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// Copyright (c) 2011 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_PRERENDER_PRERENDER_TAB_HELPER_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
#include "content/browser/tab_contents/tab_contents_observer.h"
#include "base/time.h"
class TabContentsWrapper;
class GURL;
namespace prerender {
class PrerenderContents;
class PrerenderManager;
// PrerenderTabHelper is responsible for recording perceived pageload times
// to compare PLT's with prerendering enabled and disabled.
class PrerenderTabHelper : public TabContentsObserver {
public:
explicit PrerenderTabHelper(TabContentsWrapper* tab);
virtual ~PrerenderTabHelper();
// TabContentsObserver implementation.
virtual void ProvisionalChangeToMainFrameUrl(
const GURL& url,
const GURL& opener_url) OVERRIDE;
virtual void DidStopLoading() OVERRIDE;
virtual void DidStartProvisionalLoadForFrame(
int64 frame_id,
bool is_main_frame,
const GURL& validated_url,
bool is_error_page,
RenderViewHost* render_view_host) OVERRIDE;
// Called when this prerendered TabContents has just been swapped in.
void PrerenderSwappedIn();
void UpdateTargetURL(int32 page_id, const GURL& url);
private:
// The data we store for a hover (time the hover occurred & URL).
class HoverData;
// Retrieves the PrerenderManager, or NULL, if none was found.
PrerenderManager* MaybeGetPrerenderManager() const;
// Checks with the PrerenderManager if the specified URL has been preloaded,
// and if so, swap the RenderViewHost with the preload into this TabContents
// object. |opener_url| denotes the window.opener url that is set for this
// tab and is empty if there is no opener set.
bool MaybeUsePrerenderedPage(const GURL& url, const GURL& opener_url);
// Returns whether the TabContents being observed is currently prerendering.
bool IsPrerendering();
// Records histogram information for the current hover, based on whether
// it was used or not. Will not do anything if there is no current hover.
// Also resets the hover to no hover.
void MaybeLogCurrentHover(bool was_used);
bool IsTopSite(const GURL& url);
// TabContentsWrapper we're created for.
TabContentsWrapper* tab_;
// System time at which the current load was started for the purpose of
// the perceived page load time (PPLT).
base::TimeTicks pplt_load_start_;
// Information about the last hover for each hover threshold.
scoped_array<HoverData> last_hovers_;
// Information about the current hover independent of thresholds.
GURL current_hover_url_;
base::TimeTicks current_hover_time_;
// Current URL being loaded.
GURL url_;
DISALLOW_COPY_AND_ASSIGN(PrerenderTabHelper);
};
} // namespace prerender
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_TAB_HELPER_H_
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