forked from mirrors/gecko-dev
27b5f4f246
This has the side effect of firing the media query list change event for printing, but it also improves the print emulation on DevTools, which is an extra win! Differential Revision: https://phabricator.services.mozilla.com/D154906
94 lines
3.3 KiB
C++
94 lines
3.3 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 : uint16_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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// 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 << 6,
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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 << 7,
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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 << 8,
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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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