LCOV - code coverage report
Current view: directory - layout/generic - nsFrame.h (source / functions) Found Hit Coverage
Test: app.info Lines: 25 0 0.0 %
Date: 2012-07-07 Functions: 6 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *   Pierre Phaneuf <pp@ludusdesign.com>
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      27                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : 
      39                 : /* base class of all rendering objects */
      40                 : 
      41                 : #ifndef nsFrame_h___
      42                 : #define nsFrame_h___
      43                 : 
      44                 : #include "nsBox.h"
      45                 : #include "nsRect.h"
      46                 : #include "nsString.h"
      47                 : #include "prlog.h"
      48                 : 
      49                 : #include "nsIPresShell.h"
      50                 : #include "nsFrameSelection.h"
      51                 : #include "nsHTMLReflowState.h"
      52                 : #include "nsHTMLReflowMetrics.h"
      53                 : #include "nsHTMLParts.h"
      54                 : 
      55                 : /**
      56                 :  * nsFrame logging constants. We redefine the nspr
      57                 :  * PRLogModuleInfo.level field to be a bitfield.  Each bit controls a
      58                 :  * specific type of logging. Each logging operation has associated
      59                 :  * inline methods defined below.
      60                 :  */
      61                 : #define NS_FRAME_TRACE_CALLS        0x1
      62                 : #define NS_FRAME_TRACE_PUSH_PULL    0x2
      63                 : #define NS_FRAME_TRACE_CHILD_REFLOW 0x4
      64                 : #define NS_FRAME_TRACE_NEW_FRAMES   0x8
      65                 : 
      66                 : #define NS_FRAME_LOG_TEST(_lm,_bit) (PRIntn((_lm)->level) & (_bit))
      67                 : 
      68                 : #ifdef NS_DEBUG
      69                 : #define NS_FRAME_LOG(_bit,_args)                                \
      70                 :   PR_BEGIN_MACRO                                                \
      71                 :     if (NS_FRAME_LOG_TEST(nsFrame::GetLogModuleInfo(),_bit)) {  \
      72                 :       PR_LogPrint _args;                                        \
      73                 :     }                                                           \
      74                 :   PR_END_MACRO
      75                 : #else
      76                 : #define NS_FRAME_LOG(_bit,_args)
      77                 : #endif
      78                 : 
      79                 : // XXX Need to rework this so that logging is free when it's off
      80                 : #ifdef NS_DEBUG
      81                 : #define NS_FRAME_TRACE_IN(_method) Trace(_method, true)
      82                 : 
      83                 : #define NS_FRAME_TRACE_OUT(_method) Trace(_method, false)
      84                 : 
      85                 : // XXX remove me
      86                 : #define NS_FRAME_TRACE_MSG(_bit,_args)                          \
      87                 :   PR_BEGIN_MACRO                                                \
      88                 :     if (NS_FRAME_LOG_TEST(nsFrame::GetLogModuleInfo(),_bit)) {  \
      89                 :       TraceMsg _args;                                           \
      90                 :     }                                                           \
      91                 :   PR_END_MACRO
      92                 : 
      93                 : #define NS_FRAME_TRACE(_bit,_args)                              \
      94                 :   PR_BEGIN_MACRO                                                \
      95                 :     if (NS_FRAME_LOG_TEST(nsFrame::GetLogModuleInfo(),_bit)) {  \
      96                 :       TraceMsg _args;                                           \
      97                 :     }                                                           \
      98                 :   PR_END_MACRO
      99                 : 
     100                 : #define NS_FRAME_TRACE_REFLOW_IN(_method) Trace(_method, true)
     101                 : 
     102                 : #define NS_FRAME_TRACE_REFLOW_OUT(_method, _status) \
     103                 :   Trace(_method, false, _status)
     104                 : 
     105                 : #else
     106                 : #define NS_FRAME_TRACE(_bits,_args)
     107                 : #define NS_FRAME_TRACE_IN(_method)
     108                 : #define NS_FRAME_TRACE_OUT(_method)
     109                 : #define NS_FRAME_TRACE_MSG(_bits,_args)
     110                 : #define NS_FRAME_TRACE_REFLOW_IN(_method)
     111                 : #define NS_FRAME_TRACE_REFLOW_OUT(_method, _status)
     112                 : #endif
     113                 : 
     114                 : // Frame allocation boilerplate macros.  Every subclass of nsFrame
     115                 : // must define its own operator new and GetAllocatedSize.  If they do
     116                 : // not, the per-frame recycler lists in nsPresArena will not work
     117                 : // correctly, with potentially catastrophic consequences (not enough
     118                 : // memory is allocated for a frame object).
     119                 : 
     120                 : #define NS_DECL_FRAMEARENA_HELPERS                                \
     121                 :   NS_MUST_OVERRIDE void* operator new(size_t, nsIPresShell*);     \
     122                 :   virtual NS_MUST_OVERRIDE nsQueryFrame::FrameIID GetFrameId();
     123                 : 
     124                 : #define NS_IMPL_FRAMEARENA_HELPERS(class)                         \
     125                 :   void* class::operator new(size_t sz, nsIPresShell* aShell)      \
     126                 :   { return aShell->AllocateFrame(nsQueryFrame::class##_id, sz); } \
     127                 :   nsQueryFrame::FrameIID class::GetFrameId()                      \
     128                 :   { return nsQueryFrame::class##_id; }
     129                 : 
     130                 : //----------------------------------------------------------------------
     131                 : 
     132                 : struct nsBoxLayoutMetrics;
     133                 : 
     134                 : /**
     135                 :  * Implementation of a simple frame that's not splittable and has no
     136                 :  * child frames.
     137                 :  *
     138                 :  * Sets the NS_FRAME_SYNCHRONIZE_FRAME_AND_VIEW bit, so the default
     139                 :  * behavior is to keep the frame and view position and size in sync.
     140                 :  */
     141                 : class nsFrame : public nsBox
     142                 : {
     143                 : public:
     144                 :   /**
     145                 :    * Create a new "empty" frame that maps a given piece of content into a
     146                 :    * 0,0 area.
     147                 :    */
     148                 :   friend nsIFrame* NS_NewEmptyFrame(nsIPresShell* aShell,
     149                 :                                     nsStyleContext* aContext);
     150                 : 
     151                 : private:
     152                 :   // Left undefined; nsFrame objects are never allocated from the heap.
     153                 :   void* operator new(size_t sz) CPP_THROW_NEW;
     154                 : 
     155                 : protected:
     156                 :   // Overridden to prevent the global delete from being called, since
     157                 :   // the memory came out of an arena instead of the heap.
     158                 :   //
     159                 :   // Ideally this would be private and undefined, like the normal
     160                 :   // operator new.  Unfortunately, the C++ standard requires an
     161                 :   // overridden operator delete to be accessible to any subclass that
     162                 :   // defines a virtual destructor, so we can only make it protected;
     163                 :   // worse, some C++ compilers will synthesize calls to this function
     164                 :   // from the "deleting destructors" that they emit in case of
     165                 :   // delete-expressions, so it can't even be undefined.
     166                 :   void operator delete(void* aPtr, size_t sz);
     167                 : 
     168                 : public:
     169                 : 
     170                 :   // nsQueryFrame
     171                 :   NS_DECL_QUERYFRAME
     172                 :   NS_DECL_FRAMEARENA_HELPERS
     173                 : 
     174                 :   // nsIFrame
     175                 :   NS_IMETHOD  Init(nsIContent*      aContent,
     176                 :                    nsIFrame*        aParent,
     177                 :                    nsIFrame*        asPrevInFlow);
     178                 :   NS_IMETHOD  SetInitialChildList(ChildListID        aListID,
     179                 :                                   nsFrameList&       aChildList);
     180                 :   NS_IMETHOD  AppendFrames(ChildListID     aListID,
     181                 :                            nsFrameList&    aFrameList);
     182                 :   NS_IMETHOD  InsertFrames(ChildListID     aListID,
     183                 :                            nsIFrame*       aPrevFrame,
     184                 :                            nsFrameList&    aFrameList);
     185                 :   NS_IMETHOD  RemoveFrame(ChildListID     aListID,
     186                 :                           nsIFrame*       aOldFrame);
     187                 :   virtual void DestroyFrom(nsIFrame* aDestructRoot);
     188                 :   virtual nsStyleContext* GetAdditionalStyleContext(PRInt32 aIndex) const;
     189                 :   virtual void SetAdditionalStyleContext(PRInt32 aIndex,
     190                 :                                          nsStyleContext* aStyleContext);
     191                 :   virtual void SetParent(nsIFrame* aParent);
     192                 :   virtual nscoord GetBaseline() const;
     193                 :   virtual const nsFrameList& GetChildList(ChildListID aListID) const;
     194                 :   virtual void GetChildLists(nsTArray<ChildList>* aLists) const;
     195                 : 
     196                 :   NS_IMETHOD  HandleEvent(nsPresContext* aPresContext, 
     197                 :                           nsGUIEvent*     aEvent,
     198                 :                           nsEventStatus*  aEventStatus);
     199                 :   NS_IMETHOD  GetContentForEvent(nsEvent* aEvent,
     200                 :                                  nsIContent** aContent);
     201                 :   NS_IMETHOD  GetCursor(const nsPoint&    aPoint,
     202                 :                         nsIFrame::Cursor& aCursor);
     203                 : 
     204                 :   NS_IMETHOD  GetPointFromOffset(PRInt32                inOffset,
     205                 :                                  nsPoint*               outPoint);
     206                 : 
     207                 :   NS_IMETHOD  GetChildFrameContainingOffset(PRInt32     inContentOffset,
     208                 :                                  bool                   inHint,
     209                 :                                  PRInt32*               outFrameContentOffset,
     210                 :                                  nsIFrame*              *outChildFrame);
     211                 : 
     212                 :   static nsresult  GetNextPrevLineFromeBlockFrame(nsPresContext* aPresContext,
     213                 :                                         nsPeekOffsetStruct *aPos, 
     214                 :                                         nsIFrame *aBlockFrame, 
     215                 :                                         PRInt32 aLineStart, 
     216                 :                                         PRInt8 aOutSideLimit
     217                 :                                         );
     218                 : 
     219                 :   NS_IMETHOD  CharacterDataChanged(CharacterDataChangeInfo* aInfo);
     220                 :   NS_IMETHOD  AttributeChanged(PRInt32         aNameSpaceID,
     221                 :                                nsIAtom*        aAttribute,
     222                 :                                PRInt32         aModType);
     223                 :   virtual nsSplittableType GetSplittableType() const;
     224                 :   virtual nsIFrame* GetPrevContinuation() const;
     225                 :   NS_IMETHOD  SetPrevContinuation(nsIFrame*);
     226                 :   virtual nsIFrame* GetNextContinuation() const;
     227                 :   NS_IMETHOD  SetNextContinuation(nsIFrame*);
     228                 :   virtual nsIFrame* GetPrevInFlowVirtual() const;
     229                 :   NS_IMETHOD  SetPrevInFlow(nsIFrame*);
     230                 :   virtual nsIFrame* GetNextInFlowVirtual() const;
     231                 :   NS_IMETHOD  SetNextInFlow(nsIFrame*);
     232                 :   NS_IMETHOD  GetOffsetFromView(nsPoint& aOffset, nsIView** aView) const;
     233                 :   virtual nsIAtom* GetType() const;
     234                 : 
     235                 :   NS_IMETHOD  IsSelectable(bool* aIsSelectable, PRUint8* aSelectStyle) const;
     236                 : 
     237                 :   NS_IMETHOD  GetSelectionController(nsPresContext *aPresContext, nsISelectionController **aSelCon);
     238                 : 
     239                 :   virtual bool PeekOffsetNoAmount(bool aForward, PRInt32* aOffset);
     240                 :   virtual bool PeekOffsetCharacter(bool aForward, PRInt32* aOffset,
     241                 :                                      bool aRespectClusters = true);
     242                 :   virtual bool PeekOffsetWord(bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
     243                 :                                 PRInt32* aOffset, PeekWordState *aState);
     244                 :   /**
     245                 :    * Check whether we should break at a boundary between punctuation and
     246                 :    * non-punctuation. Only call it at a punctuation boundary
     247                 :    * (i.e. exactly one of the previous and next characters are punctuation).
     248                 :    * @param aForward true if we're moving forward in content order
     249                 :    * @param aPunctAfter true if the next character is punctuation
     250                 :    * @param aWhitespaceAfter true if the next character is whitespace
     251                 :    */
     252                 :   bool BreakWordBetweenPunctuation(const PeekWordState* aState,
     253                 :                                      bool aForward,
     254                 :                                      bool aPunctAfter, bool aWhitespaceAfter,
     255                 :                                      bool aIsKeyboardSelect);
     256                 : 
     257                 :   NS_IMETHOD  CheckVisibility(nsPresContext* aContext, PRInt32 aStartIndex, PRInt32 aEndIndex, bool aRecurse, bool *aFinished, bool *_retval);
     258                 : 
     259                 :   NS_IMETHOD  GetOffsets(PRInt32 &aStart, PRInt32 &aEnd) const;
     260                 :   virtual void ChildIsDirty(nsIFrame* aChild);
     261                 : 
     262                 : #ifdef ACCESSIBILITY
     263                 :   virtual already_AddRefed<nsAccessible> CreateAccessible();
     264                 : #endif
     265                 : 
     266               0 :   virtual nsIFrame* GetParentStyleContextFrame() const {
     267               0 :     return DoGetParentStyleContextFrame();
     268                 :   }
     269                 : 
     270                 :   /**
     271                 :    * Do the work for getting the parent style context frame so that
     272                 :    * other frame's |GetParentStyleContextFrame| methods can call this
     273                 :    * method on *another* frame.  (This function handles out-of-flow
     274                 :    * frames by using the frame manager's placeholder map and it also
     275                 :    * handles block-within-inline and generated content wrappers.)
     276                 :    */
     277                 :   nsIFrame* DoGetParentStyleContextFrame() const;
     278                 : 
     279                 :   virtual bool IsEmpty();
     280                 :   virtual bool IsSelfEmpty();
     281                 : 
     282                 :   virtual void MarkIntrinsicWidthsDirty();
     283                 :   virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext);
     284                 :   virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext);
     285                 :   virtual void AddInlineMinWidth(nsRenderingContext *aRenderingContext,
     286                 :                                  InlineMinWidthData *aData);
     287                 :   virtual void AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
     288                 :                                   InlinePrefWidthData *aData);
     289                 :   virtual IntrinsicWidthOffsetData
     290                 :     IntrinsicWidthOffsets(nsRenderingContext* aRenderingContext);
     291                 :   virtual IntrinsicSize GetIntrinsicSize();
     292                 :   virtual nsSize GetIntrinsicRatio();
     293                 : 
     294                 :   virtual nsSize ComputeSize(nsRenderingContext *aRenderingContext,
     295                 :                              nsSize aCBSize, nscoord aAvailableWidth,
     296                 :                              nsSize aMargin, nsSize aBorder, nsSize aPadding,
     297                 :                              bool aShrinkWrap);
     298                 : 
     299                 :   // Compute tight bounds assuming this frame honours its border, background
     300                 :   // and outline, its children's tight bounds, and nothing else.
     301                 :   nsRect ComputeSimpleTightBounds(gfxContext* aContext) const;
     302                 :   
     303                 :   /**
     304                 :    * A helper, used by |nsFrame::ComputeSize| (for frames that need to
     305                 :    * override only this part of ComputeSize), that computes the size
     306                 :    * that should be returned when 'width', 'height', and
     307                 :    * min/max-width/height are all 'auto' or equivalent.
     308                 :    *
     309                 :    * In general, frames that can accept any computed width/height should
     310                 :    * override only ComputeAutoSize, and frames that cannot do so need to
     311                 :    * override ComputeSize to enforce their width/height invariants.
     312                 :    *
     313                 :    * Implementations may optimize by returning a garbage width if
     314                 :    * GetStylePosition()->mWidth.GetUnit() != eStyleUnit_Auto, and
     315                 :    * likewise for height, since in such cases the result is guaranteed
     316                 :    * to be unused.
     317                 :    */
     318                 :   virtual nsSize ComputeAutoSize(nsRenderingContext *aRenderingContext,
     319                 :                                  nsSize aCBSize, nscoord aAvailableWidth,
     320                 :                                  nsSize aMargin, nsSize aBorder,
     321                 :                                  nsSize aPadding, bool aShrinkWrap);
     322                 : 
     323                 :   /**
     324                 :    * Utility function for ComputeAutoSize implementations.  Return
     325                 :    * max(GetMinWidth(), min(aWidthInCB, GetPrefWidth()))
     326                 :    */
     327                 :   nscoord ShrinkWidthToFit(nsRenderingContext *aRenderingContext,
     328                 :                            nscoord aWidthInCB);
     329                 : 
     330                 :   NS_IMETHOD  WillReflow(nsPresContext* aPresContext);
     331                 :   NS_IMETHOD  Reflow(nsPresContext*          aPresContext,
     332                 :                      nsHTMLReflowMetrics&     aDesiredSize,
     333                 :                      const nsHTMLReflowState& aReflowState,
     334                 :                      nsReflowStatus&          aStatus);
     335                 :   NS_IMETHOD  DidReflow(nsPresContext*           aPresContext,
     336                 :                         const nsHTMLReflowState*  aReflowState,
     337                 :                         nsDidReflowStatus         aStatus);
     338                 :   void ReflowAbsoluteFrames(nsPresContext*           aPresContext,
     339                 :                             nsHTMLReflowMetrics&     aDesiredSize,
     340                 :                             const nsHTMLReflowState& aReflowState,
     341                 :                             nsReflowStatus&          aStatus);
     342                 :   void FinishReflowWithAbsoluteFrames(nsPresContext*           aPresContext,
     343                 :                                       nsHTMLReflowMetrics&     aDesiredSize,
     344                 :                                       const nsHTMLReflowState& aReflowState,
     345                 :                                       nsReflowStatus&          aStatus);
     346                 :   void DestroyAbsoluteFrames(nsIFrame* aDestructRoot);
     347                 :   virtual bool CanContinueTextRun() const;
     348                 : 
     349                 :   virtual bool UpdateOverflow();
     350                 : 
     351                 :   // Selection Methods
     352                 :   // XXX Doc me... (in nsIFrame.h puhleeze)
     353                 :   // XXX If these are selection specific, then the name should imply selection
     354                 :   // rather than generic event processing, e.g., SelectionHandlePress...
     355                 :   NS_IMETHOD HandlePress(nsPresContext* aPresContext,
     356                 :                          nsGUIEvent *    aEvent,
     357                 :                          nsEventStatus*  aEventStatus);
     358                 : 
     359                 :   NS_IMETHOD HandleMultiplePress(nsPresContext* aPresContext,
     360                 :                          nsGUIEvent *    aEvent,
     361                 :                          nsEventStatus*  aEventStatus,
     362                 :                          bool            aControlHeld);
     363                 : 
     364                 :   NS_IMETHOD HandleDrag(nsPresContext* aPresContext,
     365                 :                         nsGUIEvent *    aEvent,
     366                 :                         nsEventStatus*  aEventStatus);
     367                 : 
     368                 :   NS_IMETHOD HandleRelease(nsPresContext* aPresContext,
     369                 :                            nsGUIEvent *    aEvent,
     370                 :                            nsEventStatus*  aEventStatus);
     371                 : 
     372                 :   NS_IMETHOD PeekBackwardAndForward(nsSelectionAmount aAmountBack,
     373                 :                                     nsSelectionAmount aAmountForward,
     374                 :                                     PRInt32 aStartPos,
     375                 :                                     nsPresContext* aPresContext,
     376                 :                                     bool aJumpLines,
     377                 :                                     bool aMultipleSelection);
     378                 : 
     379                 : 
     380                 :   // Helper for GetContentAndOffsetsFromPoint; calculation of content offsets
     381                 :   // in this function assumes there is no child frame that can be targeted.
     382                 :   virtual ContentOffsets CalcContentOffsetsFromFramePoint(nsPoint aPoint);
     383                 : 
     384                 :   // Box layout methods
     385                 :   virtual nsSize GetPrefSize(nsBoxLayoutState& aBoxLayoutState);
     386                 :   virtual nsSize GetMinSize(nsBoxLayoutState& aBoxLayoutState);
     387                 :   virtual nsSize GetMaxSize(nsBoxLayoutState& aBoxLayoutState);
     388                 :   virtual nscoord GetFlex(nsBoxLayoutState& aBoxLayoutState);
     389                 :   virtual nscoord GetBoxAscent(nsBoxLayoutState& aBoxLayoutState);
     390                 : 
     391                 :   // We compute and store the HTML content's overflow area. So don't
     392                 :   // try to compute it in the box code.
     393               0 :   virtual bool ComputesOwnOverflowArea() { return true; }
     394                 : 
     395                 :   //--------------------------------------------------
     396                 :   // Additional methods
     397                 : 
     398                 :   /**
     399                 :    * Helper method to invalidate portions of a standard container frame if the
     400                 :    * desired size indicates that the size has changed (specifically border,
     401                 :    * background and outline).
     402                 :    * We assume that the difference between the old frame area and the new
     403                 :    * frame area is invalidated by some other means.
     404                 :    * @param aDesiredSize the new size of the frame
     405                 :    */
     406                 :   void CheckInvalidateSizeChange(nsHTMLReflowMetrics&     aNewDesiredSize);
     407                 : 
     408                 :   // Helper function that tests if the frame tree is too deep; if it is
     409                 :   // it marks the frame as "unflowable", zeroes out the metrics, sets
     410                 :   // the reflow status, and returns true. Otherwise, the frame is
     411                 :   // unmarked "unflowable" and the metrics and reflow status are not
     412                 :   // touched and false is returned.
     413                 :   bool IsFrameTreeTooDeep(const nsHTMLReflowState& aReflowState,
     414                 :                             nsHTMLReflowMetrics& aMetrics,
     415                 :                             nsReflowStatus& aStatus);
     416                 : 
     417                 :   // Incorporate the child overflow areas into aOverflowAreas.
     418                 :   // If the child does not have a overflow, use the child area.
     419                 :   void ConsiderChildOverflow(nsOverflowAreas& aOverflowAreas,
     420                 :                              nsIFrame* aChildFrame);
     421                 : 
     422                 :   virtual const void* GetStyleDataExternal(nsStyleStructID aSID) const;
     423                 : 
     424                 : 
     425                 : #ifdef NS_DEBUG
     426                 :   /**
     427                 :    * Tracing method that writes a method enter/exit routine to the
     428                 :    * nspr log using the nsIFrame log module. The tracing is only
     429                 :    * done when the NS_FRAME_TRACE_CALLS bit is set in the log module's
     430                 :    * level field.
     431                 :    */
     432                 :   void Trace(const char* aMethod, bool aEnter);
     433                 :   void Trace(const char* aMethod, bool aEnter, nsReflowStatus aStatus);
     434                 :   void TraceMsg(const char* fmt, ...);
     435                 : 
     436                 :   // Helper function that verifies that each frame in the list has the
     437                 :   // NS_FRAME_IS_DIRTY bit set
     438                 :   static void VerifyDirtyBitSet(const nsFrameList& aFrameList);
     439                 : 
     440                 :   // Helper function to return the index in parent of the frame's content
     441                 :   // object. Returns -1 on error or if the frame doesn't have a content object
     442                 :   static PRInt32 ContentIndexInContainer(const nsIFrame* aFrame);
     443                 : 
     444               0 :   static void IndentBy(FILE* out, PRInt32 aIndent) {
     445               0 :     while (--aIndent >= 0) fputs("  ", out);
     446               0 :   }
     447                 :   
     448               0 :   void ListTag(FILE* out) const {
     449               0 :     ListTag(out, this);
     450               0 :   }
     451                 : 
     452               0 :   static void ListTag(FILE* out, const nsIFrame* aFrame) {
     453               0 :     nsAutoString tmp;
     454               0 :     aFrame->GetFrameName(tmp);
     455               0 :     fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
     456               0 :     fprintf(out, "@%p", static_cast<const void*>(aFrame));
     457               0 :   }
     458                 : 
     459                 :   static void XMLQuote(nsString& aString);
     460                 : 
     461                 :   /**
     462                 :    * Dump out the "base classes" regression data. This should dump
     463                 :    * out the interior data, not the "frame" XML container. And it
     464                 :    * should call the base classes same named method before doing
     465                 :    * anything specific in a derived class. This means that derived
     466                 :    * classes need not override DumpRegressionData unless they need
     467                 :    * some custom behavior that requires changing how the outer "frame"
     468                 :    * XML container is dumped.
     469                 :    */
     470                 :   virtual void DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent);
     471                 :   
     472                 :   nsresult MakeFrameName(const nsAString& aKind, nsAString& aResult) const;
     473                 : 
     474                 :   // Display Reflow Debugging 
     475                 :   static void* DisplayReflowEnter(nsPresContext*          aPresContext,
     476                 :                                   nsIFrame*                aFrame,
     477                 :                                   const nsHTMLReflowState& aReflowState);
     478                 :   static void* DisplayLayoutEnter(nsIFrame* aFrame);
     479                 :   static void* DisplayIntrinsicWidthEnter(nsIFrame* aFrame,
     480                 :                                           const char* aType);
     481                 :   static void* DisplayIntrinsicSizeEnter(nsIFrame* aFrame,
     482                 :                                          const char* aType);
     483                 :   static void  DisplayReflowExit(nsPresContext*      aPresContext,
     484                 :                                  nsIFrame*            aFrame,
     485                 :                                  nsHTMLReflowMetrics& aMetrics,
     486                 :                                  PRUint32             aStatus,
     487                 :                                  void*                aFrameTreeNode);
     488                 :   static void  DisplayLayoutExit(nsIFrame* aFrame,
     489                 :                                  void* aFrameTreeNode);
     490                 :   static void  DisplayIntrinsicWidthExit(nsIFrame* aFrame,
     491                 :                                          const char* aType,
     492                 :                                          nscoord aResult,
     493                 :                                          void* aFrameTreeNode);
     494                 :   static void  DisplayIntrinsicSizeExit(nsIFrame* aFrame,
     495                 :                                         const char* aType,
     496                 :                                         nsSize aResult,
     497                 :                                         void* aFrameTreeNode);
     498                 : 
     499                 :   static void DisplayReflowStartup();
     500                 :   static void DisplayReflowShutdown();
     501                 : #endif
     502                 : 
     503                 :   static void ShutdownLayerActivityTimer();
     504                 : 
     505                 :   /**
     506                 :    * Adds display item for standard CSS background if necessary.
     507                 :    * Does not check IsVisibleForPainting.
     508                 :    * @param aForceBackground draw the background even if the frame
     509                 :    * background style appears to have no background --- this is useful
     510                 :    * for frames that might receive a propagated background via
     511                 :    * nsCSSRendering::FindBackground
     512                 :    */
     513                 :   nsresult DisplayBackgroundUnconditional(nsDisplayListBuilder*   aBuilder,
     514                 :                                           const nsDisplayListSet& aLists,
     515                 :                                           bool aForceBackground = false);
     516                 :   /**
     517                 :    * Adds display items for standard CSS borders, background and outline for
     518                 :    * for this frame, as necessary. Checks IsVisibleForPainting and won't
     519                 :    * display anything if the frame is not visible.
     520                 :    * @param aForceBackground draw the background even if the frame
     521                 :    * background style appears to have no background --- this is useful
     522                 :    * for frames that might receive a propagated background via
     523                 :    * nsCSSRendering::FindBackground
     524                 :    */
     525                 :   nsresult DisplayBorderBackgroundOutline(nsDisplayListBuilder*   aBuilder,
     526                 :                                           const nsDisplayListSet& aLists,
     527                 :                                           bool aForceBackground = false);
     528                 :   /**
     529                 :    * Add a display item for the CSS outline. Does not check visibility.
     530                 :    */
     531                 :   nsresult DisplayOutlineUnconditional(nsDisplayListBuilder*   aBuilder,
     532                 :                                        const nsDisplayListSet& aLists);
     533                 :   /**
     534                 :    * Add a display item for the CSS outline, after calling
     535                 :    * IsVisibleForPainting to confirm we are visible.
     536                 :    */
     537                 :   nsresult DisplayOutline(nsDisplayListBuilder*   aBuilder,
     538                 :                           const nsDisplayListSet& aLists);
     539                 : 
     540                 :   /**
     541                 :    * Adjust the given parent frame to the right style context parent frame for
     542                 :    * the child, given the pseudo-type of the prospective child.  This handles
     543                 :    * things like walking out of table pseudos and so forth.
     544                 :    *
     545                 :    * @param aProspectiveParent what GetParent() on the child returns.
     546                 :    *                           Must not be null.
     547                 :    * @param aChildPseudo the child's pseudo type, if any.
     548                 :    */
     549                 :   static nsIFrame*
     550                 :   CorrectStyleParentFrame(nsIFrame* aProspectiveParent, nsIAtom* aChildPseudo);
     551                 : 
     552                 : protected:
     553                 :   // Protected constructor and destructor
     554                 :   nsFrame(nsStyleContext* aContext);
     555                 :   virtual ~nsFrame();
     556                 : 
     557                 :   /**
     558                 :    * To be called by |BuildDisplayLists| of this class or derived classes to add
     559                 :    * a translucent overlay if this frame's content is selected.
     560                 :    * @param aContentType an nsISelectionDisplay DISPLAY_ constant identifying
     561                 :    * which kind of content this is for
     562                 :    */
     563                 :   nsresult DisplaySelectionOverlay(nsDisplayListBuilder* aBuilder,
     564                 :       nsDisplayList* aList, PRUint16 aContentType = nsISelectionDisplay::DISPLAY_FRAMES);
     565                 : 
     566                 :   PRInt16 DisplaySelection(nsPresContext* aPresContext, bool isOkToTurnOn = false);
     567                 :   
     568                 :   // Style post processing hook
     569                 :   virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);
     570                 : 
     571                 : public:
     572                 :   //given a frame five me the first/last leaf available
     573                 :   //XXX Robert O'Callahan wants to move these elsewhere
     574                 :   static void GetLastLeaf(nsPresContext* aPresContext, nsIFrame **aFrame);
     575                 :   static void GetFirstLeaf(nsPresContext* aPresContext, nsIFrame **aFrame);
     576                 : 
     577                 :   // Return the line number of the aFrame, and (optionally) the containing block
     578                 :   // frame.
     579                 :   // If aScrollLock is true, don't break outside scrollframes when looking for a
     580                 :   // containing block frame.
     581                 :   static PRInt32 GetLineNumber(nsIFrame *aFrame,
     582                 :                                bool aLockScroll,
     583                 :                                nsIFrame** aContainingBlock = nsnull);
     584                 : 
     585                 :   /**
     586                 :    * Returns true if aFrame should apply overflow clipping.
     587                 :    */
     588               0 :   static bool ApplyOverflowClipping(const nsIFrame* aFrame,
     589                 :                                     const nsStyleDisplay* aDisp)
     590                 :   {
     591                 :     // clip overflow:-moz-hidden-unscrollable ...
     592               0 :     if (NS_UNLIKELY(aDisp->mOverflowX == NS_STYLE_OVERFLOW_CLIP)) {
     593               0 :       return true;
     594                 :     }
     595                 : 
     596                 :     // and overflow:hidden that we should interpret as -moz-hidden-unscrollable
     597               0 :     if (aDisp->mOverflowX == NS_STYLE_OVERFLOW_HIDDEN &&
     598                 :         aDisp->mOverflowY == NS_STYLE_OVERFLOW_HIDDEN) {
     599                 :       // REVIEW: these are the frame types that set up clipping.
     600               0 :       nsIAtom* type = aFrame->GetType();
     601               0 :       if (type == nsGkAtoms::tableFrame ||
     602                 :           type == nsGkAtoms::tableCellFrame ||
     603                 :           type == nsGkAtoms::bcTableCellFrame) {
     604               0 :         return true;
     605                 :       }
     606                 :     }
     607                 :     
     608                 :     // If we're paginated and a block, and have NS_BLOCK_CLIP_PAGINATED_OVERFLOW
     609                 :     // set, then we want to clip our overflow.
     610                 :     return
     611               0 :       aFrame->PresContext()->IsPaginated() &&
     612               0 :       (aFrame->GetStateBits() & NS_BLOCK_CLIP_PAGINATED_OVERFLOW) != 0 &&
     613               0 :       aFrame->GetType() == nsGkAtoms::blockFrame;
     614                 :   }
     615                 : 
     616                 : protected:
     617                 : 
     618                 :   // Test if we are selecting a table object:
     619                 :   //  Most table/cell selection requires that Ctrl (Cmd on Mac) key is down 
     620                 :   //   during a mouse click or drag. Exception is using Shift+click when
     621                 :   //   already in "table/cell selection mode" to extend a block selection
     622                 :   //  Get the parent content node and offset of the frame 
     623                 :   //   of the enclosing cell or table (if not inside a cell)
     624                 :   //  aTarget tells us what table element to select (currently only cell and table supported)
     625                 :   //  (enums for this are defined in nsIFrame.h)
     626                 :   NS_IMETHOD GetDataForTableSelection(const nsFrameSelection *aFrameSelection,
     627                 :                                       nsIPresShell *aPresShell, nsMouseEvent *aMouseEvent, 
     628                 :                                       nsIContent **aParentContent, PRInt32 *aContentOffset, 
     629                 :                                       PRInt32 *aTarget);
     630                 : 
     631                 :   // Fills aCursor with the appropriate information from ui
     632                 :   static void FillCursorInformationFromStyle(const nsStyleUserInterface* ui,
     633                 :                                              nsIFrame::Cursor& aCursor);
     634                 :   NS_IMETHOD DoLayout(nsBoxLayoutState& aBoxLayoutState);
     635                 : 
     636                 : #ifdef DEBUG_LAYOUT
     637                 :   virtual void GetBoxName(nsAutoString& aName);
     638                 : #endif
     639                 : 
     640                 :   void InitBoxMetrics(bool aClear);
     641                 :   nsBoxLayoutMetrics* BoxMetrics() const;
     642                 : 
     643                 :   // Fire DOM event. If no aContent argument use frame's mContent.
     644                 :   void FireDOMEvent(const nsAString& aDOMEventName, nsIContent *aContent = nsnull);
     645                 : 
     646                 : private:
     647                 :   nsresult BoxReflow(nsBoxLayoutState& aState,
     648                 :                      nsPresContext*    aPresContext,
     649                 :                      nsHTMLReflowMetrics&     aDesiredSize,
     650                 :                      nsRenderingContext* aRenderingContext,
     651                 :                      nscoord aX,
     652                 :                      nscoord aY,
     653                 :                      nscoord aWidth,
     654                 :                      nscoord aHeight,
     655                 :                      bool aMoveFrame = true);
     656                 : 
     657                 :   NS_IMETHODIMP RefreshSizeCache(nsBoxLayoutState& aState);
     658                 : 
     659                 :   virtual nsILineIterator* GetLineIterator();
     660                 : 
     661                 : #ifdef NS_DEBUG
     662                 : public:
     663                 :   // Formerly the nsIFrameDebug interface
     664                 : 
     665                 :   NS_IMETHOD  List(FILE* out, PRInt32 aIndent) const;
     666                 :   /**
     667                 :    * lists the frames beginning from the root frame
     668                 :    * - calls root frame's List(...)
     669                 :    */
     670                 :   static void RootFrameList(nsPresContext* aPresContext,
     671                 :                             FILE* out, PRInt32 aIndent);
     672                 : 
     673                 :   static void DumpFrameTree(nsIFrame* aFrame);
     674                 : 
     675                 :   /**
     676                 :    * Get a printable from of the name of the frame type.
     677                 :    * XXX This should be eliminated and we use GetType() instead...
     678                 :    */
     679                 :   NS_IMETHOD  GetFrameName(nsAString& aResult) const;
     680                 :   /**
     681                 :    * Return the state bits that are relevant to regression tests (that
     682                 :    * is, those bits which indicate a real difference when they differ
     683                 :    */
     684                 :   NS_IMETHOD_(nsFrameState)  GetDebugStateBits() const;
     685                 :   /**
     686                 :    * Called to dump out regression data that describes the layout
     687                 :    * of the frame and its children, and so on. The format of the
     688                 :    * data is dictated to be XML (using a specific DTD); the
     689                 :    * specific kind of data dumped is up to the frame itself, with
     690                 :    * the caveat that some base types are defined.
     691                 :    * For more information, see XXX.
     692                 :    */
     693                 :   NS_IMETHOD  DumpRegressionData(nsPresContext* aPresContext,
     694                 :                                  FILE* out, PRInt32 aIndent);
     695                 : 
     696                 :   /**
     697                 :    * See if style tree verification is enabled. To enable style tree
     698                 :    * verification add "styleverifytree:1" to your NSPR_LOG_MODULES
     699                 :    * environment variable (any non-zero debug level will work). Or,
     700                 :    * call SetVerifyStyleTreeEnable with true.
     701                 :    */
     702                 :   static bool GetVerifyStyleTreeEnable();
     703                 : 
     704                 :   /**
     705                 :    * Set the verify-style-tree enable flag.
     706                 :    */
     707                 :   static void SetVerifyStyleTreeEnable(bool aEnabled);
     708                 : 
     709                 :   /**
     710                 :    * The frame class and related classes share an nspr log module
     711                 :    * for logging frame activity.
     712                 :    *
     713                 :    * Note: the log module is created during library initialization which
     714                 :    * means that you cannot perform logging before then.
     715                 :    */
     716                 :   static PRLogModuleInfo* GetLogModuleInfo();
     717                 : 
     718                 :   // Show frame borders when rendering
     719                 :   static void ShowFrameBorders(bool aEnable);
     720                 :   static bool GetShowFrameBorders();
     721                 : 
     722                 :   // Show frame border of event target
     723                 :   static void ShowEventTargetFrameBorder(bool aEnable);
     724                 :   static bool GetShowEventTargetFrameBorder();
     725                 : 
     726                 : #endif
     727                 : #ifdef MOZ_DUMP_PAINTING
     728                 : public:
     729                 : 
     730                 :   static void PrintDisplayList(nsDisplayListBuilder* aBuilder,
     731                 :                                const nsDisplayList& aList,
     732                 :                                FILE* aFile = stdout);
     733                 : 
     734                 : #endif
     735                 : };
     736                 : 
     737                 : // Start Display Reflow Debugging
     738                 : #ifdef DEBUG
     739                 : 
     740                 :   struct DR_cookie {
     741                 :     DR_cookie(nsPresContext*          aPresContext,
     742                 :               nsIFrame*                aFrame, 
     743                 :               const nsHTMLReflowState& aReflowState,
     744                 :               nsHTMLReflowMetrics&     aMetrics,
     745                 :               nsReflowStatus&          aStatus);     
     746                 :     ~DR_cookie();
     747                 :     void Change() const;
     748                 : 
     749                 :     nsPresContext*          mPresContext;
     750                 :     nsIFrame*                mFrame;
     751                 :     const nsHTMLReflowState& mReflowState;
     752                 :     nsHTMLReflowMetrics&     mMetrics;
     753                 :     nsReflowStatus&          mStatus;    
     754                 :     void*                    mValue;
     755                 :   };
     756                 : 
     757                 :   struct DR_layout_cookie {
     758                 :     DR_layout_cookie(nsIFrame* aFrame);
     759                 :     ~DR_layout_cookie();
     760                 : 
     761                 :     nsIFrame* mFrame;
     762                 :     void* mValue;
     763                 :   };
     764                 :   
     765                 :   struct DR_intrinsic_width_cookie {
     766                 :     DR_intrinsic_width_cookie(nsIFrame* aFrame, const char* aType,
     767                 :                               nscoord& aResult);
     768                 :     ~DR_intrinsic_width_cookie();
     769                 : 
     770                 :     nsIFrame* mFrame;
     771                 :     const char* mType;
     772                 :     nscoord& mResult;
     773                 :     void* mValue;
     774                 :   };
     775                 :   
     776                 :   struct DR_intrinsic_size_cookie {
     777                 :     DR_intrinsic_size_cookie(nsIFrame* aFrame, const char* aType,
     778                 :                              nsSize& aResult);
     779                 :     ~DR_intrinsic_size_cookie();
     780                 : 
     781                 :     nsIFrame* mFrame;
     782                 :     const char* mType;
     783                 :     nsSize& mResult;
     784                 :     void* mValue;
     785                 :   };
     786                 : 
     787                 :   struct DR_init_constraints_cookie {
     788                 :     DR_init_constraints_cookie(nsIFrame* aFrame, nsHTMLReflowState* aState,
     789                 :                                nscoord aCBWidth, nscoord aCBHeight,
     790                 :                                const nsMargin* aBorder,
     791                 :                                const nsMargin* aPadding);
     792                 :     ~DR_init_constraints_cookie();
     793                 : 
     794                 :     nsIFrame* mFrame;
     795                 :     nsHTMLReflowState* mState;
     796                 :     void* mValue;
     797                 :   };
     798                 : 
     799                 :   struct DR_init_offsets_cookie {
     800                 :     DR_init_offsets_cookie(nsIFrame* aFrame, nsCSSOffsetState* aState,
     801                 :                            nscoord aCBWidth, const nsMargin* aBorder,
     802                 :                            const nsMargin* aPadding);
     803                 :     ~DR_init_offsets_cookie();
     804                 : 
     805                 :     nsIFrame* mFrame;
     806                 :     nsCSSOffsetState* mState;
     807                 :     void* mValue;
     808                 :   };
     809                 : 
     810                 :   struct DR_init_type_cookie {
     811                 :     DR_init_type_cookie(nsIFrame* aFrame, nsHTMLReflowState* aState);
     812                 :     ~DR_init_type_cookie();
     813                 : 
     814                 :     nsIFrame* mFrame;
     815                 :     nsHTMLReflowState* mState;
     816                 :     void* mValue;
     817                 :   };
     818                 : 
     819                 : #define DISPLAY_REFLOW(dr_pres_context, dr_frame, dr_rf_state, dr_rf_metrics, dr_rf_status) \
     820                 :   DR_cookie dr_cookie(dr_pres_context, dr_frame, dr_rf_state, dr_rf_metrics, dr_rf_status); 
     821                 : #define DISPLAY_REFLOW_CHANGE() \
     822                 :   dr_cookie.Change();
     823                 : #define DISPLAY_LAYOUT(dr_frame) \
     824                 :   DR_layout_cookie dr_cookie(dr_frame); 
     825                 : #define DISPLAY_MIN_WIDTH(dr_frame, dr_result) \
     826                 :   DR_intrinsic_width_cookie dr_cookie(dr_frame, "Min", dr_result)
     827                 : #define DISPLAY_PREF_WIDTH(dr_frame, dr_result) \
     828                 :   DR_intrinsic_width_cookie dr_cookie(dr_frame, "Pref", dr_result)
     829                 : #define DISPLAY_PREF_SIZE(dr_frame, dr_result) \
     830                 :   DR_intrinsic_size_cookie dr_cookie(dr_frame, "Pref", dr_result)
     831                 : #define DISPLAY_MIN_SIZE(dr_frame, dr_result) \
     832                 :   DR_intrinsic_size_cookie dr_cookie(dr_frame, "Min", dr_result)
     833                 : #define DISPLAY_MAX_SIZE(dr_frame, dr_result) \
     834                 :   DR_intrinsic_size_cookie dr_cookie(dr_frame, "Max", dr_result)
     835                 : #define DISPLAY_INIT_CONSTRAINTS(dr_frame, dr_state, dr_cbw, dr_cbh,       \
     836                 :                                  dr_bdr, dr_pad)                           \
     837                 :   DR_init_constraints_cookie dr_cookie(dr_frame, dr_state, dr_cbw, dr_cbh, \
     838                 :                                        dr_bdr, dr_pad)
     839                 : #define DISPLAY_INIT_OFFSETS(dr_frame, dr_state, dr_cbw, dr_bdr, dr_pad)  \
     840                 :   DR_init_offsets_cookie dr_cookie(dr_frame, dr_state, dr_cbw, dr_bdr, dr_pad)
     841                 : #define DISPLAY_INIT_TYPE(dr_frame, dr_result) \
     842                 :   DR_init_type_cookie dr_cookie(dr_frame, dr_result)
     843                 : 
     844                 : #else
     845                 : 
     846                 : #define DISPLAY_REFLOW(dr_pres_context, dr_frame, dr_rf_state, dr_rf_metrics, dr_rf_status) 
     847                 : #define DISPLAY_REFLOW_CHANGE() 
     848                 : #define DISPLAY_LAYOUT(dr_frame) PR_BEGIN_MACRO PR_END_MACRO
     849                 : #define DISPLAY_MIN_WIDTH(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
     850                 : #define DISPLAY_PREF_WIDTH(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
     851                 : #define DISPLAY_PREF_SIZE(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
     852                 : #define DISPLAY_MIN_SIZE(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
     853                 : #define DISPLAY_MAX_SIZE(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
     854                 : #define DISPLAY_INIT_CONSTRAINTS(dr_frame, dr_state, dr_cbw, dr_cbh,       \
     855                 :                                  dr_bdr, dr_pad)                           \
     856                 :   PR_BEGIN_MACRO PR_END_MACRO
     857                 : #define DISPLAY_INIT_OFFSETS(dr_frame, dr_state, dr_cbw, dr_bdr, dr_pad)  \
     858                 :   PR_BEGIN_MACRO PR_END_MACRO
     859                 : #define DISPLAY_INIT_TYPE(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
     860                 : 
     861                 : #endif
     862                 : // End Display Reflow Debugging
     863                 : 
     864                 : // similar to NS_ENSURE_TRUE but with no return value
     865                 : #define ENSURE_TRUE(x)                                        \
     866                 :   PR_BEGIN_MACRO                                              \
     867                 :     if (!(x)) {                                               \
     868                 :        NS_WARNING("ENSURE_TRUE(" #x ") failed");              \
     869                 :        return;                                                \
     870                 :     }                                                         \
     871                 :   PR_END_MACRO
     872                 : #endif /* nsFrame_h___ */

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