dom/ipc/CoalescedInputData.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "nsRefreshDriver.h"
   8 #include "BrowserChild.h"
   9 #include "CoalescedInputData.h"
  10 #include "mozilla/PresShell.h"
  11
  12 using namespace mozilla;
  13 using namespace mozilla::dom;
  14
  15 void CoalescedInputFlusher::StartObserver() {
  16   nsRefreshDriver* refreshDriver = GetRefreshDriver();
  17   if (mRefreshDriver && mRefreshDriver == refreshDriver) {
  18     // Nothing to do if we already added an observer and it's same refresh
  19     // driver.
  20     return;
  21   }
  22   RemoveObserver();
  23   if (refreshDriver) {
  24     mRefreshDriver = refreshDriver;
  25     mRefreshDriver->AddRefreshObserver(this, FlushType::Event,
  26                                        "Coalesced input move flusher");
  27   }
  28 }
  29
  30 CoalescedInputFlusher::CoalescedInputFlusher(BrowserChild* aBrowserChild)
  31     : mBrowserChild(aBrowserChild) {}
  32
  33 void CoalescedInputFlusher::RemoveObserver() {
  34   if (mRefreshDriver) {
  35     mRefreshDriver->RemoveRefreshObserver(this, FlushType::Event);
  36     mRefreshDriver = nullptr;
  37   }
  38 }
  39
  40 CoalescedInputFlusher::~CoalescedInputFlusher() = default;
  41
  42 nsRefreshDriver* CoalescedInputFlusher::GetRefreshDriver() {
  43   if (PresShell* presShell = mBrowserChild->GetTopLevelPresShell()) {
  44     return presShell->GetRefreshDriver();
  45   }
  46   return nullptr;
  47 }