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afd9c3eee4
This comes from bug 890195, and it was superseded by bug 1575097. This isn't used for anything anymore, and we can remove the otherwise unused MediaFeatureChangeReason flag as well. Differential Revision: https://phabricator.services.mozilla.com/D174492
92 lines
3.1 KiB
C++
92 lines
3.1 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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#include "mozilla/ServoStyleConsts.h"
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namespace mozilla {
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enum class MediaFeatureChangeReason : uint8_t {
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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 resolution has changed. This can affect device-pixel-ratio media
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// queries, for example.
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ResolutionChange = 1 << 2,
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// The medium has changed.
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MediumChange = 1 << 3,
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// The size-mode has changed.
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SizeModeChange = 1 << 4,
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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 << 5,
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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 << 6,
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// A preference that affects media query results has changed. For
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// example, changes to document_color_use will affect
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// prefers-contrast.
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PreferenceChange = 1 << 7,
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};
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MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(MediaFeatureChangeReason)
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enum class MediaFeatureChangePropagation : uint8_t {
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JustThisDocument = 0,
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SubDocuments = 1 << 0,
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Images = 1 << 1,
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All = Images | SubDocuments,
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};
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MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(MediaFeatureChangePropagation)
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struct MediaFeatureChange {
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static const auto kAllChanges = static_cast<MediaFeatureChangeReason>(~0);
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RestyleHint 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(RestyleHint{0}, nsChangeHint(0), aReason) {}
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MediaFeatureChange(RestyleHint aRestyleHint, 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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inline MediaFeatureChange& operator|=(const MediaFeatureChange& aOther) {
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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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static MediaFeatureChange ForPreferredColorSchemeChange() {
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// We need to restyle because not only media queries have changed, system
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// colors may as well via the prefers-color-scheme meta tag / effective
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// color-scheme property value.
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return {RestyleHint::RecascadeSubtree(), nsChangeHint(0),
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MediaFeatureChangeReason::SystemMetricsChange};
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}
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};
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} // namespace mozilla
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#endif
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