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 CustomButton;
 class FocusableBorder;
 class MenuRunner;
 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[];
 
   // |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);
@@ skipping 16 matching lines @@
   virtual bool OnMousePressed(const ui::MouseEvent& mouse_event) OVERRIDE;
   virtual bool OnMouseDragged(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;
+  virtual void PreferredSizeChanged() 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 ButtonListener:
+  virtual void ButtonPressed(Button* sender, const ui::Event& event) 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();
+
   // 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];
+
+  // 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.
+  CustomButton* text_button_;

[sky, 2013/12/03 20:52:30]

Document ownership.

[hajimehoshi, 2013/12/04 06:30:02]

Done.

+  CustomButton* arrow_button_;
+
   DISALLOW_COPY_AND_ASSIGN(Combobox);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_COMBOBOX_COMBOBOX_H_