exo: Replace pointer based stylus and replace with touch based stylus

components/exo/touch_stylus_delegate.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 COMPONENTS_EXO_TOUCH_STYLUS_DELEGATE_H_
+#define COMPONENTS_EXO_TOUCH_STYLUS_DELEGATE_H_
+
+#include "base/time/time.h"
+#include "ui/events/event_constants.h"
+
+namespace gfx {
+class Vector2dF;
+}
+
+namespace exo {
+class Touch;
+
+// Handles stylus specific events as an extension to TouchDelegate.
+class TouchStylusDelegate {
+ public:
+  // Called at the top of the touch's destructor, to give observers a
+  // chance to remove themselves.
+  virtual void OnTouchDestroying(Touch* pointer) = 0;
+
+  // Called to set the tool type of a touch. Only called once with the down
+  // event. A tool type cannot change afterwards.
+  virtual void OnTouchTool(int touch_id, ui::EventPointerType type) = 0;
+
+  // Called when the force (pressure) of the touch changes.
+  // Normalized to be [0, 1].
+  virtual void OnTouchForce(base::TimeTicks time_stamp,
+                            int touch_id,
+                            float force) = 0;
+
+  // Called when the tilt of a pen/stylus changes. Measured from surface normal
+  // as plane angle in degrees, values lie in [-90,90]. A positive x is to the
+  // right and a positive y is towards the user.
+  virtual void OnTouchTilt(base::TimeTicks time_stamp,
+                           int touch_id,
+                           const gfx::Vector2dF& tilt) = 0;
+
+ protected:
+  virtual ~TouchStylusDelegate() {}
+};
+
+}  // namespace exo
+
+#endif  // COMPONENTS_EXO_TOUCH_STYLUS_DELEGATE_H_