godot/scene/gui/panel_container.cpp

/*************************************************************************/
/*  panel_container.cpp                                                  */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "panel_container.h"

Size2 PanelContainer::get_minimum_size() const {
	Ref<StyleBox> style;

	if (has_theme_stylebox(SNAME("panel"))) {
		style = get_theme_stylebox(SNAME("panel"));
	} else {
		style = get_theme_stylebox(SNAME("panel"), SNAME("PanelContainer"));
	}

	Size2 ms;
	for (int i = 0; i < get_child_count(); i++) {
		Control *c = Object::cast_to<Control>(get_child(i));
		if (!c || !c->is_visible()) {
			continue;
		}
		if (c->is_set_as_top_level()) {
			continue;
		}

		Size2 minsize = c->get_combined_minimum_size();
		ms.width = MAX(ms.width, minsize.width);
		ms.height = MAX(ms.height, minsize.height);
	}

	if (style.is_valid()) {
		ms += style->get_minimum_size();
	}
	return ms;
}

Vector<int> PanelContainer::get_allowed_size_flags_horizontal() const {
	Vector<int> flags;
	flags.append(SIZE_FILL);
	flags.append(SIZE_SHRINK_BEGIN);
	flags.append(SIZE_SHRINK_CENTER);
	flags.append(SIZE_SHRINK_END);
	return flags;
}

Vector<int> PanelContainer::get_allowed_size_flags_vertical() const {
	Vector<int> flags;
	flags.append(SIZE_FILL);
	flags.append(SIZE_SHRINK_BEGIN);
	flags.append(SIZE_SHRINK_CENTER);
	flags.append(SIZE_SHRINK_END);
	return flags;
}

void PanelContainer::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_DRAW: {
			RID ci = get_canvas_item();
			Ref<StyleBox> style;

			if (has_theme_stylebox(SNAME("panel"))) {
				style = get_theme_stylebox(SNAME("panel"));
			} else {
				style = get_theme_stylebox(SNAME("panel"), SNAME("PanelContainer"));
			}

			style->draw(ci, Rect2(Point2(), get_size()));
		} break;

		case NOTIFICATION_SORT_CHILDREN: {
			Ref<StyleBox> style;

			if (has_theme_stylebox(SNAME("panel"))) {
				style = get_theme_stylebox(SNAME("panel"));
			} else {
				style = get_theme_stylebox(SNAME("panel"), SNAME("PanelContainer"));
			}

			Size2 size = get_size();
			Point2 ofs;
			if (style.is_valid()) {
				size -= style->get_minimum_size();
				ofs += style->get_offset();
			}

			for (int i = 0; i < get_child_count(); i++) {
				Control *c = Object::cast_to<Control>(get_child(i));
				if (!c || !c->is_visible_in_tree()) {
					continue;
				}
				if (c->is_set_as_top_level()) {
					continue;
				}

				fit_child_in_rect(c, Rect2(ofs, size));
			}
		} break;
	}
}

PanelContainer::PanelContainer() {
	// Has visible stylebox, so stop by default.
	set_mouse_filter(MOUSE_FILTER_STOP);
}