The Tor Browser: layout/base/nsGenConList.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /* base class for nsCounterList and nsQuoteList */

     8 #ifndef nsGenConList_h___

     9 #define nsGenConList_h___

    11 #include "nsIFrame.h"

    12 #include "nsStyleStruct.h"

    13 #include "prclist.h"

    14 #include "nsIDOMCharacterData.h"

    15 #include "nsCSSPseudoElements.h"

    17 class nsGenConList;

    19 struct nsGenConNode : public PRCList {

    20   // The wrapper frame for all of the pseudo-element's content.  This

    21   // frame generally has useful style data and has the

    22   // NS_FRAME_GENERATED_CONTENT bit set (so we use it to track removal),

    23   // but does not necessarily for |nsCounterChangeNode|s.

    24   nsIFrame* mPseudoFrame;

    26   // Index within the list of things specified by the 'content' property,

    27   // which is needed to do 'content: open-quote open-quote' correctly,

    28   // and needed for similar cases for counters.

    29   const int32_t mContentIndex;

    31   // null for 'content:no-open-quote', 'content:no-close-quote' and for

    32   // counter nodes for increments and resets (rather than uses)

    33   nsCOMPtr<nsIDOMCharacterData> mText;

    35   nsGenConNode(int32_t aContentIndex)

    36     : mPseudoFrame(nullptr)

    37     , mContentIndex(aContentIndex)

    38   {

    39   }

    41   /**

    42    * Finish initializing the generated content node once we know the

    43    * relevant text frame. This must be called just after

    44    * the textframe has been initialized. This need not be called at all

    45    * for nodes that don't generate text. This will generally set the

    46    * mPseudoFrame, insert the node into aList, and set aTextFrame up

    47    * with the correct text.

    48    * @param aList the list the node belongs to

    49    * @param aPseudoFrame the :before or :after frame

    50    * @param aTextFrame the textframe where the node contents will render

    51    * @return true iff this marked the list dirty

    52    */

    53   virtual bool InitTextFrame(nsGenConList* aList, nsIFrame* aPseudoFrame,

    54                                nsIFrame* aTextFrame)

    55   {

    56     mPseudoFrame = aPseudoFrame;

    57     CheckFrameAssertions();

    58     return false;

    59   }

    61   virtual ~nsGenConNode() {} // XXX Avoid, perhaps?

    63 protected:

    64   void CheckFrameAssertions() {

    65     NS_ASSERTION(mContentIndex <

    66                    int32_t(mPseudoFrame->StyleContent()->ContentCount()),

    67                  "index out of range");

    68       // We allow negative values of mContentIndex for 'counter-reset' and

    69       // 'counter-increment'.

    71     NS_ASSERTION(mContentIndex < 0 ||

    72                  mPseudoFrame->StyleContext()->GetPseudo() ==

    73                    nsCSSPseudoElements::before ||

    74                  mPseudoFrame->StyleContext()->GetPseudo() ==

    75                    nsCSSPseudoElements::after,

    76                  "not :before/:after generated content and not counter change");

    77     NS_ASSERTION(mContentIndex < 0 ||

    78                  mPseudoFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT,

    79                  "not generated content and not counter change");

    80   }

    81 };

    83 class nsGenConList {

    84 protected:

    85   nsGenConNode* mFirstNode;

    86   uint32_t mSize;

    87 public:

    88   nsGenConList() : mFirstNode(nullptr), mSize(0) {}

    89   ~nsGenConList() { Clear(); }

    90   void Clear();

    91   static nsGenConNode* Next(nsGenConNode* aNode) {

    92     return static_cast<nsGenConNode*>(PR_NEXT_LINK(aNode));

    93   }

    94   static nsGenConNode* Prev(nsGenConNode* aNode) {

    95     return static_cast<nsGenConNode*>(PR_PREV_LINK(aNode));

    96   }

    97   void Insert(nsGenConNode* aNode);

    98   // returns whether any nodes have been destroyed

    99   bool DestroyNodesFor(nsIFrame* aFrame); //destroy all nodes with aFrame as parent

   101   // Return true if |aNode1| is after |aNode2|.

   102   static bool NodeAfter(const nsGenConNode* aNode1,

   103                           const nsGenConNode* aNode2);

   105   void Remove(nsGenConNode* aNode) { PR_REMOVE_LINK(aNode); mSize--; }

   106   bool IsLast(nsGenConNode* aNode) { return (Next(aNode) == mFirstNode); }

   107 };

   109 #endif /* nsGenConList_h___ */

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