chromium/ui/views/controls/button/checkbox.h


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// 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_BUTTON_CHECKBOX_H_
#define UI_VIEWS_CONTROLS_BUTTON_CHECKBOX_H_

#include <string>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/strings/string16.h"
#include "cc/paint/paint_flags.h"
#include "ui/views/controls/button/label_button.h"

namespace gfx {
struct VectorIcon;
}

namespace views {

// A native themed class representing a checkbox.  This class does not use
// platform specific objects to replicate the native platforms looks and feel.
class VIEWS_EXPORT Checkbox : public LabelButton {
 public:
  static const char kViewClassName[];

  // |force_md| forces MD even when --secondary-ui-md flag is not set.
  explicit Checkbox(const base::string16& label, bool force_md = false);
  ~Checkbox() override;

  // Sets a listener for this checkbox. Checkboxes aren't required to have them
  // since their state can be read independently of them being toggled.
  void set_listener(ButtonListener* listener) { listener_ = listener; }

  // Sets/Gets whether or not the checkbox is checked.
  virtual void SetChecked(bool checked);
  bool checked() const { return checked_; }

  void SetMultiLine(bool multi_line);

 protected:
  // Returns whether MD is enabled. Returns true if |force_md| in the
  // constructor or --secondary-ui-md flag is set.
  bool UseMd() const;

  // LabelButton:
  const char* GetClassName() const override;
  void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
  void OnFocus() override;
  void OnBlur() override;
  void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
  std::unique_ptr<InkDrop> CreateInkDrop() override;
  std::unique_ptr<InkDropRipple> CreateInkDropRipple() const override;
  SkColor GetInkDropBaseColor() const override;
  gfx::ImageSkia GetImage(ButtonState for_state) const override;
  std::unique_ptr<LabelButtonBorder> CreateDefaultBorder() const override;

  // Set the image shown for each button state depending on whether it is
  // [checked] or [focused].
  void SetCustomImage(bool checked,
                      bool focused,
                      ButtonState for_state,
                      const gfx::ImageSkia& image);

  // Paints a focus indicator for the view. Overridden in RadioButton.
  virtual void PaintFocusRing(View* view,
                              gfx::Canvas* canvas,
                              const cc::PaintFlags& flags);

  // Gets the vector icon to use based on the current state of |checked_|.
  virtual const gfx::VectorIcon& GetVectorIcon() const;

 private:
  friend class IconFocusRing;

  // Bitmask constants for GetIconImageColor.
  enum IconState { CHECKED = 0b1, ENABLED = 0b10 };

  // |icon_state| is a bitmask using the IconState enum.
  SkColor GetIconImageColor(int icon_state) const;

  // Button:
  void NotifyClick(const ui::Event& event) override;

  ui::NativeTheme::Part GetThemePart() const override;
  void GetExtraParams(ui::NativeTheme::ExtraParams* params) const override;

  // True if the checkbox is checked.
  bool checked_;

  // FocusRing used in MD mode
  View* focus_ring_ = nullptr;

  // The images for each button node_data.
  gfx::ImageSkia images_[2][2][STATE_COUNT];

  bool use_md_;

  DISALLOW_COPY_AND_ASSIGN(Checkbox);
};

}  // namespace views

#endif  // UI_VIEWS_CONTROLS_BUTTON_CHECKBOX_H_