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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.
#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 {
// 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);
// 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();
virtual ~LayerDelegate() {}
} // namespace ui