LCOV - code coverage report
Current view: directory - layout/generic - TextOverflow.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 365 0 0.0 %
Date: 2012-06-02 Functions: 29 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
       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 an implementation of CSS3 text-overflow.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is the Mozilla Foundation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2011
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *   Mats Palmgren <matspal@gmail.com> (original author)
      24                 :  *   Michael Ventnor <m.ventnor@gmail.com>
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      28                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : #include "TextOverflow.h"
      41                 : 
      42                 : // Please maintain alphabetical order below
      43                 : #include "nsBlockFrame.h"
      44                 : #include "nsCaret.h"
      45                 : #include "nsContentUtils.h"
      46                 : #include "nsGfxScrollFrame.h"
      47                 : #include "nsIScrollableFrame.h"
      48                 : #include "nsLayoutUtils.h"
      49                 : #include "nsPresContext.h"
      50                 : #include "nsRect.h"
      51                 : #include "nsRenderingContext.h"
      52                 : #include "nsTextFrame.h"
      53                 : #include "mozilla/Util.h"
      54                 : 
      55                 : namespace mozilla {
      56                 : namespace css {
      57                 : 
      58                 : static const PRUnichar kEllipsisChar[] = { 0x2026, 0x0 };
      59                 : static const PRUnichar kASCIIPeriodsChar[] = { '.', '.', '.', 0x0 };
      60                 : 
      61                 : // Return an ellipsis if the font supports it,
      62                 : // otherwise use three ASCII periods as fallback.
      63               0 : static nsDependentString GetEllipsis(nsFontMetrics *aFontMetrics)
      64                 : {
      65                 :   // Check if the first font supports Unicode ellipsis.
      66               0 :   gfxFontGroup* fontGroup = aFontMetrics->GetThebesFontGroup();
      67               0 :   gfxFont* firstFont = fontGroup->GetFontAt(0);
      68               0 :   return firstFont && firstFont->HasCharacter(kEllipsisChar[0])
      69                 :     ? nsDependentString(kEllipsisChar,
      70               0 :                         ArrayLength(kEllipsisChar) - 1)
      71                 :     : nsDependentString(kASCIIPeriodsChar,
      72               0 :                         ArrayLength(kASCIIPeriodsChar) - 1);
      73                 : }
      74                 : 
      75                 : static nsIFrame*
      76               0 : GetSelfOrNearestBlock(nsIFrame* aFrame)
      77                 : {
      78               0 :   return nsLayoutUtils::GetAsBlock(aFrame) ? aFrame :
      79               0 :          nsLayoutUtils::FindNearestBlockAncestor(aFrame);
      80                 : }
      81                 : 
      82                 : // Return true if the frame is an atomic inline-level element.
      83                 : // It's not supposed to be called for block frames since we never
      84                 : // process block descendants for text-overflow.
      85                 : static bool
      86               0 : IsAtomicElement(nsIFrame* aFrame, const nsIAtom* aFrameType)
      87                 : {
      88               0 :   NS_PRECONDITION(!nsLayoutUtils::GetAsBlock(aFrame) ||
      89                 :                   !aFrame->GetStyleDisplay()->IsBlockOutside(),
      90                 :                   "unexpected block frame");
      91               0 :   NS_PRECONDITION(aFrameType != nsGkAtoms::placeholderFrame,
      92                 :                   "unexpected placeholder frame");
      93               0 :   return !aFrame->IsFrameOfType(nsIFrame::eLineParticipant);
      94                 : }
      95                 : 
      96                 : static bool
      97               0 : IsFullyClipped(nsTextFrame* aFrame, nscoord aLeft, nscoord aRight,
      98                 :                nscoord* aSnappedLeft, nscoord* aSnappedRight)
      99                 : {
     100               0 :   *aSnappedLeft = aLeft;
     101               0 :   *aSnappedRight = aRight;
     102               0 :   if (aLeft <= 0 && aRight <= 0) {
     103               0 :     return false;
     104                 :   }
     105                 :   return !aFrame->MeasureCharClippedText(aLeft, aRight,
     106               0 :                                          aSnappedLeft, aSnappedRight);
     107                 : }
     108                 : 
     109                 : static bool
     110               0 : IsHorizontalOverflowVisible(nsIFrame* aFrame)
     111                 : {
     112               0 :   NS_PRECONDITION(nsLayoutUtils::GetAsBlock(aFrame) != nsnull,
     113                 :                   "expected a block frame");
     114                 : 
     115               0 :   nsIFrame* f = aFrame;
     116               0 :   while (f && f->GetStyleContext()->GetPseudo()) {
     117               0 :     f = f->GetParent();
     118                 :   }
     119               0 :   return !f || f->GetStyleDisplay()->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE;
     120                 : }
     121                 : 
     122                 : static nsDisplayItem*
     123               0 : ClipMarker(nsDisplayListBuilder* aBuilder,
     124                 :            nsIFrame*             aFrame,
     125                 :            nsDisplayItem*        aMarker,
     126                 :            const nsRect&         aContentArea,
     127                 :            nsRect*               aMarkerRect)
     128                 : {
     129               0 :   nsDisplayItem* item = aMarker;
     130               0 :   nscoord rightOverflow = aMarkerRect->XMost() - aContentArea.XMost();
     131               0 :   if (rightOverflow > 0) {
     132                 :     // Marker overflows on the right side (content width < marker width).
     133               0 :     aMarkerRect->width -= rightOverflow;
     134                 :     item = new (aBuilder)
     135               0 :       nsDisplayClip(aBuilder, aFrame, aMarker, *aMarkerRect);
     136                 :   } else {
     137               0 :     nscoord leftOverflow = aContentArea.x - aMarkerRect->x;
     138               0 :     if (leftOverflow > 0) {
     139                 :       // Marker overflows on the left side
     140               0 :       aMarkerRect->width -= leftOverflow;
     141               0 :       aMarkerRect->x += leftOverflow;
     142                 :       item = new (aBuilder)
     143               0 :         nsDisplayClip(aBuilder, aFrame, aMarker, *aMarkerRect);
     144                 :     }
     145                 :   }
     146               0 :   return item;
     147                 : }
     148                 : 
     149                 : static void
     150               0 : InflateLeft(nsRect* aRect, nscoord aDelta)
     151                 : {
     152               0 :   nscoord xmost = aRect->XMost();
     153               0 :   aRect->x -= aDelta;
     154               0 :   aRect->width = NS_MAX(xmost - aRect->x, 0);
     155               0 : }
     156                 : 
     157                 : static void
     158               0 : InflateRight(nsRect* aRect, nscoord aDelta)
     159                 : {
     160               0 :   aRect->width = NS_MAX(aRect->width + aDelta, 0);
     161               0 : }
     162                 : 
     163                 : static bool
     164               0 : IsFrameDescendantOfAny(nsIFrame* aChild,
     165                 :                        const TextOverflow::FrameHashtable& aSetOfFrames,
     166                 :                        nsIFrame* aCommonAncestor)
     167                 : {
     168               0 :   for (nsIFrame* f = aChild; f && f != aCommonAncestor;
     169                 :        f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
     170               0 :     if (aSetOfFrames.GetEntry(f)) {
     171               0 :       return true;
     172                 :     }
     173                 :   }
     174               0 :   return false;
     175                 : }
     176                 : 
     177                 : class nsDisplayTextOverflowMarker : public nsDisplayItem
     178                 : {
     179                 : public:
     180               0 :   nsDisplayTextOverflowMarker(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
     181                 :                               const nsRect& aRect, nscoord aAscent,
     182                 :                               const nsString& aString,
     183                 :                               PRUint32 aIndex)
     184                 :     : nsDisplayItem(aBuilder, aFrame), mRect(aRect), mString(aString),
     185               0 :       mAscent(aAscent), mIndex(aIndex) {
     186               0 :     MOZ_COUNT_CTOR(nsDisplayTextOverflowMarker);
     187               0 :   }
     188                 : #ifdef NS_BUILD_REFCNT_LOGGING
     189               0 :   virtual ~nsDisplayTextOverflowMarker() {
     190               0 :     MOZ_COUNT_DTOR(nsDisplayTextOverflowMarker);
     191               0 :   }
     192                 : #endif
     193               0 :   virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder) {
     194                 :     nsRect shadowRect =
     195               0 :       nsLayoutUtils::GetTextShadowRectsUnion(mRect, mFrame);
     196               0 :     return mRect.Union(shadowRect);
     197                 :   }
     198                 :   virtual void Paint(nsDisplayListBuilder* aBuilder,
     199                 :                      nsRenderingContext* aCtx);
     200                 : 
     201               0 :   virtual PRUint32 GetPerFrameKey() { 
     202               0 :     return (mIndex << nsDisplayItem::TYPE_BITS) | nsDisplayItem::GetPerFrameKey(); 
     203                 :   }
     204                 :   void PaintTextToContext(nsRenderingContext* aCtx,
     205                 :                           nsPoint aOffsetFromRect);
     206               0 :   NS_DISPLAY_DECL_NAME("TextOverflow", TYPE_TEXT_OVERFLOW)
     207                 : private:
     208                 :   nsRect          mRect;   // in reference frame coordinates
     209                 :   const nsString  mString; // the marker text
     210                 :   nscoord         mAscent; // baseline for the marker text in mRect
     211                 :   PRUint32        mIndex;
     212                 : };
     213                 : 
     214                 : static void
     215               0 : PaintTextShadowCallback(nsRenderingContext* aCtx,
     216                 :                         nsPoint aShadowOffset,
     217                 :                         const nscolor& aShadowColor,
     218                 :                         void* aData)
     219                 : {
     220                 :   reinterpret_cast<nsDisplayTextOverflowMarker*>(aData)->
     221               0 :            PaintTextToContext(aCtx, aShadowOffset);
     222               0 : }
     223                 : 
     224                 : void
     225               0 : nsDisplayTextOverflowMarker::Paint(nsDisplayListBuilder* aBuilder,
     226                 :                                    nsRenderingContext*   aCtx)
     227                 : {
     228                 :   nscolor foregroundColor =
     229               0 :     nsLayoutUtils::GetColor(mFrame, eCSSProperty_color);
     230                 : 
     231                 :   // Paint the text-shadows for the overflow marker
     232                 :   nsLayoutUtils::PaintTextShadow(mFrame, aCtx, mRect, mVisibleRect,
     233                 :                                  foregroundColor, PaintTextShadowCallback,
     234               0 :                                  (void*)this);
     235               0 :   aCtx->SetColor(foregroundColor);
     236               0 :   PaintTextToContext(aCtx, nsPoint(0, 0));
     237               0 : }
     238                 : 
     239                 : void
     240               0 : nsDisplayTextOverflowMarker::PaintTextToContext(nsRenderingContext* aCtx,
     241                 :                                                 nsPoint aOffsetFromRect)
     242                 : {
     243               0 :   nsRefPtr<nsFontMetrics> fm;
     244                 :   nsLayoutUtils::GetFontMetricsForFrame(mFrame, getter_AddRefs(fm),
     245               0 :     nsLayoutUtils::FontSizeInflationFor(mFrame, nsLayoutUtils::eNotInReflow));
     246               0 :   aCtx->SetFont(fm);
     247                 :   gfxFloat y = nsLayoutUtils::GetSnappedBaselineY(mFrame, aCtx->ThebesContext(),
     248               0 :                                                   mRect.y, mAscent);
     249               0 :   nsPoint baselinePt(mRect.x, NSToCoordFloor(y));
     250                 :   nsLayoutUtils::DrawString(mFrame, aCtx, mString.get(),
     251               0 :                             mString.Length(), baselinePt + aOffsetFromRect);
     252               0 : }
     253                 : 
     254                 : void
     255               0 : TextOverflow::Init(nsDisplayListBuilder*   aBuilder,
     256                 :                    const nsDisplayListSet& aLists,
     257                 :                    nsIFrame*               aBlockFrame)
     258                 : {
     259               0 :   mBuilder = aBuilder;
     260               0 :   mBlock = aBlockFrame;
     261               0 :   mMarkerList = aLists.PositionedDescendants();
     262               0 :   mContentArea = aBlockFrame->GetContentRectRelativeToSelf();
     263               0 :   mScrollableFrame = nsLayoutUtils::GetScrollableFrameFor(aBlockFrame);
     264               0 :   PRUint8 direction = aBlockFrame->GetStyleVisibility()->mDirection;
     265               0 :   mBlockIsRTL = direction == NS_STYLE_DIRECTION_RTL;
     266               0 :   mAdjustForPixelSnapping = false;
     267                 : #ifdef MOZ_XUL
     268               0 :   if (!mScrollableFrame) {
     269               0 :     nsIAtom* pseudoType = aBlockFrame->GetStyleContext()->GetPseudo();
     270               0 :     if (pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
     271                 :       mScrollableFrame =
     272               0 :         nsLayoutUtils::GetScrollableFrameFor(aBlockFrame->GetParent());
     273                 :       // nsXULScrollFrame::ClampAndSetBounds rounds to nearest pixels
     274                 :       // for RTL blocks (also for overflow:hidden), so we need to move
     275                 :       // the edges 1px outward in ExamineLineFrames to avoid triggering
     276                 :       // a text-overflow marker in this case.
     277               0 :       mAdjustForPixelSnapping = mBlockIsRTL;
     278                 :     }
     279                 :   }
     280                 : #endif
     281               0 :   mCanHaveHorizontalScrollbar = false;
     282               0 :   if (mScrollableFrame) {
     283                 :     mCanHaveHorizontalScrollbar =
     284               0 :       mScrollableFrame->GetScrollbarStyles().mHorizontal != NS_STYLE_OVERFLOW_HIDDEN;
     285               0 :     if (!mAdjustForPixelSnapping) {
     286                 :       // Scrolling to the end position can leave some text still overflowing due
     287                 :       // to pixel snapping behaviour in our scrolling code.
     288               0 :       mAdjustForPixelSnapping = mCanHaveHorizontalScrollbar;
     289                 :     }
     290               0 :     mContentArea.MoveBy(mScrollableFrame->GetScrollPosition());
     291               0 :     nsIFrame* scrollFrame = do_QueryFrame(mScrollableFrame);
     292               0 :     scrollFrame->AddStateBits(NS_SCROLLFRAME_INVALIDATE_CONTENTS_ON_SCROLL);
     293                 :   }
     294               0 :   const nsStyleTextReset* style = aBlockFrame->GetStyleTextReset();
     295               0 :   mLeft.Init(style->mTextOverflow.GetLeft(direction));
     296               0 :   mRight.Init(style->mTextOverflow.GetRight(direction));
     297                 :   // The left/right marker string is setup in ExamineLineFrames when a line
     298                 :   // has overflow on that side.
     299               0 : }
     300                 : 
     301                 : /* static */ TextOverflow*
     302               0 : TextOverflow::WillProcessLines(nsDisplayListBuilder*   aBuilder,
     303                 :                                const nsDisplayListSet& aLists,
     304                 :                                nsIFrame*               aBlockFrame)
     305                 : {
     306               0 :   if (!CanHaveTextOverflow(aBuilder, aBlockFrame)) {
     307               0 :     return nsnull;
     308                 :   }
     309               0 :   nsAutoPtr<TextOverflow> textOverflow(new TextOverflow);
     310               0 :   textOverflow->Init(aBuilder, aLists, aBlockFrame);
     311               0 :   return textOverflow.forget();
     312                 : }
     313                 : 
     314                 : void
     315               0 : TextOverflow::ExamineFrameSubtree(nsIFrame*       aFrame,
     316                 :                                   const nsRect&   aContentArea,
     317                 :                                   const nsRect&   aInsideMarkersArea,
     318                 :                                   FrameHashtable* aFramesToHide,
     319                 :                                   AlignmentEdges* aAlignmentEdges,
     320                 :                                   bool*           aFoundVisibleTextOrAtomic,
     321                 :                                   InnerClipEdges* aClippedMarkerEdges)
     322                 : {
     323               0 :   const nsIAtom* frameType = aFrame->GetType();
     324               0 :   if (frameType == nsGkAtoms::brFrame ||
     325                 :       frameType == nsGkAtoms::placeholderFrame) {
     326               0 :     return;
     327                 :   }
     328               0 :   const bool isAtomic = IsAtomicElement(aFrame, frameType);
     329               0 :   if (aFrame->GetStyleVisibility()->IsVisible()) {
     330               0 :     nsRect childRect = aFrame->GetScrollableOverflowRect() +
     331               0 :                        aFrame->GetOffsetTo(mBlock);
     332               0 :     bool overflowLeft = childRect.x < aContentArea.x;
     333               0 :     bool overflowRight = childRect.XMost() > aContentArea.XMost();
     334               0 :     if (overflowLeft) {
     335               0 :       mLeft.mHasOverflow = true;
     336                 :     }
     337               0 :     if (overflowRight) {
     338               0 :       mRight.mHasOverflow = true;
     339                 :     }
     340               0 :     if (isAtomic && ((mLeft.mActive && overflowLeft) ||
     341                 :                      (mRight.mActive && overflowRight))) {
     342               0 :       aFramesToHide->PutEntry(aFrame);
     343               0 :     } else if (isAtomic || frameType == nsGkAtoms::textFrame) {
     344                 :       AnalyzeMarkerEdges(aFrame, frameType, aInsideMarkersArea,
     345                 :                          aFramesToHide, aAlignmentEdges,
     346                 :                          aFoundVisibleTextOrAtomic,
     347               0 :                          aClippedMarkerEdges);
     348                 :     }
     349                 :   }
     350               0 :   if (isAtomic) {
     351               0 :     return;
     352                 :   }
     353                 : 
     354               0 :   nsIFrame* child = aFrame->GetFirstPrincipalChild();
     355               0 :   while (child) {
     356                 :     ExamineFrameSubtree(child, aContentArea, aInsideMarkersArea,
     357                 :                         aFramesToHide, aAlignmentEdges,
     358                 :                         aFoundVisibleTextOrAtomic,
     359               0 :                         aClippedMarkerEdges);
     360               0 :     child = child->GetNextSibling();
     361                 :   }
     362                 : }
     363                 : 
     364                 : void
     365               0 : TextOverflow::AnalyzeMarkerEdges(nsIFrame*       aFrame,
     366                 :                                  const nsIAtom*  aFrameType,
     367                 :                                  const nsRect&   aInsideMarkersArea,
     368                 :                                  FrameHashtable* aFramesToHide,
     369                 :                                  AlignmentEdges* aAlignmentEdges,
     370                 :                                  bool*           aFoundVisibleTextOrAtomic,
     371                 :                                  InnerClipEdges* aClippedMarkerEdges)
     372                 : {
     373               0 :   nsRect borderRect(aFrame->GetOffsetTo(mBlock), aFrame->GetSize());
     374                 :   nscoord leftOverlap =
     375               0 :     NS_MAX(aInsideMarkersArea.x - borderRect.x, 0);
     376                 :   nscoord rightOverlap =
     377               0 :     NS_MAX(borderRect.XMost() - aInsideMarkersArea.XMost(), 0);
     378               0 :   bool insideLeftEdge = aInsideMarkersArea.x <= borderRect.XMost();
     379               0 :   bool insideRightEdge = borderRect.x <= aInsideMarkersArea.XMost();
     380                 : 
     381               0 :   if (leftOverlap > 0) {
     382               0 :     aClippedMarkerEdges->AccumulateLeft(borderRect);
     383               0 :     if (!mLeft.mActive) {
     384               0 :       leftOverlap = 0;
     385                 :     }
     386                 :   }
     387               0 :   if (rightOverlap > 0) {
     388               0 :     aClippedMarkerEdges->AccumulateRight(borderRect);
     389               0 :     if (!mRight.mActive) {
     390               0 :       rightOverlap = 0;
     391                 :     }
     392                 :   }
     393                 : 
     394               0 :   if ((leftOverlap > 0 && insideLeftEdge) ||
     395                 :       (rightOverlap > 0 && insideRightEdge)) {
     396               0 :     if (aFrameType == nsGkAtoms::textFrame) {
     397               0 :       if (aInsideMarkersArea.x < aInsideMarkersArea.XMost()) {
     398                 :         // a clipped text frame and there is some room between the markers
     399                 :         nscoord snappedLeft, snappedRight;
     400                 :         bool isFullyClipped =
     401                 :           IsFullyClipped(static_cast<nsTextFrame*>(aFrame),
     402               0 :                          leftOverlap, rightOverlap, &snappedLeft, &snappedRight);
     403               0 :         if (!isFullyClipped) {
     404               0 :           nsRect snappedRect = borderRect;
     405               0 :           if (leftOverlap > 0) {
     406               0 :             snappedRect.x += snappedLeft;
     407               0 :             snappedRect.width -= snappedLeft;
     408                 :           }
     409               0 :           if (rightOverlap > 0) {
     410               0 :             snappedRect.width -= snappedRight;
     411                 :           }
     412               0 :           aAlignmentEdges->Accumulate(snappedRect);
     413               0 :           *aFoundVisibleTextOrAtomic = true;
     414                 :         }
     415                 :       }
     416                 :     } else {
     417               0 :       aFramesToHide->PutEntry(aFrame);
     418               0 :     }
     419               0 :   } else if (!insideLeftEdge || !insideRightEdge) {
     420                 :     // frame is outside
     421               0 :     if (IsAtomicElement(aFrame, aFrameType)) {
     422               0 :       aFramesToHide->PutEntry(aFrame);
     423                 :     }
     424                 :   } else {
     425                 :     // frame is inside
     426               0 :     aAlignmentEdges->Accumulate(borderRect);
     427               0 :     *aFoundVisibleTextOrAtomic = true;
     428                 :   }
     429               0 : }
     430                 : 
     431                 : void
     432               0 : TextOverflow::ExamineLineFrames(nsLineBox*      aLine,
     433                 :                                 FrameHashtable* aFramesToHide,
     434                 :                                 AlignmentEdges* aAlignmentEdges)
     435                 : {
     436                 :   // No ellipsing for 'clip' style.
     437               0 :   bool suppressLeft = mLeft.mStyle->mType == NS_STYLE_TEXT_OVERFLOW_CLIP;
     438               0 :   bool suppressRight = mRight.mStyle->mType == NS_STYLE_TEXT_OVERFLOW_CLIP;
     439               0 :   if (mCanHaveHorizontalScrollbar) {
     440               0 :     nsPoint pos = mScrollableFrame->GetScrollPosition();
     441               0 :     nsRect scrollRange = mScrollableFrame->GetScrollRange();
     442                 :     // No ellipsing when nothing to scroll to on that side (this includes
     443                 :     // overflow:auto that doesn't trigger a horizontal scrollbar).
     444               0 :     if (pos.x <= scrollRange.x) {
     445               0 :       suppressLeft = true;
     446                 :     }
     447               0 :     if (pos.x >= scrollRange.XMost()) {
     448               0 :       suppressRight = true;
     449                 :     }
     450                 :   }
     451                 : 
     452               0 :   nsRect contentArea = mContentArea;
     453                 :   const nscoord scrollAdjust = mAdjustForPixelSnapping ?
     454               0 :     mBlock->PresContext()->AppUnitsPerDevPixel() : 0;
     455               0 :   InflateLeft(&contentArea, scrollAdjust);
     456               0 :   InflateRight(&contentArea, scrollAdjust);
     457               0 :   nsRect lineRect = aLine->GetScrollableOverflowArea();
     458                 :   const bool leftOverflow =
     459               0 :     !suppressLeft && lineRect.x < contentArea.x;
     460                 :   const bool rightOverflow =
     461               0 :     !suppressRight && lineRect.XMost() > contentArea.XMost();
     462               0 :   if (!leftOverflow && !rightOverflow) {
     463                 :     // The line does not overflow on a side we should ellipsize.
     464                 :     return;
     465                 :   }
     466                 : 
     467               0 :   int pass = 0;
     468               0 :   bool retryEmptyLine = true;
     469               0 :   bool guessLeft = leftOverflow;
     470               0 :   bool guessRight = rightOverflow;
     471               0 :   mLeft.mActive = leftOverflow;
     472               0 :   mRight.mActive = rightOverflow;
     473               0 :   bool clippedLeftMarker = false;
     474               0 :   bool clippedRightMarker = false;
     475               0 :   do {
     476                 :     // Setup marker strings as needed.
     477               0 :     if (guessLeft) {
     478               0 :       mLeft.SetupString(mBlock);
     479                 :     }
     480               0 :     if (guessRight) {
     481               0 :       mRight.SetupString(mBlock);
     482                 :     }
     483                 :     
     484                 :     // If there is insufficient space for both markers then keep the one on the
     485                 :     // end side per the block's 'direction'.
     486               0 :     nscoord rightMarkerWidth = mRight.mActive ? mRight.mWidth : 0;
     487               0 :     nscoord leftMarkerWidth = mLeft.mActive ? mLeft.mWidth : 0;
     488               0 :     if (leftMarkerWidth && rightMarkerWidth &&
     489                 :         leftMarkerWidth + rightMarkerWidth > contentArea.width) {
     490               0 :       if (mBlockIsRTL) {
     491               0 :         rightMarkerWidth = 0;
     492                 :       } else {
     493               0 :         leftMarkerWidth = 0;
     494                 :       }
     495                 :     }
     496                 : 
     497                 :     // Calculate the area between the potential markers aligned at the
     498                 :     // block's edge.
     499               0 :     nsRect insideMarkersArea = mContentArea;
     500               0 :     if (guessLeft) {
     501               0 :       InflateLeft(&insideMarkersArea, -leftMarkerWidth);
     502                 :     }
     503               0 :     if (guessRight) {
     504               0 :       InflateRight(&insideMarkersArea, -rightMarkerWidth);
     505                 :     }
     506                 : 
     507                 :     // Analyze the frames on aLine for the overflow situation at the content
     508                 :     // edges and at the edges of the area between the markers.
     509               0 :     bool foundVisibleTextOrAtomic = false;
     510               0 :     PRInt32 n = aLine->GetChildCount();
     511               0 :     nsIFrame* child = aLine->mFirstChild;
     512               0 :     InnerClipEdges clippedMarkerEdges;
     513               0 :     for (; n-- > 0; child = child->GetNextSibling()) {
     514                 :       ExamineFrameSubtree(child, contentArea, insideMarkersArea,
     515                 :                           aFramesToHide, aAlignmentEdges,
     516                 :                           &foundVisibleTextOrAtomic,
     517               0 :                           &clippedMarkerEdges);
     518                 :     }
     519               0 :     if (!foundVisibleTextOrAtomic && retryEmptyLine) {
     520               0 :       aAlignmentEdges->mAssigned = false;
     521               0 :       aFramesToHide->Clear();
     522               0 :       pass = -1;
     523               0 :       if (mLeft.IsNeeded() && mLeft.mActive && !clippedLeftMarker) {
     524               0 :         if (clippedMarkerEdges.mAssignedLeft &&
     525               0 :             clippedMarkerEdges.mLeft - mContentArea.X() > 0) {
     526               0 :           mLeft.mWidth = clippedMarkerEdges.mLeft - mContentArea.X();
     527               0 :           NS_ASSERTION(mLeft.mWidth < mLeft.mIntrinsicWidth,
     528                 :                        "clipping a marker should make it strictly smaller");
     529               0 :           clippedLeftMarker = true;
     530                 :         } else {
     531               0 :           mLeft.mActive = guessLeft = false;
     532                 :         }
     533               0 :         continue;
     534                 :       }
     535               0 :       if (mRight.IsNeeded() && mRight.mActive && !clippedRightMarker) {
     536               0 :         if (clippedMarkerEdges.mAssignedRight &&
     537               0 :             mContentArea.XMost() - clippedMarkerEdges.mRight > 0) {
     538               0 :           mRight.mWidth = mContentArea.XMost() - clippedMarkerEdges.mRight;
     539               0 :           NS_ASSERTION(mRight.mWidth < mRight.mIntrinsicWidth,
     540                 :                        "clipping a marker should make it strictly smaller");
     541               0 :           clippedRightMarker = true;
     542                 :         } else {
     543               0 :           mRight.mActive = guessRight = false;
     544                 :         }
     545               0 :         continue;
     546                 :       }
     547                 :       // The line simply has no visible content even without markers,
     548                 :       // so examine the line again without suppressing markers.
     549               0 :       retryEmptyLine = false;
     550               0 :       mLeft.mWidth = mLeft.mIntrinsicWidth;
     551               0 :       mLeft.mActive = guessLeft = leftOverflow;
     552               0 :       mRight.mWidth = mRight.mIntrinsicWidth;
     553               0 :       mRight.mActive = guessRight = rightOverflow;
     554               0 :       continue;
     555                 :     }
     556               0 :     if (guessLeft == (mLeft.mActive && mLeft.IsNeeded()) &&
     557               0 :         guessRight == (mRight.mActive && mRight.IsNeeded())) {
     558                 :       break;
     559                 :     } else {
     560               0 :       guessLeft = mLeft.mActive && mLeft.IsNeeded();
     561               0 :       guessRight = mRight.mActive && mRight.IsNeeded();
     562               0 :       mLeft.Reset();
     563               0 :       mRight.Reset();
     564               0 :       aFramesToHide->Clear();
     565                 :     }
     566               0 :     NS_ASSERTION(pass == 0, "2nd pass should never guess wrong");
     567                 :   } while (++pass != 2);
     568               0 :   if (!leftOverflow || !mLeft.mActive) {
     569               0 :     mLeft.Reset();
     570                 :   }
     571               0 :   if (!rightOverflow || !mRight.mActive) {
     572               0 :     mRight.Reset();
     573                 :   }
     574                 : }
     575                 : 
     576                 : void
     577               0 : TextOverflow::ProcessLine(const nsDisplayListSet& aLists,
     578                 :                           nsLineBox*              aLine)
     579                 : {
     580               0 :   NS_ASSERTION(mLeft.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP ||
     581                 :                mRight.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP,
     582                 :                "TextOverflow with 'clip' for both sides");
     583               0 :   mLeft.Reset();
     584               0 :   mLeft.mActive = mLeft.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP;
     585               0 :   mRight.Reset();
     586               0 :   mRight.mActive = mRight.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP;
     587                 :   
     588               0 :   FrameHashtable framesToHide;
     589               0 :   if (!framesToHide.Init(100)) {
     590                 :     return;
     591                 :   }
     592               0 :   AlignmentEdges alignmentEdges;
     593               0 :   ExamineLineFrames(aLine, &framesToHide, &alignmentEdges);
     594               0 :   bool needLeft = mLeft.IsNeeded();
     595               0 :   bool needRight = mRight.IsNeeded();
     596               0 :   if (!needLeft && !needRight) {
     597                 :     return;
     598                 :   }
     599               0 :   NS_ASSERTION(mLeft.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP ||
     600                 :                !needLeft, "left marker for 'clip'");
     601               0 :   NS_ASSERTION(mRight.mStyle->mType != NS_STYLE_TEXT_OVERFLOW_CLIP ||
     602                 :                !needRight, "right marker for 'clip'");
     603                 : 
     604                 :   // If there is insufficient space for both markers then keep the one on the
     605                 :   // end side per the block's 'direction'.
     606               0 :   if (needLeft && needRight &&
     607                 :       mLeft.mWidth + mRight.mWidth > mContentArea.width) {
     608               0 :     if (mBlockIsRTL) {
     609               0 :       needRight = false;
     610                 :     } else {
     611               0 :       needLeft = false;
     612                 :     }
     613                 :   }
     614               0 :   nsRect insideMarkersArea = mContentArea;
     615               0 :   if (needLeft) {
     616               0 :     InflateLeft(&insideMarkersArea, -mLeft.mWidth);
     617                 :   }
     618               0 :   if (needRight) {
     619               0 :     InflateRight(&insideMarkersArea, -mRight.mWidth);
     620                 :   }
     621               0 :   if (!mCanHaveHorizontalScrollbar && alignmentEdges.mAssigned) {
     622                 :     nsRect alignmentRect = nsRect(alignmentEdges.x, insideMarkersArea.y,
     623               0 :                                   alignmentEdges.Width(), 1);
     624               0 :     insideMarkersArea.IntersectRect(insideMarkersArea, alignmentRect);
     625                 :   }
     626                 : 
     627                 :   // Clip and remove display items as needed at the final marker edges.
     628               0 :   nsDisplayList* lists[] = { aLists.Content(), aLists.PositionedDescendants() };
     629               0 :   for (PRUint32 i = 0; i < ArrayLength(lists); ++i) {
     630               0 :     PruneDisplayListContents(lists[i], framesToHide, insideMarkersArea);
     631                 :   }
     632               0 :   CreateMarkers(aLine, needLeft, needRight, insideMarkersArea);
     633                 : }
     634                 : 
     635                 : void
     636               0 : TextOverflow::PruneDisplayListContents(nsDisplayList*        aList,
     637                 :                                        const FrameHashtable& aFramesToHide,
     638                 :                                        const nsRect&         aInsideMarkersArea)
     639                 : {
     640               0 :   nsDisplayList saved;
     641                 :   nsDisplayItem* item;
     642               0 :   while ((item = aList->RemoveBottom())) {
     643               0 :     nsIFrame* itemFrame = item->GetUnderlyingFrame();
     644               0 :     if (itemFrame && IsFrameDescendantOfAny(itemFrame, aFramesToHide, mBlock)) {
     645               0 :       item->~nsDisplayItem();
     646               0 :       continue;
     647                 :     }
     648                 : 
     649               0 :     nsDisplayList* wrapper = item->GetList();
     650               0 :     if (wrapper) {
     651               0 :       if (!itemFrame || GetSelfOrNearestBlock(itemFrame) == mBlock) {
     652               0 :         PruneDisplayListContents(wrapper, aFramesToHide, aInsideMarkersArea);
     653                 :       }
     654                 :     }
     655                 : 
     656                 :     nsCharClipDisplayItem* charClip = itemFrame ? 
     657               0 :       nsCharClipDisplayItem::CheckCast(item) : nsnull;
     658               0 :     if (charClip && GetSelfOrNearestBlock(itemFrame) == mBlock) {
     659               0 :       nsRect rect = itemFrame->GetScrollableOverflowRect() +
     660               0 :                     itemFrame->GetOffsetTo(mBlock);
     661               0 :       if (mLeft.IsNeeded() && rect.x < aInsideMarkersArea.x) {
     662               0 :         nscoord left = aInsideMarkersArea.x - rect.x;
     663               0 :         if (NS_UNLIKELY(left < 0)) {
     664               0 :           item->~nsDisplayItem();
     665               0 :           continue;
     666                 :         }
     667               0 :         charClip->mLeftEdge = left;
     668                 :       }
     669               0 :       if (mRight.IsNeeded() && rect.XMost() > aInsideMarkersArea.XMost()) {
     670               0 :         nscoord right = rect.XMost() - aInsideMarkersArea.XMost();
     671               0 :         if (NS_UNLIKELY(right < 0)) {
     672               0 :           item->~nsDisplayItem();
     673               0 :           continue;
     674                 :         }
     675               0 :         charClip->mRightEdge = right;
     676                 :       }
     677                 :     }
     678                 : 
     679               0 :     saved.AppendToTop(item);
     680                 :   }
     681               0 :   aList->AppendToTop(&saved);
     682               0 : }
     683                 : 
     684                 : /* static */ bool
     685               0 : TextOverflow::CanHaveTextOverflow(nsDisplayListBuilder* aBuilder,
     686                 :                                   nsIFrame*             aBlockFrame)
     687                 : {
     688               0 :   const nsStyleTextReset* style = aBlockFrame->GetStyleTextReset();
     689                 :   // Nothing to do for text-overflow:clip or if 'overflow-x:visible'
     690                 :   // or if we're just building items for event processing.
     691               0 :   if ((style->mTextOverflow.mLeft.mType == NS_STYLE_TEXT_OVERFLOW_CLIP &&
     692                 :        style->mTextOverflow.mRight.mType == NS_STYLE_TEXT_OVERFLOW_CLIP) ||
     693               0 :       IsHorizontalOverflowVisible(aBlockFrame) ||
     694               0 :       aBuilder->IsForEventDelivery()) {
     695               0 :     return false;
     696                 :   }
     697                 : 
     698                 :   // Inhibit the markers if a descendant content owns the caret.
     699               0 :   nsRefPtr<nsCaret> caret = aBlockFrame->PresContext()->PresShell()->GetCaret();
     700               0 :   bool visible = false;
     701               0 :   if (caret && NS_SUCCEEDED(caret->GetCaretVisible(&visible)) && visible) {
     702               0 :     nsCOMPtr<nsISelection> domSelection = caret->GetCaretDOMSelection();
     703               0 :     if (domSelection) {
     704               0 :       nsCOMPtr<nsIDOMNode> node;
     705               0 :       domSelection->GetFocusNode(getter_AddRefs(node));
     706               0 :       nsCOMPtr<nsIContent> content = do_QueryInterface(node);
     707               0 :       if (content && nsContentUtils::ContentIsDescendantOf(content,
     708               0 :                        aBlockFrame->GetContent())) {
     709               0 :         return false;
     710                 :       }
     711                 :     }
     712                 :   }
     713               0 :   return true;
     714                 : }
     715                 : 
     716                 : void
     717               0 : TextOverflow::CreateMarkers(const nsLineBox* aLine,
     718                 :                             bool             aCreateLeft,
     719                 :                             bool             aCreateRight,
     720                 :                             const nsRect&    aInsideMarkersArea) const
     721                 : {
     722               0 :   if (aCreateLeft) {
     723                 :     nsRect markerRect = nsRect(aInsideMarkersArea.x - mLeft.mIntrinsicWidth,
     724                 :                                aLine->mBounds.y,
     725               0 :                                mLeft.mIntrinsicWidth, aLine->mBounds.height);
     726               0 :     markerRect += mBuilder->ToReferenceFrame(mBlock);
     727                 :     nsDisplayItem* marker = new (mBuilder)
     728                 :       nsDisplayTextOverflowMarker(mBuilder, mBlock, markerRect,
     729               0 :                                   aLine->GetAscent(), mLeft.mMarkerString, 0);
     730               0 :     if (marker) {
     731                 :       marker = ClipMarker(mBuilder, mBlock, marker,
     732               0 :                           mContentArea + mBuilder->ToReferenceFrame(mBlock),
     733               0 :                           &markerRect);
     734                 :     }
     735               0 :     mMarkerList->AppendNewToTop(marker);
     736                 :   }
     737                 : 
     738               0 :   if (aCreateRight) {
     739                 :     nsRect markerRect = nsRect(aInsideMarkersArea.XMost(),
     740                 :                                aLine->mBounds.y,
     741               0 :                                mRight.mIntrinsicWidth, aLine->mBounds.height);
     742               0 :     markerRect += mBuilder->ToReferenceFrame(mBlock);
     743                 :     nsDisplayItem* marker = new (mBuilder)
     744                 :       nsDisplayTextOverflowMarker(mBuilder, mBlock, markerRect,
     745               0 :                                   aLine->GetAscent(), mRight.mMarkerString, 1);
     746               0 :     if (marker) {
     747                 :       marker = ClipMarker(mBuilder, mBlock, marker,
     748               0 :                           mContentArea + mBuilder->ToReferenceFrame(mBlock),
     749               0 :                           &markerRect);
     750                 :     }
     751               0 :     mMarkerList->AppendNewToTop(marker);
     752                 :   }
     753               0 : }
     754                 : 
     755                 : void
     756               0 : TextOverflow::Marker::SetupString(nsIFrame* aFrame)
     757                 : {
     758               0 :   if (mInitialized) {
     759               0 :     return;
     760                 :   }
     761                 :   nsRefPtr<nsRenderingContext> rc =
     762               0 :     aFrame->PresContext()->PresShell()->GetReferenceRenderingContext();
     763               0 :   nsRefPtr<nsFontMetrics> fm;
     764                 :   nsLayoutUtils::GetFontMetricsForFrame(aFrame, getter_AddRefs(fm),
     765               0 :     nsLayoutUtils::FontSizeInflationFor(aFrame, nsLayoutUtils::eNotInReflow));
     766               0 :   rc->SetFont(fm);
     767                 : 
     768                 :   mMarkerString = mStyle->mType == NS_STYLE_TEXT_OVERFLOW_ELLIPSIS ?
     769               0 :                     GetEllipsis(fm) : mStyle->mString;
     770                 :   mWidth = nsLayoutUtils::GetStringWidth(aFrame, rc, mMarkerString.get(),
     771               0 :                                          mMarkerString.Length());
     772               0 :   mIntrinsicWidth = mWidth;
     773               0 :   mInitialized = true;
     774                 : }
     775                 : 
     776                 : }  // namespace css
     777                 : }  // namespace mozilla

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