thestig@chromium.org
431dc5a0d1
TBR=evmar Review URL: http://codereview.chromium.org/149471 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20406 0039d316-1c4b-4281-b951-d872f2087c98
81 linhas
3.0 KiB
C++
81 linhas
3.0 KiB
C++
// Copyright (c) 2009 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
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#define CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
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#include "base/basictypes.h"
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#include "base/timer.h"
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#include "chrome/browser/renderer_host/render_widget_host_painting_observer.h"
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#include "chrome/common/notification_observer.h"
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#include "chrome/common/notification_registrar.h"
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class RenderWidgetHost;
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class SkBitmap;
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// This class MUST be destroyed after the RenderWidgetHosts, since it installs
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// a painting observer that is not removed.
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class ThumbnailGenerator : public RenderWidgetHostPaintingObserver,
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public NotificationObserver {
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public:
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// This class will do nothing until you call StartThumbnailing.
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ThumbnailGenerator();
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~ThumbnailGenerator();
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// Ensures that we're properly hooked in to generated thumbnails. This can
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// be called repeatedly and with wild abandon to no ill effect.
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void StartThumbnailing();
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SkBitmap GetThumbnailForRenderer(RenderWidgetHost* renderer) const;
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#ifdef UNIT_TEST
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// When true, the class will not use a timeout to do the expiration. This
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// will cause expiration to happen on the next run of the message loop.
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// Unit tests case use this to test expiration by choosing when the message
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// loop runs.
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void set_no_timeout(bool no_timeout) { no_timeout_ = no_timeout; }
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#endif
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private:
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// RenderWidgetHostPaintingObserver implementation.
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virtual void WidgetWillDestroyBackingStore(RenderWidgetHost* widget,
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BackingStore* backing_store);
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virtual void WidgetDidUpdateBackingStore(RenderWidgetHost* widget);
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// NotificationObserver interface.
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virtual void Observe(NotificationType type,
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const NotificationSource& source,
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const NotificationDetails& details);
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// Indicates that the given widget has changed is visibility.
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void WidgetShown(RenderWidgetHost* widget);
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void WidgetHidden(RenderWidgetHost* widget);
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// Called when the given widget is destroyed.
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void WidgetDestroyed(RenderWidgetHost* widget);
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// Timer function called on a delay after a tab has been shown. It will
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// invalidate the thumbnail for hosts with expired thumbnails in shown_hosts_.
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void ShownDelayHandler();
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// Removes the given host from the shown_hosts_ list, if it is there.
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void EraseHostFromShownList(RenderWidgetHost* host);
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NotificationRegistrar registrar_;
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base::OneShotTimer<ThumbnailGenerator> timer_;
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// A list of all RWHs that have been shown and need to have their thumbnail
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// expired at some time in the future with the "slop" time has elapsed. This
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// list will normally have 0 or 1 items in it.
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std::vector<RenderWidgetHost*> shown_hosts_;
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// See the setter above.
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bool no_timeout_;
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DISALLOW_COPY_AND_ASSIGN(ThumbnailGenerator);
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};
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#endif // CHROME_BROWSER_TAB_CONTENTS_THUMBNAIL_GENERATOR_H_
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