godot/scene/gui/panel_container.cpp

/*************************************************************************/
/*  panel_container.cpp                                                  */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 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("panel")) {
		style = get_theme_stylebox("panel");
	} else {
		style = get_theme_stylebox("panel", "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;
}

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

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

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

	if (p_what == NOTIFICATION_SORT_CHILDREN) {
		Ref<StyleBox> style;

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

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