layout/style/MediaFeatureChange.h
author Nika Layzell <nika@thelayzells.com>
Tue, 25 Sep 2018 17:34:53 +0200
changeset 507828 5e6dae0c1e5a4939ccd406f14607f7fafffd45a7
parent 457740 12ca97022384d5461f597088f6941c85c213197d
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1448426 - Wrap windows.h to avoid problematic define statements, r=froydnj,glandium By default, windows.h exposes a large number of problematic define statements which are UpperCamelCase, such as a define from `CreateWindow` to `CreateWindow{A,W}`. As many of these names are generic (e.g. CreateFile, CreateWindow), they can mess up Gecko code that may legitimately have its own methods with the same names. The header also defines some traditional SCREAMING_SNAKE_CASE defines which can mess up our code by conflicting with local values. This patch adds a simple code generator which generates wrappers for these defines, and uses them to wrap the windows.h wrapper using the `stl_wrappers` mechanism, allowing us to use windows.h in more places. Differential Revision: https://phabricator.services.mozilla.com/D10932

/* -*- 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/. */

/* A struct defining a media feature change. */

#ifndef mozilla_MediaFeatureChange_h__
#define mozilla_MediaFeatureChange_h__

#include "nsChangeHint.h"
#include "mozilla/Attributes.h"
#include "mozilla/TypedEnumBits.h"

namespace mozilla {

enum class MediaFeatureChangeReason
{
  // The viewport size the document has used has changed.
  //
  // This affects size media queries like min-width.
  ViewportChange = 1 << 0,
  // The effective text zoom has changed. This affects the meaning of em units,
  // and thus affects any media query that uses a Length.
  ZoomChange = 1 << 1,
  // The base min font size has changed. This can affect the meaning of em
  // units, if the previous default font-size has changed, and also zoom.
  MinFontSizeChange = 1 << 2,
  // The resolution has changed. This can affect device-pixel-ratio media
  // queries, for example.
  ResolutionChange = 1 << 3,
  // The medium has changed.
  MediumChange = 1 << 4,
  // The size-mode has changed.
  SizeModeChange = 1 << 5,
  // A system metric or multiple have changed. This affects all the media
  // features that expose the presence of a system metric directly.
  SystemMetricsChange = 1 << 6,
  // The fact of whether the device size is the page size has changed, thus
  // resolution media queries can change.
  DeviceSizeIsPageSizeChange = 1 << 7,
  // display-mode changed on the document, thus the display-mode media queries
  // may have changed.
  DisplayModeChange = 1 << 8,
};

MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(MediaFeatureChangeReason)

struct MediaFeatureChange
{
  nsRestyleHint mRestyleHint;
  nsChangeHint mChangeHint;
  MediaFeatureChangeReason mReason;

  MOZ_IMPLICIT MediaFeatureChange(MediaFeatureChangeReason aReason)
    : MediaFeatureChange(nsRestyleHint(0), nsChangeHint(0), aReason)
  {
  }

  MediaFeatureChange(nsRestyleHint aRestyleHint,
                     nsChangeHint aChangeHint,
                     MediaFeatureChangeReason aReason)
    : mRestyleHint(aRestyleHint)
    , mChangeHint(aChangeHint)
    , mReason(aReason)
  {
  }

  inline MediaFeatureChange& operator|=(const MediaFeatureChange& aOther)
  {
    mRestyleHint |= aOther.mRestyleHint;
    mChangeHint |= aOther.mChangeHint;
    mReason |= aOther.mReason;
    return *this;
  }
};

} // namespace mozilla

#endif