зеркало из https://github.com/mozilla/gecko-dev.git
82 строки
2.6 KiB
C++
82 строки
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* A struct defining a media feature change. */
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#ifndef mozilla_MediaFeatureChange_h__
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#define mozilla_MediaFeatureChange_h__
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#include "nsChangeHint.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/TypedEnumBits.h"
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namespace mozilla {
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enum class MediaFeatureChangeReason
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{
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// The viewport size the document has used has changed.
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//
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// This affects size media queries like min-width.
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ViewportChange = 1 << 0,
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// The effective text zoom has changed. This affects the meaning of em units,
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// and thus affects any media query that uses a Length.
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ZoomChange = 1 << 1,
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// The base min font size has changed. This can affect the meaning of em
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// units, if the previous default font-size has changed, and also zoom.
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MinFontSizeChange = 1 << 2,
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// The resolution has changed. This can affect device-pixel-ratio media
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// queries, for example.
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ResolutionChange = 1 << 3,
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// The medium has changed.
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MediumChange = 1 << 4,
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// The size-mode has changed.
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SizeModeChange = 1 << 5,
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// A system metric or multiple have changed. This affects all the media
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// features that expose the presence of a system metric directly.
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SystemMetricsChange = 1 << 6,
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// The fact of whether the device size is the page size has changed, thus
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// resolution media queries can change.
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DeviceSizeIsPageSizeChange = 1 << 7,
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// display-mode changed on the document, thus the display-mode media queries
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// may have changed.
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DisplayModeChange = 1 << 8,
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};
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MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(MediaFeatureChangeReason)
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struct MediaFeatureChange
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{
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nsRestyleHint mRestyleHint;
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nsChangeHint mChangeHint;
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MediaFeatureChangeReason mReason;
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MOZ_IMPLICIT MediaFeatureChange(MediaFeatureChangeReason aReason)
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: MediaFeatureChange(nsRestyleHint(0), nsChangeHint(0), aReason)
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{
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}
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MediaFeatureChange(nsRestyleHint aRestyleHint,
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nsChangeHint aChangeHint,
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MediaFeatureChangeReason aReason)
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: mRestyleHint(aRestyleHint)
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, mChangeHint(aChangeHint)
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, mReason(aReason)
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{
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}
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inline MediaFeatureChange& operator|=(const MediaFeatureChange& aOther)
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{
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mRestyleHint |= aOther.mRestyleHint;
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mChangeHint |= aOther.mChangeHint;
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mReason |= aOther.mReason;
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return *this;
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}
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};
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} // namespace mozilla
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#endif
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