Implement window.alert() and its cousins for extensions....

chrome/browser/app_modal_dialog.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_APP_MODAL_DIALOG_H_
 #define CHROME_BROWSER_APP_MODAL_DIALOG_H_
 
 #include <string>
 
 #include "build/build_config.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 
 #if defined(OS_WIN)
 class JavascriptMessageBoxDialog;
 typedef JavascriptMessageBoxDialog* NativeDialog;
 #elif defined(OS_LINUX)
 typedef struct _GtkWidget GtkWidget;
 typedef GtkWidget* NativeDialog;
 #elif defined(OS_MACOSX)
 typedef void* NativeDialog;
 #endif
 
-class TabContents;
+class JavaScriptMessageBoxClient;
 namespace IPC {
 class Message;
 }
 
 // A controller+model class for javascript alert, confirm, prompt, and
 // onbeforeunload dialog boxes.  |NativeDialog| is a platform specific
 // view.
 class AppModalDialog : public NotificationObserver {
  public:
   // A union of data necessary to determine the type of message box to
   // show.  |dialog_flags| is a MessageBox flag.
-  AppModalDialog(TabContents* tab_contents,
+  AppModalDialog(JavaScriptMessageBoxClient* client,
                  const std::wstring& title,
                  int dialog_flags,
                  const std::wstring& message_text,
                  const std::wstring& default_prompt_text,
                  bool display_suppress_checkbox,
                  bool is_before_unload_dialog,
                  IPC::Message* reply_msg);
   ~AppModalDialog();
 
   // Called by the app modal window queue when it is time to show this window.
   void ShowModalDialog();
 
   /////////////////////////////////////////////////////////////////////////////
   // The following methods are platform specific and should be implemented in
   // the platform specific .cc files.
   // Create the platform specific NativeDialog and display it.  When the
   // NativeDialog is closed, it should call OnAccept or OnCancel to notify the
   // renderer of the user's action.  The NativeDialog is also expected to
   // delete the AppModalDialog associated with it.
   void CreateAndShowDialog();
 
   // Close the dialog if it is showing.
   void CloseModalDialog();
 
   // Called by the app modal window queue to activate the window.
   void ActivateModalDialog();
 
   /////////////////////////////////////////////////////////////////////////////
   // Getters so NativeDialog can get information about the message box.
-  TabContents* tab_contents() {
-    return tab_contents_;
+  JavaScriptMessageBoxClient* client() {
+    return client_;
   }
   int dialog_flags() {
     return dialog_flags_;
   }
   std::wstring title() {
     return title_;
   }
   bool is_before_unload_dialog() {
     return is_before_unload_dialog_;
   }
@@ skipping 18 matching lines @@
                        const NotificationDetails& details);
 
   // Sends APP_MODAL_DIALOG_CLOSED notification.
   void SendCloseNotification();
 
   NotificationRegistrar registrar_;
 
   // A reference to the platform native dialog box.
   NativeDialog dialog_;
 
+  // An implementation of the client interface to provide supporting methods
+  // and receive results.
+  JavaScriptMessageBoxClient* client_;
+
+  // True if the dialog should no longer be shown, e.g. because the underlying
+  // tab navigated away while the dialog was queued.
+  bool skip_this_dialog_;
+
   // Information about the message box is held in the following variables.
-  TabContents* tab_contents_;
   std::wstring title_;
   int dialog_flags_;
   std::wstring message_text_;
   std::wstring default_prompt_text_;
   bool display_suppress_checkbox_;
   bool is_before_unload_dialog_;
   IPC::Message* reply_msg_;
 };
 
 #endif  // #ifndef CHROME_BROWSER_APP_MODAL_DIALOG_H_