| // Copyright 2018 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. |
| |
| #ifndef UI_AURA_EXTRA_WINDOW_POSITION_IN_ROOT_MONITOR_H_ |
| #define UI_AURA_EXTRA_WINDOW_POSITION_IN_ROOT_MONITOR_H_ |
| |
| #include <vector> |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "ui/aura/window_observer.h" |
| |
| namespace aura_extra { |
| |
| // WindowPositionInRootMonitor notifies a callback any time the position of a |
| // window, relative to the root, changes. Changes are only sent when attached |
| // to a valid root. |
| class WindowPositionInRootMonitor : public aura::WindowObserver { |
| public: |
| WindowPositionInRootMonitor(aura::Window* window, |
| base::RepeatingClosure callback); |
| ~WindowPositionInRootMonitor() override; |
| |
| private: |
| // Adds |window| and all its ancestors to |ancestors_|. |
| void AddAncestors(aura::Window* window); |
| |
| // aura::WindowObserver: |
| void OnWindowDestroyed(aura::Window* window) override; |
| void OnWindowParentChanged(aura::Window* window, |
| aura::Window* parent) override; |
| void OnWindowBoundsChanged(aura::Window* window, |
| const gfx::Rect& old_bounds, |
| const gfx::Rect& new_bounds, |
| ui::PropertyChangeReason reason) override; |
| |
| base::RepeatingClosure callback_; |
| |
| // The windows being watched. This contains the window supplied to the |
| // constructor and all it's ancestors. This is empty if the window is deleted. |
| std::vector<aura::Window*> ancestors_; |
| |
| DISALLOW_COPY_AND_ASSIGN(WindowPositionInRootMonitor); |
| }; |
| |
| } // namespace aura_extra |
| |
| #endif // UI_AURA_EXTRA_WINDOW_POSITION_IN_ROOT_MONITOR_H_ |