1 // Copyright (c) 2012 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 UI_COMPOSITOR_LAYER_DELEGATE_H_ 6 #define UI_COMPOSITOR_LAYER_DELEGATE_H_ 7 8 #include "base/callback_forward.h" 9 #include "ui/compositor/compositor_export.h" 10 11 namespace gfx { 12 class Canvas; 13 class Rect; 14 } 15 16 namespace ui { 17 18 // A delegate interface implemented by an object that renders to a Layer. 19 class COMPOSITOR_EXPORT LayerDelegate { 20 public: 21 // Paint content for the layer to the specified canvas. It has already been 22 // clipped to the Layer's invalid rect. 23 virtual void OnPaintLayer(gfx::Canvas* canvas) = 0; 24 25 // A notification that this layer has had a delegated frame swap and 26 // will be repainted. 27 virtual void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) = 0; 28 29 // Called when the layer's device scale factor has changed. 30 virtual void OnDeviceScaleFactorChanged(float device_scale_factor) = 0; 31 32 // Invoked prior to the bounds changing. The returned closured is run after 33 // the bounds change. 34 virtual base::Closure PrepareForLayerBoundsChange() = 0; 35 36 protected: ~LayerDelegate()37 virtual ~LayerDelegate() {} 38 }; 39 40 } // namespace ui 41 42 #endif // UI_COMPOSITOR_LAYER_DELEGATE_H_ 43