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