LCOV - app.info - layout/generic/nsFirstLetterFrame.cpp

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: | 2012-04-21 | 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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