LCOV - code coverage report
Current view: directory - layout/generic - nsBlockReflowContext.h (source / functions) Found Hit Coverage
Test: app.info Lines: 3 0 0.0 %
Date: 2012-06-02 Functions: 2 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : // vim:cindent:ts=2:et:sw=2:
       3                 : /* ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is Mozilla Communicator client code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Netscape Communications Corporation.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      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                 : /* class that a parent frame uses to reflow a block frame */
      40                 : 
      41                 : #ifndef nsBlockReflowContext_h___
      42                 : #define nsBlockReflowContext_h___
      43                 : 
      44                 : #include "nsIFrame.h"
      45                 : #include "nsHTMLReflowMetrics.h"
      46                 : 
      47                 : class nsBlockFrame;
      48                 : class nsBlockReflowState;
      49                 : struct nsHTMLReflowState;
      50                 : class nsLineBox;
      51                 : class nsIFrame;
      52                 : class nsPresContext;
      53                 : class nsLineLayout;
      54                 : struct nsStylePosition;
      55                 : struct nsBlockHorizontalAlign;
      56                 : 
      57                 : /**
      58                 :  * An encapsulation of the state and algorithm for reflowing block frames.
      59                 :  */
      60                 : class nsBlockReflowContext {
      61                 : public:
      62                 :   nsBlockReflowContext(nsPresContext* aPresContext,
      63                 :                        const nsHTMLReflowState& aParentRS);
      64               0 :   ~nsBlockReflowContext() { }
      65                 : 
      66                 :   nsresult ReflowBlock(const nsRect&       aSpace,
      67                 :                        bool                aApplyTopMargin,
      68                 :                        nsCollapsingMargin& aPrevMargin,
      69                 :                        nscoord             aClearance,
      70                 :                        bool                aIsAdjacentWithTop,
      71                 :                        nsLineBox*          aLine,
      72                 :                        nsHTMLReflowState&  aReflowState,
      73                 :                        nsReflowStatus&     aReflowStatus,
      74                 :                        nsBlockReflowState& aState);
      75                 : 
      76                 :   bool PlaceBlock(const nsHTMLReflowState& aReflowState,
      77                 :                     bool                     aForceFit,
      78                 :                     nsLineBox*               aLine,
      79                 :                     nsCollapsingMargin&      aBottomMarginResult /* out */,
      80                 :                     nsRect&                  aInFlowBounds,
      81                 :                     nsOverflowAreas&         aOverflowAreas,
      82                 :                     nsReflowStatus           aReflowStatus);
      83                 : 
      84                 :   nsCollapsingMargin& GetCarriedOutBottomMargin() {
      85                 :     return mMetrics.mCarriedOutBottomMargin;
      86                 :   }
      87                 : 
      88                 :   nscoord GetTopMargin() const {
      89                 :     return mTopMargin.get();
      90                 :   }
      91                 : 
      92               0 :   const nsHTMLReflowMetrics& GetMetrics() const {
      93               0 :     return mMetrics;
      94                 :   }
      95                 : 
      96                 :   /**
      97                 :    * Computes the collapsed top margin for a block whose reflow state is in aRS.
      98                 :    * The computed margin is added into aMargin.
      99                 :    * If aClearanceFrame is null then this is the first optimistic pass which shall assume
     100                 :    * that no frames have clearance, and we clear the HasClearance on all frames encountered.
     101                 :    * If non-null, this is the second pass and
     102                 :    * the caller has decided aClearanceFrame needs clearance (and we will
     103                 :    * therefore stop collapsing there); also, this function is responsible for marking
     104                 :    * it with SetHasClearance.
     105                 :    * If in the optimistic pass any frame is encountered that might possibly need
     106                 :    * clearance (i.e., if we really needed the optimism assumption) then we set aMayNeedRetry
     107                 :    * to true.
     108                 :    * We return true if we changed the clearance state of any line and marked it dirty.
     109                 :    */
     110                 :   static bool ComputeCollapsedTopMargin(const nsHTMLReflowState& aRS,
     111                 :                                           nsCollapsingMargin* aMargin, nsIFrame* aClearanceFrame,
     112                 :                                           bool* aMayNeedRetry, bool* aIsEmpty = nsnull);
     113                 : 
     114                 : protected:
     115                 :   nsPresContext* mPresContext;
     116                 :   const nsHTMLReflowState& mOuterReflowState;
     117                 : 
     118                 :   nsIFrame* mFrame;
     119                 :   nsRect mSpace;
     120                 : 
     121                 :   nscoord mX, mY;
     122                 :   nsHTMLReflowMetrics mMetrics;
     123                 :   nsCollapsingMargin mTopMargin;
     124                 : };
     125                 : 
     126                 : #endif /* nsBlockReflowContext_h___ */

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