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/* Copyright (C) 2024 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#ifndef GUIOBJECTEVENTBROADCASTER
#define GUIOBJECTEVENTBROADCASTER
#include "gui/ObjectBases/IGUIObject.h"
#include "gui/ObjectBases/IGUIPanel.h"
namespace
{
struct VisibleObject
{
IGUIObject* object;
// Index of the object in a depth-first search inside GUI tree.
u32 index;
// Cached value of GetBufferedZ to avoid recursive calls in a deep hierarchy.
float bufferedZ;
};
template<class Container>
void CollectVisibleObjectsRecursively(const std::vector<IGUIObject*>& objects, Container* visibleObjects)
{
for (IGUIObject* const& object : objects)
if (!object->IsHidden())
{
visibleObjects->emplace_back(VisibleObject{ object, static_cast<u32>(visibleObjects->size()), 0.0f });
CollectVisibleObjectsRecursively(object->GetVisibleChildren(), visibleObjects);
}
}
}
class CGUIObjectEventBroadcaster
{
public:
template<typename... Args>
static void RecurseVisibleObject(IGUIObject* object, void(IGUIObject::* callbackFunction)(Args... args), Args&&... args)
{
using Arena = Allocators::DynamicArena<128 * KiB>;
using ObjectListAllocator = ProxyAllocator<VisibleObject, Arena>;
Arena arena;
std::vector<VisibleObject, ObjectListAllocator> visibleObjects((ObjectListAllocator(arena)));
CollectVisibleObjectsRecursively(object->GetVisibleChildren(), &visibleObjects);
for (VisibleObject& visibleObject : visibleObjects)
visibleObject.bufferedZ = visibleObject.object->GetBufferedZ();
std::sort(visibleObjects.begin(), visibleObjects.end(), [](const VisibleObject& visibleObject1, const VisibleObject& visibleObject2) -> bool {
if (visibleObject1.bufferedZ != visibleObject2.bufferedZ)
return visibleObject1.bufferedZ < visibleObject2.bufferedZ;
return visibleObject1.index < visibleObject2.index;
});
for (const VisibleObject& visibleObject : visibleObjects)
(visibleObject.object->*callbackFunction)(std::forward<Args>(args)...);
}
};
#endif // !GUIOBJECTEVENTBROADCASTER
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