text: /*
   * vim:ts=4:sw=4:expandtab
   *
   * i3 - an improved dynamic tiling window manager
   * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
   *
   * floating.c: Floating windows.
   *
   */
  #include "all.h"
  
  #ifndef MAX
  #define MAX(x, y) ((x) > (y) ? (x) : (y))
  #endif
  
  /*
   * Calculates sum of heights and sum of widths of all currently active outputs
   *
   */
  static Rect total_outputs_dimensions(void) {
      if (TAILQ_EMPTY(&outputs))
          return (Rect){0, 0, root_screen->width_in_pixels, root_screen->height_in_pixels};
  
      Output *output;
      /* Use Rect to encapsulate dimensions, ignoring x/y */
      Rect outputs_dimensions = {0, 0, 0, 0};
      TAILQ_FOREACH(output, &outputs, outputs) {
          outputs_dimensions.height += output->rect.height;
          outputs_dimensions.width += output->rect.width;
      }
      return outputs_dimensions;
  }
  
  /*
   * Updates I3_FLOATING_WINDOW by either setting or removing it on the con and
   * all its children.
   *
   */
  static void floating_set_hint_atom(Con *con, bool floating) {
      if (!con_is_leaf(con)) {
          Con *child;
          TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
              floating_set_hint_atom(child, floating);
          }
      }
  
      if (con->window == NULL) {
          return;
      }
  
      if (floating) {
          uint32_t val = 1;
          xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->window->id,
                              A_I3_FLOATING_WINDOW, XCB_ATOM_CARDINAL, 32, 1, &val);
      } else {
          xcb_delete_property(conn, con->window->id, A_I3_FLOATING_WINDOW);
      }
  
      xcb_flush(conn);
  }
  
  /*
   * Called when a floating window is created or resized.  This function resizes
   * the window if its size is higher or lower than the configured maximum/minimum
   * size, respectively or when adjustments are needed to conform to the
   * configured size increments or aspect ratio limits.
   *
   * When prefer_height is true and the window needs to be resized because of the
   * configured aspect ratio, the width is adjusted first, preserving the previous
   * height.
   *
   */
  void floating_check_size(Con *floating_con, bool prefer_height) {
      /* Define reasonable minimal and maximal sizes for floating windows */
      const int floating_sane_min_height = 50;
      const int floating_sane_min_width = 75;
      Rect floating_sane_max_dimensions;
      Con *focused_con = con_descend_focused(floating_con);
  
      Rect border_rect = con_border_style_rect(focused_con);
      /* We have to do the opposite calculations that render_con() do
       * to get the exact size we want. */
      border_rect.width = -border_rect.width;
      border_rect.width += 2 * focused_con->border_width;
      border_rect.height = -border_rect.height;
      border_rect.height += 2 * focused_con->border_width;
      if (con_border_style(focused_con) == BS_NORMAL) {
          border_rect.height += render_deco_height();
      }
  
      i3Window *window = focused_con->window;
      if (window != NULL) {
          /* ICCCM says: If a base size is not provided, the minimum size is to be used in its place
           * and vice versa. */
          int min_width = (window->min_width ? window->min_width : window->base_width);
          int min_height = (window->min_height ? window->min_height : window->base_height);
          int base_width = (window->base_width ? window->base_width : window->min_width);
          int base_height = (window->base_height ? window->base_height : window->min_height);
  
          if (min_width) {
              floating_con->rect.width -= border_rect.width;
              floating_con->rect.width = max(floating_con->rect.width, min_width);
              floating_con->rect.width += border_rect.width;
          }
  
          if (min_height) {
              floating_con->rect.height -= border_rect.height;
              floating_con->rect.height = max(floating_con->rect.height, min_height);
              floating_con->rect.height += border_rect.height;
          }
  
          if (window->max_width) {
              floating_con->rect.width -= border_rect.width;
              floating_con->rect.width = min(floating_con->rect.width, window->max_width);
              floating_con->rect.width += border_rect.width;
          }
  
          if (window->max_height) {
              floating_con->rect.height -= border_rect.height;
              floating_con->rect.height = min(floating_con->rect.height, window->max_height);
              floating_con->rect.height += border_rect.height;
          }
  
          /* Obey the aspect ratio, if any, unless we are in fullscreen mode.
           *
           * The spec isn’t explicit on whether the aspect ratio hints should be
           * respected during fullscreen mode. Other WMs such as Openbox don’t do
           * that, and this post suggests that this is the correct way to do it:
           * https://mail.gnome.org/archives/wm-spec-list/2003-May/msg00007.html
           *
           * Ignoring aspect ratio during fullscreen was necessary to fix MPlayer
           * subtitle rendering, see https://bugs.i3wm.org/594 */
          const double min_ar = window->min_aspect_ratio;
          const double max_ar = window->max_aspect_ratio;
          if (floating_con->fullscreen_mode == CF_NONE && (min_ar > 0 || max_ar > 0)) {
              /* The ICCCM says to subtract the base size from the window size for
               * aspect ratio calculations. However, unlike determining the base
               * size itself we must not fall back to using the minimum size in
               * this case according to the ICCCM. */
              double width = floating_con->rect.width - window->base_width - border_rect.width;
              double height = floating_con->rect.height - window->base_height - border_rect.height;
              const double ar = (double)width / (double)height;
              double new_ar = -1;
              if (min_ar > 0 && ar < min_ar) {
                  new_ar = min_ar;
              } else if (max_ar > 0 && ar > max_ar) {
                  new_ar = max_ar;
              }
              if (new_ar > 0) {
                  if (prefer_height) {
                      width = round(height * new_ar);
                      height = round(width / new_ar);
                  } else {
                      height = round(width / new_ar);
                      width = round(height * new_ar);
                  }
                  floating_con->rect.width = width + window->base_width + border_rect.width;
                  floating_con->rect.height = height + window->base_height + border_rect.height;
              }
          }
  
          if (window->height_increment &&
              floating_con->rect.height >= base_height + border_rect.height) {
              floating_con->rect.height -= base_height + border_rect.height;
              floating_con->rect.height -= floating_con->rect.height % window->height_increment;
              floating_con->rect.height += base_height + border_rect.height;
          }
  
          if (window->width_increment &&
              floating_con->rect.width >= base_width + border_rect.width) {
              floating_con->rect.width -= base_width + border_rect.width;
              floating_con->rect.width -= floating_con->rect.width % window->width_increment;
              floating_con->rect.width += base_width + border_rect.width;
          }
      }
  
      /* Unless user requests otherwise (-1), raise the width/height to
       * reasonable minimum dimensions */
      if (config.floating_minimum_height != -1) {
          floating_con->rect.height -= border_rect.height;
          if (config.floating_minimum_height == 0) {
              floating_con->rect.height = max(floating_con->rect.height, floating_sane_min_height);
          } else {
              floating_con->rect.height = max(floating_con->rect.height, config.floating_minimum_height);
          }
          floating_con->rect.height += border_rect.height;
      }
  
      if (config.floating_minimum_width != -1) {
          floating_con->rect.width -= border_rect.width;
          if (config.floating_minimum_width == 0) {
              floating_con->rect.width = max(floating_con->rect.width, floating_sane_min_width);
          } else {
              floating_con->rect.width = max(floating_con->rect.width, config.floating_minimum_width);
          }
          floating_con->rect.width += border_rect.width;
      }
  
      /* Unless user requests otherwise (-1), ensure width/height do not exceed
       * configured maxima or, if unconfigured, limit to combined width of all
       * outputs */
      floating_sane_max_dimensions = total_outputs_dimensions();
      if (config.floating_maximum_height != -1) {
          floating_con->rect.height -= border_rect.height;
          if (config.floating_maximum_height == 0) {
              floating_con->rect.height = min(floating_con->rect.height, floating_sane_max_dimensions.height);
          } else {
              floating_con->rect.height = min(floating_con->rect.height, config.floating_maximum_height);
          }
          floating_con->rect.height += border_rect.height;
      }
  
      if (config.floating_maximum_width != -1) {
          floating_con->rect.width -= border_rect.width;
          if (config.floating_maximum_width == 0) {
              floating_con->rect.width = min(floating_con->rect.width, floating_sane_max_dimensions.width);
          } else {
              floating_con->rect.width = min(floating_con->rect.width, config.floating_maximum_width);
          }
          floating_con->rect.width += border_rect.width;
      }
  }
  
  void floating_enable(Con *con, bool automatic) {
      bool set_focus = (con == focused);
  
      if (con_is_docked(con)) {
          LOG("Container is a dock window, not enabling floating mode.\n");
          return;
      }
  
      if (con_is_floating(con)) {
          LOG("Container is already in floating mode, not doing anything.\n");
          return;
      }
  
      if (con->type == CT_WORKSPACE) {
          LOG("Container is a workspace, not enabling floating mode.\n");
          return;
      }
  
      Con *focus_head_placeholder = NULL;
      bool focus_before_parent = true;
      if (!set_focus) {
          /* Find recursively the ancestor container which is a child of our workspace.
           * We need to reuse its focus position later. */
          Con *ancestor = con;
          while (ancestor->parent->type != CT_WORKSPACE) {
              focus_before_parent &= TAILQ_FIRST(&(ancestor->parent->focus_head)) == ancestor;
              ancestor = ancestor->parent;
          }
          /* Consider the part of the focus stack of our current workspace:
           * [ ... S_{i-1} S_{i} S_{i+1} ... ]
           * Where S_{x} is a container tree and the container 'con' that is beeing switched to
           * floating belongs in S_{i}. The new floating container, 'nc', will have the
           * workspace as its parent so it needs to be placed in this stack. If C was focused
           * we just need to call con_focus(). Otherwise, nc must be placed before or after S_{i}.
           * We should avoid using the S_{i} container for our operations since it might get
           * killed if it has no other children. So, the two possible positions are after S_{i-1}
           * or before S_{i+1}.
           */
          if (focus_before_parent) {
              focus_head_placeholder = TAILQ_PREV(ancestor, focus_head, focused);
          } else {
              focus_head_placeholder = TAILQ_NEXT(ancestor, focused);
          }
      }
  
      /* 1: detach the container from its parent */
      /* TODO: refactor this with tree_close_internal() */
      con_detach(con);
      con_fix_percent(con->parent);
  
      /* 2: create a new container to render the decoration on, add
       * it as a floating window to the workspace */
      Con *nc = con_new(NULL, NULL);
      /* we need to set the parent afterwards instead of passing it as an
       * argument to con_new() because nc would be inserted into the tiling layer
       * otherwise. */
      Con *ws = con_get_workspace(con);
      nc->parent = ws;
      nc->type = CT_FLOATING_CON;
      nc->layout = L_SPLITH;
      /* We insert nc already, even though its rect is not yet calculated. This
       * is necessary because otherwise the workspace might be empty (and get
       * closed in tree_close_internal()) even though it’s not. */
      TAILQ_INSERT_HEAD(&(ws->floating_head), nc, floating_windows);
  
      struct focus_head *fh = &(ws->focus_head);
      if (focus_before_parent) {
          if (focus_head_placeholder) {
              TAILQ_INSERT_AFTER(fh, focus_head_placeholder, nc, focused);
          } else {
              TAILQ_INSERT_HEAD(fh, nc, focused);
          }
      } else {
          if (focus_head_placeholder) {
              TAILQ_INSERT_BEFORE(focus_head_placeholder, nc, focused);
          } else {
              /* Also used for the set_focus case */
              TAILQ_INSERT_TAIL(fh, nc, focused);
          }
      }
  
      /* check if the parent container is empty and close it if so */
      if ((con->parent->type == CT_CON || con->parent->type == CT_FLOATING_CON) &&
          con_num_children(con->parent) == 0) {
          DLOG("Old container empty after setting this child to floating, closing\n");
          Con *parent = con->parent;
          /* clear the pointer before calling tree_close_internal in which the memory is freed */
          con->parent = NULL;
          tree_close_internal(parent, DONT_KILL_WINDOW, false);
      }
  
      char *name;
      sasprintf(&name, "[i3 con] floatingcon around %p", con);
      x_set_name(nc, name);
      free(name);
  
      /* find the height for the decorations */
      int deco_height = render_deco_height();
  
      DLOG("Original rect: (%d, %d) with %d x %d\n", con->rect.x, con->rect.y, con->rect.width, con->rect.height);
      DLOG("Geometry = (%d, %d) with %d x %d\n", con->geometry.x, con->geometry.y, con->geometry.width, con->geometry.height);
      nc->rect = con->geometry;
      /* If the geometry was not set (split containers), we need to determine a
       * sensible one by combining the geometry of all children */
      if (rect_equals(nc->rect, (Rect){0, 0, 0, 0})) {
          DLOG("Geometry not set, combining children\n");
          Con *child;
          TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
              DLOG("child geometry: %d x %d\n", child->geometry.width, child->geometry.height);
              nc->rect.width += child->geometry.width;
              nc->rect.height = max(nc->rect.height, child->geometry.height);
          }
      }
  
      TAILQ_INSERT_TAIL(&(nc->nodes_head), con, nodes);
      TAILQ_INSERT_TAIL(&(nc->focus_head), con, focused);
  
      /* 3: attach the child to the new parent container. We need to do this
       * because con_border_style_rect() needs to access con->parent. */
      con->parent = nc;
      con->percent = 1.0;
      con->floating = FLOATING_USER_ON;
  
      /* 4: set the border style as specified with new_float */
      if (automatic)
          con->border_style = config.default_floating_border;
  
      /* Add pixels for the decoration. */
      Rect border_style_rect = con_border_style_rect(con);
  
      nc->rect.height -= border_style_rect.height;
      nc->rect.width -= border_style_rect.width;
  
      /* Add some more pixels for the title bar */
      if (con_border_style(con) == BS_NORMAL) {
          nc->rect.height += deco_height;
      }
  
      /* Honor the X11 border */
      nc->rect.height += con->border_width * 2;
      nc->rect.width += con->border_width * 2;
  
      floating_check_size(nc, false);
  
      /* Some clients (like GIMP’s color picker window) get mapped
       * to (0, 0), so we push them to a reasonable position
       * (centered over their leader) */
      if (nc->rect.x == 0 && nc->rect.y == 0) {
          Con *leader;
          if (con->window && con->window->leader != XCB_NONE &&
              con->window->id != con->window->leader &&
              (leader = con_by_window_id(con->window->leader)) != NULL) {
              DLOG("Centering above leader\n");
              floating_center(nc, leader->rect);
          } else {
              /* center the window on workspace as fallback */
              floating_center(nc, ws->rect);
          }
      }
  
      /* Sanity check: Are the coordinates on the appropriate output? If not, we
       * need to change them */
      Output *current_output = get_output_from_rect(nc->rect);
      Con *correct_output = con_get_output(ws);
      if (!current_output || current_output->con != correct_output) {
          DLOG("This floating window is on the wrong output, fixing coordinates (currently (%d, %d))\n",
               nc->rect.x, nc->rect.y);
  
          /* If moving from one output to another, keep the relative position
           * consistent (e.g. a centered dialog will remain centered). */
          if (current_output) {
              floating_fix_coordinates(nc, &current_output->con->rect, &correct_output->rect);
              /* Make sure that the result is in the correct output. */
              current_output = get_output_from_rect(nc->rect);
          }
          if (!current_output || current_output->con != correct_output) {
              floating_center(nc, ws->rect);
          }
      }
  
      DLOG("Floating rect: (%d, %d) with %d x %d\n", nc->rect.x, nc->rect.y, nc->rect.width, nc->rect.height);
  
      /* 5: Subtract the deco_height in order to make the floating window appear
       * at precisely the position it specified in its original geometry (which
       * is what applications might remember). */
      deco_height = (con->border_style == BS_NORMAL ? render_deco_height() : 0);
      nc->rect.y -= deco_height;
  
      DLOG("Corrected y = %d (deco_height = %d)\n", nc->rect.y, deco_height);
  
      /* render the cons to get initial window_rect correct */
      render_con(nc, true);
  
      if (set_focus)
          con_activate(con);
  
      floating_set_hint_atom(nc, true);
      ipc_send_window_event("floating", con);
  }
  
  void floating_disable(Con *con, bool automatic) {
      if (!con_is_floating(con)) {
          LOG("Container isn't floating, not doing anything.\n");
          return;
      }
  
      Con *ws = con_get_workspace(con);
      if (con_is_internal(ws)) {
          LOG("Can't disable floating for container in internal workspace.\n");
          return;
      }
      Con *tiling_focused = con_descend_tiling_focused(ws);
  
      if (tiling_focused->type == CT_WORKSPACE) {
          Con *parent = con->parent;
          con_detach(con);
          con->parent = NULL;
          tree_close_internal(parent, DONT_KILL_WINDOW, true);
          con_attach(con, tiling_focused, false);
          con->percent = 0.0;
          con_fix_percent(con->parent);
      } else {
          insert_con_into(con, tiling_focused, AFTER);
      }
  
      con->floating = FLOATING_USER_OFF;
      floating_set_hint_atom(con, false);
      ipc_send_window_event("floating", con);
  }
  
  /*
   * Toggles floating mode for the given container.
   *
   * If the automatic flag is set to true, this was an automatic update by a change of the
   * window class from the application which can be overwritten by the user.
   *
   */
  void toggle_floating_mode(Con *con, bool automatic) {
      /* forbid the command to toggle floating on a CT_FLOATING_CON */
      if (con->type == CT_FLOATING_CON) {
          ELOG("Cannot toggle floating mode on con = %p because it is of type CT_FLOATING_CON.\n", con);
          return;
      }
  
      /* see if the client is already floating */
      if (con_is_floating(con)) {
          LOG("already floating, re-setting to tiling\n");
  
          floating_disable(con, automatic);
          return;
      }
  
      floating_enable(con, automatic);
  }
  
  /*
   * Raises the given container in the list of floating containers
   *
   */
  void floating_raise_con(Con *con) {
      DLOG("Raising floating con %p / %s\n", con, con->name);
      TAILQ_REMOVE(&(con->parent->floating_head), con, floating_windows);
      TAILQ_INSERT_TAIL(&(con->parent->floating_head), con, floating_windows);
  }
  
  /*
   * Checks if con’s coordinates are within its workspace and re-assigns it to
   * the actual workspace if not.
   *
   */
  bool floating_maybe_reassign_ws(Con *con) {
      if (con_is_internal(con_get_workspace(con))) {
          DLOG("Con in an internal workspace\n");
          return false;
      }
  
      Output *output = get_output_from_rect(con->rect);
  
      if (!output) {
          ELOG("No output found at destination coordinates?\n");
          return false;
      }
  
      if (con_get_output(con) == output->con) {
          DLOG("still the same ws\n");
          return false;
      }
  
      DLOG("Need to re-assign!\n");
  
      Con *content = output_get_content(output->con);
      Con *ws = TAILQ_FIRST(&(content->focus_head));
      DLOG("Moving con %p / %s to workspace %p / %s\n", con, con->name, ws, ws->name);
      con_move_to_workspace(con, ws, false, true, false);
      workspace_show(ws);
      con_activate(con_descend_focused(con));
      return true;
  }
  
  /*
   * Centers a floating con above the specified rect.
   *
   */
  void floating_center(Con *con, Rect rect) {
      con->rect.x = rect.x + (rect.width / 2) - (con->rect.width / 2);
      con->rect.y = rect.y + (rect.height / 2) - (con->rect.height / 2);
  }
  
  /*
   * Moves the given floating con to the current pointer position.
   *
   */
  void floating_move_to_pointer(Con *con) {
      assert(con->type == CT_FLOATING_CON);
  
      xcb_query_pointer_reply_t *reply = xcb_query_pointer_reply(conn, xcb_query_pointer(conn, root), NULL);
      if (reply == NULL) {
          ELOG("could not query pointer position, not moving this container\n");
          return;
      }
  
      Output *output = get_output_containing(reply->root_x, reply->root_y);
      if (output == NULL) {
          ELOG("The pointer is not on any output, cannot move the container here.\n");
          return;
      }
  
      /* Determine where to put the window. */
      int32_t x = reply->root_x - con->rect.width / 2;
      int32_t y = reply->root_y - con->rect.height / 2;
      FREE(reply);
  
      /* Correct target coordinates to be in-bounds. */
      x = MAX(x, (int32_t)output->rect.x);
      y = MAX(y, (int32_t)output->rect.y);
      if (x + con->rect.width > output->rect.x + output->rect.width)
          x = output->rect.x + output->rect.width - con->rect.width;
      if (y + con->rect.height > output->rect.y + output->rect.height)
          y = output->rect.y + output->rect.height - con->rect.height;
  
      /* Update container's coordinates to position it correctly. */
      floating_reposition(con, (Rect){x, y, con->rect.width, con->rect.height});
  }
  
  DRAGGING_CB(drag_window_callback) {
      /* Reposition the client correctly while moving */
      con->rect.x = old_rect->x + (new_x - event->root_x);
      con->rect.y = old_rect->y + (new_y - event->root_y);
  
      render_con(con, true);
      x_push_node(con);
      xcb_flush(conn);
  
      /* Check if we cross workspace boundaries while moving */
      if (!floating_maybe_reassign_ws(con))
          return;
      /* Ensure not to warp the pointer while dragging */
      x_set_warp_to(NULL);
      tree_render();
  }
  
  /*
   * Called when the user clicked on the titlebar of a floating window.
   * Calls the drag_pointer function with the drag_window callback
   *
   */
  void floating_drag_window(Con *con, const xcb_button_press_event_t *event, bool use_threshold) {
      DLOG("floating_drag_window\n");
  
      /* Push changes before dragging, so that the window gets raised now and not
       * after the user releases the mouse button */
      tree_render();
  
      /* Store the initial rect in case of user revert/cancel */
      Rect initial_rect = con->rect;
  
      /* Drag the window */
      drag_result_t drag_result = drag_pointer(con, event, XCB_NONE, XCURSOR_CURSOR_MOVE, use_threshold, drag_window_callback, NULL);
  
      if (!con_exists(con)) {
          DLOG("The container has been closed in the meantime.\n");
          return;
      }
  
      /* If the user cancelled, undo the changes. */
      if (drag_result == DRAG_REVERT) {
          floating_reposition(con, initial_rect);
          return;
      }
  
      /* If this is a scratchpad window, don't auto center it from now on. */
      if (con->scratchpad_state == SCRATCHPAD_FRESH)
          con->scratchpad_state = SCRATCHPAD_CHANGED;
  
      tree_render();
  }
  
  /*
   * This is an ugly data structure which we need because there is no standard
   * way of having nested functions (only available as a gcc extension at the
   * moment, clang doesn’t support it) or blocks (only available as a clang
   * extension and only on Mac OS X systems at the moment).
   *
   */
  struct resize_window_callback_params {
      const border_t corner;
      const bool proportional;
  };
  
  DRAGGING_CB(resize_window_callback) {
      const struct resize_window_callback_params *params = extra;
      border_t corner = params->corner;
  
      int32_t dest_x = con->rect.x;
      int32_t dest_y = con->rect.y;
      uint32_t dest_width;
      uint32_t dest_height;
  
      double ratio = (double)old_rect->width / old_rect->height;
  
      /* First guess: We resize by exactly the amount the mouse moved,
       * taking into account in which corner the client was grabbed */
      if (corner & BORDER_LEFT)
          dest_width = old_rect->width - (new_x - event->root_x);
      else
          dest_width = old_rect->width + (new_x - event->root_x);
  
      if (corner & BORDER_TOP)
          dest_height = old_rect->height - (new_y - event->root_y);
      else
          dest_height = old_rect->height + (new_y - event->root_y);
  
      /* User wants to keep proportions, so we may have to adjust our values */
      if (params->proportional) {
          dest_width = max(dest_width, (int)(dest_height * ratio));
          dest_height = max(dest_height, (int)(dest_width / ratio));
      }
  
      con->rect = (Rect){dest_x, dest_y, dest_width, dest_height};
  
      /* Obey window size */
      floating_check_size(con, false);
  
      /* If not the lower right corner is grabbed, we must also reposition
       * the client by exactly the amount we resized it */
      if (corner & BORDER_LEFT)
          dest_x = old_rect->x + (old_rect->width - con->rect.width);
  
      if (corner & BORDER_TOP)
          dest_y = old_rect->y + (old_rect->height - con->rect.height);
  
      con->rect.x = dest_x;
      con->rect.y = dest_y;
  
      render_con(con, true);
      x_push_changes(croot);
  }
  
  /*
   * Called when the user clicked on a floating window while holding the
   * floating_modifier and the right mouse button.
   * Calls the drag_pointer function with the resize_window callback
   *
   */
  void floating_resize_window(Con *con, const bool proportional,
                              const xcb_button_press_event_t *event) {
      DLOG("floating_resize_window\n");
  
      /* corner saves the nearest corner to the original click. It contains
       * a bitmask of the nearest borders (BORDER_LEFT, BORDER_RIGHT, …) */
      border_t corner = 0;
  
      if (event->event_x <= (int16_t)(con->rect.width / 2))
          corner |= BORDER_LEFT;
      else
          corner |= BORDER_RIGHT;
  
      int cursor = 0;
      if (event->event_y <= (int16_t)(con->rect.height / 2)) {
          corner |= BORDER_TOP;
          cursor = (corner & BORDER_LEFT) ? XCURSOR_CURSOR_TOP_LEFT_CORNER : XCURSOR_CURSOR_TOP_RIGHT_CORNER;
      } else {
          corner |= BORDER_BOTTOM;
          cursor = (corner & BORDER_LEFT) ? XCURSOR_CURSOR_BOTTOM_LEFT_CORNER : XCURSOR_CURSOR_BOTTOM_RIGHT_CORNER;
      }
  
      struct resize_window_callback_params params = {corner, proportional};
  
      /* get the initial rect in case of revert/cancel */
      Rect initial_rect = con->rect;
  
      drag_result_t drag_result = drag_pointer(con, event, XCB_NONE, cursor, false, resize_window_callback, &params);
  
      if (!con_exists(con)) {
          DLOG("The container has been closed in the meantime.\n");
          return;
      }
  
      /* If the user cancels, undo the resize */
      if (drag_result == DRAG_REVERT)
          floating_reposition(con, initial_rect);
  
      /* If this is a scratchpad window, don't auto center it from now on. */
      if (con->scratchpad_state == SCRATCHPAD_FRESH)
          con->scratchpad_state = SCRATCHPAD_CHANGED;
  }
  
  /*
   * Repositions the CT_FLOATING_CON to have the coordinates specified by
   * newrect, but only if the coordinates are not out-of-bounds. Also reassigns
   * the floating con to a different workspace if this move was across different
   * outputs.
   *
   */
  bool floating_reposition(Con *con, Rect newrect) {
      /* Sanity check: Are the new coordinates on any output? If not, we
       * ignore that request. */
      if (!output_containing_rect(newrect)) {
          ELOG("No output found at destination coordinates. Not repositioning.\n");
          return false;
      }
  
      con->rect = newrect;
  
      bool reassigned = floating_maybe_reassign_ws(con);
  
      /* If this is a scratchpad window, don't auto center it from now on. */
      if (con->scratchpad_state == SCRATCHPAD_FRESH)
          con->scratchpad_state = SCRATCHPAD_CHANGED;
  
      /* Workspace change will already result in a tree_render. */
      if (!reassigned) {
          tree_render();
      }
      return true;
  }
  
  /*
   * Sets size of the CT_FLOATING_CON to specified dimensions. Might limit the
   * actual size with regard to size constraints taken from user settings.
   * Additionally, the dimensions may be upscaled until they're divisible by the
   * window's size hints.
   *
   */
  void floating_resize(Con *floating_con, uint32_t x, uint32_t y) {
      DLOG("floating resize to %dx%d px\n", x, y);
      Rect *rect = &floating_con->rect;
      Con *focused_con = con_descend_focused(floating_con);
      if (focused_con->window == NULL) {
          DLOG("No window is focused. Not resizing.\n");
          return;
      }
      int wi = focused_con->window->width_increment;
      int hi = focused_con->window->height_increment;
      bool prefer_height = (rect->width == x);
      rect->width = x;
      rect->height = y;
      if (wi)
          rect->width += (wi - 1 - rect->width) % wi;
      if (hi)
          rect->height += (hi - 1 - rect->height) % hi;
  
      floating_check_size(floating_con, prefer_height);
  
      /* If this is a scratchpad window, don't auto center it from now on. */
      if (floating_con->scratchpad_state == SCRATCHPAD_FRESH)
          floating_con->scratchpad_state = SCRATCHPAD_CHANGED;
  }
  
  /*
   * Fixes the coordinates of the floating window whenever the window gets
   * reassigned to a different output (or when the output’s rect changes).
   *
   */
  void floating_fix_coordinates(Con *con, Rect *old_rect, Rect *new_rect) {
      DLOG("Fixing coordinates of floating window %p (rect (%d, %d), %d x %d)\n",
           con, con->rect.x, con->rect.y, con->rect.width, con->rect.height);
      DLOG("old_rect = (%d, %d), %d x %d\n",
           old_rect->x, old_rect->y, old_rect->width, old_rect->height);
      DLOG("new_rect = (%d, %d), %d x %d\n",
           new_rect->x, new_rect->y, new_rect->width, new_rect->height);
      /* First we get the x/y coordinates relative to the x/y coordinates
       * of the output on which the window is on */
      int32_t rel_x = con->rect.x - old_rect->x + (int32_t)(con->rect.width / 2);
      int32_t rel_y = con->rect.y - old_rect->y + (int32_t)(con->rect.height / 2);
      /* Then we calculate a fraction, for example 0.63 for a window
       * which is at y = 1212 of a 1920 px high output */
      DLOG("rel_x = %d, rel_y = %d, fraction_x = %f, fraction_y = %f, output->w = %d, output->h = %d\n",
           rel_x, rel_y, (double)rel_x / old_rect->width, (double)rel_y / old_rect->height,
           old_rect->width, old_rect->height);
      /* Here we have to multiply at first. Or we will lose precision when not compiled with -msse2 */
      con->rect.x = (int32_t)new_rect->x + (double)(rel_x * (int32_t)new_rect->width) / (int32_t)old_rect->width - (int32_t)(con->rect.width / 2);
      con->rect.y = (int32_t)new_rect->y + (double)(rel_y * (int32_t)new_rect->height) / (int32_t)old_rect->height - (int32_t)(con->rect.height / 2);
      DLOG("Resulting coordinates: x = %d, y = %d\n", con->rect.x, con->rect.y);
  }
  