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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /layout/style/ServoElementSnapshot.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'layout/style/ServoElementSnapshot.h')
-rw-r--r--layout/style/ServoElementSnapshot.h169
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diff --git a/layout/style/ServoElementSnapshot.h b/layout/style/ServoElementSnapshot.h
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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
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_ServoElementSnapshot_h
+#define mozilla_ServoElementSnapshot_h
+
+#include "mozilla/EventStates.h"
+#include "mozilla/TypedEnumBits.h"
+#include "mozilla/dom/BorrowedAttrInfo.h"
+#include "nsAttrName.h"
+#include "nsAttrValue.h"
+#include "nsChangeHint.h"
+#include "nsIAtom.h"
+
+namespace mozilla {
+
+namespace dom {
+class Element;
+} // namespace dom
+
+/**
+ * A structure representing a single attribute name and value.
+ *
+ * This is pretty similar to the private nsAttrAndChildArray::InternalAttr.
+ */
+struct ServoAttrSnapshot
+{
+ nsAttrName mName;
+ nsAttrValue mValue;
+
+ ServoAttrSnapshot(const nsAttrName& aName, const nsAttrValue& aValue)
+ : mName(aName)
+ , mValue(aValue)
+ {
+ }
+};
+
+/**
+ * A bitflags enum class used to determine what data does a ServoElementSnapshot
+ * contains.
+ */
+enum class ServoElementSnapshotFlags : uint8_t
+{
+ State = 1 << 0,
+ Attributes = 1 << 1,
+ All = State | Attributes
+};
+
+MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ServoElementSnapshotFlags)
+
+/**
+ * This class holds all non-tree-structural state of an element that might be
+ * used for selector matching eventually.
+ *
+ * This means the attributes, and the element state, such as :hover, :active,
+ * etc...
+ */
+class ServoElementSnapshot
+{
+ typedef dom::BorrowedAttrInfo BorrowedAttrInfo;
+ typedef dom::Element Element;
+ typedef EventStates::ServoType ServoStateType;
+
+public:
+ typedef ServoElementSnapshotFlags Flags;
+
+ explicit ServoElementSnapshot(Element* aElement);
+
+ bool HasAttrs() { return HasAny(Flags::Attributes); }
+
+ bool HasState() { return HasAny(Flags::State); }
+
+ /**
+ * Captures the given state (if not previously captured).
+ */
+ void AddState(EventStates aState)
+ {
+ if (!HasAny(Flags::State)) {
+ mState = aState.ServoValue();
+ mContains |= Flags::State;
+ }
+ }
+
+ /**
+ * Captures the given element attributes (if not previously captured).
+ */
+ void AddAttrs(Element* aElement);
+
+ void AddExplicitChangeHint(nsChangeHint aMinChangeHint)
+ {
+ mExplicitChangeHint |= aMinChangeHint;
+ }
+
+ void AddExplicitRestyleHint(nsRestyleHint aRestyleHint)
+ {
+ mExplicitRestyleHint |= aRestyleHint;
+ }
+
+ nsRestyleHint ExplicitRestyleHint() { return mExplicitRestyleHint; }
+
+ nsChangeHint ExplicitChangeHint() { return mExplicitChangeHint; }
+
+ /**
+ * Needed methods for attribute matching.
+ */
+ BorrowedAttrInfo GetAttrInfoAt(uint32_t aIndex) const
+ {
+ if (aIndex >= mAttrs.Length()) {
+ return BorrowedAttrInfo(nullptr, nullptr);
+ }
+ return BorrowedAttrInfo(&mAttrs[aIndex].mName, &mAttrs[aIndex].mValue);
+ }
+
+ const nsAttrValue* GetParsedAttr(nsIAtom* aLocalName) const
+ {
+ return GetParsedAttr(aLocalName, kNameSpaceID_None);
+ }
+
+ const nsAttrValue* GetParsedAttr(nsIAtom* aLocalName,
+ int32_t aNamespaceID) const
+ {
+ uint32_t i, len = mAttrs.Length();
+ if (aNamespaceID == kNameSpaceID_None) {
+ // This should be the common case so lets make an optimized loop
+ for (i = 0; i < len; ++i) {
+ if (mAttrs[i].mName.Equals(aLocalName)) {
+ return &mAttrs[i].mValue;
+ }
+ }
+
+ return nullptr;
+ }
+
+ for (i = 0; i < len; ++i) {
+ if (mAttrs[i].mName.Equals(aLocalName, aNamespaceID)) {
+ return &mAttrs[i].mValue;
+ }
+ }
+
+ return nullptr;
+ }
+
+ bool IsInChromeDocument() const
+ {
+ return mIsInChromeDocument;
+ }
+
+ bool HasAny(Flags aFlags) { return bool(mContains & aFlags); }
+
+private:
+ // TODO: Profile, a 1 or 2 element AutoTArray could be worth it, given we know
+ // we're dealing with attribute changes when we take snapshots of attributes,
+ // though it can be wasted space if we deal with a lot of state-only
+ // snapshots.
+ Flags mContains;
+ nsTArray<ServoAttrSnapshot> mAttrs;
+ ServoStateType mState;
+ nsRestyleHint mExplicitRestyleHint;
+ nsChangeHint mExplicitChangeHint;
+ bool mIsHTMLElementInHTMLDocument;
+ bool mIsInChromeDocument;
+};
+
+} // namespace mozilla
+
+#endif