// 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_POINTER_STYLUS_DELEGATE_H_ #define COMPONENTS_EXO_POINTER_STYLUS_DELEGATE_H_ #include "base/time/time.h" #include "ui/events/event_constants.h" namespace gfx { class Vector2dF; } namespace exo { class Pointer; // Handles tool-specific event details on pointers. Used as an extension to the // PointerDelegate. class PointerStylusDelegate { public: // Called at the top of the pointer's destructor, to give observers a // chance to remove themselves. virtual void OnPointerDestroying(Pointer* pointer) = 0; // Called when the type of pointer device changes. virtual void OnPointerToolChange(ui::EventPointerType type) = 0; // Called when the force (pressure) of the pointer changes. // Normalized to be [0, 1]. NaN means pressure is not supported by the // input device. virtual void OnPointerForce(base::TimeTicks time_stamp, 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. Always 0 if the device does // not support it. virtual void OnPointerTilt(base::TimeTicks time_stamp, const gfx::Vector2dF& tilt) = 0; protected: virtual ~PointerStylusDelegate() {} }; } // namespace exo #endif // COMPONENTS_EXO_POINTER_STYLUS_DELEGATE_H_