text: /*************************************************************************/
  /*  aspect_ratio_container.cpp                                           */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
  /*                                                                       */
  /* 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 "aspect_ratio_container.h"
  
  Size2 AspectRatioContainer::get_minimum_size() const {
  	Size2 ms;
  	for (int i = 0; i < get_child_count(); i++) {
  		Control *c = Object::cast_to<Control>(get_child(i));
  		if (!c) {
  			continue;
  		}
  		if (c->is_set_as_toplevel()) {
  			continue;
  		}
  		if (!c->is_visible()) {
  			continue;
  		}
  		Size2 minsize = c->get_combined_minimum_size();
  		ms.width = MAX(ms.width, minsize.width);
  		ms.height = MAX(ms.height, minsize.height);
  	}
  	return ms;
  }
  
  void AspectRatioContainer::set_ratio(float p_ratio) {
  	ratio = p_ratio;
  	queue_sort();
  }
  
  void AspectRatioContainer::set_stretch_mode(StretchMode p_mode) {
  	stretch_mode = p_mode;
  	queue_sort();
  }
  
  void AspectRatioContainer::set_alignment_horizontal(AlignMode p_alignment_horizontal) {
  	alignment_horizontal = p_alignment_horizontal;
  	queue_sort();
  }
  
  void AspectRatioContainer::set_alignment_vertical(AlignMode p_alignment_vertical) {
  	alignment_vertical = p_alignment_vertical;
  	queue_sort();
  }
  
  void AspectRatioContainer::_notification(int p_what) {
  	switch (p_what) {
  		case NOTIFICATION_SORT_CHILDREN: {
  			Size2 size = get_size();
  			for (int i = 0; i < get_child_count(); i++) {
  				Control *c = Object::cast_to<Control>(get_child(i));
  				if (!c) {
  					continue;
  				}
  				if (c->is_set_as_toplevel()) {
  					continue;
  				}
  				Size2 child_minsize = c->get_combined_minimum_size();
  				Size2 child_size = Size2(ratio, 1.0);
  				float scale_factor = 1.0;
  
  				switch (stretch_mode) {
  					case STRETCH_WIDTH_CONTROLS_HEIGHT: {
  						scale_factor = size.x / child_size.x;
  					} break;
  					case STRETCH_HEIGHT_CONTROLS_WIDTH: {
  						scale_factor = size.y / child_size.y;
  					} break;
  					case STRETCH_FIT: {
  						scale_factor = MIN(size.x / child_size.x, size.y / child_size.y);
  					} break;
  					case STRETCH_COVER: {
  						scale_factor = MAX(size.x / child_size.x, size.y / child_size.y);
  					} break;
  				}
  				child_size *= scale_factor;
  				child_size.x = MAX(child_size.x, child_minsize.x);
  				child_size.y = MAX(child_size.y, child_minsize.y);
  
  				float align_x = 0.5;
  				switch (alignment_horizontal) {
  					case ALIGN_BEGIN: {
  						align_x = 0.0;
  					} break;
  					case ALIGN_CENTER: {
  						align_x = 0.5;
  					} break;
  					case ALIGN_END: {
  						align_x = 1.0;
  					} break;
  				}
  				float align_y = 0.5;
  				switch (alignment_vertical) {
  					case ALIGN_BEGIN: {
  						align_y = 0.0;
  					} break;
  					case ALIGN_CENTER: {
  						align_y = 0.5;
  					} break;
  					case ALIGN_END: {
  						align_y = 1.0;
  					} break;
  				}
  				Vector2 offset = (size - child_size) * Vector2(align_x, align_y);
  
  				fit_child_in_rect(c, Rect2(offset, child_size));
  			}
  		} break;
  	}
  }
  
  void AspectRatioContainer::_bind_methods() {
  	ClassDB::bind_method(D_METHOD("set_ratio", "ratio"), &AspectRatioContainer::set_ratio);
  	ClassDB::bind_method(D_METHOD("get_ratio"), &AspectRatioContainer::get_ratio);
  
  	ClassDB::bind_method(D_METHOD("set_stretch_mode", "stretch_mode"), &AspectRatioContainer::set_stretch_mode);
  	ClassDB::bind_method(D_METHOD("get_stretch_mode"), &AspectRatioContainer::get_stretch_mode);
  
  	ClassDB::bind_method(D_METHOD("set_alignment_horizontal", "alignment_horizontal"), &AspectRatioContainer::set_alignment_horizontal);
  	ClassDB::bind_method(D_METHOD("get_alignment_horizontal"), &AspectRatioContainer::get_alignment_horizontal);
  
  	ClassDB::bind_method(D_METHOD("set_alignment_vertical", "alignment_vertical"), &AspectRatioContainer::set_alignment_vertical);
  	ClassDB::bind_method(D_METHOD("get_alignment_vertical"), &AspectRatioContainer::get_alignment_vertical);
  
  	ADD_PROPERTY(PropertyInfo(Variant::REAL, "ratio", PROPERTY_HINT_RANGE, "0.001,10.0,0.0001,or_greater"), "set_ratio", "get_ratio");
  	ADD_PROPERTY(PropertyInfo(Variant::INT, "stretch_mode", PROPERTY_HINT_ENUM, "Width controls height,Height controls width,Fit,Cover"), "set_stretch_mode", "get_stretch_mode");
  
  	ADD_GROUP("Alignment", "alignment_");
  	ADD_PROPERTY(PropertyInfo(Variant::INT, "alignment_horizontal", PROPERTY_HINT_ENUM, "Begin,Center,End"), "set_alignment_horizontal", "get_alignment_horizontal");
  	ADD_PROPERTY(PropertyInfo(Variant::INT, "alignment_vertical", PROPERTY_HINT_ENUM, "Begin,Center,End"), "set_alignment_vertical", "get_alignment_vertical");
  
  	BIND_ENUM_CONSTANT(STRETCH_WIDTH_CONTROLS_HEIGHT);
  	BIND_ENUM_CONSTANT(STRETCH_HEIGHT_CONTROLS_WIDTH);
  	BIND_ENUM_CONSTANT(STRETCH_FIT);
  	BIND_ENUM_CONSTANT(STRETCH_COVER);
  
  	BIND_ENUM_CONSTANT(ALIGN_BEGIN);
  	BIND_ENUM_CONSTANT(ALIGN_CENTER);
  	BIND_ENUM_CONSTANT(ALIGN_END);
  }
  