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// Copyright 2016 The Chromium Authors
// 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() = default;
};
} // namespace exo
#endif // COMPONENTS_EXO_TOUCH_STYLUS_DELEGATE_H_
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