Show a visual indicator for the progress of auto-click.

ash/autoclick/autoclick_controller.h

 // Copyright 2013 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_AUTOCLICK_CONTROLLER_H
 #define ASH_AUTOCLICK_AUTOCLICK_CONTROLLER_H
 
+#include <memory>
+
 #include "ash/ash_export.h"
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "ui/gfx/geometry/point.h"
 
 namespace ash {
 
 // Controls the autoclick a11y feature in ash.
 // If enabled, we will automatically send a click event a short time after
 // the mouse had been at rest.
 class ASH_EXPORT AutoclickController {
  public:
+  class Delegate {
+   public:
+    Delegate() {}
+    virtual ~Delegate() {}
+
+    // Called when an autoclick gesture begins.
+    virtual void StartGesture(base::TimeDelta duration,
+                              const gfx::Point& center_point_in_screen) = 0;
+
+    // Called when the gesture has ended, either because the mouse moved or
+    // because the autoclick completed.
+    virtual void StopGesture() = 0;
+
+    // Called when the autoclick target has changed.
+    virtual void SetGestureCenter(const gfx::Point& center_point_in_screen) = 0;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Delegate);
+  };
+
   virtual ~AutoclickController() {}
 
+  // Set the delegate to work with.
+  virtual void SetDelegate(std::unique_ptr<Delegate> delegate) = 0;
+
   // Set whether autoclicking is enabled.
   virtual void SetEnabled(bool enabled) = 0;
 
   // Returns true if autoclicking is enabled.
   virtual bool IsEnabled() const = 0;
 
   // Set the time to wait in milliseconds from when the mouse stops moving
   // to when the autoclick event is sent.
-  virtual void SetAutoclickDelay(int delay_ms) = 0;
+  virtual void SetAutoclickDelay(base::TimeDelta delay) = 0;
 
   // Returns the autoclick delay in milliseconds.
-  virtual int GetAutoclickDelay() const = 0;
+  virtual base::TimeDelta GetAutoclickDelay() const = 0;
 
   static AutoclickController* CreateInstance();
 
   // The default wait time between last mouse movement and sending
   // the autoclick.
   static const int kDefaultAutoclickDelayMs;
 
+  // Gets the default wait time as a base::TimeDelta object.
+  static base::TimeDelta GetDefaultAutoclickDelay();
+
  protected:
   AutoclickController() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_AUTOCLICK_AUTOCLICK_CONTROLLER_H