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 13 namespace base { 14 class CommandLine; 15 class 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. 31 class 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