godot/scene/gui/center_container.cpp
Hein-Pieter van Braam cacced7e50 Convert Object::cast_to() to the static version
Currently we rely on some undefined behavior when Object->cast_to() gets
called with a Null pointer. This used to work fine with GCC < 6 but
newer versions of GCC remove all codepaths in which the this pointer is
Null. However, the non-static cast_to() was supposed to be null safe.

This patch makes cast_to() Null safe and removes the now redundant Null
checks where they existed.

It is explained in this article: https://www.viva64.com/en/b/0226/
2017-08-24 23:08:24 +02:00

97 lines
3.7 KiB
C++

/*************************************************************************/
/* center_container.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* http://www.godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2017 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 "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) {
use_top_left = p_enable;
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;
}