зеркало из https://github.com/mozilla/gecko-dev.git
136 строки
4.7 KiB
C++
136 строки
4.7 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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/* base class for nsCounterList and nsQuoteList */
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#ifndef nsGenConList_h___
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#define nsGenConList_h___
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#include "mozilla/LinkedList.h"
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#include "nsIFrame.h"
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#include "nsStyleStruct.h"
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#include "nsCSSPseudoElements.h"
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#include "nsTextNode.h"
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class nsGenConList;
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struct nsGenConNode : public mozilla::LinkedListElement<nsGenConNode> {
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using StyleContentType = mozilla::StyleContentType;
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// The wrapper frame for all of the pseudo-element's content. This
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// frame generally has useful style data and has the
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// NS_FRAME_GENERATED_CONTENT bit set (so we use it to track removal),
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// but does not necessarily for |nsCounterChangeNode|s.
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nsIFrame* mPseudoFrame;
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// Index within the list of things specified by the 'content' property,
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// which is needed to do 'content: open-quote open-quote' correctly,
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// and needed for similar cases for counters.
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const int32_t mContentIndex;
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// null for 'content:no-open-quote', 'content:no-close-quote' and for
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// counter nodes for increments and resets (rather than uses)
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RefPtr<nsTextNode> mText;
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explicit nsGenConNode(int32_t aContentIndex)
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: mPseudoFrame(nullptr), mContentIndex(aContentIndex) {}
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/**
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* Finish initializing the generated content node once we know the
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* relevant text frame. This must be called just after
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* the textframe has been initialized. This need not be called at all
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* for nodes that don't generate text. This will generally set the
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* mPseudoFrame, insert the node into aList, and set aTextFrame up
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* with the correct text.
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* @param aList the list the node belongs to
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* @param aPseudoFrame the :before or :after frame
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* @param aTextFrame the textframe where the node contents will render
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* @return true iff this marked the list dirty
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*/
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virtual bool InitTextFrame(nsGenConList* aList, nsIFrame* aPseudoFrame,
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nsIFrame* aTextFrame) {
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mPseudoFrame = aPseudoFrame;
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CheckFrameAssertions();
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return false;
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}
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virtual ~nsGenConNode() {} // XXX Avoid, perhaps?
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protected:
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void CheckFrameAssertions() {
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NS_ASSERTION(
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mContentIndex < int32_t(mPseudoFrame->StyleContent()->ContentCount()),
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"index out of range");
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// We allow negative values of mContentIndex for 'counter-reset' and
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// 'counter-increment'.
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NS_ASSERTION(mContentIndex < 0 ||
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mPseudoFrame->Style()->GetPseudoType() ==
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mozilla::PseudoStyleType::before ||
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mPseudoFrame->Style()->GetPseudoType() ==
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mozilla::PseudoStyleType::after ||
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mPseudoFrame->Style()->GetPseudoType() ==
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mozilla::PseudoStyleType::marker,
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"not CSS generated content and not counter change");
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NS_ASSERTION(mContentIndex < 0 ||
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mPseudoFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT,
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"not generated content and not counter change");
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}
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};
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class nsGenConList {
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protected:
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mozilla::LinkedList<nsGenConNode> mList;
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uint32_t mSize;
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public:
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nsGenConList() : mSize(0), mLastInserted(nullptr) {}
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~nsGenConList() { Clear(); }
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void Clear();
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static nsGenConNode* Next(nsGenConNode* aNode) {
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MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
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return aNode->getNext();
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}
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static nsGenConNode* Prev(nsGenConNode* aNode) {
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MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
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return aNode->getPrevious();
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}
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void Insert(nsGenConNode* aNode);
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// Destroy all nodes with aFrame as parent. Returns true if some nodes
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// have been destroyed; otherwise false.
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bool DestroyNodesFor(nsIFrame* aFrame);
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// Return true if |aNode1| is after |aNode2|.
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static bool NodeAfter(const nsGenConNode* aNode1, const nsGenConNode* aNode2);
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bool IsFirst(nsGenConNode* aNode) {
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MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
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return aNode == mList.getFirst();
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}
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bool IsLast(nsGenConNode* aNode) {
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MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
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return aNode == mList.getLast();
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}
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private:
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void Destroy(nsGenConNode* aNode) {
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MOZ_ASSERT(aNode, "aNode cannot be nullptr!");
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delete aNode;
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mSize--;
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}
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// Map from frame to the first nsGenConNode of it in the list.
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nsDataHashtable<nsPtrHashKey<nsIFrame>, nsGenConNode*> mNodes;
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// A weak pointer to the node most recently inserted, used to avoid repeated
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// list traversals in Insert().
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nsGenConNode* mLastInserted;
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};
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#endif /* nsGenConList_h___ */
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