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// Copyright (c) 2009 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_PAINTING_OBSERVER_H_
#define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_PAINTING_OBSERVER_H_
#pragma once
class BackingStore;
class RenderWidgetHost;
class SkBitmap;
namespace gfx {
class Size;
}
// This class can be used to observe painting events for a RenderWidgetHost.
// Its primary goal in Chrome is to allow thumbnails to be generated.
class RenderWidgetHostPaintingObserver {
public:
// Indicates the RenderWidgetHost is about to destroy the backing store. The
// backing store will still be valid when this call is made.
virtual void WidgetWillDestroyBackingStore(RenderWidgetHost* widget,
BackingStore* backing_store) = 0;
// Indicates that the RenderWidgetHost just updated the backing store.
virtual void WidgetDidUpdateBackingStore(RenderWidgetHost* widget) = 0;
// This notifies the painting observer that a PaintAtSizeACK was
// received.
virtual void WidgetDidReceivePaintAtSizeAck(
RenderWidgetHost* widget,
int tag,
const gfx::Size& size) = 0;
protected:
virtual ~RenderWidgetHostPaintingObserver() {}
};
#endif // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_PAINTING_OBSERVER_H_
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