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

chrome/browser/views/jsmessage_box_dialog.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/browser/views/jsmessage_box_dialog.h"
 
 #include "app/l10n_util.h"
 #include "app/message_box_flags.h"
 #include "base/keyboard_codes.h"
 #include "chrome/browser/app_modal_dialog.h"
@@ skipping 19 matching lines @@
   if (display_suppress_checkbox) {
     message_box_view_->SetCheckBoxLabel(
         l10n_util::GetString(IDS_JAVASCRIPT_MESSAGEBOX_SUPPRESS_OPTION));
   }
 }
 
 JavascriptMessageBoxDialog::~JavascriptMessageBoxDialog() {
 }
 
 void JavascriptMessageBoxDialog::ShowModalDialog() {
-  HWND root_hwnd = GetAncestor(tab_contents()->GetNativeView(),
-                               GA_ROOT);
-  dialog_ = views::Window::CreateChromeWindow(root_hwnd, gfx::Rect(), this);
-  dialog_->Show();
+  gfx::NativeWindow root_hwnd = client()->GetMessageBoxRootWindow();
+  // GetMessageBoxRootWindow() will be NULL if there's no selected tab (e.g.,
+  // during shutdown), in which case we simply skip showing this dialog.
+  if (!root_hwnd) {
+    Cancel();
+  } else {
+    dialog_ = views::Window::CreateChromeWindow(root_hwnd, gfx::Rect(), this);
+    dialog_->Show();
+  }
 }
 
 void JavascriptMessageBoxDialog::ActivateModalDialog() {
   // Ensure that the dialog is visible and at the top of the z-order. These
   // conditions may not be true if the dialog was opened on a different virtual
   // desktop to the one the browser window is on.
   dialog_->Show();
   dialog_->Activate();
 }
 
@@ skipping 11 matching lines @@
   if (parent_->dialog_flags() & MessageBoxFlags::kFlagHasOKButton)
     dialog_buttons = MessageBoxFlags::DIALOGBUTTON_OK;
 
   if (parent_->dialog_flags() & MessageBoxFlags::kFlagHasCancelButton)
     dialog_buttons |= MessageBoxFlags::DIALOGBUTTON_CANCEL;
 
   return dialog_buttons;
 }
 
 std::wstring JavascriptMessageBoxDialog::GetWindowTitle() const {
-  return parent_->title();;
+  return parent_->title();
 }
 
 
 void JavascriptMessageBoxDialog::WindowClosing() {
   dialog_ = NULL;
-
 }
 
 void JavascriptMessageBoxDialog::DeleteDelegate() {
   delete parent_;
   delete this;
 }
 
 bool JavascriptMessageBoxDialog::Cancel() {
   parent_->OnCancel();
   return true;
@@ skipping 27 matching lines @@
 
 views::View* JavascriptMessageBoxDialog::GetContentsView() {
   return message_box_view_;
 }
 
 views::View* JavascriptMessageBoxDialog::GetInitiallyFocusedView() {
   if (message_box_view_->text_box())
     return message_box_view_->text_box();
   return views::DialogDelegate::GetInitiallyFocusedView();
 }