1// Copyright (c) 2013 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_PROCESS_SINGLETON_MODAL_DIALOG_LOCK_H_
6#define CHROME_BROWSER_PROCESS_SINGLETON_MODAL_DIALOG_LOCK_H_
7
8#include "base/basictypes.h"
9#include "base/callback_forward.h"
10#include "chrome/browser/process_singleton.h"
11#include "ui/gfx/native_widget_types.h"
12
13namespace base {
14class CommandLine;
15class FilePath;
16}
17
18// Provides a ProcessSingleton::NotificationCallback that prevents
19// command-line handling when a modal dialog is active during startup. The
20// client must ensure that SetActiveModalDialog is called appropriately when
21// such dialogs are displayed or dismissed.
22//
23// While a dialog is active, the ProcessSingleton notification
24// callback will handle but ignore notifications:
25// 1. Neither this process nor the invoking process will handle the command
26//    line.
27// 2. The active dialog is brought to the foreground and/or the taskbar icon
28//    flashed (using ::SetForegroundWindow on Windows).
29//
30// Otherwise, the notification is forwarded to a wrapped NotificationCallback.
31class ProcessSingletonModalDialogLock {
32 public:
33  typedef base::Callback<void(gfx::NativeWindow)> SetForegroundWindowHandler;
34  explicit ProcessSingletonModalDialogLock(
35      const ProcessSingleton::NotificationCallback& original_callback);
36
37  ProcessSingletonModalDialogLock(
38      const ProcessSingleton::NotificationCallback& original_callback,
39      const SetForegroundWindowHandler& set_foreground_window_handler);
40
41  ~ProcessSingletonModalDialogLock();
42
43  // Receives a handle to the active modal dialog, or NULL if the active dialog
44  // is dismissed.
45  void SetActiveModalDialog(gfx::NativeWindow active_dialog);
46
47  // Returns the ProcessSingleton::NotificationCallback.
48  // The callback is only valid during the lifetime of the
49  // ProcessSingletonModalDialogLock instance.
50  ProcessSingleton::NotificationCallback AsNotificationCallback();
51
52 private:
53  bool NotificationCallbackImpl(const base::CommandLine& command_line,
54                                const base::FilePath& current_directory);
55
56  gfx::NativeWindow active_dialog_;
57  ProcessSingleton::NotificationCallback original_callback_;
58  SetForegroundWindowHandler set_foreground_window_handler_;
59
60  DISALLOW_COPY_AND_ASSIGN(ProcessSingletonModalDialogLock);
61};
62
63#endif  // CHROME_BROWSER_PROCESS_SINGLETON_MODAL_DIALOG_LOCK_H_
64