// 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_