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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef ASH_COMMON_WM_FORWARDING_LAYER_DELEGATE_H_ |
| 6 #define ASH_COMMON_WM_FORWARDING_LAYER_DELEGATE_H_ |
| 7 |
| 8 #include "base/macros.h" |
| 9 #include "ui/compositor/layer_delegate.h" |
| 10 |
| 11 namespace ui { |
| 12 class Layer; |
| 13 } |
| 14 |
| 15 namespace ash { |
| 16 |
| 17 class WmWindow; |
| 18 |
| 19 namespace wm { |
| 20 |
| 21 // A layer delegate to paint the content of a recreated layer by delegating |
| 22 // the paint request to the original delegate. It checks if the original |
| 23 // delegate is still valid by traversing the original layers. |
| 24 class ForwardingLayerDelegate : public ui::LayerDelegate { |
| 25 public: |
| 26 ForwardingLayerDelegate(WmWindow* original_window, |
| 27 ui::LayerDelegate* delegate); |
| 28 ~ForwardingLayerDelegate() override; |
| 29 |
| 30 private: |
| 31 bool IsDelegateValid(ui::Layer* layer) const; |
| 32 |
| 33 // ui:LayerDelegate: |
| 34 void OnPaintLayer(const ui::PaintContext& context) override; |
| 35 void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override; |
| 36 void OnDeviceScaleFactorChanged(float device_scale_factor) override; |
| 37 base::Closure PrepareForLayerBoundsChange() override; |
| 38 |
| 39 WmWindow* original_window_; |
| 40 ui::LayerDelegate* original_delegate_; |
| 41 |
| 42 DISALLOW_COPY_AND_ASSIGN(ForwardingLayerDelegate); |
| 43 }; |
| 44 |
| 45 } // namespace wm |
| 46 } // namespace ash |
| 47 |
| 48 #endif // ASH_COMMON_WM_FORWARDING_LAYER_DELEGATE_H_ |
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