Add the button style for combobox

ui/views/controls/combobox/combobox.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_VIEWS_CONTROLS_COMBOBOX_COMBOBOX_H_
 #define UI_VIEWS_CONTROLS_COMBOBOX_COMBOBOX_H_
 
 #include <string>
 
 #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 {
 class ComboboxModel;
 }
 
 namespace views {
 
 class ComboboxListener;
 class FocusableBorder;
 class MenuRunner;
 class PrefixSelector;
 
 // A non-editable combobox (aka a drop-down list or selector).

[sky, 2013/12/02 21:28:55]

Add description here of different behaviors. Maybe something like:
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).

[hajimehoshi, 2013/12/03 10:30:52]

Done. (also changed enum Style).

-class VIEWS_EXPORT Combobox
-    : public MenuDelegate,
-      public PrefixDelegate,
-      public ui::ComboboxModelObserver {
+class VIEWS_EXPORT Combobox : public MenuDelegate,
+                              public PrefixDelegate,
+                              public ui::ComboboxModelObserver,
+                              public gfx::AnimationDelegate {
  public:
+  // The visual style of the combobox. When the style is STYLE_BUTTONS, this
+  // combobox becames a clickable buttons.
+  enum Style {
+    STYLE_NORMAL,
+    STYLE_BUTTONS,
+  };
+
   // The combobox's class name.
   static const char kViewClassName[];
 
   // |model| is not owned by the combobox.
   explicit Combobox(ui::ComboboxModel* model);
   virtual ~Combobox();
 
   static const gfx::Font& GetFont();
 
   // 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();
 
   // Gets/Sets the selected index.
   int selected_index() const { return selected_index_; }
   void SetSelectedIndex(int index);
 
   // Looks for the first occurrence of |value| in |model()|. If found, selects
   // the found index and returns true. Otherwise simply noops and returns false.
   bool SelectValue(const base::string16& value);
 
   ui::ComboboxModel* model() const { return model_; }
 
   // Set the accessible name of the combobox.
   void SetAccessibleName(const string16& name);
 
   // Visually marks the combobox as having an invalid value selected.
   // When invalid, it paints with white text on a red background.
   // Callers are responsible for restoring validity with selection changes.
   void SetInvalid(bool invalid);
   bool invalid() const { return invalid_; }
 
   // Overridden from View:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE;
   virtual bool SkipDefaultKeyEventProcessing(const ui::KeyEvent& e) OVERRIDE;
   virtual bool OnMousePressed(const ui::MouseEvent& mouse_event) OVERRIDE;
   virtual bool OnMouseDragged(const ui::MouseEvent& mouse_event) OVERRIDE;
+  virtual void OnMouseReleased(const ui::MouseEvent& mouse_event) OVERRIDE;
+  virtual void OnMouseCaptureLost() OVERRIDE;
+  virtual void OnMouseEntered(const ui::MouseEvent& mouse_event) OVERRIDE;
+  virtual void OnMouseExited(const ui::MouseEvent& mouse_event) OVERRIDE;
+  virtual void OnMouseMoved(const ui::MouseEvent& mouse_event) OVERRIDE;
   virtual bool OnKeyPressed(const ui::KeyEvent& e) OVERRIDE;
   virtual bool OnKeyReleased(const ui::KeyEvent& e) OVERRIDE;
   virtual void OnGestureEvent(ui::GestureEvent* gesture) OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual void OnFocus() OVERRIDE;
   virtual void OnBlur() OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
   virtual ui::TextInputClient* GetTextInputClient() OVERRIDE;
 
   // Overridden from MenuDelegate:
   virtual bool IsItemChecked(int id) const OVERRIDE;
   virtual bool IsCommandEnabled(int id) const OVERRIDE;
   virtual void ExecuteCommand(int id) OVERRIDE;
   virtual bool GetAccelerator(int id, ui::Accelerator* accelerator) OVERRIDE;
 
   // Overridden from PrefixDelegate:
   virtual int GetRowCount() OVERRIDE;
   virtual int GetSelectedRow() OVERRIDE;
   virtual void SetSelectedRow(int row) OVERRIDE;
   virtual string16 GetTextForRow(int row) OVERRIDE;
 
   // Overriden from ComboboxModelObserver:
   virtual void OnModelChanged() OVERRIDE;
 
+  // Overriden from AnimationDelegate:
+  virtual void AnimationProgressed(const gfx::Animation* animation) OVERRIDE;
+
  private:
   // Updates the combobox's content from its model.
   void UpdateFromModel();
 
   // 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);
 
   // Called when the selection is changed by the user.
   void OnSelectionChanged();
 
   // 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();
+
+  // Sets the button states.
+  void SetButtonStates(Button::ButtonState text_button_state,
+                       Button::ButtonState arrow_button_state);
+
+  // Manipulate |animation| according to the button states.
+  void AnimateStateTransition(gfx::SlideAnimation* animation,
+                              Button::ButtonState from,
+                              Button::ButtonState to);
+
+  // Returns true if the point is in the text button when using the button
+  // sytle. Returns false if the style is not the button style.
+  bool InTextButton(const gfx::Point& point);
+
+  // Return true if the point is in the text button when using the button
+  // sytle. Returns true if the style is not the button style.
+  bool InArrowButton(const gfx::Point& point);
+
   // 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_;
 
   // The current selected index; -1 and means no selection.
   int selected_index_;
 
   // True when the selection is visually denoted as invalid.
   bool invalid_;
 
   // The accessible name of this combobox.
@@ skipping 18 matching lines @@
   // combobox was closed. The time is used for simulating menu behavior; that
   // is, if the menu is shown and the button is pressed, we need to close the
   // menu. There is no clean way to get the second click event because the
   // menu is displayed using a modal loop and, unlike regular menus in Windows,
   // the button is not part of the displayed menu.
   base::Time closed_time_;
 
   // The maximum dimensions of the content in the dropdown
   gfx::Size content_size_;
 
+  // The images that are used when |style_| is STYLE_BUTTONS. The first index
+  // means the state of unfocused or focused.
+  std::vector<const gfx::ImageSkia*>
+      body_button_images_[2][Button::STATE_COUNT];
+  std::vector<const gfx::ImageSkia*>
+      menu_button_images_[2][Button::STATE_COUNT];
+
+  // True if dragging started.
+  bool drag_started_;
+
+  // The location where dragging started.
+  gfx::Point drag_start_point_;
+
+  // The states of buttons like pressed or hovered.
+  Button::ButtonState text_button_state_;
+  Button::ButtonState arrow_button_state_;
+
+  // The animations to render the hovered buttons.
+  scoped_ptr<gfx::SlideAnimation> text_button_hover_animation_;
+  scoped_ptr<gfx::SlideAnimation> arrow_button_hover_animation_;
+
   DISALLOW_COPY_AND_ASSIGN(Combobox);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_COMBOBOX_COMBOBOX_H_