dom/base/mozAutoDocUpdate.h
author Simon Whitehead <chemnova@gmail.com>
Sat, 13 May 2017 15:12:15 -0500
changeset 358329 633151f5d481d49bd39900d43e6a75d77459a7bb
parent 242147 bd079aadd3feeee3f9b9f73c5e0bc4bd6a870722
child 418394 e06da1f5c02ad9eb6e8c3ac1a04e3f8a5a72c05f
permissions -rw-r--r--
servo: Merge #16829 - Disallow negative duration for animation and transition (from hiikezoe:disallow-negative-duration); r=emilio <!-- Please describe your changes on the following line: --> --- <!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: --> - [X] `./mach build -d` does not report any errors - [X] `./mach test-tidy` does not report any errors - [X] These changes fix #15343 <!-- Either: --> - [X] There are tests for these changes written by @simon-whitehead . Thank you! <!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.--> <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> Source-Repo: https://github.com/servo/servo Source-Revision: 4613c0382ab76263fb8202ccf52f4c0520e44809

/* -*- 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 mozAutoDocUpdate_h_
#define mozAutoDocUpdate_h_

#include "nsContentUtils.h" // For AddScriptBlocker() and RemoveScriptBlocker().
#include "nsIDocument.h"
#include "nsIDocumentObserver.h"

/**
 * Helper class to automatically handle batching of document updates.  This
 * class will call BeginUpdate on construction and EndUpdate on destruction on
 * the given document with the given update type.  The document could be null,
 * in which case no updates will be called.  The constructor also takes a
 * boolean that can be set to false to prevent notifications.
 */
class MOZ_STACK_CLASS mozAutoDocUpdate
{
public:
  mozAutoDocUpdate(nsIDocument* aDocument, nsUpdateType aUpdateType,
                   bool aNotify) :
    mDocument(aNotify ? aDocument : nullptr),
    mUpdateType(aUpdateType)
  {
    if (mDocument) {
      mDocument->BeginUpdate(mUpdateType);
    }
    else {
      nsContentUtils::AddScriptBlocker();
    }
  }

  ~mozAutoDocUpdate()
  {
    if (mDocument) {
      mDocument->EndUpdate(mUpdateType);
    }
    else {
      nsContentUtils::RemoveScriptBlocker();
    }
  }

private:
  nsCOMPtr<nsIDocument> mDocument;
  nsUpdateType mUpdateType;
};

#define MOZ_AUTO_DOC_UPDATE_PASTE2(tok,line) tok##line
#define MOZ_AUTO_DOC_UPDATE_PASTE(tok,line) \
  MOZ_AUTO_DOC_UPDATE_PASTE2(tok,line)
#define MOZ_AUTO_DOC_UPDATE(doc,type,notify) \
  mozAutoDocUpdate MOZ_AUTO_DOC_UPDATE_PASTE(_autoDocUpdater_, __LINE__) \
  (doc,type,notify)


/**
 * Creates an update batch only under certain conditions.
 * Use this rather than mozAutoDocUpdate when you expect inner updates
 * to notify but you don't always want to spec cycles creating a batch.
 * This is needed to avoid having this batch always create a blocker,
 * but then have inner mozAutoDocUpdate call the last EndUpdate before.
 * we remove that blocker. See bug 423269.
 */
class MOZ_STACK_CLASS mozAutoDocConditionalContentUpdateBatch
{
public:
  mozAutoDocConditionalContentUpdateBatch(nsIDocument* aDocument,
                                          bool aNotify) :
    mDocument(aNotify ? aDocument : nullptr)
  {
    if (mDocument) {
      mDocument->BeginUpdate(UPDATE_CONTENT_MODEL);
    }
  }

  ~mozAutoDocConditionalContentUpdateBatch()
  {
    if (mDocument) {
      mDocument->EndUpdate(UPDATE_CONTENT_MODEL);
    }
  }

private:
  nsCOMPtr<nsIDocument> mDocument;
};

#endif