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      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 class CommandLine;
     14 
     15 namespace base {
     16 class FilePath;
     17 }
     18 
     19 // Provides a ProcessSingleton::NotificationCallback that prevents
     20 // command-line handling when a modal dialog is active during startup. The
     21 // client must ensure that SetActiveModalDialog is called appropriately when
     22 // such dialogs are displayed or dismissed.
     23 //
     24 // While a dialog is active, the ProcessSingleton notification
     25 // callback will handle but ignore notifications:
     26 // 1. Neither this process nor the invoking process will handle the command
     27 //    line.
     28 // 2. The active dialog is brought to the foreground and/or the taskbar icon
     29 //    flashed (using ::SetForegroundWindow on Windows).
     30 //
     31 // Otherwise, the notification is forwarded to a wrapped NotificationCallback.
     32 class ProcessSingletonModalDialogLock {
     33  public:
     34   typedef base::Callback<void(gfx::NativeWindow)> SetForegroundWindowHandler;
     35   explicit ProcessSingletonModalDialogLock(
     36       const ProcessSingleton::NotificationCallback& original_callback);
     37 
     38   ProcessSingletonModalDialogLock(
     39       const ProcessSingleton::NotificationCallback& original_callback,
     40       const SetForegroundWindowHandler& set_foreground_window_handler);
     41 
     42   ~ProcessSingletonModalDialogLock();
     43 
     44   // Receives a handle to the active modal dialog, or NULL if the active dialog
     45   // is dismissed.
     46   void SetActiveModalDialog(gfx::NativeWindow active_dialog);
     47 
     48   // Returns the ProcessSingleton::NotificationCallback.
     49   // The callback is only valid during the lifetime of the
     50   // ProcessSingletonModalDialogLock instance.
     51   ProcessSingleton::NotificationCallback AsNotificationCallback();
     52 
     53  private:
     54   bool NotificationCallbackImpl(const CommandLine& command_line,
     55                                 const base::FilePath& current_directory);
     56 
     57   gfx::NativeWindow active_dialog_;
     58   ProcessSingleton::NotificationCallback original_callback_;
     59   SetForegroundWindowHandler set_foreground_window_handler_;
     60 
     61   DISALLOW_COPY_AND_ASSIGN(ProcessSingletonModalDialogLock);
     62 };
     63 
     64 #endif  // CHROME_BROWSER_PROCESS_SINGLETON_MODAL_DIALOG_LOCK_H_
     65