gecko-dev/dom/ipc/CoalescedMouseData.h

/* -*- 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_CoalescedMouseData_h
#define mozilla_dom_CoalescedMouseData_h

#include "CoalescedInputData.h"
#include "mozilla/MouseEvents.h"
#include "nsRefreshDriver.h"

namespace mozilla {
namespace dom {

class CoalescedMouseData final : public CoalescedInputData<WidgetMouseEvent> {
 public:
  CoalescedMouseData() { MOZ_COUNT_CTOR(mozilla::dom::CoalescedMouseData); }

  ~CoalescedMouseData() { MOZ_COUNT_DTOR(mozilla::dom::CoalescedMouseData); }

  void Coalesce(const WidgetMouseEvent& aEvent,
                const ScrollableLayerGuid& aGuid,
                const uint64_t& aInputBlockId);

  bool CanCoalesce(const WidgetMouseEvent& aEvent,
                   const ScrollableLayerGuid& aGuid,
                   const uint64_t& aInputBlockId);
};

class CoalescedMouseMoveFlusher final : public nsARefreshObserver {
 public:
  explicit CoalescedMouseMoveFlusher(BrowserChild* aBrowserChild)
      : mBrowserChild(aBrowserChild) {
    MOZ_ASSERT(mBrowserChild);
  }

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

  NS_INLINE_DECL_REFCOUNTING(CoalescedMouseMoveFlusher, override)

  void StartObserver();
  void RemoveObserver();

 private:
  ~CoalescedMouseMoveFlusher() { RemoveObserver(); }

  nsRefreshDriver* GetRefreshDriver();

  BrowserChild* mBrowserChild;
  RefPtr<nsRefreshDriver> mRefreshDriver;
};

}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_CoalescedMouseData_h