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/* -*- 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
/* 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"
#include "mozilla/ServoStyleConsts.h"
namespace mozilla {
enum class MediaFeatureChangeReason : uint8_t {
// 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 resolution has changed. This can affect device-pixel-ratio media
// queries, for example.
ResolutionChange = 1 << 2,
// The medium has changed.
MediumChange = 1 << 3,
// The size-mode has changed.
SizeModeChange = 1 << 4,
// A system metric or multiple have changed. This affects all the media
// features that expose the presence of a system metric directly.
SystemMetricsChange = 1 << 5,
// display-mode changed on the document, thus the display-mode media queries
// may have changed.
DisplayModeChange = 1 << 6,
// A preference that affects media query results has changed. For
// example, changes to document_color_use will affect
// prefers-contrast.
PreferenceChange = 1 << 7,
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(MediaFeatureChangeReason)
enum class MediaFeatureChangePropagation : uint8_t {
JustThisDocument = 0,
SubDocuments = 1 << 0,
Images = 1 << 1,
All = Images | SubDocuments,
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(MediaFeatureChangePropagation)
struct MediaFeatureChange {
static const auto kAllChanges = static_cast<MediaFeatureChangeReason>(~0);
RestyleHint mRestyleHint;
nsChangeHint mChangeHint;
MediaFeatureChangeReason mReason;
MOZ_IMPLICIT MediaFeatureChange(MediaFeatureChangeReason aReason)
: MediaFeatureChange(RestyleHint{0}, nsChangeHint(0), aReason) {}
MediaFeatureChange(RestyleHint 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;
}
static MediaFeatureChange ForPreferredColorSchemeChange() {
// We need to restyle because not only media queries have changed, system
// colors may as well via the prefers-color-scheme meta tag / effective
// color-scheme property value.
return {RestyleHint::RecascadeSubtree(), nsChangeHint(0),
MediaFeatureChangeReason::SystemMetricsChange};
}
};
} // namespace mozilla
#endif