text: // Copyright (c) 2011 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_BUTTON_BUTTON_H_
  #define UI_VIEWS_CONTROLS_BUTTON_BUTTON_H_
  
  #include "base/macros.h"
  #include "ui/native_theme/native_theme.h"
  #include "ui/views/view.h"
  
  namespace views {
  
  class Button;
  class Event;
  
  // An interface implemented by an object to let it know that a button was
  // pressed.
  class VIEWS_EXPORT ButtonListener {
   public:
    virtual void ButtonPressed(Button* sender, const ui::Event& event) = 0;
  
   protected:
    virtual ~ButtonListener() {}
  };
  
  // A View representing a button. Depending on the specific type, the button
  // could be implemented by a native control or custom rendered.
  class VIEWS_EXPORT Button : public View {
   public:
    ~Button() override;
  
    // Button states for various button sub-types.
    enum ButtonState {
      STATE_NORMAL = 0,
      STATE_HOVERED,
      STATE_PRESSED,
      STATE_DISABLED,
      STATE_COUNT,
    };
  
    // Button styles with associated images and border painters.
    // TODO(msw): Add Menu, ComboBox, etc.
    enum ButtonStyle {
      STYLE_BUTTON = 0,
      STYLE_TEXTBUTTON,
      STYLE_COUNT,
    };
  
    static ButtonState GetButtonStateFrom(ui::NativeTheme::State state);
  
    void SetTooltipText(const base::string16& tooltip_text);
  
    int tag() const { return tag_; }
    void set_tag(int tag) { tag_ = tag; }
  
    void SetAccessibleName(const base::string16& name);
  
    // Overridden from View:
    bool GetTooltipText(const gfx::Point& p,
                        base::string16* tooltip) const override;
    void GetAccessibleState(ui::AXViewState* state) override;
  
   protected:
    // Construct the Button with a Listener. The listener can be NULL. This can be
    // true of buttons that don't have a listener - e.g. menubuttons where there's
    // no default action and checkboxes.
    explicit Button(ButtonListener* listener);
  
    // Cause the button to notify the listener that a click occurred.
    virtual void NotifyClick(const ui::Event& event);
  
    // Called when a button gets released without triggering an action.
    // Note: This is only wired up for mouse button events and not gesture
    // events.
    virtual void OnClickCanceled(const ui::Event& event);
  
    // The button's listener. Notified when clicked.
    ButtonListener* listener_;
  
   private:
    // The text shown in a tooltip.
    base::string16 tooltip_text_;
  
    // Accessibility data.
    base::string16 accessible_name_;
  
    // The id tag associated with this button. Used to disambiguate buttons in
    // the ButtonListener implementation.
    int tag_;
  
    DISALLOW_COPY_AND_ASSIGN(Button);
  };
  
  }  // namespace views
  
  #endif  // UI_VIEWS_CONTROLS_BUTTON_BUTTON_H_
  