godot/scene/gui/margin_container.cpp

/*************************************************************************/
/*  margin_container.cpp                                                 */
/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
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#include "margin_container.h"

Size2 MarginContainer::get_minimum_size() const {

	int margin_left = get_theme_constant("margin_left");
	int margin_top = get_theme_constant("margin_top");
	int margin_right = get_theme_constant("margin_right");
	int margin_bottom = get_theme_constant("margin_bottom");

	Size2 max;

	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 s = c->get_combined_minimum_size();
		if (s.width > max.width)
			max.width = s.width;
		if (s.height > max.height)
			max.height = s.height;
	}

	max.width += (margin_left + margin_right);
	max.height += (margin_top + margin_bottom);

	return max;
}

void MarginContainer::_notification(int p_what) {

	switch (p_what) {
		case NOTIFICATION_SORT_CHILDREN: {

			int margin_left = get_theme_constant("margin_left");
			int margin_top = get_theme_constant("margin_top");
			int margin_right = get_theme_constant("margin_right");
			int margin_bottom = get_theme_constant("margin_bottom");

			Size2 s = 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;

				int w = s.width - margin_left - margin_right;
				int h = s.height - margin_top - margin_bottom;
				fit_child_in_rect(c, Rect2(margin_left, margin_top, w, h));
			}
		} break;
		case NOTIFICATION_THEME_CHANGED: {

			minimum_size_changed();
		} break;
	}
}

MarginContainer::MarginContainer() {
}