LCOV - code coverage report
Current view: directory - layout/generic - nsAbsoluteContainingBlock.h (source / functions) Found Hit Coverage
Test: app.info Lines: 8 0 0.0 %
Date: 2012-06-02 Functions: 5 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                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      26                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : /*
      39                 :  * code for managing absolutely positioned children of a rendering
      40                 :  * object that is a containing block for them
      41                 :  */
      42                 : 
      43                 : #ifndef nsAbsoluteContainingBlock_h___
      44                 : #define nsAbsoluteContainingBlock_h___
      45                 : 
      46                 : #include "nsFrameList.h"
      47                 : #include "nsHTMLReflowState.h"
      48                 : #include "nsGkAtoms.h"
      49                 : #include "nsContainerFrame.h"
      50                 : 
      51                 : class nsIAtom;
      52                 : class nsIFrame;
      53                 : class nsPresContext;
      54                 : 
      55                 : /**
      56                 :  * This class contains the logic for being an absolute containing block.  This
      57                 :  * class is used within viewport frames (for frames representing content with
      58                 :  * fixed position) and blocks (for frames representing absolutely positioned
      59                 :  * content), since each set of frames is absolutely positioned with respect to
      60                 :  * its parent.
      61                 :  *
      62                 :  * There is no principal child list, just a named child list which contains
      63                 :  * the absolutely positioned frames (kAbsoluteList or kFixedList).
      64                 :  *
      65                 :  * All functions include as the first argument the frame that is delegating
      66                 :  * the request.
      67                 :  *
      68                 :  */
      69                 : class nsAbsoluteContainingBlock
      70               0 : {
      71                 : public:
      72                 :   typedef nsIFrame::ChildListID ChildListID;
      73                 : 
      74               0 :   nsAbsoluteContainingBlock(ChildListID aChildListID)
      75                 : #ifdef DEBUG
      76               0 :     : mChildListID(aChildListID)
      77                 : #endif
      78                 :   {
      79               0 :     NS_ASSERTION(mChildListID == nsIFrame::kAbsoluteList ||
      80                 :                  mChildListID == nsIFrame::kFixedList,
      81                 :                  "should either represent position:fixed or absolute content");
      82               0 :   }
      83                 : 
      84                 : #ifdef DEBUG
      85               0 :   ChildListID GetChildListID() const { return mChildListID; }
      86                 : #endif
      87                 : 
      88               0 :   const nsFrameList& GetChildList() const { return mAbsoluteFrames; }
      89                 :   void AppendChildList(nsTArray<nsIFrame::ChildList>* aLists,
      90                 :                        ChildListID aListID) const
      91                 :   {
      92                 :     NS_ASSERTION(aListID == GetChildListID(), "wrong list ID");
      93                 :     GetChildList().AppendIfNonempty(aLists, aListID);
      94                 :   }
      95                 : 
      96                 :   nsresult SetInitialChildList(nsIFrame*       aDelegatingFrame,
      97                 :                                ChildListID     aListID,
      98                 :                                nsFrameList&    aChildList);
      99                 :   nsresult AppendFrames(nsIFrame*      aDelegatingFrame,
     100                 :                         ChildListID    aListID,
     101                 :                         nsFrameList&   aFrameList);
     102                 :   nsresult InsertFrames(nsIFrame*      aDelegatingFrame,
     103                 :                         ChildListID    aListID,
     104                 :                         nsIFrame*      aPrevFrame,
     105                 :                         nsFrameList&   aFrameList);
     106                 :   void RemoveFrame(nsIFrame*      aDelegatingFrame,
     107                 :                    ChildListID    aListID,
     108                 :                    nsIFrame*      aOldFrame);
     109                 : 
     110                 :   // Called by the delegating frame after it has done its reflow first. This
     111                 :   // function will reflow any absolutely positioned child frames that need to
     112                 :   // be reflowed, e.g., because the absolutely positioned child frame has
     113                 :   // 'auto' for an offset, or a percentage based width or height.
     114                 :   // aOverflowAreas, if non-null, is unioned with (in the local
     115                 :   // coordinate space) the overflow areas of the absolutely positioned
     116                 :   // children.
     117                 :   // @param aForceReflow if this is false, reflow for some absolutely
     118                 :   //        positioned frames may be skipped based on whether they use
     119                 :   //        placeholders for positioning and on whether the containing block
     120                 :   //        width or height changed.
     121                 :   nsresult Reflow(nsContainerFrame*        aDelegatingFrame,
     122                 :                   nsPresContext*           aPresContext,
     123                 :                   const nsHTMLReflowState& aReflowState,
     124                 :                   nsReflowStatus&          aReflowStatus,
     125                 :                   nscoord                  aContainingBlockWidth,
     126                 :                   nscoord                  aContainingBlockHeight,
     127                 :                   bool                     aConstrainHeight,
     128                 :                   bool                     aCBWidthChanged,
     129                 :                   bool                     aCBHeightChanged,
     130                 :                   nsOverflowAreas*         aOverflowAreas);
     131                 : 
     132                 : 
     133                 :   void DestroyFrames(nsIFrame* aDelegatingFrame,
     134                 :                      nsIFrame* aDestructRoot);
     135                 : 
     136               0 :   bool    HasAbsoluteFrames() {return mAbsoluteFrames.NotEmpty();}
     137                 : 
     138                 :   // Mark our size-dependent absolute frames with NS_FRAME_HAS_DIRTY_CHILDREN
     139                 :   // so that we'll make sure to reflow them.
     140                 :   void MarkSizeDependentFramesDirty();
     141                 : 
     142                 :   // Mark all our absolute frames with NS_FRAME_IS_DIRTY
     143                 :   void MarkAllFramesDirty();
     144                 : 
     145                 : protected:
     146                 :   // Returns true if the position of f depends on the position of
     147                 :   // its placeholder or if the position or size of f depends on a
     148                 :   // containing block dimension that changed.
     149                 :   bool FrameDependsOnContainer(nsIFrame* f, bool aCBWidthChanged,
     150                 :                                  bool aCBHeightChanged);
     151                 : 
     152                 :   nsresult ReflowAbsoluteFrame(nsIFrame*                aDelegatingFrame,
     153                 :                                nsPresContext*          aPresContext,
     154                 :                                const nsHTMLReflowState& aReflowState,
     155                 :                                nscoord                  aContainingBlockWidth,
     156                 :                                nscoord                  aContainingBlockHeight,
     157                 :                                bool                     aConstrainHeight,
     158                 :                                nsIFrame*                aKidFrame,
     159                 :                                nsReflowStatus&          aStatus,
     160                 :                                nsOverflowAreas*         aOverflowAreas);
     161                 : 
     162                 :   // Mark our absolute frames dirty.  If aMarkAllDirty is true, all will be
     163                 :   // marked with NS_FRAME_IS_DIRTY.  Otherwise, the size-dependant ones will be
     164                 :   // marked with NS_FRAME_HAS_DIRTY_CHILDREN.
     165                 :   void DoMarkFramesDirty(bool aMarkAllDirty);
     166                 : 
     167                 : protected:
     168                 :   nsFrameList mAbsoluteFrames;  // additional named child list
     169                 : 
     170                 : #ifdef DEBUG
     171                 :   ChildListID const mChildListID; // kFixedList or kAbsoluteList
     172                 : 
     173                 :   // helper routine for debug printout
     174                 :   void PrettyUC(nscoord aSize,
     175                 :                 char*   aBuf);
     176                 : #endif
     177                 : };
     178                 : 
     179                 : #endif /* nsnsAbsoluteContainingBlock_h___ */
     180                 : 

Generated by: LCOV version 1.7