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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 CHROME_BROWSER_THUMBNAILS_THUMBNAIL_TAB_HELPER_H_
#define CHROME_BROWSER_THUMBNAILS_THUMBNAIL_TAB_HELPER_H_
#include "base/basictypes.h"
#include "chrome/browser/thumbnails/thumbnailing_context.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/readback_types.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_contents_user_data.h"
namespace content {
class RenderViewHost;
class RenderWidgetHost;
}
class ThumbnailTabHelper
: public content::NotificationObserver,
public content::WebContentsObserver,
public content::WebContentsUserData<ThumbnailTabHelper> {
public:
~ThumbnailTabHelper() override;
// Enables or disables the function of taking thumbnails.
// A disabled ThumbnailTabHelper generates no thumbnails although it still
// continues to receive the notifications from the web contents.
void set_enabled(bool enabled) { enabled_ = enabled; }
private:
explicit ThumbnailTabHelper(content::WebContents* contents);
friend class content::WebContentsUserData<ThumbnailTabHelper>;
// content::NotificationObserver overrides.
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
// content::WebContentsObserver overrides.
void RenderViewDeleted(content::RenderViewHost* render_view_host) override;
void DidStartLoading() override;
void NavigationStopped() override;
// Update the thumbnail of the given tab contents if necessary.
void UpdateThumbnailIfNecessary(content::WebContents* web_contents);
// Called when a render view host was created for a WebContents.
void RenderViewHostCreated(content::RenderViewHost* renderer);
// Indicates that the given widget has changed is visibility.
void WidgetHidden(content::RenderWidgetHost* widget);
bool enabled_;
content::NotificationRegistrar registrar_;
bool load_interrupted_;
DISALLOW_COPY_AND_ASSIGN(ThumbnailTabHelper);
};
#endif // CHROME_BROWSER_THUMBNAILS_THUMBNAIL_TAB_HELPER_H_
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