instant_unload_handler.h revision ddb351dbec246cf1fab5ec20d2d5520909041de1 
1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_INSTANT_INSTANT_UNLOAD_HANDLER_H_
6#define CHROME_BROWSER_INSTANT_INSTANT_UNLOAD_HANDLER_H_
7#pragma once
8
9#include "base/memory/scoped_vector.h"
10
11class Browser;
12class TabContentsWrapper;
13
14// InstantUnloadHandler makes sure the before unload and unload handler is run
15// when using instant. When the user commits the instant preview the existing
16// TabContentsWrapper is passed to |RunUnloadListenersOrDestroy|. If the tab has
17// no before unload or unload listener the tab is deleted, otherwise the before
18// unload and unload listener is executed. If the before unload listener shows a
19// dialog the tab is added back to the tabstrip at its original location next to
20// the instant page.
21class InstantUnloadHandler {
22 public:
23  explicit InstantUnloadHandler(Browser* browser);
24  ~InstantUnloadHandler();
25
26  // See class description for details on what this does.
27  void RunUnloadListenersOrDestroy(TabContentsWrapper* tab_contents, int index);
28
29 private:
30  class TabContentsDelegateImpl;
31
32  // Invoked if the tab is to be shown. This happens if the before unload
33  // listener returns a string.
34  void Activate(TabContentsDelegateImpl* delegate);
35
36  // Destroys the old tab. This is invoked if script tries to close the page.
37  void Destroy(TabContentsDelegateImpl* delegate);
38
39  // TODO(sky): browser really needs to wait to close until there are no more
40  // tabs managed by InstantUnloadHandler.
41  Browser* browser_;
42
43  ScopedVector<TabContentsDelegateImpl> delegates_;
44
45  DISALLOW_COPY_AND_ASSIGN(InstantUnloadHandler);
46};
47
48#endif  // CHROME_BROWSER_INSTANT_INSTANT_UNLOAD_HANDLER_H_
49