gecko-dev/layout/base/nsGenConList.h

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/* -*- 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 "nsIFrame.h"
#include "nsStyleStruct.h"
#include "prclist.h"
#include "nsIDOMCharacterData.h"
#include "nsCSSPseudoElements.h"
class nsGenConList;
struct nsGenConNode : public PRCList {
// 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)
nsCOMPtr<nsIDOMCharacterData> mText;
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:
nsGenConNode* mFirstNode;
uint32_t mSize;
public:
nsGenConList() : mFirstNode(nullptr), mSize(0) {}
~nsGenConList() { Clear(); }
void Clear();
static nsGenConNode* Next(nsGenConNode* aNode) {
return static_cast<nsGenConNode*>(PR_NEXT_LINK(aNode));
}
static nsGenConNode* Prev(nsGenConNode* aNode) {
return static_cast<nsGenConNode*>(PR_PREV_LINK(aNode));
}
void Insert(nsGenConNode* aNode);
// returns whether any nodes have been destroyed
bool DestroyNodesFor(nsIFrame* aFrame); //destroy all nodes with aFrame as parent
// Return true if |aNode1| is after |aNode2|.
static bool NodeAfter(const nsGenConNode* aNode1,
const nsGenConNode* aNode2);
void Remove(nsGenConNode* aNode) { PR_REMOVE_LINK(aNode); mSize--; }
bool IsLast(nsGenConNode* aNode) { return (Next(aNode) == mFirstNode); }
};
#endif /* nsGenConList_h___ */