godot/scene/gui/center_container.cpp

/**************************************************************************/
/*  center_container.cpp                                                  */
/**************************************************************************/
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/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#include "center_container.h"

Size2 CenterContainer::get_minimum_size() const {
	if (use_top_left) {
		return Size2();
	}
	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 CenterContainer::set_use_top_left(bool p_enable) {
	if (use_top_left == p_enable) {
		return;
	}

	use_top_left = p_enable;

	minimum_size_changed();
	queue_sort();
}

bool CenterContainer::is_using_top_left() const {
	return use_top_left;
}

void CenterContainer::_notification(int p_what) {
	if (p_what == 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 minsize = c->get_combined_minimum_size();
			Point2 ofs = use_top_left ? (-minsize * 0.5).floor() : ((size - minsize) / 2.0).floor();
			fit_child_in_rect(c, Rect2(ofs, minsize));
		}
	}
}

void CenterContainer::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_use_top_left", "enable"), &CenterContainer::set_use_top_left);
	ClassDB::bind_method(D_METHOD("is_using_top_left"), &CenterContainer::is_using_top_left);

	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "use_top_left"), "set_use_top_left", "is_using_top_left");
}

CenterContainer::CenterContainer() {
	use_top_left = false;
}