui_item_is_radial_displayable(uiItem *item)
  {
  
    if ((item->type == ITEM_BUTTON) && (((uiButtonItem *)item)->but->type == UI_BTYPE_LABEL)) {
      return false;
    }
  
    return true;
  }
  
  static bool ui_item_is_radial_drawable(uiButtonItem *bitem)
  {
  
    if (ELEM(bitem->but->type, UI_BTYPE_SEPR, UI_BTYPE_SEPR_LINE, UI_BTYPE_SEPR_SPACER)) {
      return false;
    }
  
    return true;
  }
  
  static void ui_litem_layout_radial(uiLayout *litem)
  {
    uiItem *item;
    int itemh, itemw, x, y;
    int itemnum = 0;
    int totitems = 0;
  
    /* For the radial layout we will use Matt Ebb's design
     * for radiation, see http://mattebb.com/weblog/radiation/
     * also the old code at http://developer.blender.org/T5103
     */
  
    int pie_radius = U.pie_menu_radius * UI_DPI_FAC;
  
    x = litem->x;
    y = litem->y;
  
    int minx = x, miny = y, maxx = x, maxy = y;
  
    /* first count total items */
    for (item = litem->items.first; item; item = item->next) {
      totitems++;
    }
  
    if (totitems < 5) {
      litem->root->block->pie_data.flags |= UI_PIE_DEGREES_RANGE_LARGE;
    }
  
    for (item = litem->items.first; item; item = item->next) {
      /* not all button types are drawn in a radial menu, do filtering here */
      if (ui_item_is_radial_displayable(item)) {
        RadialDirection dir;
        float vec[2];
        float factor[2];
  
        dir = ui_get_radialbut_vec(vec, itemnum);
        factor[0] = (vec[0] > 0.01f) ? 0.0f : ((vec[0] < -0.01f) ? -1.0f : -0.5f);
        factor[1] = (vec[1] > 0.99f) ? 0.0f : ((vec[1] < -0.99f) ? -1.0f : -0.5f);
  
        itemnum++;
  
        if (item->type == ITEM_BUTTON) {
          uiButtonItem *bitem = (uiButtonItem *)item;
  
          bitem->but->pie_dir = dir;
          /* scale the buttons */
          bitem->but->rect.ymax *= 1.5f;
          /* add a little bit more here to include number */
          bitem->but->rect.xmax += 1.5f * UI_UNIT_X;
          /* enable drawing as pie item if supported by widget */
          if (ui_item_is_radial_drawable(bitem)) {
            bitem->but->dt = UI_EMBOSS_RADIAL;
            bitem->but->drawflag |= UI_BUT_ICON_LEFT;
          }
        }
  
        ui_item_size(item, &itemw, &itemh);
  
        ui_item_position(item,
                         x + vec[0] * pie_radius + factor[0] * itemw,
                         y + vec[1] * pie_radius + factor[1] * itemh,
                         itemw,
                         itemh);
  
        minx = min_ii(minx, x + vec[0] * pie_radius - itemw / 2);
        maxx = max_ii(maxx, x + vec[0] * pie_radius + itemw / 2);
        miny = min_ii(miny, y + vec[1] * pie_radius - itemh / 2);
        maxy = max_ii(maxy, y + vec[1] * pie_radius + itemh / 2);
      }
    }
  
    litem->x = minx;
    litem->y = miny;
    litem->w = maxx - minx;
    litem->h = maxy - miny;
  }
  
  /* root layout */
  static void ui_litem_estimate_root(uiLayout *UNUSED(litem))
  {
    /* nothing to do */
  }
  
  static void ui_litem_layout_root_radial(uiLayout *litem)
  {
    /* first item is pie menu title, align on center of menu */
    uiItem *item = litem->items.first;
  
    if (item->type == ITEM_BUTTON) {
      int itemh, itemw, x, y;
      x = litem->x;
      y = litem->y;
  
      ui_item_size(item, &itemw, &itemh);
  
      ui_item_position(
          item, x - itemw / 2, y + U.dpi_fac * (U.pie_menu_threshold + 9.0f), itemw, itemh);
    }
  }
  
  static void ui_litem_layout_root(uiLayout *litem)
  {
    if (litem->root->type == UI_LAYOUT_HEADER) {
      ui_litem_layout_row(litem);
    }
    else if (litem->root->type == UI_LAYOUT_PIEMENU) {
      ui_litem_layout_root_radial(litem);
    }
    else {
      ui_litem_layout_column(litem, false);
    }
  }
  
  /* box layout */
  static void ui_litem_estimate_box(uiLayout *litem)
  {
    const uiStyle *style = litem->root->style;
  
    ui_litem_estimate_column(litem, true);
  
    int boxspace = style->boxspace;
    if (litem->root->type == UI_LAYOUT_HEADER) {
      boxspace = 0;
    }
    litem->w += 2 * boxspace;
    litem->h += 2 * boxspace;
  }
  
  static void ui_litem_layout_box(uiLayout *litem)
  {
    uiLayoutItemBx *box = (uiLayoutItemBx *)litem;
    const uiStyle *style = litem->root->style;
    uiBut *but;
    int w, h;
  
    int boxspace = style->boxspace;
    if (litem->root->type == UI_LAYOUT_HEADER) {
      boxspace = 0;
    }
  
    w = litem->w;
    h = litem->h;
  
    litem->x += boxspace;
    litem->y -= boxspace;
  
    if (w != 0) {
      litem->w -= 2 * boxspace;
    }
    if (h != 0) {
      litem->h -= 2 * boxspace;
    }
  
    ui_litem_layout_column(litem, true);
  
    litem->x -= boxspace;
    litem->y -= boxspace;
  
    if (w != 0) {
      litem->w += 2 * boxspace;
    }
    if (h != 0) {
      litem->h += 2 * boxspace;
    }
  
    /* roundbox around the sublayout */
    but = box->roundbox;
    but->rect.xmin = litem->x;
    but->rect.ymin = litem->y;
    but->rect.xmax = litem->x + litem->w;
    but->rect.ymax = litem->y + litem->h;
  }
  
  /* multi-column layout, automatically flowing to the next */
  static void ui_litem_estimate_column_flow(uiLayout *litem)
  {
    const uiStyle *style = litem->root->style;
    uiLayoutItemFlow *flow = (uiLayoutItemFlow *)litem;
    uiItem *item;
    int col, x, y, emh, emy, miny, itemw, itemh, maxw = 0;
    int toth, totitem;
  
    /* compute max needed width and total height */
    toth = 0;
    totitem = 0;
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
      maxw = MAX2(maxw, itemw);
      toth += itemh;
      totitem++;
    }
  
    if (flow->number <= 0) {
      /* auto compute number of columns, not very good */
      if (maxw == 0) {
        flow->totcol = 1;
        return;
      }
  
      flow->totcol = max_ii(litem->root->emw / maxw, 1);
      flow->totcol = min_ii(flow->totcol, totitem);
    }
    else {
      flow->totcol = flow->number;
    }
  
    /* compute sizes */
    x = 0;
    y = 0;
    emy = 0;
    miny = 0;
  
    maxw = 0;
    emh = toth / flow->totcol;
  
    /* create column per column */
    col = 0;
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
  
      y -= itemh + style->buttonspacey;
      miny = min_ii(miny, y);
      emy -= itemh;
      maxw = max_ii(itemw, maxw);
  
      /* decide to go to next one */
      if (col < flow->totcol - 1 && emy <= -emh) {
        x += maxw + litem->space;
        maxw = 0;
        y = 0;
        emy = 0; /* need to reset height again for next column */
        col++;
      }
    }
  
    litem->w = x;
    litem->h = litem->y - miny;
  }
  
  static void ui_litem_layout_column_flow(uiLayout *litem)
  {
    const uiStyle *style = litem->root->style;
    uiLayoutItemFlow *flow = (uiLayoutItemFlow *)litem;
    uiItem *item;
    int col, x, y, w, emh, emy, miny, itemw, itemh;
    int toth, totitem;
  
    /* compute max needed width and total height */
    toth = 0;
    totitem = 0;
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
      toth += itemh;
      totitem++;
    }
  
    /* compute sizes */
    x = litem->x;
    y = litem->y;
    emy = 0;
    miny = 0;
  
    w = litem->w - (flow->totcol - 1) * style->columnspace;
    emh = toth / flow->totcol;
  
    /* create column per column */
    col = 0;
    w = (litem->w - (flow->totcol - 1) * style->columnspace) / flow->totcol;
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
  
      itemw = (litem->alignment == UI_LAYOUT_ALIGN_EXPAND) ? w : min_ii(w, itemw);
  
      y -= itemh;
      emy -= itemh;
      ui_item_position(item, x, y, itemw, itemh);
      y -= style->buttonspacey;
      miny = min_ii(miny, y);
  
      /* decide to go to next one */
      if (col < flow->totcol - 1 && emy <= -emh) {
        x += w + style->columnspace;
        y = litem->y;
        emy = 0; /* need to reset height again for next column */
        col++;
  
        const int remaining_width = litem->w - (x - litem->x);
        const int remaining_width_between_columns = (flow->totcol - col - 1) * style->columnspace;
        const int remaining_columns = flow->totcol - col;
        w = (remaining_width - remaining_width_between_columns) / remaining_columns;
      }
    }
  
    litem->h = litem->y - miny;
    litem->x = x;
    litem->y = miny;
  }
  
  /* multi-column and multi-row layout. */
  typedef struct UILayoutGridFlowInput {
    /* General layout control settings. */
    const bool row_major : 1;    /* Fill rows before columns */
    const bool even_columns : 1; /* All columns will have same width. */
    const bool even_rows : 1;    /* All rows will have same height. */
    const int space_x;           /* Space between columns. */
    const int space_y;           /* Space between rows. */
    /* Real data about current position and size of this layout item
     * (either estimated, or final values). */
    const int litem_w; /* Layout item width. */
    const int litem_x; /* Layout item X position. */
    const int litem_y; /* Layout item Y position. */
    /* Actual number of columns and rows to generate (computed from first pass usually). */
    const int tot_columns; /* Number of columns. */
    const int tot_rows;    /* Number of rows. */
  } UILayoutGridFlowInput;
  
  typedef struct UILayoutGridFlowOutput {
    int *tot_items; /* Total number of items in this grid layout. */
    /* Width / X pos data. */
    float *global_avg_w; /* Computed average width of the columns. */
    int *cos_x_array;    /* Computed X coordinate of each column. */
    int *widths_array;   /* Computed width of each column. */
    int *tot_w;          /* Computed total width. */
    /* Height / Y pos data. */
    int *global_max_h;  /* Computed height of the tallest item in the grid. */
    int *cos_y_array;   /* Computed Y coordinate of each column. */
    int *heights_array; /* Computed height of each column. */
    int *tot_h;         /* Computed total height. */
  } UILayoutGridFlowOutput;
  
  static void ui_litem_grid_flow_compute(ListBase *items,
                                         UILayoutGridFlowInput *parameters,
                                         UILayoutGridFlowOutput *results)
  {
    uiItem *item;
    int i;
  
    float tot_w = 0.0f, tot_h = 0.0f;
    float global_avg_w = 0.0f, global_totweight_w = 0.0f;
    int global_max_h = 0;
  
    float *avg_w = NULL, *totweight_w = NULL;
    int *max_h = NULL;
  
    BLI_assert(
        parameters->tot_columns != 0 ||
        (results->cos_x_array == NULL && results->widths_array == NULL && results->tot_w == NULL));
    BLI_assert(
        parameters->tot_rows != 0 ||
        (results->cos_y_array == NULL && results->heights_array == NULL && results->tot_h == NULL));
  
    if (results->tot_items) {
      *results->tot_items = 0;
    }
  
    if (items->first == NULL) {
      if (results->global_avg_w) {
        *results->global_avg_w = 0.0f;
      }
      if (results->global_max_h) {
        *results->global_max_h = 0;
      }
      return;
    }
  
    if (parameters->tot_columns != 0) {
      avg_w = BLI_array_alloca(avg_w, parameters->tot_columns);
      totweight_w = BLI_array_alloca(totweight_w, parameters->tot_columns);
      memset(avg_w, 0, sizeof(*avg_w) * parameters->tot_columns);
      memset(totweight_w, 0, sizeof(*totweight_w) * parameters->tot_columns);
    }
    if (parameters->tot_rows != 0) {
      max_h = BLI_array_alloca(max_h, parameters->tot_rows);
      memset(max_h, 0, sizeof(*max_h) * parameters->tot_rows);
    }
  
    for (i = 0, item = items->first; item; item = item->next, i++) {
      int item_w, item_h;
      ui_item_size(item, &item_w, &item_h);
  
      global_avg_w += (float)(item_w * item_w);
      global_totweight_w += (float)item_w;
      global_max_h = max_ii(global_max_h, item_h);
  
      if (parameters->tot_rows != 0 && parameters->tot_columns != 0) {
        const int index_col = parameters->row_major ? i % parameters->tot_columns :
                                                      i / parameters->tot_rows;
        const int index_row = parameters->row_major ? i / parameters->tot_columns :
                                                      i % parameters->tot_rows;
  
        avg_w[index_col] += (float)(item_w * item_w);
        totweight_w[index_col] += (float)item_w;
  
        max_h[index_row] = max_ii(max_h[index_row], item_h);
      }
  
      if (results->tot_items) {
        (*results->tot_items)++;
      }
    }
  
    /* Finalize computing of column average sizes */
    global_avg_w /= global_totweight_w;
    if (parameters->tot_columns != 0) {
      for (i = 0; i < parameters->tot_columns; i++) {
        avg_w[i] /= totweight_w[i];
        tot_w += avg_w[i];
      }
      if (parameters->even_columns) {
        tot_w = ceilf(global_avg_w) * parameters->tot_columns;
      }
    }
    /* Finalize computing of rows max sizes */
    if (parameters->tot_rows != 0) {
      for (i = 0; i < parameters->tot_rows; i++) {
        tot_h += max_h[i];
      }
      if (parameters->even_rows) {
        tot_h = global_max_h * parameters->tot_columns;
      }
    }
  
    /* Compute positions and sizes of all cells. */
    if (results->cos_x_array != NULL && results->widths_array != NULL) {
      /* We enlarge/narrow columns evenly to match available width. */
      const float wfac = (float)(parameters->litem_w -
                                 (parameters->tot_columns - 1) * parameters->space_x) /
                         tot_w;
  
      for (int col = 0; col < parameters->tot_columns; col++) {
        results->cos_x_array[col] = (col ? results->cos_x_array[col - 1] +
                                               results->widths_array[col - 1] + parameters->space_x :
                                           parameters->litem_x);
        if (parameters->even_columns) {
          /* (< remaining width > - < space between remaining columns >) / < remaining columns > */
          results->widths_array[col] = (((parameters->litem_w -
                                          (results->cos_x_array[col] - parameters->litem_x)) -
                                         (parameters->tot_columns - col - 1) * parameters->space_x) /
                                        (parameters->tot_columns - col));
        }
        else if (col == parameters->tot_columns - 1) {
          /* Last column copes width rounding errors... */
          results->widths_array[col] = parameters->litem_w -
                                       (results->cos_x_array[col] - parameters->litem_x);
        }
        else {
          results->widths_array[col] = (int)(avg_w[col] * wfac);
        }
      }
    }
    if (results->cos_y_array != NULL && results->heights_array != NULL) {
      for (int row = 0; row < parameters->tot_rows; row++) {
        if (parameters->even_rows) {
          results->heights_array[row] = global_max_h;
        }
        else {
          results->heights_array[row] = max_h[row];
        }
        results->cos_y_array[row] = (row ? results->cos_y_array[row - 1] - parameters->space_y -
                                               results->heights_array[row] :
                                           parameters->litem_y - results->heights_array[row]);
      }
    }
  
    if (results->global_avg_w) {
      *results->global_avg_w = global_avg_w;
    }
    if (results->global_max_h) {
      *results->global_max_h = global_max_h;
    }
    if (results->tot_w) {
      *results->tot_w = (int)tot_w + parameters->space_x * (parameters->tot_columns - 1);
    }
    if (results->tot_h) {
      *results->tot_h = tot_h + parameters->space_y * (parameters->tot_rows - 1);
    }
  }
  
  static void ui_litem_estimate_grid_flow(uiLayout *litem)
  {
    const uiStyle *style = litem->root->style;
    uiLayoutItemGridFlow *gflow = (uiLayoutItemGridFlow *)litem;
  
    const int space_x = style->columnspace;
    const int space_y = style->buttonspacey;
  
    /* Estimate average needed width and height per item. */
    {
      float avg_w;
      int max_h;
  
      ui_litem_grid_flow_compute(&litem->items,
                                 &((UILayoutGridFlowInput){
                                     .row_major = gflow->row_major,
                                     .even_columns = gflow->even_columns,
                                     .even_rows = gflow->even_rows,
                                     .litem_w = litem->w,
                                     .litem_x = litem->x,
                                     .litem_y = litem->y,
                                     .space_x = space_x,
                                     .space_y = space_y,
                                 }),
                                 &((UILayoutGridFlowOutput){
                                     .tot_items = &gflow->tot_items,
                                     .global_avg_w = &avg_w,
                                     .global_max_h = &max_h,
                                 }));
  
      if (gflow->tot_items == 0) {
        litem->w = litem->h = 0;
        gflow->tot_columns = gflow->tot_rows = 0;
        return;
      }
  
      /* Even in varying column width case,
       * we fix our columns number from weighted average width of items,
       * a proper solving of required width would be too costly,
       * and this should give reasonably good results in all reasonable cases. */
      if (gflow->columns_len > 0) {
        gflow->tot_columns = gflow->columns_len;
      }
      else {
        if (avg_w == 0.0f) {
          gflow->tot_columns = 1;
        }
        else {
          gflow->tot_columns = min_ii(max_ii((int)(litem->w / avg_w), 1), gflow->tot_items);
        }
      }
      gflow->tot_rows = (int)ceilf((float)gflow->tot_items / gflow->tot_columns);
  
      /* Try to tweak number of columns and rows to get better filling of last column or row,
       * and apply 'modulo' value to number of columns or rows.
       * Note that modulo does not prevent ending with fewer columns/rows than modulo, if mandatory
       * to avoid empty column/row. */
      {
        const int modulo = (gflow->columns_len < -1) ? -gflow->columns_len : 0;
        const int step = modulo ? modulo : 1;
  
        if (gflow->row_major) {
          /* Adjust number of columns to be multiple of given modulo. */
          if (modulo && gflow->tot_columns % modulo != 0 && gflow->tot_columns > modulo) {
            gflow->tot_columns = gflow->tot_columns - (gflow->tot_columns % modulo);
          }
          /* Find smallest number of columns conserving computed optimal number of rows. */
          for (gflow->tot_rows = (int)ceilf((float)gflow->tot_items / gflow->tot_columns);
               (gflow->tot_columns - step) > 0 &&
               (int)ceilf((float)gflow->tot_items / (gflow->tot_columns - step)) <= gflow->tot_rows;
               gflow->tot_columns -= step) {
            /* pass */
          }
        }
        else {
          /* Adjust number of rows to be multiple of given modulo. */
          if (modulo && gflow->tot_rows % modulo != 0) {
            gflow->tot_rows = min_ii(gflow->tot_rows + modulo - (gflow->tot_rows % modulo),
                                     gflow->tot_items);
          }
          /* Find smallest number of rows conserving computed optimal number of columns. */
          for (gflow->tot_columns = (int)ceilf((float)gflow->tot_items / gflow->tot_rows);
               (gflow->tot_rows - step) > 0 &&
               (int)ceilf((float)gflow->tot_items / (gflow->tot_rows - step)) <= gflow->tot_columns;
               gflow->tot_rows -= step) {
            /* pass */
          }
        }
      }
  
      /* Set evenly-spaced axes size
       * (quick optimization in case we have even columns and rows). */
      if (gflow->even_columns && gflow->even_rows) {
        litem->w = (int)(gflow->tot_columns * avg_w) + space_x * (gflow->tot_columns - 1);
        litem->h = (int)(gflow->tot_rows * max_h) + space_y * (gflow->tot_rows - 1);
        return;
      }
    }
  
    /* Now that we have our final number of columns and rows,
     * we can compute actual needed space for non-evenly sized axes. */
    {
      int tot_w, tot_h;
  
      ui_litem_grid_flow_compute(&litem->items,
                                 &((UILayoutGridFlowInput){
                                     .row_major = gflow->row_major,
                                     .even_columns = gflow->even_columns,
                                     .even_rows = gflow->even_rows,
                                     .litem_w = litem->w,
                                     .litem_x = litem->x,
                                     .litem_y = litem->y,
                                     .space_x = space_x,
                                     .space_y = space_y,
                                     .tot_columns = gflow->tot_columns,
                                     .tot_rows = gflow->tot_rows,
                                 }),
                                 &((UILayoutGridFlowOutput){
                                     .tot_w = &tot_w,
                                     .tot_h = &tot_h,
                                 }));
  
      litem->w = tot_w;
      litem->h = tot_h;
    }
  }
  
  static void ui_litem_layout_grid_flow(uiLayout *litem)
  {
    int i;
    const uiStyle *style = litem->root->style;
    uiLayoutItemGridFlow *gflow = (uiLayoutItemGridFlow *)litem;
    uiItem *item;
  
    if (gflow->tot_items == 0) {
      litem->w = litem->h = 0;
      return;
    }
  
    BLI_assert(gflow->tot_columns > 0);
    BLI_assert(gflow->tot_rows > 0);
  
    const int space_x = style->columnspace;
    const int space_y = style->buttonspacey;
  
    int *widths = BLI_array_alloca(widths, gflow->tot_columns);
    int *heights = BLI_array_alloca(heights, gflow->tot_rows);
    int *cos_x = BLI_array_alloca(cos_x, gflow->tot_columns);
    int *cos_y = BLI_array_alloca(cos_y, gflow->tot_rows);
  
    /* This time we directly compute coordinates and sizes of all cells. */
    ui_litem_grid_flow_compute(&litem->items,
                               &((UILayoutGridFlowInput){
                                   .row_major = gflow->row_major,
                                   .even_columns = gflow->even_columns,
                                   .even_rows = gflow->even_rows,
                                   .litem_w = litem->w,
                                   .litem_x = litem->x,
                                   .litem_y = litem->y,
                                   .space_x = space_x,
                                   .space_y = space_y,
                                   .tot_columns = gflow->tot_columns,
                                   .tot_rows = gflow->tot_rows,
                               }),
                               &((UILayoutGridFlowOutput){
                                   .cos_x_array = cos_x,
                                   .cos_y_array = cos_y,
                                   .widths_array = widths,
                                   .heights_array = heights,
                               }));
  
    for (item = litem->items.first, i = 0; item; item = item->next, i++) {
      const int col = gflow->row_major ? i % gflow->tot_columns : i / gflow->tot_rows;
      const int row = gflow->row_major ? i / gflow->tot_columns : i % gflow->tot_rows;
      int item_w, item_h;
      ui_item_size(item, &item_w, &item_h);
  
      const int w = widths[col];
      const int h = heights[row];
  
      item_w = (litem->alignment == UI_LAYOUT_ALIGN_EXPAND) ? w : min_ii(w, item_w);
      item_h = (litem->alignment == UI_LAYOUT_ALIGN_EXPAND) ? h : min_ii(h, item_h);
  
      ui_item_position(item, cos_x[col], cos_y[row], item_w, item_h);
    }
  
    litem->h = litem->y - cos_y[gflow->tot_rows - 1];
    litem->x = (cos_x[gflow->tot_columns - 1] - litem->x) + widths[gflow->tot_columns - 1];
    litem->y = litem->y - litem->h;
  }
  
  /* free layout */
  static void ui_litem_estimate_absolute(uiLayout *litem)
  {
    uiItem *item;
    int itemx, itemy, itemw, itemh, minx, miny;
  
    minx = 1e6;
    miny = 1e6;
    litem->w = 0;
    litem->h = 0;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_offset(item, &itemx, &itemy);
      ui_item_size(item, &itemw, &itemh);
  
      minx = min_ii(minx, itemx);
      miny = min_ii(miny, itemy);
  
      litem->w = MAX2(litem->w, itemx + itemw);
      litem->h = MAX2(litem->h, itemy + itemh);
    }
  
    litem->w -= minx;
    litem->h -= miny;
  }
  
  static void ui_litem_layout_absolute(uiLayout *litem)
  {
    uiItem *item;
    float scalex = 1.0f, scaley = 1.0f;
    int x, y, newx, newy, itemx, itemy, itemh, itemw, minx, miny, totw, toth;
  
    minx = 1e6;
    miny = 1e6;
    totw = 0;
    toth = 0;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_offset(item, &itemx, &itemy);
      ui_item_size(item, &itemw, &itemh);
  
      minx = min_ii(minx, itemx);
      miny = min_ii(miny, itemy);
  
      totw = max_ii(totw, itemx + itemw);
      toth = max_ii(toth, itemy + itemh);
    }
  
    totw -= minx;
    toth -= miny;
  
    if (litem->w && totw > 0) {
      scalex = (float)litem->w / (float)totw;
    }
    if (litem->h && toth > 0) {
      scaley = (float)litem->h / (float)toth;
    }
  
    x = litem->x;
    y = litem->y - scaley * toth;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_offset(item, &itemx, &itemy);
      ui_item_size(item, &itemw, &itemh);
  
      if (scalex != 1.0f) {
        newx = (itemx - minx) * scalex;
        itemw = (itemx - minx + itemw) * scalex - newx;
        itemx = minx + newx;
      }
  
      if (scaley != 1.0f) {
        newy = (itemy - miny) * scaley;
        itemh = (itemy - miny + itemh) * scaley - newy;
        itemy = miny + newy;
      }
  
      ui_item_position(item, x + itemx - minx, y + itemy - miny, itemw, itemh);
    }
  
    litem->w = scalex * totw;
    litem->h = litem->y - y;
    litem->x = x + litem->w;
    litem->y = y;
  }
  
  /* split layout */
  static void ui_litem_estimate_split(uiLayout *litem)
  {
    ui_litem_estimate_row(litem);
    litem->item.flag &= ~UI_ITEM_FIXED_SIZE;
  }
  
  static void ui_litem_layout_split(uiLayout *litem)
  {
    uiLayoutItemSplit *split = (uiLayoutItemSplit *)litem;
    uiItem *item;
    float percentage, extra_pixel = 0.0f;
    const int tot = BLI_listbase_count(&litem->items);
    int itemh, x, y, w, colw = 0;
  
    if (tot == 0) {
      return;
    }
  
    x = litem->x;
    y = litem->y;
  
    percentage = (split->percentage == 0.0f) ? 1.0f / (float)tot : split->percentage;
  
    w = (litem->w - (tot - 1) * litem->space);
    colw = w * percentage;
    colw = MAX2(colw, 0);
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, NULL, &itemh);
  
      ui_item_position(item, x, y - itemh, colw, itemh);
      x += colw;
  
      if (item->next) {
        const float width = extra_pixel + (w - (int)(w * percentage)) / ((float)tot - 1);
        extra_pixel = width - (int)width;
        colw = (int)width;
        colw = MAX2(colw, 0);
  
        x += litem->space;
      }
    }
  
    litem->w = x - litem->x;
    litem->h = litem->y - y;
    litem->x = x;
    litem->y = y;
  }
  
  /* overlap layout */
  static void ui_litem_estimate_overlap(uiLayout *litem)
  {
    uiItem *item;
    int itemw, itemh;
  
    litem->w = 0;
    litem->h = 0;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
  
      litem->w = MAX2(itemw, litem->w);
      litem->h = MAX2(itemh, litem->h);
    }
  }
  
  static void ui_litem_layout_overlap(uiLayout *litem)
  {
    uiItem *item;
    int itemw, itemh, x, y;
  
    x = litem->x;
    y = litem->y;
  
    for (item = litem->items.first; item; item = item->next) {
      ui_item_size(item, &itemw, &itemh);
      ui_item_position(item, x, y - itemh, litem->w, itemh);
  
      litem->h = MAX2(litem->h, itemh);
    }
  
    litem->x = x;
    litem->y = y - litem->h;
  }
  
  static void ui_litem_init_from_parent(uiLayout *litem, uiLayout *layout, int align)
  {
    litem->root = layout->root;
    litem->align = align;
    /* Children of gridflow layout shall never have "ideal big size" returned as estimated size. */
    litem->variable_size = layout->variable_size || layout->item.type == ITEM_LAYOUT_GRID_FLOW;
    litem->active = true;
    litem->enabled = true;
    litem->context = layout->context;
    litem->redalert = layout->redalert;
    litem->w = layout->w;
    litem->emboss = layout->emboss;
    litem->item.flag = (layout->item.flag &
                        (UI_ITEM_PROP_SEP | UI_ITEM_PROP_DECORATE | UI_ITEM_INSIDE_PROP_SEP));
  
    if (layout->child_items_layout) {
      BLI_addtail(&layout->child_items_layout->items, litem);
      litem->parent = layout->child_items_layout;
    }
    else {
      BLI_addtail(&layout->items, litem);
      litem->parent = layout;
    }
  }
  
  static void ui_layout_heading_set(uiLayout *layout, const char *heading)
  {
    BLI_assert(layout->heading[0] == '\0');
    if (heading) {
      STRNCPY(layout->heading, heading);
    }
  }
  
  /* layout create functions */
  uiLayout *uiLayoutRow(uiLayout *layout, bool align)
  {
    uiLayout *litem;
  
    litem = MEM_callocN(sizeof(uiLayout), "uiLayoutRow");
    ui_litem_init_from_parent(litem, layout, align);
  
    litem->item.type = ITEM_LAYOUT_ROW;
    litem->space = (align) ? 0 : layout->root->style->buttonspacex;
  
    UI_block_layout_set_current(layout->root->block, litem);
  
    return litem;
  }
  
  /**
   * See #uiLayoutColumnWithHeading().
   */
  uiLayout *uiLayoutRowWithHeading(uiLayout *layout, bool align, const char *heading)
  {
    uiLayout *litem = uiLayoutRow(layout, align);
    ui_layout_heading_set(litem, heading);
    return litem;
  }
  
  uiLayout *uiLayoutColumn(uiLayout *layout, bool align)
  {
    uiLayout *litem;
  
    litem = MEM_callocN(sizeof(uiLayout), "uiLayoutColumn");
    ui_litem_init_from_parent(litem, layout, align);
  
    litem->item.type = ITEM_LAYOUT_COLUMN;
    litem->space = (align) ? 0 : layout->root->style->buttonspacey;
  
    UI_block_layout_set_current(layout->root->block, litem);
  
    return litem;
  }
  
  /**
   * Variant of #uiLayoutColumn() that sets a heading label for the layout if the first item is
   * added through #uiItemFullR(). If split layout is used and the item has no string to add to the
   * first split-column, the heading is added there instead. Otherwise the heading inserted with a
   * new row.
   */
  uiLayout *uiLayoutColumnWithHeading(uiLayout *layout, bool align, const char *heading)
  {
    uiLayout *litem = uiLayoutColumn(layout, align);
    ui_layout_heading_set(litem, heading);
    return litem;
  }
  
  uiLayout *uiLayoutColumnFlow(uiLayout *layout, int number, bool align)
  {
    uiLayoutItemFlow *flow;
  
    flow = MEM_callocN(sizeof(uiLayoutItemFlow), "uiLayoutItemFlow");
    ui_litem_init_from_parent(&flow->litem, layout, align);
  
    flow->litem.item.type = ITEM_LAYOUT_COLUMN_FLOW;
    flow->litem.space = (flow->litem.align) ? 0 : layout->root->style->columnspace;
    flow->number = number;
  
    UI_block_layout_set_current(layout->root->block, &flow->litem);
  
    return &flow->litem;
  }
  
  uiLayout *uiLayoutGridFlow(uiLayout *layout,
                             bool row_major,
                             int columns_len,
                             bool even_columns,
                             bool even_rows,
                             bool align)
  {
    uiLayoutItemGridFlow *flow;
  
    flow = MEM_callocN(sizeof(uiLayoutItemGridFlow), __func__);
    flow->litem.item.type = ITEM_LAYOUT_GRID_FLOW;
    ui_litem_init_from_parent(&flow->litem, layout, align);
  
    flow->litem.space = (flow->litem.align) ? 0 : layout->root->style->columnspace;
    flow->row_major = row_major;
    flow->columns_len = columns_len;
    flow->even_columns = even_columns;
    flow->even_rows = even_rows;
  
    UI_block_layout_set_current(layout->root->block, &flow->litem);
  
    return &flow->litem;
  }
  
  static uiLayoutItemBx *ui_layout_box(uiLayout *layout, int type)
  {
    uiLayoutItemBx *box;
  
    box = MEM_callocN(sizeof(uiLayoutItemBx), "uiLayoutItemBx");
    ui_litem_init_from_parent(&box->litem, layout, false);
  
    box->litem.item.type = ITEM_LAYOUT_BOX;
    box->litem.space = layout->root->style->columnspace;
  
    UI_block_layout_set_current(layout->root->block, &box->litem);
  
    box->roundbox = uiDefBut(layout->root->block, type, 0, "", 0, 0, 0, 0, NULL, 0.0, 0.0, 0, 0, "");
  
    return box;
  }
  
  uiLayout *uiLayoutRadial(uiLayout *layout)
  {
    uiLayout *litem;
    uiItem *item;
  
    /* radial layouts are only valid for radial menus */
    if (layout->root->type != UI_LAYOUT_PIEMENU) {
      return ui_item_local_sublayout(layout, layout, 0);
    }
  
    /* only one radial wheel per root layout is allowed, so check and return that, if it exists */
    for (item = layout->root->layout->items.first; item; item = item->next) {
      litem = (uiLayout *)item;
      if (litem->item.type == ITEM_LAYOUT_RADIAL) {
        UI_block_layout_set_current(layout->root->block, litem);
        return litem;
      }
    }
  
    litem = MEM_callocN(sizeof(uiLayout), "uiLayoutRadial");
    ui_litem_init_from_parent(litem, layout, false);
  
    litem->item.type = ITEM_LAYOUT_RADIAL;
  
    UI_block_layout_set_current(layout->root->block, litem);
  
    return litem;
  }
  
  uiLayout *uiLayoutBox(uiLayout *layout)
  {
    return (uiLayout *)ui_layout_box(layout, UI_BTYPE_ROUNDBOX);
  }
  
  /**
   * Check all buttons defined in this layout,
   * and set any button flagged as UI_BUT_LIST_ITEM as active/selected.
   * Needed to handle correctly text colors of active (selected) list item.
   */
  void ui_layout_list_set_labels_active(uiLayout *layout)
  {
    uiButtonItem *bitem;
    for (bitem = layout->items.first; bitem; bitem = bitem->item.next) {
      if (bitem->item.type != ITEM_BUTTON) {
        ui_layout_list_set_labels_active((uiLayout *)(&bitem->item));
      }
      else if (bitem->but->flag & UI_BUT_LIST_ITEM) {
        UI_but_flag_enable(bitem->but, UI_SELECT);
      }
    }
  }
  
  uiLayout *uiLayoutListBox(uiLayout *layout,
                            uiList *ui_list,
                            PointerRNA *ptr,
                            PropertyRNA *prop,
                            PointerRNA *actptr,
                            PropertyRNA *actprop)
  {
    uiLayoutItemBx *box = ui_layout_box(layout, UI_BTYPE_LISTBOX);
    uiBut *but = box->roundbox;
  
    but->custom_data = ui_list;
  
    but->rnasearchpoin = *ptr;
    but->rnasearchprop = prop;
    but->rnapoin = *actptr;
    but->rnaprop = actprop;
  
    /* only for the undo string */
    if (but->flag & UI_BUT_UNDO) {
      but->tip = RNA_property_description(actprop);
    }
  
    return (uiLayout *)box;
  }
  
  uiLayout *uiLayoutAbsolute(uiLayout *layout, bool align)
  {
    uiLayout *litem;
  
    litem = MEM_callocN(sizeof(uiLayout), "uiLayoutAbsolute");
    ui_litem_init_from_parent(litem, layout, align);
  
    litem->item.type = ITEM_LAYOUT_ABSOLUTE;
  
    UI_block_layout_set_current(layout->root->block, litem);
  
    return litem;
  }
  
  uiBlock *uiLayoutAbsoluteBlock(uiLayout *layout)
  {
    uiBlock *block;
  
    block = uiLayoutGetBlock(layout);
    uiLayoutAbsolute(layout, false);
  
    return block;
  }
  
  uiLayout *uiLayoutOverlap(uiLayout *layout)
  {
    uiLayout *litem;
  
    litem = MEM_callocN(sizeof(uiLayout), "uiLayoutOverlap");
    ui_litem_init_from_parent(litem, layout, false);
  
    litem->item.type = ITEM_LAYOUT_OVERLAP;
  
    UI_block_layout_set_current(layout->root->block, litem);
  
    return litem;
  }
  
  uiLayout *uiLayoutSplit(uiLayout *layout, float percentage, bool align)
  {
    uiLayoutItemSplit *split;
  
    split = MEM_callocN(sizeof(uiLayoutItemSplit), "uiLayoutItemSplit");
    ui_litem_init_from_parent(&split->litem, layout, align);
  
    split->litem.item.type = ITEM_LAYOUT_SPLIT;
    split->litem.space = layout->root->style->columnspace;
    split->percentage = percentage;
  
    UI_block_layout_set_current(layout->root->block, &split->litem);
  
    return &split->litem;
  }
  
  void uiLayoutSetActive(uiLayout *layout, bool active)
  {
    layout->active = active;
  }
  
  void uiLayoutSetActiveDefault(uiLayout *layout, bool active_default)
  {
    layout->active_default = active_default;
  }
  
  void uiLayoutSetActivateInit(uiLayout *layout, bool activate_init)
  {
    layout->activate_init = activate_init;
  }
  
  void uiLayoutSetEnabled(uiLayout *layout, bool enabled)
  {
    layout->enabled = enabled;
  }
  
  void uiLayoutSetRedAlert(uiLayout *layout, bool redalert)
  {
    layout->redalert = redalert;
  }
  
  void uiLayoutSetKeepAspect(uiLayout *layout, bool keepaspect)
  {
    layout->keepaspect = keepaspect;
  }
  
  void uiLayoutSetAlignment(uiLayout *layout, char alignment)
  {
    layout->alignment = alignment;
  }
  
  void uiLayoutSetScaleX(uiLayout *layout, float scale)
  {
    layout->scale[0] = scale;
  }
  
  void uiLayoutSetScaleY(uiLayout *layout, float scale)
  {
    layout->scale[1] = scale;
  }
  
  void uiLayoutSetUnitsX(uiLayout *layout, float unit)
  {
    layout->units[0] = unit;
  }
  
  void uiLayoutSetUnitsY(uiLayout *layout, float unit)
  {
    layout->units[1] = unit;
  }
  
  void uiLayoutSetEmboss(uiLayout *layout, char emboss)
  {
    layout->emboss = emboss;
  }
  
  bool uiLayoutGetPropSep(uiLayout *layout)
  {
    return (layout->item.flag & UI_ITEM_PROP_SEP) != 0;
  }
  
  void uiLayoutSetPropSep(uiLayout *layout, bool is_sep)
  {
    SET_FLAG_FROM_TEST(layout->item.flag, is_sep, UI_ITEM_PROP_SEP);
  }
  
  bool uiLayoutGetPropDecorate(uiLayout *layout)
  {
    return (layout->item.flag & UI_ITEM_PROP_DECORATE) != 0;
  }
  
  void uiLayoutSetPropDecorate(uiLayout *layout, bool is_sep)
  {
    SET_FLAG_FROM_TEST(layout->item.flag, is_sep, UI_ITEM_PROP_DECORATE);
  }
  
  bool uiLayoutGetActive(uiLayout *layout)
  {
    return layout->active;
  }
  
  bool uiLayoutGetActiveDefault(uiLayout *layout)
  {
    return layout->active_default;
  }
  
  bool uiLayoutGetActivateInit(uiLayout *layout)
  {
    return layout->activate_init;
  }
  
  bool uiLayoutGetEnabled(uiLayout *layout)
  {
    return layout->enabled;
  }
  
  bool uiLayoutGetRedAlert(uiLayout *layout)
  {
    return layout->redalert;
  }
  
  bool uiLayoutGetKeepAspect(uiLayout *layout)
  {
    return layout->keepaspect;
  }
  
  int uiLayoutGetAlignment(uiLayout *layout)
  {
    return layout->alignment;
  }
  
  int uiLayoutGetWidth(uiLayout *layout)
  {
    return layout->w;
  }
  
  float uiLayoutGetScaleX(uiLayout *layout)
  {
    return layout->scale[0];
  }
  
  float uiLayoutGetScaleY(uiLayout *layout)
  {
    return layout->scale[1];
  }
  
  float uiLayoutGetUnitsX(uiLayout *layout)
  {
    return layout->units[0];
  }
  
  float uiLayoutGetUnitsY(uiLayout *layout)
  {
    return layout->units[1];
  }
  
  int uiLayoutGetEmboss(uiLayout *layout)
  {
    if (layout->emboss == UI_EMBOSS_UNDEFINED) {
      return layout->root->block->dt;
    }
    else {
      return layout->emboss;
    }
  }
  
  /** \} */
  
  /* -------------------------------------------------------------------- */
  /** \name Layout
   * \{ */
  
  static void ui_item_scale(uiLayout *litem, const float scale[2])
  {
    uiItem *item;
    int x, y, w, h;
  
    for (item = litem->items.last; item; item = item->prev) {
      if (item->type != ITEM_BUTTON) {
        uiLayout *subitem = (uiLayout *)item;
        ui_item_scale(subitem, scale);
      }
  
      ui_item_size(item, &w, &h);
      ui_item_offset(item, &x, &y);
  
      if (scale[0] != 0.0f) {
        x *= scale[0];
        w *= scale[0];
      }
  
      if (scale[1] != 0.0f) {
        y *= scale[1];
        h *= scale[1];
      }
  
      ui_item_position(item, x, y, w, h);
    }
  }
  
  static void ui_item_estimate(uiItem *item)
  {
    uiItem *subitem;
  
    if (item->type != ITEM_BUTTON) {
      uiLayout *litem = (uiLayout *)item;
  
      for (subitem = litem->items.first; subitem; subitem = subitem->next) {
        ui_item_estimate(subitem);
      }
  
      if (BLI_listbase_is_empty(&litem->items)) {
        litem->w = 0;
        litem->h = 0;
        return;
      }
  
      if (litem->scale[0] != 0.0f || litem->scale[1] != 0.0f) {
        ui_item_scale(litem, litem->scale);
      }
  
      switch (litem->item.type) {
        case ITEM_LAYOUT_COLUMN:
          ui_litem_estimate_column(litem, false);
          break;
        case ITEM_LAYOUT_COLUMN_FLOW:
          ui_litem_estimate_column_flow(litem);
          break;
        case ITEM_LAYOUT_GRID_FLOW:
          ui_litem_estimate_grid_flow(litem);
          break;
        case ITEM_LAYOUT_ROW:
          ui_litem_estimate_row(litem);
          break;
        case ITEM_LAYOUT_BOX:
          ui_litem_estimate_box(litem);
          break;
        case ITEM_LAYOUT_ROOT:
          ui_litem_estimate_root(litem);
          break;
        case ITEM_LAYOUT_ABSOLUTE:
          ui_litem_estimate_absolute(litem);
          break;
        case ITEM_LAYOUT_SPLIT:
          ui_litem_estimate_split(litem);
          break;
        case ITEM_LAYOUT_OVERLAP:
          ui_litem_estimate_overlap(litem);
          break;
        default:
          break;
      }
  
      /* Force fixed size. */
      if (litem->units[0] > 0) {
        litem->w = UI_UNIT_X * litem->units[0];
      }
      if (litem->units[1] > 0) {
        litem->h = UI_UNIT_Y * litem->units[1];
      }
    }
  }
  
  static void ui_item_align(uiLayout *litem, short nr)
  {
    uiItem *item;
    uiButtonItem *bitem;
    uiLayoutItemBx *box;
  
    for (item = litem->items.last; item; item = item->prev) {
      if (item->type == ITEM_BUTTON) {
        bitem = (uiButtonItem *)item;
  #ifndef USE_UIBUT_SPATIAL_ALIGN
        if (ui_but_can_align(bitem->but))
  #endif
        {
          if (!bitem->but->alignnr) {
            bitem->but->alignnr = nr;
          }
        }
      }
      else if (item->type == ITEM_LAYOUT_ABSOLUTE) {
        /* pass */
      }
      else if (item->type == ITEM_LAYOUT_OVERLAP) {
        /* pass */
      }
      else if (item->type == ITEM_LAYOUT_BOX) {
        box = (uiLayoutItemBx *)item;
        if (!box->roundbox->alignnr) {
          box->roundbox->alignnr = nr;
        }
      }
      else if (((uiLayout *)item)->align) {
        ui_item_align((uiLayout *)item, nr);
      }
    }
  }
  
  static void ui_item_flag(uiLayout *litem, int flag)
  {
    uiItem *item;
    uiButtonItem *bitem;
  
    for (item = litem->items.last; item; item = item->prev) {
      if (item->type == ITEM_BUTTON) {
        bitem = (uiButtonItem *)item;
        bitem->but->flag |= flag;
      }
      else {
        ui_item_flag((uiLayout *)item, flag);
      }
    }
  }
  
  static void ui_item_layout(uiItem *item)
  {
    uiItem *subitem;
  
    if (item->type != ITEM_BUTTON) {
      uiLayout *litem = (uiLayout *)item;
  
      if (BLI_listbase_is_empty(&litem->items)) {
        return;
      }
  
      if (litem->align) {
        ui_item_align(litem, ++litem->root->block->alignnr);
      }
      if (!litem->active) {
        ui_item_flag(litem, UI_BUT_INACTIVE);
      }
      if (!litem->enabled) {
        ui_item_flag(litem, UI_BUT_DISABLED);
      }
  
      switch (litem->item.type) {
        case ITEM_LAYOUT_COLUMN:
          ui_litem_layout_column(litem, false);
          break;
        case ITEM_LAYOUT_COLUMN_FLOW:
          ui_litem_layout_column_flow(litem);
          break;
        case ITEM_LAYOUT_GRID_FLOW:
          ui_litem_layout_grid_flow(litem);
          break;
        case ITEM_LAYOUT_ROW:
          ui_litem_layout_row(litem);
          break;
        case ITEM_LAYOUT_BOX:
          ui_litem_layout_box(litem);
          break;
        case ITEM_LAYOUT_ROOT:
          ui_litem_layout_root(litem);
          break;
        case ITEM_LAYOUT_ABSOLUTE:
          ui_litem_layout_absolute(litem);
          break;
        case ITEM_LAYOUT_SPLIT:
          ui_litem_layout_split(litem);
          break;
        case ITEM_LAYOUT_OVERLAP:
          ui_litem_layout_overlap(litem);
          break;
        case ITEM_LAYOUT_RADIAL:
          ui_litem_layout_radial(litem);
          break;
        default:
          break;
      }
  
      for (subitem = litem->items.first; subitem; subitem = subitem->next) {
        if (item->flag & UI_ITEM_BOX_ITEM) {
          subitem->flag |= UI_ITEM_BOX_ITEM;
        }
        ui_item_layout(subitem);
      }
    }
    else {
      if (item->flag & UI_ITEM_BOX_ITEM) {
        uiButtonItem *bitem = (uiButtonItem *)item;
        bitem->but->drawflag |= UI_BUT_BOX_ITEM;
      }
    }
  }
  
  static void ui_layout_end(uiBlock *block, uiLayout *layout, int *r_x, int *r_y)
  {
    if (layout->root->handlefunc) {
      UI_block_func_handle_set(block, layout->root->handlefunc, layout->root->argv);
    }
  
    ui_item_estimate(&layout->item);
    ui_item_layout(&layout->item);
  
    if (r_x) {
      *r_x = layout->x;
    }
    if (r_y) {
      *r_y = layout->y;
    }
  }
  
  static void ui_layout_free(uiLayout *layout)
  {
    uiItem *item, *next;
  
    for (item = layout->items.first; item; item = next) {
      next = item->next;
  
      if (item->type == ITEM_BUTTON) {
        MEM_freeN(item);
      }
      else {
        ui_layout_free((uiLayout *)item);
      }
    }
  
    MEM_freeN(layout);
  }
  
  static void ui_layout_add_padding_button(uiLayoutRoot *root)
  {
    if (root->padding) {
      /* add an invisible button for padding */
      uiBlock *block = root->block;
      uiLayout *prev_layout = block->curlayout;
  
      block->curlayout = root->layout;
      uiDefBut(
          block, UI_BTYPE_SEPR, 0, "", 0, 0, root->padding, root->padding, NULL, 0.0, 0.0, 0, 0, "");
      block->curlayout = prev_layout;
    }
  }
  
  uiLayout *UI_block_layout(uiBlock *block,
                            int dir,
                            int type,
                            int x,
                            int y,
                            int size,
                            int em,
                            int padding,
                            const uiStyle *style)
  {
    uiLayout *layout;
    uiLayoutRoot *root;
  
    root = MEM_callocN(sizeof(uiLayoutRoot), "uiLayoutRoot");
    root->type = type;
    root->style = style;
    root->block = block;
    root->padding = padding;
    root->opcontext = WM_OP_INVOKE_REGION_WIN;
  
    layout = MEM_callocN(sizeof(uiLayout), "uiLayout");
    layout->item.type = (type == UI_LAYOUT_VERT_BAR) ? ITEM_LAYOUT_COLUMN : ITEM_LAYOUT_ROOT;
  
    /* Only used when 'UI_ITEM_PROP_SEP' is set. */
    layout->item.flag = UI_ITEM_PROP_DECORATE;
  
    layout->x = x;
    layout->y = y;
    layout->root = root;
    layout->space = style->templatespace;
    layout->active = 1;
    layout->enabled = 1;
    layout->context = NULL;
    layout->emboss = UI_EMBOSS_UNDEFINED;
  
    if (type == UI_LAYOUT_MENU || type == UI_LAYOUT_PIEMENU) {
      layout->space = 0;
    }
  
    if (dir == UI_LAYOUT_HORIZONTAL) {
      layout->h = size;
      layout->root->emh = em * UI_UNIT_Y;
    }
    else {
      layout->w = size;
      layout->root->emw = em * UI_UNIT_X;
    }
  
    block->curlayout = layout;
    root->layout = layout;
    BLI_addtail(&block->layouts, root);
  
    ui_layout_add_padding_button(root);
  
    return layout;
  }
  
  uiBlock *uiLayoutGetBlock(uiLayout *layout)
  {
    return layout->root->block;
  }
  
  int uiLayoutGetOperatorContext(uiLayout *layout)
  {
    return layout->root->opcontext;
  }
  
  void UI_block_layout_set_current(uiBlock *block, uiLayout *layout)
  {
    block->curlayout = layout;
  }
  
  void ui_layout_add_but(uiLayout *layout, uiBut *but)
  {
    uiButtonItem *bitem;
  
    bitem = MEM_callocN(sizeof(uiButtonItem), "uiButtonItem");
    bitem->item.type = ITEM_BUTTON;
    bitem->but = but;
  
    int w, h;
    ui_item_size((uiItem *)bitem, &w, &h);
    /* XXX uiBut hasn't scaled yet
     * we can flag the button as not expandable, depending on its size */
    if (w <= 2 * UI_UNIT_X && (!but->str || but->str[0] == '\0')) {
      bitem->item.flag |= UI_ITEM_FIXED_SIZE;
    }
  
    if (layout->child_items_layout) {
      BLI_addtail(&layout->child_items_layout->items, bitem);
    }
    else {
      BLI_addtail(&layout->items, bitem);
    }
  
    if (layout->context) {
      but->context = layout->context;
      but->context->used = true;
    }
  
    if (layout->emboss != UI_EMBOSS_UNDEFINED) {
      but->dt = layout->emboss;
    }
  }
  
  void uiLayoutSetFixedSize(uiLayout *layout, bool fixed_size)
  {
    if (fixed_size) {
      layout->item.flag |= UI_ITEM_FIXED_SIZE;
    }
    else {
      layout->item.flag &= ~UI_ITEM_FIXED_SIZE;
    }
  }
  
  bool uiLayoutGetFixedSize(uiLayout *layout)
  {
    return (layout->item.flag & UI_ITEM_FIXED_SIZE) != 0;
  }
  
  void uiLayoutSetOperatorContext(uiLayout *layout, int opcontext)
  {
    layout->root->opcontext = opcontext;
  }
  
  void uiLayoutSetFunc(uiLayout *layout, uiMenuHandleFunc handlefunc, void *argv)
  {
    layout->root->handlefunc = handlefunc;
    layout->root->argv = argv;
  }
  
  void UI_block_layout_resolve(uiBlock *block, int *r_x, int *r_y)
  {
    uiLayoutRoot *root;
  
    BLI_assert(block->active);
  
    if (r_x) {
      *r_x = 0;
    }
    if (r_y) {
      *r_y = 0;
    }
  
    block->curlayout = NULL;
  
    for (root = block->layouts.first; root; root = root->next) {
      ui_layout_add_padding_button(root);
  
      /* NULL in advance so we don't interfere when adding button */
      ui_layout_end(block, root->layout, r_x, r_y);
      ui_layout_free(root->layout);
    }
  
    BLI_freelistN(&block->layouts);
  
    /* XXX silly trick, interface_templates.c doesn't get linked
     * because it's not used by other files in this module? */
    {
      UI_template_fix_linking();
    }
  }
  
  void uiLayoutSetContextPointer(uiLayout *layout, const char *name, PointerRNA *ptr)
  {
    uiBlock *block = layout->root->block;
    layout->context = CTX_store_add(&block->contexts, name, ptr);
  }
  
  void uiLayoutContextCopy(uiLayout *layout, bContextStore *context)
  {
    uiBlock *block = layout->root->block;
    layout->context = CTX_store_add_all(&block->contexts, context);
  }
  
  void uiLayoutSetContextFromBut(uiLayout *layout, uiBut *but)
  {
    if (but->opptr) {
      uiLayoutSetContextPointer(layout, "button_operator", but->opptr);
    }
  
    if (but->rnapoin.data && but->rnaprop) {
      /* TODO: index could be supported as well */
      PointerRNA ptr_prop;
      RNA_pointer_create(NULL, &RNA_Property, but->rnaprop, &ptr_prop);
      uiLayoutSetContextPointer(layout, "button_prop", &ptr_prop);
      uiLayoutSetContextPointer(layout, "button_pointer", &but->rnapoin);
    }
  }
  
  /* this is a bit of a hack but best keep it in one place at least */
  MenuType *UI_but_menutype_get(uiBut *but)
  {
    if (but->menu_create_func == ui_item_menutype_func) {
      return (MenuType *)but->poin;
    }
    else {
      return NULL;
    }
  }
  
  /* this is a bit of a hack but best keep it in one place at least */
  PanelType *UI_but_paneltype_get(uiBut *but)
  {
    if (but->menu_create_func == ui_item_paneltype_func) {
      return (PanelType *)but->poin;
    }
    else {
      return NULL;
    }
  }
  
  void UI_menutype_draw(bContext *C, MenuType *mt, struct uiLayout *layout)
  {
    Menu menu = {
        .layout = layout,
        .type = mt,
    };
  
    if (G.debug & G_DEBUG_WM) {
      printf("%s: opening menu \"%s\"\n", __func__, mt->idname);
    }
  
    if (layout->context) {
      CTX_store_set(C, layout->context);
    }
  
    mt->draw(C, &menu);
  
    if (layout->context) {
      CTX_store_set(C, NULL);
    }
  }
  
  static void ui_paneltype_draw_impl(bContext *C, PanelType *pt, uiLayout *layout, bool show_header)
  {
    Panel *panel = MEM_callocN(sizeof(Panel), "popover panel");
    panel->type = pt;
    panel->flag = PNL_POPOVER;
  
    uiLayout *last_item = layout->items.last;
  
    /* Draw main panel. */
    if (show_header) {
      uiLayout *row = uiLayoutRow(layout, false);
      if (pt->draw_header) {
        panel->layout = row;
        pt->draw_header(C, panel);
        panel->layout = NULL;
      }
      uiItemL(row, CTX_IFACE_(pt->translation_context, pt->label), ICON_NONE);
    }
  
    panel->layout = layout;
    pt->draw(C, panel);
    panel->layout = NULL;
  
    MEM_freeN(panel);
  
    /* Draw child panels. */
    LISTBASE_FOREACH (LinkData *, link, &pt->children) {
      PanelType *child_pt = link->data;
  
      if (child_pt->poll == NULL || child_pt->poll(C, child_pt)) {
        /* Add space if something was added to the layout. */
        if (last_item != layout->items.last) {
          uiItemS(layout);
          last_item = layout->items.last;
        }
  
        uiLayout *col = uiLayoutColumn(layout, false);
        ui_paneltype_draw_impl(C, child_pt, col, true);
      }
    }
  }
  
  /**
   * Used for popup panels only.
   */
  void UI_paneltype_draw(bContext *C, PanelType *pt, uiLayout *layout)
  {
    if (layout->context) {
      CTX_store_set(C, layout->context);
    }
  
    ui_paneltype_draw_impl(C, pt, layout, false);
  
    if (layout->context) {
      CTX_store_set(C, NULL);
    }
  }
  
  /** \} */
  