blob: 65fcf684e5c7e0accf5ac0c81faf99efb4f8b406 [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <vector>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "ui/aura/aura_export.h"
#include "ui/aura/window_observer.h"
namespace aura {
// This class keeps track of a set of windows. A Window is removed either
// explicitly by Remove() or Pop(), or implicitly when the window is destroyed.
class AURA_EXPORT WindowTracker : public WindowObserver {
using WindowList = std::vector<Window*>;
explicit WindowTracker(const WindowList& windows);
~WindowTracker() override;
bool has_windows() const { return !windows_.empty(); }
// Returns the set of windows being observed.
const std::vector<Window*>& windows() const { return windows_; }
// Adds |window| to the set of Windows being tracked.
void Add(Window* window);
// Removes |window| from the set of windows being tracked.
void Remove(Window* window);
// Returns true if |window| was previously added and has not been removed or
// deleted.
bool Contains(Window* window);
// Removes and returns the window object from the tracking windows.
aura::Window* Pop();
// WindowObserver overrides:
void OnWindowDestroying(Window* window) override;
WindowList windows_;
} // namespace aura