LCOV - code coverage report
Current view: directory - layout/generic - nsSplittableFrame.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 113 0 0.0 %
Date: 2012-06-02 Functions: 21 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                 :  * base class for rendering objects that can be split across lines,
      40                 :  * columns, or pages
      41                 :  */
      42                 : 
      43                 : #include "nsSplittableFrame.h"
      44                 : #include "nsIContent.h"
      45                 : #include "nsPresContext.h"
      46                 : #include "nsStyleContext.h"
      47                 : 
      48               0 : NS_IMPL_FRAMEARENA_HELPERS(nsSplittableFrame)
      49                 : 
      50                 : NS_IMETHODIMP
      51               0 : nsSplittableFrame::Init(nsIContent*      aContent,
      52                 :                         nsIFrame*        aParent,
      53                 :                         nsIFrame*        aPrevInFlow)
      54                 : {
      55               0 :   nsresult rv = nsFrame::Init(aContent, aParent, aPrevInFlow);
      56                 : 
      57               0 :   if (aPrevInFlow) {
      58                 :     // Hook the frame into the flow
      59               0 :     SetPrevInFlow(aPrevInFlow);
      60               0 :     aPrevInFlow->SetNextInFlow(this);
      61                 :   }
      62                 : 
      63               0 :   return rv;
      64                 : }
      65                 : 
      66                 : void
      67               0 : nsSplittableFrame::DestroyFrom(nsIFrame* aDestructRoot)
      68                 : {
      69                 :   // Disconnect from the flow list
      70               0 :   if (mPrevContinuation || mNextContinuation) {
      71               0 :     RemoveFromFlow(this);
      72                 :   }
      73                 : 
      74                 :   // Let the base class destroy the frame
      75               0 :   nsFrame::DestroyFrom(aDestructRoot);
      76               0 : }
      77                 : 
      78                 : nsSplittableType
      79               0 : nsSplittableFrame::GetSplittableType() const
      80                 : {
      81               0 :   return NS_FRAME_SPLITTABLE;
      82                 : }
      83                 : 
      84               0 : nsIFrame* nsSplittableFrame::GetPrevContinuation() const
      85                 : {
      86               0 :   return mPrevContinuation;
      87                 : }
      88                 : 
      89               0 : NS_METHOD nsSplittableFrame::SetPrevContinuation(nsIFrame* aFrame)
      90                 : {
      91               0 :   NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev continuation with incorrect type!");
      92               0 :   NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
      93               0 :   mPrevContinuation = aFrame;
      94               0 :   RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
      95               0 :   return NS_OK;
      96                 : }
      97                 : 
      98               0 : nsIFrame* nsSplittableFrame::GetNextContinuation() const
      99                 : {
     100               0 :   return mNextContinuation;
     101                 : }
     102                 : 
     103               0 : NS_METHOD nsSplittableFrame::SetNextContinuation(nsIFrame* aFrame)
     104                 : {
     105               0 :   NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(),  "setting a next continuation with incorrect type!");
     106               0 :   NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
     107               0 :   mNextContinuation = aFrame;
     108               0 :   if (aFrame)
     109               0 :     aFrame->RemoveStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
     110               0 :   return NS_OK;
     111                 : }
     112                 : 
     113               0 : nsIFrame* nsSplittableFrame::GetFirstContinuation() const
     114                 : {
     115               0 :   nsSplittableFrame* firstContinuation = const_cast<nsSplittableFrame*>(this);
     116               0 :   while (firstContinuation->mPrevContinuation)  {
     117               0 :     firstContinuation = static_cast<nsSplittableFrame*>(firstContinuation->mPrevContinuation);
     118                 :   }
     119               0 :   NS_POSTCONDITION(firstContinuation, "illegal state in continuation chain.");
     120               0 :   return firstContinuation;
     121                 : }
     122                 : 
     123               0 : nsIFrame* nsSplittableFrame::GetLastContinuation() const
     124                 : {
     125               0 :   nsSplittableFrame* lastContinuation = const_cast<nsSplittableFrame*>(this);
     126               0 :   while (lastContinuation->mNextContinuation)  {
     127               0 :     lastContinuation = static_cast<nsSplittableFrame*>(lastContinuation->mNextContinuation);
     128                 :   }
     129               0 :   NS_POSTCONDITION(lastContinuation, "illegal state in continuation chain.");
     130               0 :   return lastContinuation;
     131                 : }
     132                 : 
     133                 : #ifdef DEBUG
     134               0 : bool nsSplittableFrame::IsInPrevContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
     135                 : {
     136               0 :   PRInt32 iterations = 0;
     137               0 :   while (aFrame1 && iterations < 10) {
     138                 :     // Bail out after 10 iterations so we don't bog down debug builds too much
     139               0 :     if (aFrame1 == aFrame2)
     140               0 :       return true;
     141               0 :     aFrame1 = aFrame1->GetPrevContinuation();
     142               0 :     ++iterations;
     143                 :   }
     144               0 :   return false;
     145                 : }
     146                 : 
     147               0 : bool nsSplittableFrame::IsInNextContinuationChain(nsIFrame* aFrame1, nsIFrame* aFrame2)
     148                 : {
     149               0 :   PRInt32 iterations = 0;
     150               0 :   while (aFrame1 && iterations < 10) {
     151                 :     // Bail out after 10 iterations so we don't bog down debug builds too much
     152               0 :     if (aFrame1 == aFrame2)
     153               0 :       return true;
     154               0 :     aFrame1 = aFrame1->GetNextContinuation();
     155               0 :     ++iterations;
     156                 :   }
     157               0 :   return false;
     158                 : }
     159                 : #endif
     160                 : 
     161               0 : nsIFrame* nsSplittableFrame::GetPrevInFlow() const
     162                 : {
     163               0 :   return (GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ? mPrevContinuation : nsnull;
     164                 : }
     165                 : 
     166               0 : NS_METHOD nsSplittableFrame::SetPrevInFlow(nsIFrame* aFrame)
     167                 : {
     168               0 :   NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(), "setting a prev in flow with incorrect type!");
     169               0 :   NS_ASSERTION (!IsInPrevContinuationChain(aFrame, this), "creating a loop in continuation chain!");
     170               0 :   mPrevContinuation = aFrame;
     171               0 :   AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
     172               0 :   return NS_OK;
     173                 : }
     174                 : 
     175               0 : nsIFrame* nsSplittableFrame::GetNextInFlow() const
     176                 : {
     177               0 :   return mNextContinuation && (mNextContinuation->GetStateBits() & NS_FRAME_IS_FLUID_CONTINUATION) ? 
     178               0 :     mNextContinuation : nsnull;
     179                 : }
     180                 : 
     181               0 : NS_METHOD nsSplittableFrame::SetNextInFlow(nsIFrame* aFrame)
     182                 : {
     183               0 :   NS_ASSERTION (!aFrame || GetType() == aFrame->GetType(),  "setting a next in flow with incorrect type!");
     184               0 :   NS_ASSERTION (!IsInNextContinuationChain(aFrame, this), "creating a loop in continuation chain!");
     185               0 :   mNextContinuation = aFrame;
     186               0 :   if (aFrame)
     187               0 :     aFrame->AddStateBits(NS_FRAME_IS_FLUID_CONTINUATION);
     188               0 :   return NS_OK;
     189                 : }
     190                 : 
     191               0 : nsIFrame* nsSplittableFrame::GetFirstInFlow() const
     192                 : {
     193               0 :   nsSplittableFrame* firstInFlow = const_cast<nsSplittableFrame*>(this);
     194               0 :   while (nsIFrame *prev = firstInFlow->GetPrevInFlow())  {
     195               0 :     firstInFlow = static_cast<nsSplittableFrame*>(prev);
     196                 :   }
     197               0 :   NS_POSTCONDITION(firstInFlow, "illegal state in flow chain.");
     198               0 :   return firstInFlow;
     199                 : }
     200                 : 
     201               0 : nsIFrame* nsSplittableFrame::GetLastInFlow() const
     202                 : {
     203               0 :   nsSplittableFrame* lastInFlow = const_cast<nsSplittableFrame*>(this);
     204               0 :   while (nsIFrame* next = lastInFlow->GetNextInFlow())  {
     205               0 :     lastInFlow = static_cast<nsSplittableFrame*>(next);
     206                 :   }
     207               0 :   NS_POSTCONDITION(lastInFlow, "illegal state in flow chain.");
     208               0 :   return lastInFlow;
     209                 : }
     210                 : 
     211                 : // Remove this frame from the flow. Connects prev in flow and next in flow
     212                 : void
     213               0 : nsSplittableFrame::RemoveFromFlow(nsIFrame* aFrame)
     214                 : {
     215               0 :   nsIFrame* prevContinuation = aFrame->GetPrevContinuation();
     216               0 :   nsIFrame* nextContinuation = aFrame->GetNextContinuation();
     217                 : 
     218                 :   // The new continuation is fluid only if the continuation on both sides
     219                 :   // of the removed frame was fluid
     220               0 :   if (aFrame->GetPrevInFlow() && aFrame->GetNextInFlow()) {
     221               0 :     if (prevContinuation) {
     222               0 :       prevContinuation->SetNextInFlow(nextContinuation);
     223                 :     }
     224               0 :     if (nextContinuation) {
     225               0 :       nextContinuation->SetPrevInFlow(prevContinuation);
     226                 :     }
     227                 :   } else {
     228               0 :     if (prevContinuation) {
     229               0 :       prevContinuation->SetNextContinuation(nextContinuation);
     230                 :     }
     231               0 :     if (nextContinuation) {
     232               0 :       nextContinuation->SetPrevContinuation(prevContinuation);
     233                 :     }
     234                 :   }
     235                 : 
     236               0 :   aFrame->SetPrevInFlow(nsnull);
     237               0 :   aFrame->SetNextInFlow(nsnull);
     238               0 : }
     239                 : 
     240                 : #ifdef DEBUG
     241                 : void
     242               0 : nsSplittableFrame::DumpBaseRegressionData(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent)
     243                 : {
     244               0 :   nsFrame::DumpBaseRegressionData(aPresContext, out, aIndent);
     245               0 :   if (nsnull != mNextContinuation) {
     246               0 :     IndentBy(out, aIndent);
     247               0 :     fprintf(out, "<next-continuation va=\"%ld\"/>\n", PRUptrdiff(mNextContinuation));
     248                 :   }
     249               0 :   if (nsnull != mPrevContinuation) {
     250               0 :     IndentBy(out, aIndent);
     251               0 :     fprintf(out, "<prev-continuation va=\"%ld\"/>\n", PRUptrdiff(mPrevContinuation));
     252                 :   }
     253                 : 
     254               0 : }
     255                 : #endif

Generated by: LCOV version 1.7