MenuButton: support Mac look & feel

ui/views/examples/menu_example.cc

Index: ui/views/examples/menu_example.cc
diff --git a/ui/views/examples/menu_example.cc b/ui/views/examples/menu_example.cc
index 378c90a76bc00ec2ea86194b5851693ccc39ef20..f8c322a62e7ef1eeba0f1f37d0ef13e1c2ddf9ae 100644
--- a/ui/views/examples/menu_example.cc
+++ b/ui/views/examples/menu_example.cc
@@ -12,7 +12,7 @@
 #include "ui/views/controls/button/menu_button.h"
 #include "ui/views/controls/button/menu_button_listener.h"
 #include "ui/views/controls/menu/menu_runner.h"
-#include "ui/views/layout/fill_layout.h"
+#include "ui/views/layout/box_layout.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
@@ -60,9 +60,15 @@ class ExampleMenuModel : public ui::SimpleMenuModel,
 
 class ExampleMenuButton : public MenuButton, public MenuButtonListener {
  public:
-  explicit ExampleMenuButton(const base::string16& test);
+  ExampleMenuButton(const base::string16& test,
+                    bool use_border,
+                    bool use_background);
   ~ExampleMenuButton() override;
 
+ protected:
+  bool ShouldUsePlatformStyleBackground() const override;
+  bool ShouldUsePlatformStyleBorder() const override;
+
  private:
   // MenuButtonListener:
   void OnMenuButtonClicked(MenuButton* source,
@@ -74,6 +80,9 @@ class ExampleMenuButton : public MenuButton, public MenuButtonListener {
   std::unique_ptr<ExampleMenuModel> menu_model_;
   std::unique_ptr<MenuRunner> menu_runner_;
 
+  bool use_background_;
+  bool use_border_;
+
   DISALLOW_COPY_AND_ASSIGN(ExampleMenuButton);
 };
 
@@ -179,8 +188,12 @@ void ExampleMenuModel::ExecuteCommand(int command_id, int event_flags) {
 
 // ExampleMenuButton -----------------------------------------------------------
 
-ExampleMenuButton::ExampleMenuButton(const base::string16& test)
-    : MenuButton(test, this, true) {}
+ExampleMenuButton::ExampleMenuButton(const base::string16& test,
+                                     bool use_background,
+                                     bool use_border)
+    : MenuButton(test, this, true),
+      use_background_(use_background),
+      use_border_(use_border) {}
 
 ExampleMenuButton::~ExampleMenuButton() {
 }
@@ -206,6 +219,14 @@ ui::SimpleMenuModel* ExampleMenuButton::GetMenuModel() {
   return menu_model_.get();
 }
 
+bool ExampleMenuButton::ShouldUsePlatformStyleBackground() const {
+  return use_background_;
+}
+
+bool ExampleMenuButton::ShouldUsePlatformStyleBorder() const {
+  return use_border_;
+}
+
 }  // namespace
 
 MenuExample::MenuExample() : ExampleBase("Menu") {
@@ -217,9 +238,18 @@ MenuExample::~MenuExample() {
 void MenuExample::CreateExampleView(View* container) {
   // We add a button to open a menu.
   ExampleMenuButton* menu_button = new ExampleMenuButton(
-      ASCIIToUTF16("Open a menu"));
-  container->SetLayoutManager(new FillLayout);
+      ASCIIToUTF16("Open a menu (no decoration)"), false, false);
+  ExampleMenuButton* background_button = new ExampleMenuButton(
+      ASCIIToUTF16("Open a menu (background only)"), true, false);
+  ExampleMenuButton* border_button = new ExampleMenuButton(
+      ASCIIToUTF16("Open a menu (border only)"), false, true);
+  ExampleMenuButton* both_button = new ExampleMenuButton(
+      ASCIIToUTF16("Open a menu (both decorations)"), true, true);
+  container->SetLayoutManager(new BoxLayout(BoxLayout::kVertical, 1, 1, 1));
   container->AddChildView(menu_button);
+  container->AddChildView(background_button);
+  container->AddChildView(border_button);
+  container->AddChildView(both_button);
 }
 
 }  // namespace examples