/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* 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/. */ /* base class for nsCounterList and nsQuoteList */ #ifndef nsGenConList_h___ #define nsGenConList_h___ #include "mozilla/LinkedList.h" #include "nsIFrame.h" #include "nsStyleStruct.h" #include "nsCSSPseudoElements.h" #include "nsTextNode.h" class nsGenConList; struct nsGenConNode : public mozilla::LinkedListElement<nsGenConNode> { // The wrapper frame for all of the pseudo-element's content. This // frame generally has useful style data and has the // NS_FRAME_GENERATED_CONTENT bit set (so we use it to track removal), // but does not necessarily for |nsCounterChangeNode|s. nsIFrame* mPseudoFrame; // Index within the list of things specified by the 'content' property, // which is needed to do 'content: open-quote open-quote' correctly, // and needed for similar cases for counters. const int32_t mContentIndex; // null for 'content:no-open-quote', 'content:no-close-quote' and for // counter nodes for increments and resets (rather than uses) RefPtr<nsTextNode> mText; explicit nsGenConNode(int32_t aContentIndex) : mPseudoFrame(nullptr) , mContentIndex(aContentIndex) { } /** * Finish initializing the generated content node once we know the * relevant text frame. This must be called just after * the textframe has been initialized. This need not be called at all * for nodes that don't generate text. This will generally set the * mPseudoFrame, insert the node into aList, and set aTextFrame up * with the correct text. * @param aList the list the node belongs to * @param aPseudoFrame the :before or :after frame * @param aTextFrame the textframe where the node contents will render * @return true iff this marked the list dirty */ virtual bool InitTextFrame(nsGenConList* aList, nsIFrame* aPseudoFrame, nsIFrame* aTextFrame) { mPseudoFrame = aPseudoFrame; CheckFrameAssertions(); return false; } virtual ~nsGenConNode() {} // XXX Avoid, perhaps? protected: void CheckFrameAssertions() { NS_ASSERTION(mContentIndex < int32_t(mPseudoFrame->StyleContent()->ContentCount()), "index out of range"); // We allow negative values of mContentIndex for 'counter-reset' and // 'counter-increment'. NS_ASSERTION(mContentIndex < 0 || mPseudoFrame->StyleContext()->GetPseudo() == nsCSSPseudoElements::before || mPseudoFrame->StyleContext()->GetPseudo() == nsCSSPseudoElements::after, "not :before/:after generated content and not counter change"); NS_ASSERTION(mContentIndex < 0 || mPseudoFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT, "not generated content and not counter change"); } }; class nsGenConList { protected: mozilla::LinkedList<nsGenConNode> mList; uint32_t mSize; public: nsGenConList() : mSize(0) {} ~nsGenConList() { Clear(); } void Clear(); static nsGenConNode* Next(nsGenConNode* aNode) { MOZ_ASSERT(aNode, "aNode cannot be nullptr!"); return aNode->getNext(); } static nsGenConNode* Prev(nsGenConNode* aNode) { MOZ_ASSERT(aNode, "aNode cannot be nullptr!"); return aNode->getPrevious(); } void Insert(nsGenConNode* aNode); // Destroy all nodes with aFrame as parent. Returns true if some nodes // have been destroyed; otherwise false. bool DestroyNodesFor(nsIFrame* aFrame); // Return true if |aNode1| is after |aNode2|. static bool NodeAfter(const nsGenConNode* aNode1, const nsGenConNode* aNode2); bool IsFirst(nsGenConNode* aNode) { MOZ_ASSERT(aNode, "aNode cannot be nullptr!"); return aNode == mList.getFirst(); } bool IsLast(nsGenConNode* aNode) { MOZ_ASSERT(aNode, "aNode cannot be nullptr!"); return aNode == mList.getLast(); } private: void Destroy(nsGenConNode* aNode) { MOZ_ASSERT(aNode, "aNode cannot be nullptr!"); delete aNode; mSize--; } // Map from frame to the first nsGenConNode of it in the list. nsDataHashtable<nsPtrHashKey<nsIFrame>, nsGenConNode*> mNodes; }; #endif /* nsGenConList_h___ */