text: /*************************************************************************/
  /*  split_container.cpp                                                  */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                    http://www.godotengine.org                         */
  /*************************************************************************/
  /* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  #include "split_container.h"
  
  #include "margin_container.h"
  #include "label.h"
  
  
  
  struct _MinSizeCache {
  
  	int min_size;
  	bool will_stretch;
  	int final_size;
  };
  
  
  Control *SplitContainer::_getch(int p_idx) const {
  
  	int idx=0;
  
  	for(int i=0;i<get_child_count();i++) {
  		Control *c=get_child(i)->cast_to<Control>();
  		if (!c || !c->is_visible())
  			continue;
  		if (c->is_set_as_toplevel())
  			continue;
  
  		if (idx==p_idx)
  			return c;
  
  		idx++;
  	}
  
  	return NULL;
  
  }
  
  
  void SplitContainer::_resort() {
  
  	/** First pass, determine minimum size AND amount of stretchable elements */
  
  	int axis = vertical?1:0;
  
  	bool has_first=_getch(0);
  	bool has_second=_getch(1);
  
  	if (!has_first && !has_second) {
  		return;
  	} else if (! (has_first && has_second)) {
  		if (has_first)
  			fit_child_in_rect(_getch(0),Rect2(Point2(),get_size()));
  		else
  			fit_child_in_rect(_getch(1),Rect2(Point2(),get_size()));
  
  		return;
  	}
  
  
  
  	Control *first=_getch(0);
  	Control *second=_getch(1);
  
  
  	bool ratiomode=false;
  	bool expand_first_mode=false;
  
  
  
  
  	if (vertical) {
  
  		ratiomode=first->get_v_size_flags()&SIZE_EXPAND && second->get_v_size_flags()&SIZE_EXPAND;
  		expand_first_mode=first->get_v_size_flags()&SIZE_EXPAND && !(second->get_v_size_flags()&SIZE_EXPAND);
  	} else {
  
  		ratiomode=first->get_h_size_flags()&SIZE_EXPAND && second->get_h_size_flags()&SIZE_EXPAND;
  		expand_first_mode=first->get_h_size_flags()&SIZE_EXPAND && !(second->get_h_size_flags()&SIZE_EXPAND);
  	}
  
  
  	int sep=get_constant("separation");
  	Ref<Texture> g = get_icon("grabber");
  
  	if (dragger_visibility==DRAGGER_HIDDEN_COLLAPSED) {
  		sep=0;
  	} else {
  		sep=MAX(sep,vertical?g->get_height():g->get_width());
  	}
  
  	int total = vertical?get_size().height:get_size().width;
  
  	total-=sep;
  
  	int minimum=0;
  
  	Size2 ms_first = first->get_combined_minimum_size();
  	Size2 ms_second = second->get_combined_minimum_size();
  
  	if (vertical) {
  
  		minimum=ms_first.height+ms_second.height;
  	} else {
  
  		minimum=ms_first.width+ms_second.width;
  	}
  
  	int available=total-minimum;
  	if (available<0)
  		available=0;
  
  
  	middle_sep=0;
  
  	if (collapsed) {
  
  
  		if (ratiomode) {
  
  			middle_sep=ms_first[axis]+available/2;
  
  
  		} else if (expand_first_mode) {
  
  			middle_sep=get_size()[axis]-ms_second[axis]-sep;
  
  		} else {
  
  			middle_sep=ms_first[axis];
  		}
  
  
  	} else if (ratiomode) {
  
  		if (expand_ofs<-(available/2))
  			expand_ofs=-(available/2);
  		else if (expand_ofs>(available/2))
  			expand_ofs=(available/2);
  
  		middle_sep=ms_first[axis]+available/2+expand_ofs;
  
  
  	} else if (expand_first_mode) {
  
  		if (expand_ofs>0)
  			expand_ofs=0;
  
  		if (expand_ofs < -available)
  			expand_ofs=-available;
  
  		middle_sep=get_size()[axis]-ms_second[axis]-sep+expand_ofs;
  
  	} else {
  
  		if (expand_ofs<0)
  			expand_ofs=0;
  
  		if (expand_ofs > available)
  			expand_ofs=available;
  
  		middle_sep=ms_first[axis]+expand_ofs;
  
  	}
  
  
  
  	if (vertical) {
  
  		fit_child_in_rect(first,Rect2(Point2(0,0),Size2(get_size().width,middle_sep)));
  		int sofs=middle_sep+sep;
  		fit_child_in_rect(second,Rect2(Point2(0,sofs),Size2(get_size().width,get_size().height-sofs)));
  
  	} else {
  
  
  		fit_child_in_rect(first,Rect2(Point2(0,0),Size2(middle_sep,get_size().height)));
  		int sofs=middle_sep+sep;
  		fit_child_in_rect(second,Rect2(Point2(sofs,0),Size2(get_size().width-sofs,get_size().height)));
  	}
  
  	update();
  	_change_notify("split/offset");
  
  }
  
  
  
  
  Size2 SplitContainer::get_minimum_size() const {
  
  
  	/* Calculate MINIMUM SIZE */
  
  	Size2i minimum;
  	int sep=get_constant("separation");
  	Ref<Texture> g = get_icon("grabber");
  	sep=(dragger_visibility!=DRAGGER_HIDDEN_COLLAPSED)?MAX(sep,vertical?g->get_height():g->get_width()):0;
  
  	for(int i=0;i<2;i++) {
  
  		if (!_getch(i))
  			break;
  
  		if (i==1) {
  
  			if (vertical)
  				minimum.height+=sep;
  			else
  				minimum.width+=sep;
  		}
  
  		Size2 ms = _getch(i)->get_combined_minimum_size();
  
  		if (vertical) {
  
  			minimum.height+=ms.height;
  			minimum.width=MAX(minimum.width,ms.width);
  		} else {
  
  			minimum.width+=ms.width;
  			minimum.height=MAX(minimum.height,ms.height);
  		}
  
  	}
  
  	return minimum;
  
  
  }
  
  void SplitContainer::_notification(int p_what) {
  
  	switch(p_what) {
  
  		case NOTIFICATION_SORT_CHILDREN: {
  
  			_resort();
  		} break;
  		case NOTIFICATION_MOUSE_ENTER: {
  			mouse_inside=true;
  			update();
  		} break;
  		case NOTIFICATION_MOUSE_EXIT: {
  			mouse_inside=false;
  			update();
  		} break;
  		case NOTIFICATION_DRAW: {
  
  			if (!_getch(0) || !_getch(1))
  				return;
  
  			if (collapsed || (!mouse_inside && get_constant("autohide")))
  				return;
  			int sep=dragger_visibility!=DRAGGER_HIDDEN_COLLAPSED?get_constant("separation"):0;
  			Ref<Texture> tex = get_icon("grabber");
  			Size2 size=get_size();
  			if (vertical) {
  
  				//draw_style_box( get_stylebox("bg"), Rect2(0,middle_sep,get_size().width,sep));
  				if (dragger_visibility==DRAGGER_VISIBLE)
  					draw_texture(tex,Point2i((size.x-tex->get_width())/2,middle_sep+(sep-tex->get_height())/2));
  
  			} else {
  
  				//draw_style_box( get_stylebox("bg"), Rect2(middle_sep,0,sep,get_size().height));
  				if (dragger_visibility==DRAGGER_VISIBLE)
  					draw_texture(tex,Point2i(middle_sep+(sep-tex->get_width())/2,(size.y-tex->get_height())/2));
  
  			}
  
  		} break;
  	}
  }
  
  void SplitContainer::_input_event(const InputEvent& p_event) {
  
  	if (collapsed || !_getch(0) || !_getch(1) || dragger_visibility!=DRAGGER_VISIBLE)
  		return;
  
  	if (p_event.type==InputEvent::MOUSE_BUTTON) {
  
  		const InputEventMouseButton &mb=p_event.mouse_button;
  
  		if (mb.button_index==BUTTON_LEFT) {
  
  			if (mb.pressed) {
  				int sep=get_constant("separation");
  
  				if (vertical) {
  
  
  					if (mb.y > middle_sep && mb.y < middle_sep+sep) {
  						dragging=true;
  						drag_from=mb.y;
  						drag_ofs=expand_ofs;
  					}
  				} else {
  
  					if (mb.x > middle_sep && mb.x < middle_sep+sep) {
  						dragging=true;
  						drag_from=mb.x;
  						drag_ofs=expand_ofs;
  					}
  				}
  			} else {
  
  				dragging=false;
  			}
  
  		}
  	}
  
  	if (p_event.type==InputEvent::MOUSE_MOTION) {
  
  		const InputEventMouseMotion &mm=p_event.mouse_motion;
  
  		if (dragging) {
  
  			expand_ofs=drag_ofs+((vertical?mm.y:mm.x)-drag_from);
  			queue_sort();
  			emit_signal("dragged",get_split_offset());
  		}
  	}
  
  }
  
  Control::CursorShape SplitContainer::get_cursor_shape(const Point2& p_pos) {
  
  	if (collapsed)
  		return Control::get_cursor_shape(p_pos);
  
  	if (dragging)
  		return (vertical?CURSOR_VSIZE:CURSOR_HSIZE);
  
  	int sep=get_constant("separation");
  
  	if (vertical) {
  
  
  		if (p_pos.y > middle_sep && p_pos.y < middle_sep+sep) {
  			return CURSOR_VSIZE;
  		}
  	} else {
  
  		if (p_pos.x > middle_sep && p_pos.x < middle_sep+sep) {
  			return CURSOR_HSIZE;
  		}
  	}
  
  	return Control::get_cursor_shape(p_pos);
  
  }
  
  void SplitContainer::set_split_offset(int p_offset) {
  
  	if (expand_ofs==p_offset)
  		return;
  	expand_ofs=p_offset;
  	queue_sort();
  }
  
  int SplitContainer::get_split_offset() const {
  
  	return expand_ofs;
  }
  
  void SplitContainer::set_collapsed(bool p_collapsed) {
  
  	if (collapsed==p_collapsed)
  		return;
  	collapsed=p_collapsed;
  	queue_sort();
  
  }
  
  void SplitContainer::set_dragger_visibility(DraggerVisibility p_visibility) {
  
  	dragger_visibility=p_visibility;
  	queue_sort();
  	update();
  }
  
  SplitContainer::DraggerVisibility SplitContainer::get_dragger_visibility() const {
  
  	return dragger_visibility;
  }
  
  
  bool SplitContainer::is_collapsed() const {
  
  
  	return collapsed;
  }
  
  
  void SplitContainer::_bind_methods() {
  
  	ObjectTypeDB::bind_method(_MD("_input_event"),&SplitContainer::_input_event);
  	ObjectTypeDB::bind_method(_MD("set_split_offset","offset"),&SplitContainer::set_split_offset);
  	ObjectTypeDB::bind_method(_MD("get_split_offset"),&SplitContainer::get_split_offset);
  
  	ObjectTypeDB::bind_method(_MD("set_collapsed","collapsed"),&SplitContainer::set_collapsed);
  	ObjectTypeDB::bind_method(_MD("is_collapsed"),&SplitContainer::is_collapsed);
  
  	ObjectTypeDB::bind_method(_MD("set_dragger_visibility","mode"),&SplitContainer::set_dragger_visibility);
  	ObjectTypeDB::bind_method(_MD("get_dragger_visibility"),&SplitContainer::get_dragger_visibility);
  
  	ADD_SIGNAL( MethodInfo("dragged",PropertyInfo(Variant::INT,"offset")));
  
  	ADD_PROPERTY( PropertyInfo(Variant::INT,"split/offset"),_SCS("set_split_offset"),_SCS("get_split_offset"));
  	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"split/collapsed"),_SCS("set_collapsed"),_SCS("is_collapsed"));
  	ADD_PROPERTY( PropertyInfo(Variant::INT,"split/dragger_visibility",PROPERTY_HINT_ENUM,"Visible,Hidden,Hidden & Collapsed"),_SCS("set_dragger_visibility"),_SCS("get_dragger_visibility"));
  
  	BIND_CONSTANT( DRAGGER_VISIBLE );
  	BIND_CONSTANT( DRAGGER_HIDDEN );
  	BIND_CONSTANT( DRAGGER_HIDDEN_COLLAPSED );
  
  }
  
  SplitContainer::SplitContainer(bool p_vertical) {
  
  
  	mouse_inside=false;
  	expand_ofs=0;
  	middle_sep=0;
  	vertical=p_vertical;
  	dragging=false;
  	collapsed=false;
  	dragger_visibility=DRAGGER_VISIBLE;
  
  }
  
  
  