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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_UI_SAD_TAB_HELPER_H_
#define CHROME_BROWSER_UI_SAD_TAB_HELPER_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "chrome/browser/common/web_contents_user_data.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/web_contents_observer.h"
#if defined(OS_MACOSX)
#include "base/mac/foundation_util.h"
#endif
#if defined(OS_MACOSX)
class SadTabController;
#elif defined(TOOLKIT_VIEWS)
namespace views {
class Widget;
}
#elif defined(TOOLKIT_GTK)
class SadTabGtk;
#endif
// Per-tab class to manage sad tab views.
class SadTabHelper : public content::WebContentsObserver,
public content::NotificationObserver,
public WebContentsUserData<SadTabHelper> {
public:
virtual ~SadTabHelper();
// Platform specific function to determine if there is a current sad tab page.
bool HasSadTab() const;
#if defined(TOOLKIT_VIEWS)
views::Widget* sad_tab() { return sad_tab_.get(); }
#endif
private:
explicit SadTabHelper(content::WebContents* web_contents);
static int kUserDataKey;
friend class WebContentsUserData<SadTabHelper>;
// Platform specific function to get an instance of the sad tab page.
void InstallSadTab(base::TerminationStatus status);
// Overridden from content::WebContentsObserver:
virtual void RenderViewGone(base::TerminationStatus status) OVERRIDE;
// Overridden from content::NotificationObserver:
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// Used to get notifications about renderers coming and going.
content::NotificationRegistrar registrar_;
// The platform views used to render the sad tab, non-NULL if visible.
#if defined(OS_MACOSX)
class ScopedPtrRelease {
public:
inline void operator()(void* x) const {
base::mac::NSObjectRelease(x);
}
};
scoped_ptr_malloc<SadTabController, ScopedPtrRelease> sad_tab_;
#elif defined(TOOLKIT_VIEWS)
scoped_ptr<views::Widget> sad_tab_;
#elif defined(TOOLKIT_GTK)
scoped_ptr<SadTabGtk> sad_tab_;
#endif
DISALLOW_COPY_AND_ASSIGN(SadTabHelper);
};
#endif // CHROME_BROWSER_UI_SAD_TAB_HELPER_H_
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