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// Copyright 2013 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 CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_SCREENSHOT_MANAGER_H_
#define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_SCREENSHOT_MANAGER_H_
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
class SkBitmap;
namespace content {
class NavigationControllerImpl;
class NavigationEntryImpl;
class RenderViewHost;
class ScreenshotData;
// NavigationEntryScreenshotManager takes care of taking image-captures for the
// current navigation entry of a NavigationControllerImpl, and managing these
// captured images. These image-captures are used for history navigation using
// overscroll gestures.
class CONTENT_EXPORT NavigationEntryScreenshotManager {
public:
explicit NavigationEntryScreenshotManager(
NavigationControllerImpl* controller);
virtual ~NavigationEntryScreenshotManager();
// Takes a screenshot of the last-committed entry of the controller.
void TakeScreenshot();
// Clears screenshots of all navigation entries.
void ClearAllScreenshots();
protected:
virtual void TakeScreenshotImpl(RenderViewHost* host,
NavigationEntryImpl* entry);
// Called after a screenshot has been set on an NavigationEntryImpl.
// Overridden in tests to get notified of when a screenshot is set.
virtual void OnScreenshotSet(NavigationEntryImpl* entry);
NavigationControllerImpl* owner() { return owner_; }
void SetMinScreenshotIntervalMS(int interval_ms);
// The callback invoked when taking the screenshot of the page is complete.
// This sets the screenshot on the navigation entry.
void OnScreenshotTaken(int unique_id,
bool success,
const SkBitmap& bitmap);
// Returns the number of entries with screenshots.
int GetScreenshotCount() const;
private:
// This is called when the screenshot data has beene encoded to PNG in a
// worker thread.
void OnScreenshotEncodeComplete(int unique_id,
scoped_refptr<ScreenshotData> data);
// Removes the screenshot for the entry, returning true if the entry had a
// screenshot.
bool ClearScreenshot(NavigationEntryImpl* entry);
// The screenshots in the NavigationEntryImpls can accumulate and consume a
// large amount of memory. This function makes sure that the memory
// consumption is within a certain limit.
void PurgeScreenshotsIfNecessary();
// The navigation controller that owns this screenshot-manager.
NavigationControllerImpl* owner_;
// Taking a screenshot and encoding them can be async. So use a weakptr for
// the callback to make sure that the screenshot/encoding completion callback
// does not trigger on a destroyed NavigationEntryScreenshotManager.
base::WeakPtrFactory<NavigationEntryScreenshotManager> screenshot_factory_;
base::Time last_screenshot_time_;
int min_screenshot_interval_ms_;
DISALLOW_COPY_AND_ASSIGN(NavigationEntryScreenshotManager);
};
} // namespace content
#endif // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_SCREENSHOT_MANAGER_H_
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