cef/libcef/browser/osr/motion_event_osr.h

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// Copyright (c) 2017 The Chromium Embedded Framework Authors.
// Portions copyright (c) 2012 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 CEF_LIBCEF_BROWSER_OSR_MOTION_EVENT_OSR_H_
#define CEF_LIBCEF_BROWSER_OSR_MOTION_EVENT_OSR_H_
#pragma once
#include "include/cef_base.h"
#include "third_party/blink/public/common/input/web_touch_event.h"
#include "ui/events/gesture_detection/motion_event_generic.h"
// Implementation of MotionEvent which takes a stream of CefTouchEvents.
// This class is based on ui::MotionEventAura.
class CefMotionEventOSR : public ui::MotionEventGeneric {
public:
CefMotionEventOSR();
CefMotionEventOSR(const CefMotionEventOSR&) = delete;
CefMotionEventOSR& operator=(const CefMotionEventOSR&) = delete;
~CefMotionEventOSR() override;
int GetSourceDeviceId(size_t pointer_index) const override;
// Returns true if the touch was valid.
bool OnTouch(const CefTouchEvent& touch);
// We can't cleanup removed touch points immediately upon receipt of a
// TouchCancel or TouchRelease, as the MotionEvent needs to be able to report
// information about those touch events. Once the MotionEvent has been
// processed, we call CleanupRemovedTouchPoints to do the required
// book-keeping.
void CleanupRemovedTouchPoints(const CefTouchEvent& event);
// Reset unchanged touch point to StateStationary for touchmove and
// touchcancel to make sure only send one ack per WebTouchEvent.
void MarkUnchangedTouchPointsAsStationary(blink::WebTouchEvent* event,
const CefTouchEvent& cef_event);
private:
// Chromium can't cope with touch ids >31, so let's map the incoming
// ids to a safe range.
int id_map_[blink::WebTouchEvent::kTouchesLengthCap];
int LookupId(int id);
int AddId(int id);
void RemoveId(int id);
bool AddTouch(const CefTouchEvent& touch, int id);
void UpdateTouch(const CefTouchEvent& touch, int id);
void UpdateCachedAction(const CefTouchEvent& touch, int id);
bool IsValidIndex(int index) const;
ui::PointerProperties GetPointerPropertiesFromTouchEvent(
const CefTouchEvent& touch,
int id);
};
#endif