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- // 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 UI_COMPOSITOR_LAYER_DELEGATE_H_
- #define UI_COMPOSITOR_LAYER_DELEGATE_H_
- #include "ui/compositor/compositor_export.h"
- #include "ui/compositor/property_change_reason.h"
- namespace gfx {
- class Rect;
- class Transform;
- }
- namespace ui {
- class PaintContext;
- // A delegate interface implemented by an object that renders to a Layer.
- class COMPOSITOR_EXPORT LayerDelegate {
- public:
- // Paint content for the layer to the specified context.
- virtual void OnPaintLayer(const PaintContext& context) = 0;
- // Called when the layer's device scale factor has changed.
- virtual void OnDeviceScaleFactorChanged(float old_device_scale_factor,
- float new_device_scale_factor) = 0;
- // Invoked when the bounds are set. |reason| indicates whether the bounds were
- // set directly or by an animation. This will be called at every step of a
- // bounds animation.
- virtual void OnLayerBoundsChanged(const gfx::Rect& old_bounds,
- PropertyChangeReason reason);
- // Invoked when the transform or opacity is set. |reason| indicates whether
- // the property was set directly or by an animation. This will be called
- // before the first frame of an animation is rendered and when the animation
- // ends, but not necessarily at every frame of the animation.
- virtual void OnLayerTransformed(const gfx::Transform& old_transform,
- PropertyChangeReason reason);
- virtual void OnLayerOpacityChanged(PropertyChangeReason reason);
- // Invoked when the alpha shape is set.
- virtual void OnLayerAlphaShapeChanged();
- // Invoked when whether the layer fills its bounds opaquely or not changed.
- // |reason| indicates whether the property was changed directly or by an
- // animation.
- virtual void OnLayerFillsBoundsOpaquelyChanged(PropertyChangeReason reason);
- // Invoked when the clip rect is set. |reason| indicates whether the clip rect
- // was set directly or by an animation. This will be called at every step of a
- // clip rect animation.
- virtual void OnLayerClipRectChanged(const gfx::Rect& old_rect,
- PropertyChangeReason reason);
- // Called when it is a good opportunity for the delegate to update any visual
- // state or schedule any additional regions to be painted. Soon after this is
- // called OnPaintLayer() is called.
- virtual void UpdateVisualState();
- protected:
- virtual ~LayerDelegate() {}
- };
- } // namespace ui
- #endif // UI_COMPOSITOR_LAYER_DELEGATE_H_
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