MacViews: Implement Window-modal dialogs using sheets

ui/views/examples/widget_example.cc

Index: ui/views/examples/widget_example.cc
diff --git a/ui/views/examples/widget_example.cc b/ui/views/examples/widget_example.cc
index d7a1b020d921164ab3fe5415e2833028d74e03e1..3a9506f52722b66397c68ce504025daa8f46a5ff 100644
--- a/ui/views/examples/widget_example.cc
+++ b/ui/views/examples/widget_example.cc
@@ -30,6 +30,17 @@ class DialogExample : public DialogDelegateView {
   View* CreateFootnoteView() override;
 };
 
+class ModalDialogExample : public DialogExample {
+ public:
+  ModalDialogExample() {}
+
+  // WidgetDelegate:
+  ui::ModalType GetModalType() const override { return ui::MODAL_TYPE_WINDOW; }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ModalDialogExample);
+};
+
 DialogExample::DialogExample() {
   set_background(Background::CreateSolidBackground(SK_ColorGRAY));
   SetLayoutManager(new BoxLayout(BoxLayout::kVertical, 10, 10, 10));
@@ -70,6 +81,7 @@ void WidgetExample::CreateExampleView(View* container) {
   container->SetLayoutManager(new BoxLayout(BoxLayout::kHorizontal, 0, 0, 10));
   BuildButton(container, "Popup widget", POPUP);
   BuildButton(container, "Dialog widget", DIALOG);
+  BuildButton(container, "Modal Dialog", MODAL_DIALOG);
 #if defined(OS_LINUX)
   // Windows does not support TYPE_CONTROL top-level widgets.
   BuildButton(container, "Child widget", CHILD);
@@ -116,6 +128,11 @@ void WidgetExample::ButtonPressed(Button* sender, const ui::Event& event) {
           sender->GetWidget()->GetNativeView())->Show();
       break;
     }
+    case MODAL_DIALOG: {
+      DialogDelegate::CreateDialogWidget(new ModalDialogExample(), NULL,
+          sender->GetWidget()->GetNativeView())->Show();
+      break;
+    }
     case CHILD:
       ShowWidget(sender, Widget::InitParams(Widget::InitParams::TYPE_CONTROL));
       break;