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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_INSTANT_INSTANT_UNLOAD_HANDLER_H_
#define CHROME_BROWSER_INSTANT_INSTANT_UNLOAD_HANDLER_H_
#include "base/basictypes.h"
#include "base/memory/scoped_vector.h"
class Browser;
class TabContents;
// InstantUnloadHandler ensures that the beforeunload and unload handlers are
// run when using Instant. When the user commits the Instant preview the
// existing TabContents is passed to RunUnloadListenersOrDestroy(). If the tab
// has no beforeunload or unload listeners, the tab is deleted; otherwise the
// beforeunload and unload listeners are executed. If the beforeunload listener
// shows a dialog the tab is added back to the tabstrip at its original location
// next to the Instant page.
class InstantUnloadHandler {
public:
explicit InstantUnloadHandler(Browser* browser);
~InstantUnloadHandler();
// See class description for details on what this does.
void RunUnloadListenersOrDestroy(TabContents* tab_contents, int index);
private:
class WebContentsDelegateImpl;
// Invoked if the tab is to be shown. This happens if the before unload
// listener returns a string.
void Activate(WebContentsDelegateImpl* delegate);
// Destroys the old tab. This is invoked if script tries to close the page.
void Destroy(WebContentsDelegateImpl* delegate);
// TODO(sky): Browser really needs to wait to close until there are no more
// tabs managed by InstantUnloadHandler.
Browser* const browser_;
ScopedVector<WebContentsDelegateImpl> delegates_;
DISALLOW_COPY_AND_ASSIGN(InstantUnloadHandler);
};
#endif // CHROME_BROWSER_INSTANT_INSTANT_UNLOAD_HANDLER_H_
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