ash: Refactor autoclick common code to ash/autoclick/common.

ash/autoclick/common/autoclick_controller_common.h

+// Copyright 2016 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_AUTOCLICK_COMMON_AUTOCLICK_CONTROLLER_COMMON_H
+#define ASH_AUTOCLICK_COMMON_AUTOCLICK_CONTROLLER_COMMON_H
+
+#include "ash/autoclick/common/autoclick_ring_handler.h"
+#include "base/macros.h"
+#include "base/timer/timer.h"
+#include "ui/events/keycodes/keyboard_codes.h"
+#include "ui/gfx/geometry/point.h"
+
+namespace views {
+class Widget;
+}
+
+namespace ui {
+class MouseEvent;
+class KeyEvent;
+class TouchEvent;
+class GestureEvent;
+class ScrollEvent;
+}
+
+namespace ash {
+
+// Autoclick controller common code for ash and mus.

[sky, 2016/08/15 19:27:00]

Please update this code to better document what autoclick is, and what this code
does.

[riajiang, 2016/08/16 00:44:24]

Done.

+class AutoclickControllerCommon {
+ public:
+  class Delegate {

[sky, 2016/08/15 19:27:00]

It's preferable to put delegates/observers into their own header files to
minimize import. See chromium style guide for more details.

[riajiang, 2016/08/16 00:44:24]

Done.

+   public:
+    Delegate() {}
+    virtual ~Delegate() {}
+
+    // Creates a ring widget at |event_location|. AutoclickControllerCommon
+    // takes ownership of the created widget.
+    virtual std::unique_ptr<views::Widget> CreateAutoclickRingWidget(
+        const gfx::Point& event_location) = 0;
+
+    // Moves |widget| to |event_location|.
+    virtual void UpdateAutoclickRingWidget(
+        views::Widget* widget,
+        const gfx::Point& event_location) = 0;
+
+    // Generates a click with |mouse_event_flags| at |event_location|.
+    virtual void DoAutoclick(const gfx::Point& event_location,
+                             const int mouse_event_flags) = 0;
+
+    virtual void OnAutoclickCanceled() = 0;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Delegate);
+  };
+
+  AutoclickControllerCommon(base::TimeDelta delay, Delegate* delegate);
+  ~AutoclickControllerCommon();
+
+  void HandleMouseEvent(const ui::MouseEvent& event);
+  void HandleKeyEvent(const ui::KeyEvent& event);
+  void HandleTouchEvent(const ui::TouchEvent& event);

[sky, 2016/08/15 19:27:00]

Can touch/gesture/scroll be removed and instead call cancel?

[riajiang, 2016/08/16 00:44:24]

Done.

+  void HandleGestureEvent(const ui::GestureEvent& event);
+  void HandleScrollEvent(const ui::ScrollEvent& event);
+
+  void SetAutoclickDelay(const base::TimeDelta delay);
+  void CancelAutoclick();
+
+ private:
+  void InitClickTimer();
+
+  void DoAutoclick();
+
+  void UpdateRingWidget(const gfx::Point& mouse_location);
+
+  base::TimeDelta delay_;
+  int mouse_event_flags_;
+  std::unique_ptr<base::Timer> autoclick_timer_;
+  Delegate* delegate_;
+  std::unique_ptr<views::Widget> widget_;
+  // The position in screen coordinates used to determine
+  // the distance the mouse has moved.
+  gfx::Point anchor_location_;
+  std::unique_ptr<AutoclickRingHandler> autoclick_ring_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(AutoclickControllerCommon);
+};
+
+}  // namespace ash
+
+#endif  // ASH_AUTOCLICK_COMMON_AUTOCLICK_CONTROLLER_COMMON_H