LCOV - code coverage report
Current view: directory - layout/generic - nsFirstLetterFrame.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 163 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 Communicator client 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                 : /* rendering object for CSS :first-letter pseudo-element */
      39                 : 
      40                 : #include "nsCOMPtr.h"
      41                 : #include "nsFirstLetterFrame.h"
      42                 : #include "nsPresContext.h"
      43                 : #include "nsStyleContext.h"
      44                 : #include "nsIContent.h"
      45                 : #include "nsLineLayout.h"
      46                 : #include "nsGkAtoms.h"
      47                 : #include "nsAutoPtr.h"
      48                 : #include "nsStyleSet.h"
      49                 : #include "nsFrameManager.h"
      50                 : #include "nsPlaceholderFrame.h"
      51                 : #include "nsCSSFrameConstructor.h"
      52                 : 
      53                 : using namespace::mozilla;
      54                 : 
      55                 : nsIFrame*
      56               0 : NS_NewFirstLetterFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
      57                 : {
      58               0 :   return new (aPresShell) nsFirstLetterFrame(aContext);
      59                 : }
      60                 : 
      61               0 : NS_IMPL_FRAMEARENA_HELPERS(nsFirstLetterFrame)
      62                 : 
      63               0 : NS_QUERYFRAME_HEAD(nsFirstLetterFrame)
      64               0 :   NS_QUERYFRAME_ENTRY(nsFirstLetterFrame)
      65               0 : NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
      66                 : 
      67                 : #ifdef NS_DEBUG
      68                 : NS_IMETHODIMP
      69               0 : nsFirstLetterFrame::GetFrameName(nsAString& aResult) const
      70                 : {
      71               0 :   return MakeFrameName(NS_LITERAL_STRING("Letter"), aResult);
      72                 : }
      73                 : #endif
      74                 : 
      75                 : nsIAtom*
      76               0 : nsFirstLetterFrame::GetType() const
      77                 : {
      78               0 :   return nsGkAtoms::letterFrame;
      79                 : }
      80                 : 
      81                 : PRIntn
      82               0 : nsFirstLetterFrame::GetSkipSides() const
      83                 : {
      84               0 :   return 0;
      85                 : }
      86                 : 
      87                 : NS_IMETHODIMP
      88               0 : nsFirstLetterFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
      89                 :                                      const nsRect&           aDirtyRect,
      90                 :                                      const nsDisplayListSet& aLists)
      91                 : {
      92               0 :   return BuildDisplayListForInline(aBuilder, aDirtyRect, aLists);
      93                 : }
      94                 : 
      95                 : NS_IMETHODIMP
      96               0 : nsFirstLetterFrame::Init(nsIContent*      aContent,
      97                 :                          nsIFrame*        aParent,
      98                 :                          nsIFrame*        aPrevInFlow)
      99                 : {
     100               0 :   nsRefPtr<nsStyleContext> newSC;
     101               0 :   if (aPrevInFlow) {
     102                 :     // Get proper style context for ourselves.  We're creating the frame
     103                 :     // that represents everything *except* the first letter, so just create
     104                 :     // a style context like we would for a text node.
     105               0 :     nsStyleContext* parentStyleContext = mStyleContext->GetParent();
     106               0 :     if (parentStyleContext) {
     107                 :       newSC = mStyleContext->GetRuleNode()->GetPresContext()->StyleSet()->
     108               0 :         ResolveStyleForNonElement(parentStyleContext);
     109               0 :       if (newSC)
     110               0 :         SetStyleContextWithoutNotification(newSC);
     111                 :     }
     112                 :   }
     113                 : 
     114               0 :   return nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
     115                 : }
     116                 : 
     117                 : NS_IMETHODIMP
     118               0 : nsFirstLetterFrame::SetInitialChildList(ChildListID  aListID,
     119                 :                                         nsFrameList& aChildList)
     120                 : {
     121               0 :   nsFrameManager *frameManager = PresContext()->FrameManager();
     122                 : 
     123               0 :   for (nsFrameList::Enumerator e(aChildList); !e.AtEnd(); e.Next()) {
     124               0 :     NS_ASSERTION(e.get()->GetParent() == this, "Unexpected parent");
     125               0 :     frameManager->ReparentStyleContext(e.get());
     126                 :   }
     127                 : 
     128               0 :   mFrames.SetFrames(aChildList);
     129               0 :   return NS_OK;
     130                 : }
     131                 : 
     132                 : NS_IMETHODIMP
     133               0 : nsFirstLetterFrame::GetChildFrameContainingOffset(PRInt32 inContentOffset,
     134                 :                                                   bool inHint,
     135                 :                                                   PRInt32* outFrameContentOffset,
     136                 :                                                   nsIFrame **outChildFrame)
     137                 : {
     138               0 :   nsIFrame *kid = mFrames.FirstChild();
     139               0 :   if (kid)
     140                 :   {
     141               0 :     return kid->GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
     142                 :   }
     143                 :   else
     144               0 :     return nsFrame::GetChildFrameContainingOffset(inContentOffset, inHint, outFrameContentOffset, outChildFrame);
     145                 : }
     146                 : 
     147                 : // Needed for non-floating first-letter frames and for the continuations
     148                 : // following the first-letter that we also use nsFirstLetterFrame for.
     149                 : /* virtual */ void
     150               0 : nsFirstLetterFrame::AddInlineMinWidth(nsRenderingContext *aRenderingContext,
     151                 :                                       nsIFrame::InlineMinWidthData *aData)
     152                 : {
     153               0 :   DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::MIN_WIDTH);
     154               0 : }
     155                 : 
     156                 : // Needed for non-floating first-letter frames and for the continuations
     157                 : // following the first-letter that we also use nsFirstLetterFrame for.
     158                 : /* virtual */ void
     159               0 : nsFirstLetterFrame::AddInlinePrefWidth(nsRenderingContext *aRenderingContext,
     160                 :                                        nsIFrame::InlinePrefWidthData *aData)
     161                 : {
     162               0 :   DoInlineIntrinsicWidth(aRenderingContext, aData, nsLayoutUtils::PREF_WIDTH);
     163               0 : }
     164                 : 
     165                 : // Needed for floating first-letter frames.
     166                 : /* virtual */ nscoord
     167               0 : nsFirstLetterFrame::GetMinWidth(nsRenderingContext *aRenderingContext)
     168                 : {
     169               0 :   return nsLayoutUtils::MinWidthFromInline(this, aRenderingContext);
     170                 : }
     171                 : 
     172                 : // Needed for floating first-letter frames.
     173                 : /* virtual */ nscoord
     174               0 : nsFirstLetterFrame::GetPrefWidth(nsRenderingContext *aRenderingContext)
     175                 : {
     176               0 :   return nsLayoutUtils::PrefWidthFromInline(this, aRenderingContext);
     177                 : }
     178                 : 
     179                 : /* virtual */ nsSize
     180               0 : nsFirstLetterFrame::ComputeSize(nsRenderingContext *aRenderingContext,
     181                 :                                 nsSize aCBSize, nscoord aAvailableWidth,
     182                 :                                 nsSize aMargin, nsSize aBorder, nsSize aPadding,
     183                 :                                 bool aShrinkWrap)
     184                 : {
     185               0 :   if (GetPrevInFlow()) {
     186                 :     // We're wrapping the text *after* the first letter, so behave like an
     187                 :     // inline frame.
     188               0 :     return nsSize(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
     189                 :   }
     190                 :   return nsContainerFrame::ComputeSize(aRenderingContext,
     191               0 :       aCBSize, aAvailableWidth, aMargin, aBorder, aPadding, aShrinkWrap);
     192                 : }
     193                 : 
     194                 : NS_IMETHODIMP
     195               0 : nsFirstLetterFrame::Reflow(nsPresContext*          aPresContext,
     196                 :                            nsHTMLReflowMetrics&     aMetrics,
     197                 :                            const nsHTMLReflowState& aReflowState,
     198                 :                            nsReflowStatus&          aReflowStatus)
     199                 : {
     200               0 :   DO_GLOBAL_REFLOW_COUNT("nsFirstLetterFrame");
     201               0 :   DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aReflowStatus);
     202               0 :   nsresult rv = NS_OK;
     203                 : 
     204                 :   // Grab overflow list
     205               0 :   DrainOverflowFrames(aPresContext);
     206                 : 
     207               0 :   nsIFrame* kid = mFrames.FirstChild();
     208                 : 
     209                 :   // Setup reflow state for our child
     210               0 :   nsSize availSize(aReflowState.availableWidth, aReflowState.availableHeight);
     211               0 :   const nsMargin& bp = aReflowState.mComputedBorderPadding;
     212               0 :   nscoord lr = bp.left + bp.right;
     213               0 :   nscoord tb = bp.top + bp.bottom;
     214               0 :   NS_ASSERTION(availSize.width != NS_UNCONSTRAINEDSIZE,
     215                 :                "should no longer use unconstrained widths");
     216               0 :   availSize.width -= lr;
     217               0 :   if (NS_UNCONSTRAINEDSIZE != availSize.height) {
     218               0 :     availSize.height -= tb;
     219                 :   }
     220                 : 
     221                 :   // Reflow the child
     222               0 :   if (!aReflowState.mLineLayout) {
     223                 :     // When there is no lineLayout provided, we provide our own. The
     224                 :     // only time that the first-letter-frame is not reflowing in a
     225                 :     // line context is when its floating.
     226               0 :     nsHTMLReflowState rs(aPresContext, aReflowState, kid, availSize);
     227               0 :     nsLineLayout ll(aPresContext, nsnull, &aReflowState, nsnull);
     228                 : 
     229                 :     // For unicode-bidi: plaintext, we need to get the direction of the line
     230                 :     // from the resolved paragraph level of the child, not the block frame,
     231                 :     // because the block frame could be split by hard line breaks into
     232                 :     // multiple paragraphs with different base direction
     233                 :     PRUint8 direction;
     234               0 :     nsIFrame* containerFrame = ll.GetLineContainerFrame();
     235               0 :     if (containerFrame->GetStyleTextReset()->mUnicodeBidi &
     236                 :         NS_STYLE_UNICODE_BIDI_PLAINTEXT) {
     237               0 :       FramePropertyTable *propTable = aPresContext->PropertyTable();
     238               0 :       direction = NS_PTR_TO_INT32(propTable->Get(kid, BaseLevelProperty())) & 1;
     239                 :     } else {
     240               0 :       direction = containerFrame->GetStyleVisibility()->mDirection;
     241                 :     }
     242                 :     ll.BeginLineReflow(bp.left, bp.top, availSize.width, NS_UNCONSTRAINEDSIZE,
     243               0 :                        false, true, direction);
     244               0 :     rs.mLineLayout = &ll;
     245               0 :     ll.SetInFirstLetter(true);
     246               0 :     ll.SetFirstLetterStyleOK(true);
     247                 : 
     248               0 :     kid->WillReflow(aPresContext);
     249               0 :     kid->Reflow(aPresContext, aMetrics, rs, aReflowStatus);
     250                 : 
     251               0 :     ll.EndLineReflow();
     252               0 :     ll.SetInFirstLetter(false);
     253                 : 
     254                 :     // In the floating first-letter case, we need to set this ourselves;
     255                 :     // nsLineLayout::BeginSpan will set it in the other case
     256               0 :     mBaseline = aMetrics.ascent;
     257                 :   }
     258                 :   else {
     259                 :     // Pretend we are a span and reflow the child frame
     260               0 :     nsLineLayout* ll = aReflowState.mLineLayout;
     261                 :     bool          pushedFrame;
     262                 : 
     263                 :     ll->SetInFirstLetter(
     264               0 :       mStyleContext->GetPseudo() == nsCSSPseudoElements::firstLetter);
     265               0 :     ll->BeginSpan(this, &aReflowState, bp.left, availSize.width, &mBaseline);
     266               0 :     ll->ReflowFrame(kid, aReflowStatus, &aMetrics, pushedFrame);
     267               0 :     ll->EndSpan(this);
     268               0 :     ll->SetInFirstLetter(false);
     269                 :   }
     270                 : 
     271                 :   // Place and size the child and update the output metrics
     272               0 :   kid->SetRect(nsRect(bp.left, bp.top, aMetrics.width, aMetrics.height));
     273               0 :   kid->FinishAndStoreOverflow(&aMetrics);
     274               0 :   kid->DidReflow(aPresContext, nsnull, NS_FRAME_REFLOW_FINISHED);
     275                 : 
     276               0 :   aMetrics.width += lr;
     277               0 :   aMetrics.height += tb;
     278               0 :   aMetrics.ascent += bp.top;
     279                 : 
     280                 :   // Ensure that the overflow rect contains the child textframe's overflow rect.
     281                 :   // Note that if this is floating, the overline/underline drawable area is in
     282                 :   // the overflow rect of the child textframe.
     283               0 :   aMetrics.UnionOverflowAreasWithDesiredBounds();
     284               0 :   ConsiderChildOverflow(aMetrics.mOverflowAreas, kid);
     285                 : 
     286               0 :   if (!NS_INLINE_IS_BREAK_BEFORE(aReflowStatus)) {
     287                 :     // Create a continuation or remove existing continuations based on
     288                 :     // the reflow completion status.
     289               0 :     if (NS_FRAME_IS_COMPLETE(aReflowStatus)) {
     290               0 :       if (aReflowState.mLineLayout) {
     291               0 :         aReflowState.mLineLayout->SetFirstLetterStyleOK(false);
     292                 :       }
     293               0 :       nsIFrame* kidNextInFlow = kid->GetNextInFlow();
     294               0 :       if (kidNextInFlow) {
     295                 :         // Remove all of the childs next-in-flows
     296               0 :         static_cast<nsContainerFrame*>(kidNextInFlow->GetParent())
     297               0 :           ->DeleteNextInFlowChild(aPresContext, kidNextInFlow, true);
     298                 :       }
     299                 :     }
     300                 :     else {
     301                 :       // Create a continuation for the child frame if it doesn't already
     302                 :       // have one.
     303               0 :       if (!IsFloating()) {
     304                 :         nsIFrame* nextInFlow;
     305               0 :         rv = CreateNextInFlow(aPresContext, kid, nextInFlow);
     306               0 :         if (NS_FAILED(rv)) {
     307               0 :           return rv;
     308                 :         }
     309                 :     
     310                 :         // And then push it to our overflow list
     311               0 :         const nsFrameList& overflow = mFrames.RemoveFramesAfter(kid);
     312               0 :         if (overflow.NotEmpty()) {
     313               0 :           SetOverflowFrames(aPresContext, overflow);
     314                 :         }
     315               0 :       } else if (!kid->GetNextInFlow()) {
     316                 :         // For floating first letter frames (if a continuation wasn't already
     317                 :         // created for us) we need to put the continuation with the rest of the
     318                 :         // text that the first letter frame was made out of.
     319                 :         nsIFrame* continuation;
     320                 :         rv = CreateContinuationForFloatingParent(aPresContext, kid,
     321               0 :                                                  &continuation, true);
     322                 :       }
     323                 :     }
     324                 :   }
     325                 : 
     326               0 :   FinishAndStoreOverflow(&aMetrics);
     327                 : 
     328               0 :   NS_FRAME_SET_TRUNCATION(aReflowStatus, aReflowState, aMetrics);
     329               0 :   return rv;
     330                 : }
     331                 : 
     332                 : /* virtual */ bool
     333               0 : nsFirstLetterFrame::CanContinueTextRun() const
     334                 : {
     335                 :   // We can continue a text run through a first-letter frame.
     336               0 :   return true;
     337                 : }
     338                 : 
     339                 : nsresult
     340               0 : nsFirstLetterFrame::CreateContinuationForFloatingParent(nsPresContext* aPresContext,
     341                 :                                                         nsIFrame* aChild,
     342                 :                                                         nsIFrame** aContinuation,
     343                 :                                                         bool aIsFluid)
     344                 : {
     345               0 :   NS_ASSERTION(IsFloating(),
     346                 :                "can only call this on floating first letter frames");
     347               0 :   NS_PRECONDITION(aContinuation, "bad args");
     348                 : 
     349               0 :   *aContinuation = nsnull;
     350               0 :   nsresult rv = NS_OK;
     351                 : 
     352               0 :   nsIPresShell* presShell = aPresContext->PresShell();
     353                 :   nsPlaceholderFrame* placeholderFrame =
     354               0 :     presShell->FrameManager()->GetPlaceholderFrameFor(this);
     355               0 :   nsIFrame* parent = placeholderFrame->GetParent();
     356                 : 
     357                 :   nsIFrame* continuation;
     358                 :   rv = presShell->FrameConstructor()->
     359               0 :     CreateContinuingFrame(aPresContext, aChild, parent, &continuation, aIsFluid);
     360               0 :   if (NS_FAILED(rv) || !continuation) {
     361               0 :     return rv;
     362                 :   }
     363                 : 
     364                 :   // The continuation will have gotten the first letter style from it's
     365                 :   // prev continuation, so we need to repair the style context so it
     366                 :   // doesn't have the first letter styling.
     367               0 :   nsStyleContext* parentSC = this->GetStyleContext()->GetParent();
     368               0 :   if (parentSC) {
     369               0 :     nsRefPtr<nsStyleContext> newSC;
     370               0 :     newSC = presShell->StyleSet()->ResolveStyleForNonElement(parentSC);
     371               0 :     if (newSC) {
     372               0 :       continuation->SetStyleContext(newSC);
     373                 :     }
     374                 :   }
     375                 : 
     376                 :   //XXX Bidi may not be involved but we have to use the list name
     377                 :   // kNoReflowPrincipalList because this is just like creating a continuation
     378                 :   // except we have to insert it in a different place and we don't want a
     379                 :   // reflow command to try to be issued.
     380               0 :   nsFrameList temp(continuation, continuation);
     381               0 :   rv = parent->InsertFrames(kNoReflowPrincipalList, placeholderFrame, temp);
     382                 : 
     383               0 :   *aContinuation = continuation;
     384               0 :   return rv;
     385                 : }
     386                 : 
     387                 : void
     388               0 : nsFirstLetterFrame::DrainOverflowFrames(nsPresContext* aPresContext)
     389                 : {
     390               0 :   nsAutoPtr<nsFrameList> overflowFrames;
     391                 : 
     392                 :   // Check for an overflow list with our prev-in-flow
     393               0 :   nsFirstLetterFrame* prevInFlow = (nsFirstLetterFrame*)GetPrevInFlow();
     394               0 :   if (nsnull != prevInFlow) {
     395               0 :     overflowFrames = prevInFlow->StealOverflowFrames();
     396               0 :     if (overflowFrames) {
     397               0 :       NS_ASSERTION(mFrames.IsEmpty(), "bad overflow list");
     398                 : 
     399                 :       // When pushing and pulling frames we need to check for whether any
     400                 :       // views need to be reparented.
     401               0 :       nsContainerFrame::ReparentFrameViewList(aPresContext, *overflowFrames,
     402               0 :                                               prevInFlow, this);
     403               0 :       mFrames.InsertFrames(this, nsnull, *overflowFrames);
     404                 :     }
     405                 :   }
     406                 : 
     407                 :   // It's also possible that we have an overflow list for ourselves
     408               0 :   overflowFrames = StealOverflowFrames();
     409               0 :   if (overflowFrames) {
     410               0 :     NS_ASSERTION(mFrames.NotEmpty(), "overflow list w/o frames");
     411               0 :     mFrames.AppendFrames(nsnull, *overflowFrames);
     412                 :   }
     413                 : 
     414                 :   // Now repair our first frames style context (since we only reflow
     415                 :   // one frame there is no point in doing any other ones until they
     416                 :   // are reflowed)
     417               0 :   nsIFrame* kid = mFrames.FirstChild();
     418               0 :   if (kid) {
     419               0 :     nsRefPtr<nsStyleContext> sc;
     420               0 :     nsIContent* kidContent = kid->GetContent();
     421               0 :     if (kidContent) {
     422               0 :       NS_ASSERTION(kidContent->IsNodeOfType(nsINode::eTEXT),
     423                 :                    "should contain only text nodes");
     424               0 :       sc = aPresContext->StyleSet()->ResolveStyleForNonElement(mStyleContext);
     425               0 :       if (sc) {
     426               0 :         kid->SetStyleContext(sc);
     427                 :       }
     428                 :     }
     429                 :   }
     430               0 : }
     431                 : 
     432                 : nscoord
     433               0 : nsFirstLetterFrame::GetBaseline() const
     434                 : {
     435               0 :   return mBaseline;
     436                 : }

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