Add the button style for combobox

ui/views/controls/combobox/combobox.h

Index: ui/views/controls/combobox/combobox.h
diff --git a/ui/views/controls/combobox/combobox.h b/ui/views/controls/combobox/combobox.h
index 91469d8073e021cab6c41925d6cbca4f36c868b8..13e06d88949cdfe5b3507f9910ee70e97efa321e 100644
--- a/ui/views/controls/combobox/combobox.h
+++ b/ui/views/controls/combobox/combobox.h
@@ -9,12 +9,15 @@
 
 #include "base/time/time.h"
 #include "ui/base/models/combobox_model_observer.h"
+#include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/native_widget_types.h"
+#include "ui/views/controls/button/button.h"
 #include "ui/views/controls/menu/menu_delegate.h"
 #include "ui/views/controls/prefix_delegate.h"
 
 namespace gfx {
 class Font;
+class SlideAnimation;
 }
 
 namespace ui {
@@ -24,16 +27,28 @@ class ComboboxModel;
 namespace views {
 
 class ComboboxListener;
+class CustomButton;
 class FocusableBorder;
 class MenuRunner;
+class Painter;
 class PrefixSelector;
 
 // A non-editable combobox (aka a drop-down list or selector).
-class VIEWS_EXPORT Combobox
-    : public MenuDelegate,
-      public PrefixDelegate,
-      public ui::ComboboxModelObserver {
+// Combobox has two distinct parts, the drop down arrow and the text. When the
+// user clicks on the text the drop down is either shown
+// (STYLE_SHOW_DROP_DOWN_ON_CLICK) or the listener is notified
+// (STYLE_NOTIFY_ON_CLICK).
+class VIEWS_EXPORT Combobox : public MenuDelegate,
+                              public PrefixDelegate,
+                              public ui::ComboboxModelObserver,
+                              public ButtonListener {
  public:
+  // The style of the combobox.
+  enum Style {
+    STYLE_SHOW_DROP_DOWN_ON_CLICK,
+    STYLE_NOTIFY_ON_CLICK,
+  };
+
   // The combobox's class name.
   static const char kViewClassName[];
 
@@ -46,6 +61,8 @@ class VIEWS_EXPORT Combobox
   // Sets the listener which will be called when a selection has been made.
   void set_listener(ComboboxListener* listener) { listener_ = listener; }
 
+  void SetStyle(Style style);
+
   // Informs the combobox that its model changed.
   void ModelChanged();
 
@@ -82,6 +99,7 @@ class VIEWS_EXPORT Combobox
   virtual void OnBlur() OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
   virtual ui::TextInputClient* GetTextInputClient() OVERRIDE;
+  virtual void Layout() OVERRIDE;
 
   // Overridden from MenuDelegate:
   virtual bool IsItemChecked(int id) const OVERRIDE;
@@ -98,6 +116,9 @@ class VIEWS_EXPORT Combobox
   // Overriden from ComboboxModelObserver:
   virtual void OnModelChanged() OVERRIDE;
 
+  // Overriden from ButtonListener:
+  virtual void ButtonPressed(Button* sender, const ui::Event& event) OVERRIDE;
+
  private:
   // Updates the combobox's content from its model.
   void UpdateFromModel();
@@ -105,9 +126,12 @@ class VIEWS_EXPORT Combobox
   // Given bounds within our View, this helper mirrors the bounds if necessary.
   void AdjustBoundsForRTLUI(gfx::Rect* rect) const;
 
-  // Draw the selected value of the drop down list
+  // Draws the selected value of the drop down list
   void PaintText(gfx::Canvas* canvas);
 
+  // Draws the button images.
+  void PaintButtons(gfx::Canvas* canvas);
+
   // Show the drop down list
   void ShowDropDownMenu(ui::MenuSourceType source_type);
 
@@ -117,9 +141,18 @@ class VIEWS_EXPORT Combobox
   // Converts a menu command ID to a menu item index.
   int MenuCommandToIndex(int menu_command_id) const;
 
+  int GetDisclosureArrowLeftPadding() const;
+  int GetDisclosureArrowRightPadding() const;
+
+  // Handles the clicking event.
+  void HandleClickEvent();
+
   // Our model. Not owned.
   ui::ComboboxModel* model_;
 
+  // The visual style of this combobox.
+  Style style_;
+
   // Our listener. Not owned. Notified when the selected index change.
   ComboboxListener* listener_;
 
@@ -158,6 +191,22 @@ class VIEWS_EXPORT Combobox
   // The maximum dimensions of the content in the dropdown
   gfx::Size content_size_;
 
+  // The painters or images that are used when |style_| is STYLE_BUTTONS. The
+  // first index means the state of unfocused or focused.
+  // The images are owned by ResourceBundle.
+  scoped_ptr<Painter> body_button_painters_[2][Button::STATE_COUNT];
+  std::vector<const gfx::ImageSkia*>
+      menu_button_images_[2][Button::STATE_COUNT];
+
+  // The transparent buttons for button rendering. These are used only when
+  // |style_| is STYLE_SHOW_DROP_DOWN_ON_CLICK. These are placed on top of this
+  // combobox as child views, accept event and manage the button states. These
+  // are not rendered but a Combobox renders the button images according to
+  // these button states.
+  // The base View takes the ownerships of these as child views.
+  CustomButton* text_button_;
+  CustomButton* arrow_button_;
+
   DISALLOW_COPY_AND_ASSIGN(Combobox);
 };