ash uber tray: Make the tray background rounded.

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 8862e810bf58963f6255245ee3b19f9d1f46fb3c..ccf1f21caefd40a58af5bdcfa30a8434e279d3c5 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -19,6 +19,7 @@
 #include "third_party/skia/include/core/SkPaint.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/skia_util.h"
 #include "ui/views/border.h"
 #include "ui/views/bubble/bubble_delegate.h"
 #include "ui/views/controls/label.h"
@@ -41,6 +42,9 @@ const SkColor kLightColor = SkColorSetRGB(240, 240, 240);
 const SkColor kBackgroundColor = SK_ColorWHITE;
 const SkColor kShadowColor = SkColorSetARGB(25, 0, 0, 0);
 
+const SkColor kTrayBackgroundColor = SkColorSetARGB(100, 0, 0, 0);
+const SkColor kTrayBackgroundHover = SkColorSetARGB(150, 0, 0, 0);
+
 class SystemTrayBubbleBackground : public views::Background {
  public:
   explicit SystemTrayBubbleBackground(views::View* owner)
@@ -229,6 +233,32 @@ class SystemTrayBubble : public views::BubbleDelegateView {
   DISALLOW_COPY_AND_ASSIGN(SystemTrayBubble);
 };
 
+class SystemTrayBackground : public views::Background {
+ public:
+  SystemTrayBackground() : hovering_(false) {}
+  virtual ~SystemTrayBackground() {}
+
+  void set_hovering(bool hover) { hovering_ = hover; }
+
+ private:
+  // Overridden from views::Background.
+  virtual void Paint(gfx::Canvas* canvas, views::View* view) const OVERRIDE {
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    paint.setStyle(SkPaint::kFill_Style);
+    paint.setColor(hovering_ ? kTrayBackgroundHover : kTrayBackgroundColor);
+    SkPath path;
+    gfx::Rect bounds(view->GetContentsBounds());
+    SkScalar radius = SkIntToScalar(4);
+    path.addRoundRect(gfx::RectToSkRect(bounds), radius, radius);
+    canvas->GetSkCanvas()->drawPath(path, paint);
+  }
+
+  bool hovering_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemTrayBackground);
+};
+
 }  // namespace internal
 
 SystemTray::SystemTray()
@@ -237,8 +267,8 @@ SystemTray::SystemTray()
       popup_(NULL) {
   SetLayoutManager(new views::BoxLayout(views::BoxLayout::kHorizontal,
       5, 0, 3));
-  set_background(views::Background::CreateSolidBackground(
-      SkColorSetARGB(127, 0, 0, 0)));
+  set_background(new SystemTrayBackground);
+  set_notify_enter_exit_on_child(true);
 }
 
 SystemTray::~SystemTray() {
@@ -320,6 +350,16 @@ bool SystemTray::OnMousePressed(const views::MouseEvent& event) {
   return true;
 }
 
+void SystemTray::OnMouseEntered(const views::MouseEvent& event) {
+  static_cast<SystemTrayBackground*>(background())->set_hovering(true);
+  SchedulePaint();
+}
+
+void SystemTray::OnMouseExited(const views::MouseEvent& event) {
+  static_cast<SystemTrayBackground*>(background())->set_hovering(false);
+  SchedulePaint();
+}
+
 void SystemTray::OnWidgetClosing(views::Widget* widget) {
   CHECK_EQ(popup_, widget);
   popup_ = NULL;