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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 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