CoalescedInputData.h

Enable keyboard shortcuts

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_CoalescedInputData_h

#define mozilla_dom_CoalescedInputData_h

#include "mozilla/UniquePtr.h"

#include "mozilla/layers/ScrollableLayerGuid.h"

#include "nsRefreshObservers.h"

class nsRefreshDriver;

namespace mozilla::dom {

class BrowserChild;

template <class InputEventType>

class CoalescedInputData {

 protected:

  using ScrollableLayerGuid = mozilla::layers::ScrollableLayerGuid;

  UniquePtr<InputEventType> mCoalescedInputEvent;

  ScrollableLayerGuid mGuid;

  uint64_t mInputBlockId;

 public:

  CoalescedInputData() : mInputBlockId(0) {}

  void RetrieveDataFrom(CoalescedInputData& aSource) {

    mCoalescedInputEvent = std::move(aSource.mCoalescedInputEvent);

    mGuid = aSource.mGuid;

    mInputBlockId = aSource.mInputBlockId;

  bool IsEmpty() { return !mCoalescedInputEvent; }

  bool CanCoalesce(const InputEventType& aEvent,

                   const ScrollableLayerGuid& aGuid,

                   const uint64_t& aInputBlockId);

  UniquePtr<InputEventType> TakeCoalescedEvent() {

    return std::move(mCoalescedInputEvent);

  ScrollableLayerGuid GetScrollableLayerGuid() { return mGuid; }

  uint64_t GetInputBlockId() { return mInputBlockId; }

};

class CoalescedInputFlusher : public nsARefreshObserver {

 public:

  explicit CoalescedInputFlusher(BrowserChild* aBrowserChild);

  virtual void WillRefresh(mozilla::TimeStamp aTime) override = 0;

  NS_INLINE_DECL_REFCOUNTING(CoalescedInputFlusher, override)

  void StartObserver();

  void RemoveObserver();

 protected:

  virtual ~CoalescedInputFlusher();

  nsRefreshDriver* GetRefreshDriver();

  BrowserChild* mBrowserChild;

  RefPtr<nsRefreshDriver> mRefreshDriver;

};

}  // namespace mozilla::dom

#endif  // mozilla_dom_CoalescedInputData_h