ash/shelf/app_list_button.h

// Copyright 2014 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 ASH_SHELF_APP_LIST_BUTTON_H_
#define ASH_SHELF_APP_LIST_BUTTON_H_

#include <memory>

#include "ash/ash_export.h"
#include "base/macros.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/views/controls/button/image_button.h"

namespace ash {
class InkDropButtonListener;
class ShelfView;
class WmShelf;

// Button used for the AppList icon on the shelf.
class ASH_EXPORT AppListButton : public views::ImageButton {
 public:
  AppListButton(InkDropButtonListener* listener,
                ShelfView* shelf_view,
                WmShelf* wm_shelf);
  ~AppListButton() override;

  void OnAppListShown();
  void OnAppListDismissed();

  bool is_showing_app_list() const { return is_showing_app_list_; }

  // Updates background and schedules a paint.
  void UpdateShelfItemBackground(SkColor color);

  // views::ImageButton overrides:
  void OnGestureEvent(ui::GestureEvent* event) override;

 protected:
  // views::ImageButton overrides:
  bool OnMousePressed(const ui::MouseEvent& event) override;
  void OnMouseReleased(const ui::MouseEvent& event) override;
  void OnMouseCaptureLost() override;
  bool OnMouseDragged(const ui::MouseEvent& event) override;
  void OnPaint(gfx::Canvas* canvas) override;
  void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
  std::unique_ptr<views::InkDropRipple> CreateInkDropRipple() const override;
  void NotifyClick(const ui::Event& event) override;
  bool ShouldEnterPushedState(const ui::Event& event) override;
  std::unique_ptr<views::InkDrop> CreateInkDrop() override;
  std::unique_ptr<views::InkDropMask> CreateInkDropMask() const override;

 private:
  // Get the center point of the app list button used to draw its background and
  // ink drops.
  gfx::Point GetCenterPoint() const;

  // True if the app list is currently showing for this display.
  // This is useful because other IsApplistVisible functions aren't per-display.
  bool is_showing_app_list_;

  // Color used to paint the background.
  SkColor background_color_;

  InkDropButtonListener* listener_;
  ShelfView* shelf_view_;
  WmShelf* wm_shelf_;

  DISALLOW_COPY_AND_ASSIGN(AppListButton);
};

}  // namespace ash

#endif  // ASH_SHELF_APP_LIST_BUTTON_H_