| // 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. |
| |
| #ifndef ASH_WM_RESIZE_SHADOW_H_ |
| #define ASH_WM_RESIZE_SHADOW_H_ |
| |
| #include <memory> |
| |
| #include "base/macros.h" |
| #include "ui/aura/window_observer.h" |
| |
| namespace aura { |
| class Window; |
| } |
| namespace ui { |
| class Layer; |
| } |
| |
| namespace ash { |
| |
| // A class to render the resize edge effect when the user moves their mouse |
| // over a sizing edge. This is just a visual effect; the actual resize is |
| // handled by the EventFilter. |
| class ResizeShadow : public aura::WindowObserver { |
| public: |
| explicit ResizeShadow(aura::Window* window); |
| ~ResizeShadow() override; |
| |
| // aura::WindowObserver: |
| void OnWindowBoundsChanged(aura::Window* window, |
| const gfx::Rect& old_bounds, |
| const gfx::Rect& new_bounds, |
| ui::PropertyChangeReason reason) override; |
| void OnWindowHierarchyChanged(const HierarchyChangeParams& params) override; |
| void OnWindowStackingChanged(aura::Window* window) override; |
| |
| // Shows resize effects for one or more edges based on a |hit_test| code, such |
| // as HTRIGHT or HTBOTTOMRIGHT. |
| void ShowForHitTest(int hit_test); |
| |
| // Hides all resize effects. |
| void Hide(); |
| |
| int GetLastHitTestForTest() const { return last_hit_test_; } |
| const ui::Layer* GetLayerForTest() const { return layer_.get(); } |
| |
| private: |
| // Reparents |layer_| so that it's behind the layer of |window_|. |
| void ReparentLayer(); |
| |
| // Updates bounds and visibility of |layer_|. |
| void UpdateBoundsAndVisibility(); |
| |
| aura::Window* window_; |
| |
| // The layer to which the shadow is drawn. The layer is stacked beneath the |
| // layer of |window_|. |
| std::unique_ptr<ui::Layer> layer_; |
| |
| // Hit test value from last call to ShowForHitTest(). Used to prevent |
| // repeatedly triggering the same animations for the same hit. |
| int last_hit_test_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ResizeShadow); |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_WM_RESIZE_SHADOW_H_ |