/** * This file is part of the html renderer for KDE. * * Copyright (C) 2000-2003 Lars Knoll (knoll@kde.org) * (C) 2003-2005 Apple Computer, Inc. * (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public License * along with this library; see the file COPYING.LIB. If not, write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301, USA. * */ #include "rendering/bidi.h" #include "rendering/break_lines.h" #include "rendering/render_block.h" #include "rendering/render_text.h" #include "rendering/render_arena.h" #include "rendering/render_layer.h" #include "rendering/render_canvas.h" #include "xml/dom_docimpl.h" #include "kdebug.h" #include "tqdatetime.h" #include "tqfontmetrics.h" #define BIDI_DEBUG 0 // #define DEBUG_LINEBREAKS // #define DEBUG_LAYOUT // #define PAGE_DEBUG namespace khtml { // an iterator which goes through a BidiParagraph struct BidiIterator { BidiIterator() : par(0), obj(0), pos(0), endOfInline(0) {} BidiIterator(RenderBlock *_par, RenderObject *_obj, unsigned int _pos, bool eoi=false) : par(_par), obj(_obj), pos(_pos), endOfInline(eoi) {} void increment( BidiState &bidi, bool skipInlines=true ); bool atEnd() const; const TQChar ¤t() const; TQChar::Direction direction() const; RenderBlock *par; RenderObject *obj; unsigned int pos; bool endOfInline; }; struct BidiStatus { BidiStatus() : eor(TQChar::DirON), lastStrong(TQChar::DirON), last(TQChar::DirON) {} TQChar::Direction eor; TQChar::Direction lastStrong; TQChar::Direction last; }; struct BidiState { BidiState() : context(0) {} BidiIterator sor; BidiIterator eor; BidiIterator last; BidiIterator current; BidiContext *context; BidiStatus status; }; // Used to track a list of chained bidi runs. static BidiRun* sFirstBidiRun; static BidiRun* sLastBidiRun; static int sBidiRunCount; static BidiRun* sCompactFirstBidiRun; static BidiRun* sCompactLastBidiRun; static int sCompactBidiRunCount; static bool sBuildingCompactRuns; // Midpoint globals. The goal is not to do any allocation when dealing with // these midpoints, so we just keep an array around and never clear it. We track // the number of items and position using the two other variables. static TQMemArray *smidpoints; static uint sNumMidpoints; static uint sCurrMidpoint; static bool betweenMidpoints; static bool isLineEmpty = true; static bool previousLineBrokeAtBR = true; static TQChar::Direction dir; static bool adjustEmbedding; static bool emptyRun = true; static int numSpaces; static void embed( TQChar::Direction d, BidiState &bidi ); static void appendRun( BidiState &bidi ); static int getBPMWidth(int childValue, Length cssUnit) { if (!cssUnit.isVariable()) return (cssUnit.isFixed() ? cssUnit.value() : childValue); return 0; } static int getBorderPaddingMargin(RenderObject* child, bool endOfInline) { RenderStyle* cstyle = child->style(); int result = 0; bool leftSide = (cstyle->direction() == LTR) ? !endOfInline : endOfInline; result += getBPMWidth((leftSide ? child->marginLeft() : child->marginRight()), (leftSide ? cstyle->marginLeft() : cstyle->marginRight())); result += getBPMWidth((leftSide ? child->paddingLeft() : child->paddingRight()), (leftSide ? cstyle->paddingLeft() : cstyle->paddingRight())); result += leftSide ? child->borderLeft() : child->borderRight(); return result; } #ifndef NDEBUG static bool inBidiRunDetach; #endif void BidiRun::detach(RenderArena* renderArena) { #ifndef NDEBUG inBidiRunDetach = true; #endif delete this; #ifndef NDEBUG inBidiRunDetach = false; #endif // Recover the size left there for us by operator delete and free the memory. renderArena->free(*(size_t *)this, this); } void* BidiRun::operator new(size_t sz, RenderArena* renderArena) throw() { return renderArena->allocate(sz); } void BidiRun::operator delete(void* ptr, size_t sz) { assert(inBidiRunDetach); // Stash size where detach can find it. *(size_t*)ptr = sz; } static void deleteBidiRuns(RenderArena* arena) { if (!sFirstBidiRun) return; BidiRun* curr = sFirstBidiRun; while (curr) { BidiRun* s = curr->nextRun; curr->detach(arena); curr = s; } sFirstBidiRun = 0; sLastBidiRun = 0; sBidiRunCount = 0; } // --------------------------------------------------------------------- /* a small helper class used internally to resolve Bidi embedding levels. Each line of text caches the embedding level at the start of the line for faster relayouting */ BidiContext::BidiContext(unsigned char l, TQChar::Direction e, BidiContext *p, bool o) : level(l) , override(o), dir(e) { parent = p; if(p) { p->ref(); basicDir = p->basicDir; } else basicDir = e; count = 0; } BidiContext::~BidiContext() { if(parent) parent->deref(); } void BidiContext::ref() const { count++; } void BidiContext::deref() const { count--; if(count <= 0) delete this; } // --------------------------------------------------------------------- inline bool operator==( const BidiIterator &it1, const BidiIterator &it2 ) { if(it1.pos != it2.pos) return false; if(it1.obj != it2.obj) return false; return true; } inline bool operator!=( const BidiIterator &it1, const BidiIterator &it2 ) { if(it1.pos != it2.pos) return true; if(it1.obj != it2.obj) return true; return false; } // when modifying this function, make sure you check InlineMinMaxIterator::next() as well. static inline RenderObject *Bidinext(RenderObject *par, RenderObject *current, BidiState &bidi, bool skipInlines = true, bool *endOfInline = 0 ) { RenderObject *next = 0; bool oldEndOfInline = endOfInline ? *endOfInline : false; if (oldEndOfInline) *endOfInline = false; while(current != 0) { //kdDebug( 6040 ) << "current = " << current << endl; if (!oldEndOfInline && !current->isFloating() && !current->isReplaced() && !current->isPositioned()) { next = current->firstChild(); if ( next && adjustEmbedding ) { EUnicodeBidi ub = next->style()->unicodeBidi(); if ( ub != UBNormal && !emptyRun ) { EDirection dir = next->style()->direction(); TQChar::Direction d = ( ub == Embed ? ( dir == RTL ? TQChar::DirRLE : TQChar::DirLRE ) : ( dir == RTL ? TQChar::DirRLO : TQChar::DirLRO ) ); embed( d, bidi ); } } } if (!next) { if (!skipInlines && !oldEndOfInline && current->isInlineFlow() && endOfInline) { next = current; *endOfInline = true; break; } while (current && current != par) { next = current->nextSibling(); if (next) break; if ( adjustEmbedding && current->style()->unicodeBidi() != UBNormal && !emptyRun ) { embed( TQChar::DirPDF, bidi ); } current = current->parent(); if (!skipInlines && current && current != par && current->isInlineFlow() && endOfInline) { next = current; *endOfInline = true; break; } } } if (!next) break; if (next->isText() || next->isBR() || next->isFloating() || next->isReplaced() || next->isPositioned() || next->isGlyph() || ((!skipInlines || !next->firstChild()) // Always return EMPTY inlines. && next->isInlineFlow())) break; current = next; } return next; } static RenderObject *first( RenderObject *par, BidiState &bidi, bool skipInlines = true ) { if(!par->firstChild()) return 0; RenderObject *o = par->firstChild(); if (o->isInlineFlow()) { if (skipInlines && o->firstChild()) o = Bidinext( par, o, bidi, skipInlines ); else return o; // Never skip empty inlines. } if (o && !o->isText() && !o->isBR() && !o->isReplaced() && !o->isFloating() && !o->isPositioned() && !o->isGlyph()) o = Bidinext( par, o, bidi, skipInlines ); return o; } inline void BidiIterator::increment (BidiState &bidi, bool skipInlines) { if(!obj) return; if(obj->isText()) { pos++; if(pos >= static_cast(obj)->stringLength()) { obj = Bidinext( par, obj, bidi, skipInlines ); pos = 0; } } else { obj = Bidinext( par, obj, bidi, skipInlines, &endOfInline ); pos = 0; } } inline bool BidiIterator::atEnd() const { if(!obj) return true; return false; } const TQChar &BidiIterator::current() const { static TQChar nonBreakingSpace(0xA0); if (!obj || !obj->isText()) return nonBreakingSpace; RenderText* text = static_cast(obj); if (!text->text()) return nonBreakingSpace; return text->text()[pos]; } inline TQChar::Direction BidiIterator::direction() const { if(!obj || !obj->isText() ) return TQChar::DirON; RenderText *renderTxt = static_cast( obj ); if ( pos >= renderTxt->stringLength() ) return TQChar::DirON; return renderTxt->text()[pos].direction(); } // ------------------------------------------------------------------------------------------------- static void addRun(BidiRun* bidiRun) { if (!sFirstBidiRun) sFirstBidiRun = sLastBidiRun = bidiRun; else { sLastBidiRun->nextRun = bidiRun; sLastBidiRun = bidiRun; } sBidiRunCount++; bidiRun->compact = sBuildingCompactRuns; // Compute the number of spaces in this run, if (bidiRun->obj && bidiRun->obj->isText()) { RenderText* text = static_cast(bidiRun->obj); if (text->text()) { for (int i = bidiRun->start; i < bidiRun->stop; i++) { const TQChar c = text->text()[i]; if (c.category() == TQChar::Separator_Space || c == '\n') numSpaces++; } } } } static void reverseRuns(int start, int end) { if (start >= end) return; assert(start >= 0 && end < sBidiRunCount); // Get the item before the start of the runs to reverse and put it in // |beforeStart|. |curr| should point to the first run to reverse. BidiRun* curr = sFirstBidiRun; BidiRun* beforeStart = 0; int i = 0; while (i < start) { i++; beforeStart = curr; curr = curr->nextRun; } BidiRun* startRun = curr; while (i < end) { i++; curr = curr->nextRun; } BidiRun* endRun = curr; BidiRun* afterEnd = curr->nextRun; i = start; curr = startRun; BidiRun* newNext = afterEnd; while (i <= end) { // Do the reversal. BidiRun* next = curr->nextRun; curr->nextRun = newNext; newNext = curr; curr = next; i++; } // Now hook up beforeStart and afterEnd to the newStart and newEnd. if (beforeStart) beforeStart->nextRun = endRun; else sFirstBidiRun = endRun; startRun->nextRun = afterEnd; if (!afterEnd) sLastBidiRun = startRun; } static void chopMidpointsAt(RenderObject* obj, uint pos) { if (!sNumMidpoints) return; BidiIterator* midpoints = smidpoints->data(); for (uint i = 0; i < sNumMidpoints; i++) { const BidiIterator& point = midpoints[i]; if (point.obj == obj && point.pos == pos) { sNumMidpoints = i; break; } } } static void checkMidpoints(BidiIterator& lBreak, BidiState &bidi) { // Check to see if our last midpoint is a start point beyond the line break. If so, // shave it off the list, and shave off a trailing space if the previous end point isn't // white-space: pre. if (lBreak.obj && sNumMidpoints && sNumMidpoints%2 == 0) { BidiIterator* midpoints = smidpoints->data(); BidiIterator& endpoint = midpoints[sNumMidpoints-2]; const BidiIterator& startpoint = midpoints[sNumMidpoints-1]; BidiIterator currpoint = endpoint; while (!currpoint.atEnd() && currpoint != startpoint && currpoint != lBreak) currpoint.increment( bidi ); if (currpoint == lBreak) { // We hit the line break before the start point. Shave off the start point. sNumMidpoints--; if (!endpoint.obj->style()->preserveWS()) { if (endpoint.obj->isText()) { // Don't shave a character off the endpoint if it was from a soft hyphen. RenderText* textObj = static_cast(endpoint.obj); if (endpoint.pos+1 < textObj->length() && textObj->text()[endpoint.pos+1].unicode() == SOFT_HYPHEN) return; } endpoint.pos--; } } } } static void addMidpoint(const BidiIterator& midpoint) { if (!smidpoints) return; if (smidpoints->size() <= sNumMidpoints) smidpoints->resize(sNumMidpoints+10); BidiIterator* midpoints = smidpoints->data(); midpoints[sNumMidpoints++] = midpoint; } static void appendRunsForObject(int start, int end, RenderObject* obj, BidiState &bidi) { if (start > end || obj->isFloating() || (obj->isPositioned() && !obj->hasStaticX() && !obj->hasStaticY())) return; bool haveNextMidpoint = (smidpoints && sCurrMidpoint < sNumMidpoints); BidiIterator nextMidpoint; if (haveNextMidpoint) nextMidpoint = smidpoints->at(sCurrMidpoint); if (betweenMidpoints) { if (!(haveNextMidpoint && nextMidpoint.obj == obj)) return; // This is a new start point. Stop ignoring objects and // adjust our start. betweenMidpoints = false; start = nextMidpoint.pos; sCurrMidpoint++; if (start < end) return appendRunsForObject(start, end, obj, bidi); } else { if (!smidpoints || !haveNextMidpoint || (obj != nextMidpoint.obj)) { addRun(new (obj->renderArena()) BidiRun(start, end, obj, bidi.context, dir)); return; } // An end midpoint has been encountered within our object. We // need to go ahead and append a run with our endpoint. if (int(nextMidpoint.pos+1) <= end) { betweenMidpoints = true; sCurrMidpoint++; if (nextMidpoint.pos != UINT_MAX) { // UINT_MAX means stop at the object and don't include any of it. addRun(new (obj->renderArena()) BidiRun(start, nextMidpoint.pos+1, obj, bidi.context, dir)); return appendRunsForObject(nextMidpoint.pos+1, end, obj, bidi); } } else addRun(new (obj->renderArena()) BidiRun(start, end, obj, bidi.context, dir)); } } static void appendRun( BidiState &bidi ) { if ( emptyRun ) return; #if BIDI_DEBUG > 1 kdDebug(6041) << "appendRun: dir="<<(int)dir<length(), obj, bidi); start = 0; obj = Bidinext( bidi.sor.par, obj, bidi ); } if (obj) appendRunsForObject(start, bidi.eor.pos+1, obj, bidi); bidi.eor.increment( bidi ); bidi.sor = bidi.eor; dir = TQChar::DirON; bidi.status.eor = TQChar::DirON; adjustEmbedding = b; } static void embed( TQChar::Direction d, BidiState &bidi ) { #if BIDI_DEBUG > 1 qDebug("*** embed dir=%d emptyrun=%d", d, emptyRun ); #endif bool b = adjustEmbedding ; adjustEmbedding = false; if ( d == TQChar::DirPDF ) { BidiContext *c = bidi.context->parent; if (c) { if ( bidi.eor != bidi.last ) { appendRun( bidi ); bidi.eor = bidi.last; } appendRun( bidi ); emptyRun = true; bidi.status.last = bidi.context->dir; bidi.context->deref(); bidi.context = c; if(bidi.context->override) dir = bidi.context->dir; else dir = TQChar::DirON; bidi.status.lastStrong = bidi.context->dir; } } else { TQChar::Direction runDir; if( d == TQChar::DirRLE || d == TQChar::DirRLO ) runDir = TQChar::DirR; else runDir = TQChar::DirL; bool override; if( d == TQChar::DirLRO || d == TQChar::DirRLO ) override = true; else override = false; unsigned char level = bidi.context->level; if ( runDir == TQChar::DirR ) { if(level%2) // we have an odd level level += 2; else level++; } else { if(level%2) // we have an odd level level++; else level += 2; } if(level < 61) { if ( bidi.eor != bidi.last ) { appendRun( bidi ); bidi.eor = bidi.last; } appendRun( bidi ); emptyRun = true; bidi.context = new BidiContext(level, runDir, bidi.context, override); bidi.context->ref(); dir = runDir; bidi.status.last = runDir; bidi.status.lastStrong = runDir; bidi.status.eor = runDir; } } adjustEmbedding = b; } InlineFlowBox* RenderBlock::createLineBoxes(RenderObject* obj) { // See if we have an unconstructed line box for this object that is also // the last item on the line. KHTMLAssert(obj->isInlineFlow() || obj == this); RenderFlow* flow = static_cast(obj); // Get the last box we made for this render object. InlineFlowBox* box = flow->lastLineBox(); // If this box is constructed then it is from a previous line, and we need // to make a new box for our line. If this box is unconstructed but it has // something following it on the line, then we know we have to make a new box // as well. In this situation our inline has actually been split in two on // the same line (this can happen with very fancy language mixtures). if (!box || box->isConstructed() || box->nextOnLine()) { // We need to make a new box for this render object. Once // made, we need to place it at the end of the current line. InlineBox* newBox = obj->createInlineBox(false, obj == this); KHTMLAssert(newBox->isInlineFlowBox()); box = static_cast(newBox); box->setFirstLineStyleBit(m_firstLine); // We have a new box. Append it to the inline box we get by constructing our // parent. If we have hit the block itself, then |box| represents the root // inline box for the line, and it doesn't have to be appended to any parent // inline. if (obj != this) { InlineFlowBox* parentBox = createLineBoxes(obj->parent()); parentBox->addToLine(box); } } return box; } InlineFlowBox* RenderBlock::constructLine(const BidiIterator &/*start*/, const BidiIterator &end) { if (!sFirstBidiRun) return 0; // We had no runs. Don't make a root inline box at all. The line is empty. InlineFlowBox* parentBox = 0; for (BidiRun* r = sFirstBidiRun; r; r = r->nextRun) { // Create a box for our object. r->box = r->obj->createInlineBox(r->obj->isPositioned(), false); // If we have no parent box yet, or if the run is not simply a sibling, // then we need to construct inline boxes as necessary to properly enclose the // run's inline box. if (!parentBox || (parentBox->object() != r->obj->parent())) // Create new inline boxes all the way back to the appropriate insertion point. parentBox = createLineBoxes(r->obj->parent()); // Append the inline box to this line. parentBox->addToLine(r->box); } // We should have a root inline box. It should be unconstructed and // be the last continuation of our line list. KHTMLAssert(lastLineBox() && !lastLineBox()->isConstructed()); // Set bits on our inline flow boxes that indicate which sides should // paint borders/margins/padding. This knowledge will ultimately be used when // we determine the horizontal positions and widths of all the inline boxes on // the line. RenderObject* endObject = 0; bool lastLine = !end.obj; if (end.obj && end.pos == 0) endObject = end.obj; lastLineBox()->determineSpacingForFlowBoxes(lastLine, endObject); // Now mark the line boxes as being constructed. lastLineBox()->setConstructed(); // Return the last line. return lastLineBox(); } void RenderBlock::computeHorizontalPositionsForLine(InlineFlowBox* lineBox, BidiState &bidi) { // First determine our total width. int totWidth = lineBox->getFlowSpacingWidth(); BidiRun* r = 0; for (r = sFirstBidiRun; r; r = r->nextRun) { if (r->obj->isPositioned()) continue; // Positioned objects are only participating to figure out their // correct static x position. They have no effect on the width. if (r->obj->isText()) { r->box->setWidth(static_cast(r->obj)->width(r->start, r->stop-r->start, m_firstLine)); #ifdef DEBUG_LAYOUT kdDebug( 6040 ) << renderName() << " computeHorizontalPositionsForLine() set text box width: " << r->box->width() << endl; #endif } else if (!r->obj->isInlineFlow()) { r->obj->calcWidth(); r->box->setWidth(r->obj->width()); totWidth += r->obj->marginLeft() + r->obj->marginRight(); } totWidth += r->box->width(); } // Armed with the total width of the line (without justification), // we now examine our text-align property in order to determine where to position the // objects horizontally. The total width of the line can be increased if we end up // justifying text. int x = leftOffset(m_height); int availableWidth = lineWidth(m_height); switch(style()->textAlign()) { case LEFT: case KHTML_LEFT: numSpaces = 0; break; case JUSTIFY: if (numSpaces != 0 && !bidi.current.atEnd() && !bidi.current.obj->isBR() ) break; // fall through case TAAUTO: numSpaces = 0; // for right to left fall through to right aligned if (bidi.context->basicDir == TQChar::DirL) break; case RIGHT: case KHTML_RIGHT: x += availableWidth - totWidth; numSpaces = 0; break; case CENTER: case KHTML_CENTER: int xd = (availableWidth - totWidth)/2; x += xd >0 ? xd : 0; numSpaces = 0; break; } if (numSpaces > 0) { for (r = sFirstBidiRun; r; r = r->nextRun) { int spaceAdd = 0; if (numSpaces > 0 && r->obj->isText()) { // get the number of spaces in the run int spaces = 0; for ( int i = r->start; i < r->stop; i++ ) { const TQChar c = static_cast(r->obj)->text()[i]; if (c.category() == TQChar::Separator_Space || c == '\n') spaces++; } KHTMLAssert(spaces <= numSpaces); // Only justify text with white-space: normal. if (r->obj->style()->whiteSpace() == NORMAL) { spaceAdd = (availableWidth - totWidth)*spaces/numSpaces; static_cast(r->box)->setSpaceAdd(spaceAdd); totWidth += spaceAdd; } numSpaces -= spaces; } } } // The widths of all runs are now known. We can now place every inline box (and // compute accurate widths for the inline flow boxes). int rightPos = lineBox->placeBoxesHorizontally(x); if (rightPos > m_overflowWidth) m_overflowWidth = rightPos; // FIXME: Work for rtl overflow also. if (x < 0) m_overflowLeft = kMin(m_overflowLeft, x); #ifdef DEBUG_LAYOUT kdDebug( 6040 ) << renderName() << " computeHorizontalPositionsForLine() m_overflowWidth: " << m_overflowWidth << " m_overflowLeft: " << m_overflowLeft << endl; #endif } void RenderBlock::computeVerticalPositionsForLine(InlineFlowBox* lineBox) { lineBox->verticallyAlignBoxes(m_height); // lineBox->setBlockHeight(m_height); // Check for page-breaks if (canvas()->pagedMode() && !lineBox->afterPageBreak()) // If we get a page-break we might need to redo the line-break if (clearLineOfPageBreaks(lineBox) && hasFloats()) return; // See if the line spilled out. If so set overflow height accordingly. int bottomOfLine = lineBox->bottomOverflow(); if (bottomOfLine > m_height && bottomOfLine > m_overflowHeight) m_overflowHeight = bottomOfLine; bool beforeContent = true; // Now make sure we place replaced render objects correctly. for (BidiRun* r = sFirstBidiRun; r; r = r->nextRun) { // For positioned placeholders, cache the static Y position an object with non-inline display would have. // Either it is unchanged if it comes before any real linebox, or it must clear the current line (already accounted in m_height). // This value will be picked up by position() if relevant. if (r->obj->isPositioned()) r->box->setYPos( beforeContent && r->obj->isBox() ? static_cast(r->obj)->staticY() : m_height ); else if (beforeContent) beforeContent = false; // Position is used to properly position both replaced elements and // to update the static normal flow x/y of positioned elements. r->obj->position(r->box, r->start, r->stop - r->start, r->level%2); } } bool RenderBlock::clearLineOfPageBreaks(InlineFlowBox* lineBox) { bool doPageBreak = false; // Check for physical page-breaks int xpage = crossesPageBreak(lineBox->topOverflow(), lineBox->bottomOverflow()); if (xpage) { #ifdef PAGE_DEBUG kdDebug(6040) << renderName() << " Line crosses to page " << xpage << endl; kdDebug(6040) << renderName() << " at pos " << lineBox->yPos() << " height " << lineBox->height() << endl; #endif doPageBreak = true; // check page-break-inside if (!style()->pageBreakInside()) { if (parent()->canClear(this, PageBreakNormal)) { setNeedsPageClear(true); doPageBreak = false; } #ifdef PAGE_DEBUG else kdDebug(6040) << "Ignoring page-break-inside: avoid" << endl; #endif } // check orphans int orphans = 0; InlineRunBox* box = lineBox->prevLineBox(); while (box && orphans < style()->orphans()) { orphans++; box = box->prevLineBox(); } if (orphans == 0) { setNeedsPageClear(true); doPageBreak = false; } else if (orphans < style()->orphans() ) { #ifdef PAGE_DEBUG kdDebug(6040) << "Orphans: " << orphans << endl; #endif // Orphans is a level 2 page-break rule and can be broken only // if the break is physically required. if (parent()->canClear(this, PageBreakHarder)) { // move block instead setNeedsPageClear(true); doPageBreak = false; } #ifdef PAGE_DEBUG else kdDebug(6040) << "Ignoring violated orphans" << endl; #endif } if (doPageBreak) { int pTop = pageTopAfter(lineBox->yPos()); #ifdef PAGE_DEBUG int oldYPos = lineBox->yPos(); #endif m_height = pTop; lineBox->setAfterPageBreak(true); lineBox->verticallyAlignBoxes(m_height); if (lineBox->yPos() < pTop) { // ### serious crap. render_line is sometimes placing lines too high kdDebug(6040) << "page top overflow by repositioned line" << endl; int heightIncrease = pTop - lineBox->yPos(); m_height = pTop + heightIncrease; lineBox->verticallyAlignBoxes(m_height); } #ifdef PAGE_DEBUG kdDebug(6040) << "Cleared line " << lineBox->yPos() - oldYPos << "px" << endl; #endif setContainsPageBreak(true); } } return doPageBreak; } // collects one line of the paragraph and transforms it to visual order void RenderBlock::bidiReorderLine(const BidiIterator &start, const BidiIterator &end, BidiState &bidi) { if ( start == end ) { if ( start.current() == '\n' ) { m_height += lineHeight( m_firstLine ); } return; } #if BIDI_DEBUG > 1 kdDebug(6041) << "reordering Line from " << start.obj << "/" << start.pos << " to " << end.obj << "/" << end.pos << endl; #endif sFirstBidiRun = 0; sLastBidiRun = 0; sBidiRunCount = 0; // context->ref(); dir = TQChar::DirON; emptyRun = true; numSpaces = 0; bidi.current = start; bidi.last = bidi.current; bool atEnd = false; while( 1 ) { TQChar::Direction dirCurrent; if (atEnd) { //kdDebug(6041) << "atEnd" << endl; BidiContext *c = bidi.context; if ( bidi.current.atEnd()) while ( c->parent ) c = c->parent; dirCurrent = c->dir; } else { dirCurrent = bidi.current.direction(); } #ifndef QT_NO_UNICODETABLES #if BIDI_DEBUG > 1 kdDebug(6041) << "directions: dir=" << (int)dir << " current=" << (int)dirCurrent << " last=" << status.last << " eor=" << status.eor << " lastStrong=" << status.lastStrong << " embedding=" << (int)context->dir << " level =" << (int)context->level << endl; #endif switch(dirCurrent) { // embedding and overrides (X1-X9 in the Bidi specs) case TQChar::DirRLE: case TQChar::DirLRE: case TQChar::DirRLO: case TQChar::DirLRO: case TQChar::DirPDF: embed( dirCurrent, bidi ); break; // strong types case TQChar::DirL: if(dir == TQChar::DirON) dir = TQChar::DirL; switch(bidi.status.last) { case TQChar::DirL: bidi.eor = bidi.current; bidi.status.eor = TQChar::DirL; break; case TQChar::DirR: case TQChar::DirAL: case TQChar::DirEN: case TQChar::DirAN: appendRun( bidi ); break; case TQChar::DirES: case TQChar::DirET: case TQChar::DirCS: case TQChar::DirBN: case TQChar::DirB: case TQChar::DirS: case TQChar::DirWS: case TQChar::DirON: if( bidi.status.eor != TQChar::DirL ) { //last stuff takes embedding dir if(bidi.context->dir == TQChar::DirL || bidi.status.lastStrong == TQChar::DirL) { if ( bidi.status.eor != TQChar::DirEN && bidi.status.eor != TQChar::DirAN && bidi.status.eor != TQChar::DirON ) appendRun( bidi ); dir = TQChar::DirL; bidi.eor = bidi.current; bidi.status.eor = TQChar::DirL; } else { if ( bidi.status.eor == TQChar::DirEN || bidi.status.eor == TQChar::DirAN ) { dir = bidi.status.eor; appendRun( bidi ); } dir = TQChar::DirR; bidi.eor = bidi.last; appendRun( bidi ); dir = TQChar::DirL; bidi.status.eor = TQChar::DirL; } } else { bidi.eor = bidi.current; bidi.status.eor = TQChar::DirL; } default: break; } bidi.status.lastStrong = TQChar::DirL; break; case TQChar::DirAL: case TQChar::DirR: if(dir == TQChar::DirON) dir = TQChar::DirR; switch(bidi.status.last) { case TQChar::DirR: case TQChar::DirAL: bidi.eor = bidi.current; bidi.status.eor = TQChar::DirR; break; case TQChar::DirL: case TQChar::DirEN: case TQChar::DirAN: appendRun( bidi ); dir = TQChar::DirR; bidi.eor = bidi.current; bidi.status.eor = TQChar::DirR; break; case TQChar::DirES: case TQChar::DirET: case TQChar::DirCS: case TQChar::DirBN: case TQChar::DirB: case TQChar::DirS: case TQChar::DirWS: case TQChar::DirON: if( !(bidi.status.eor == TQChar::DirR) && !(bidi.status.eor == TQChar::DirAL) ) { //last stuff takes embedding dir if(bidi.context->dir == TQChar::DirR || bidi.status.lastStrong == TQChar::DirR || bidi.status.lastStrong == TQChar::DirAL) { appendRun( bidi ); dir = TQChar::DirR; bidi.eor = bidi.current; bidi.status.eor = TQChar::DirR; } else { dir = TQChar::DirL; bidi.eor = bidi.last; appendRun( bidi ); dir = TQChar::DirR; bidi.status.eor = TQChar::DirR; } } else { bidi.eor = bidi.current; bidi.status.eor = TQChar::DirR; } default: break; } bidi.status.lastStrong = dirCurrent; break; // weak types: case TQChar::DirNSM: // ### if @sor, set dir to dirSor break; case TQChar::DirEN: if(!(bidi.status.lastStrong == TQChar::DirAL)) { // if last strong was AL change EN to AN if(dir == TQChar::DirON) { dir = TQChar::DirL; } switch(bidi.status.last) { case TQChar::DirET: if ( bidi.status.lastStrong == TQChar::DirR || bidi.status.lastStrong == TQChar::DirAL ) { appendRun( bidi ); dir = TQChar::DirEN; bidi.status.eor = TQChar::DirEN; } // fall through case TQChar::DirEN: case TQChar::DirL: bidi.eor = bidi.current; bidi.status.eor = dirCurrent; break; case TQChar::DirR: case TQChar::DirAL: case TQChar::DirAN: appendRun( bidi ); bidi.status.eor = TQChar::DirEN; dir = TQChar::DirEN; break; case TQChar::DirES: case TQChar::DirCS: if(bidi.status.eor == TQChar::DirEN) { bidi.eor = bidi.current; break; } case TQChar::DirBN: case TQChar::DirB: case TQChar::DirS: case TQChar::DirWS: case TQChar::DirON: if(bidi.status.eor == TQChar::DirR) { // neutrals go to R bidi.eor = bidi.last; appendRun( bidi ); dir = TQChar::DirEN; bidi.status.eor = TQChar::DirEN; } else if( bidi.status.eor == TQChar::DirL || (bidi.status.eor == TQChar::DirEN && bidi.status.lastStrong == TQChar::DirL)) { bidi.eor = bidi.current; bidi.status.eor = dirCurrent; } else { // numbers on both sides, neutrals get right to left direction if(dir != TQChar::DirL) { appendRun( bidi ); bidi.eor = bidi.last; dir = TQChar::DirR; appendRun( bidi ); dir = TQChar::DirEN; bidi.status.eor = TQChar::DirEN; } else { bidi.eor = bidi.current; bidi.status.eor = dirCurrent; } } default: break; } break; } case TQChar::DirAN: dirCurrent = TQChar::DirAN; if(dir == TQChar::DirON) dir = TQChar::DirAN; switch(bidi.status.last) { case TQChar::DirL: case TQChar::DirAN: bidi.eor = bidi.current; bidi.status.eor = TQChar::DirAN; break; case TQChar::DirR: case TQChar::DirAL: case TQChar::DirEN: appendRun( bidi ); dir = TQChar::DirAN; bidi.status.eor = TQChar::DirAN; break; case TQChar::DirCS: if(bidi.status.eor == TQChar::DirAN) { bidi.eor = bidi.current; break; } case TQChar::DirES: case TQChar::DirET: case TQChar::DirBN: case TQChar::DirB: case TQChar::DirS: case TQChar::DirWS: case TQChar::DirON: if(bidi.status.eor == TQChar::DirR) { // neutrals go to R bidi.eor = bidi.last; appendRun( bidi ); dir = TQChar::DirAN; bidi.status.eor = TQChar::DirAN; } else if( bidi.status.eor == TQChar::DirL || (bidi.status.eor == TQChar::DirEN && bidi.status.lastStrong == TQChar::DirL)) { bidi.eor = bidi.current; bidi.status.eor = dirCurrent; } else { // numbers on both sides, neutrals get right to left direction if(dir != TQChar::DirL) { appendRun( bidi ); bidi.eor = bidi.last; dir = TQChar::DirR; appendRun( bidi ); dir = TQChar::DirAN; bidi.status.eor = TQChar::DirAN; } else { bidi.eor = bidi.current; bidi.status.eor = dirCurrent; } } default: break; } break; case TQChar::DirES: case TQChar::DirCS: break; case TQChar::DirET: if(bidi.status.last == TQChar::DirEN) { dirCurrent = TQChar::DirEN; bidi.eor = bidi.current; bidi.status.eor = dirCurrent; break; } break; // boundary neutrals should be ignored case TQChar::DirBN: break; // neutrals case TQChar::DirB: // ### what do we do with newline and paragraph seperators that come to here? break; case TQChar::DirS: // ### implement rule L1 break; case TQChar::DirWS: break; case TQChar::DirON: break; default: break; } //cout << " after: dir=" << // dir << " current=" << dirCurrent << " last=" << status.last << " eor=" << status.eor << " lastStrong=" << status.lastStrong << " embedding=" << context->dir << endl; if(bidi.current.atEnd()) break; // set status.last as needed. switch(dirCurrent) { case TQChar::DirET: case TQChar::DirES: case TQChar::DirCS: case TQChar::DirS: case TQChar::DirWS: case TQChar::DirON: switch(bidi.status.last) { case TQChar::DirL: case TQChar::DirR: case TQChar::DirAL: case TQChar::DirEN: case TQChar::DirAN: bidi.status.last = dirCurrent; break; default: bidi.status.last = TQChar::DirON; } break; case TQChar::DirNSM: case TQChar::DirBN: // ignore these break; case TQChar::DirEN: if ( bidi.status.last == TQChar::DirL ) { break; } // fall through default: bidi.status.last = dirCurrent; } #endif if ( atEnd ) break; bidi.last = bidi.current; if ( emptyRun ) { bidi.sor = bidi.current; bidi.eor = bidi.current; emptyRun = false; } // this causes the operator ++ to open and close embedding levels as needed // for the CSS unicode-bidi property adjustEmbedding = true; bidi.current.increment( bidi ); adjustEmbedding = false; if ( bidi.current == end ) { if ( emptyRun ) break; atEnd = true; } } #if BIDI_DEBUG > 0 kdDebug(6041) << "reached end of line current=" << bidi.current.obj << "/" << bidi.current.pos << ", eor=" << bidi.eor.obj << "/" << bidi.eor.pos << endl; #endif if ( !emptyRun && bidi.sor != bidi.current ) { bidi.eor = bidi.last; appendRun( bidi ); } // reorder line according to run structure... // first find highest and lowest levels uchar levelLow = 128; uchar levelHigh = 0; BidiRun *r = sFirstBidiRun; while ( r ) { if ( r->level > levelHigh ) levelHigh = r->level; if ( r->level < levelLow ) levelLow = r->level; r = r->nextRun; } // implements reordering of the line (L2 according to Bidi spec): // L2. From the highest level found in the text to the lowest odd level on each line, // reverse any contiguous sequence of characters that are at that level or higher. // reversing is only done up to the lowest odd level if( !(levelLow%2) ) levelLow++; #if BIDI_DEBUG > 0 kdDebug(6041) << "lineLow = " << (uint)levelLow << ", lineHigh = " << (uint)levelHigh << endl; kdDebug(6041) << "logical order is:" << endl; for (BidiRun* r2 = sFirstBidiRun; r2; r2 = r2->nextRun) kdDebug(6041) << " " << r2 << " start=" << r2->start << " stop=" << r2->stop << " level=" << (uint)r2->level << endl; #endif int count = sBidiRunCount - 1; // do not reverse for visually ordered web sites if(!style()->visuallyOrdered()) { while(levelHigh >= levelLow) { int i = 0; BidiRun* currRun = sFirstBidiRun; while ( i < count ) { while(i < count && currRun && currRun->level < levelHigh) { i++; currRun = currRun->nextRun; } int start = i; while(i <= count && currRun && currRun->level >= levelHigh) { i++; currRun = currRun->nextRun; } int end = i-1; reverseRuns(start, end); } levelHigh--; } } #if BIDI_DEBUG > 0 kdDebug(6041) << "visual order is:" << endl; for (BidiRun* curr = sFirstBidiRun; curr; curr = curr->nextRun) kdDebug(6041) << " " << curr << endl; #endif } void RenderBlock::layoutInlineChildren(bool relayoutChildren, int breakBeforeLine) { BidiState bidi; m_overflowHeight = 0; invalidateVerticalPositions(); #ifdef DEBUG_LAYOUT TQTime qt; qt.start(); kdDebug( 6040 ) << renderName() << " layoutInlineChildren( " << this <<" )" << endl; #endif #if BIDI_DEBUG > 1 || defined( DEBUG_LINEBREAKS ) kdDebug(6041) << " ------- bidi start " << this << " -------" << endl; #endif m_height = borderTop() + paddingTop(); int toAdd = borderBottom() + paddingBottom(); if (m_layer && scrollsOverflowX() && style()->height().isVariable()) toAdd += m_layer->horizontalScrollbarHeight(); // Clear out our line boxes. deleteInlineBoxes(); // Text truncation only kicks in if your overflow isn't visible and your // text-overflow-mode isn't clip. bool hasTextOverflow = style()->textOverflow() && hasOverflowClip(); // Walk all the lines and delete our ellipsis line boxes if they exist. if (hasTextOverflow) deleteEllipsisLineBoxes(); if (firstChild()) { // layout replaced elements RenderObject *o = first( this, bidi, false ); while ( o ) { if (o->markedForRepaint()) { o->repaintDuringLayout(); o->setMarkedForRepaint(false); } if (o->isReplaced() || o->isFloating() || o->isPositioned()) { // clear the placeHolderBox if (o->isBox()) static_cast(o)->RenderBox::deleteInlineBoxes(); //kdDebug(6041) << "layouting replaced or floating child" << endl; if (relayoutChildren || o->style()->width().isPercent() || o->style()->height().isPercent()) o->setChildNeedsLayout(true, false); if (o->isPositioned()) o->containingBlock()->insertPositionedObject(o); else o->layoutIfNeeded(); } else { o->deleteInlineBoxes(); o->setNeedsLayout(false); } o = Bidinext( this, o, bidi, false ); } BidiContext *startEmbed; if( style()->direction() == LTR ) { startEmbed = new BidiContext( 0, TQChar::DirL ); bidi.status.eor = TQChar::DirL; } else { startEmbed = new BidiContext( 1, TQChar::DirR ); bidi.status.eor = TQChar::DirR; } startEmbed->ref(); bidi.status.lastStrong = TQChar::DirON; bidi.status.last = TQChar::DirON; bidi.context = startEmbed; adjustEmbedding = true; BidiIterator start(this, first(this, bidi), 0); adjustEmbedding = false; BidiIterator end = start; m_firstLine = true; if (!smidpoints) smidpoints = new TQMemArray; sNumMidpoints = 0; sCurrMidpoint = 0; sCompactFirstBidiRun = sCompactLastBidiRun = 0; sCompactBidiRunCount = 0; previousLineBrokeAtBR = true; int lineCount = 0; bool pagebreakHint = false; int oldPos = 0; BidiIterator oldStart; BidiState oldBidi; const bool pagedMode = canvas()->pagedMode(); // while( !end.atEnd() ) { start = end; lineCount++; betweenMidpoints = false; isLineEmpty = true; pagebreakHint = false; if (pagedMode) { oldPos = m_height; oldStart = start; oldBidi = bidi; } if (lineCount == breakBeforeLine) { m_height = pageTopAfter(oldPos); pagebreakHint = true; } redo_linebreak: end = findNextLineBreak(start, bidi); if( start.atEnd() ) break; if (!isLineEmpty) { bidiReorderLine(start, end, bidi); // Now that the runs have been ordered, we create the line boxes. // At the same time we figure out where border/padding/margin should be applied for // inline flow boxes. if (sBidiRunCount) { InlineFlowBox* lineBox = constructLine(start, end); if (lineBox) { if (pagebreakHint) lineBox->setAfterPageBreak(true); // Now we position all of our text runs horizontally. computeHorizontalPositionsForLine(lineBox, bidi); // Now position our text runs vertically. computeVerticalPositionsForLine(lineBox); deleteBidiRuns(renderArena()); if (lineBox->afterPageBreak() && hasFloats() && !pagebreakHint) { start = end = oldStart; bidi = oldBidi; m_height = pageTopAfter(oldPos); deleteLastLineBox(renderArena()); pagebreakHint = true; goto redo_linebreak; } } } if( end == start || (end.obj && end.obj->isBR() && !start.obj->isBR() ) ) { adjustEmbedding = true; end.increment(bidi); adjustEmbedding = false; } else if (end.obj && end.obj->style()->preserveLF() && end.current() == TQChar('\n')) { adjustEmbedding = true; end.increment(bidi); adjustEmbedding = false; } m_firstLine = false; newLine(); } sNumMidpoints = 0; sCurrMidpoint = 0; sCompactFirstBidiRun = sCompactLastBidiRun = 0; sCompactBidiRunCount = 0; } startEmbed->deref(); //embed->deref(); } sNumMidpoints = 0; sCurrMidpoint = 0; // If we violate widows page-breaking rules, we set a hint and relayout. // Note that the widows rule might still be violated afterwards if the lines have become wider if (canvas()->pagedMode() && containsPageBreak() && breakBeforeLine == 0) { int orphans = 0; int widows = 0; // find breaking line InlineRunBox* lineBox = firstLineBox(); while (lineBox) { if (lineBox->isInlineFlowBox()) { InlineFlowBox* flowBox = static_cast(lineBox); if (flowBox->afterPageBreak()) break; } orphans++; lineBox = lineBox->nextLineBox(); } InlineFlowBox* pageBreaker = static_cast(lineBox); if (!pageBreaker) goto no_break; // count widows while (lineBox && widows < style()->widows()) { if (lineBox->hasTextChildren()) widows++; lineBox = lineBox->nextLineBox(); } // Widows rule broken and more orphans left to use if (widows < style()->widows() && orphans > 0) { kdDebug( 6040 ) << "Widows: " << widows << endl; // Check if we have enough orphans after respecting widows count int newOrphans = orphans - (style()->widows() - widows); if (newOrphans < style()->orphans()) { if (parent()->canClear(this,PageBreakHarder)) { // Relayout to remove incorrect page-break setNeedsPageClear(true); setContainsPageBreak(false); layoutInlineChildren(relayoutChildren, -1); return; } } else { // Set hint and try again layoutInlineChildren(relayoutChildren, newOrphans+1); return; } } } no_break: // in case we have a float on the last line, it might not be positioned up to now. // This has to be done before adding in the bottom border/padding, or the float will // include the padding incorrectly. -dwh positionNewFloats(); // Now add in the bottom border/padding. m_height += toAdd; // Always make sure this is at least our height. m_overflowHeight = kMax(m_height, m_overflowHeight); // See if any lines spill out of the block. If so, we need to update our overflow width. checkLinesForOverflow(); // See if we have any lines that spill out of our block. If we do, then we will // possibly need to truncate text. if (hasTextOverflow) checkLinesForTextOverflow(); #if BIDI_DEBUG > 1 kdDebug(6041) << " ------- bidi end " << this << " -------" << endl; #endif //kdDebug() << "RenderBlock::layoutInlineChildren time used " << qt.elapsed() << endl; //kdDebug(6040) << "height = " << m_height <style()->isOriginalDisplayInlineType(); nssx = o->hasStaticX(); if (nssx && !isInlineType && o->isBox()) { static_cast(o)->setStaticX(o->parent()->style()->direction() == LTR ? p->borderLeft()+p->paddingLeft() : p->borderRight()+p->paddingRight()); nssx = false; } // If our original display was an INLINE type, then we can // determine our static y position now. nssy = o->hasStaticY(); if (nssy && o->isBox()) { static_cast(o)->setStaticY(p->height()); nssy = !isInlineType; } if (needToSetStaticX) *needToSetStaticX = nssx; if (needToSetStaticY) *needToSetStaticY = nssy; } BidiIterator RenderBlock::findNextLineBreak(BidiIterator &start, BidiState &bidi) { int width = lineWidth(m_height); int w = 0; int tmpW = 0; #ifdef DEBUG_LINEBREAKS kdDebug(6041) << "findNextLineBreak: line at " << m_height << " line width " << width << endl; kdDebug(6041) << "sol: " << start.obj << " " << start.pos << endl; #endif BidiIterator posStart = start; bool hadPosStart = false; // eliminate spaces at beginning of line // remove leading spaces. Any inline flows we encounter will be empty and should also // be skipped. while (!start.atEnd() && (start.obj->isInlineFlow() || (!start.obj->style()->preserveWS() && !start.obj->isBR() && #ifndef QT_NO_UNICODETABLES ( (start.current().unicode() == (ushort)0x0020) || // ASCII space (start.current().unicode() == (ushort)0x0009) || // ASCII tab (start.current().unicode() == (ushort)0x000A) || // ASCII line feed (start.current().unicode() == (ushort)0x000C) || // ASCII form feed (start.current().unicode() == (ushort)0x200B) || // Zero-width space start.obj->isFloatingOrPositioned() ) #else ( start.current() == ' ' || start.current() == '\n' || start.obj->isFloatingOrPositioned() ) #endif ))) { if( start.obj->isFloatingOrPositioned() ) { RenderObject *o = start.obj; // add to special objects... if (o->isFloating()) { insertFloatingObject(o); positionNewFloats(); width = lineWidth(m_height); } else if (o->isBox() && o->isPositioned()) { if (!hadPosStart) { hadPosStart = true; posStart = start; // end addMidpoint(BidiIterator(0, o, 0)); } else { // start/end addMidpoint(BidiIterator(0, o, 0)); addMidpoint(BidiIterator(0, o, 0)); } setStaticPosition(this, o); } } adjustEmbedding = true; start.increment(bidi, false /*skipInlines*/); adjustEmbedding = false; } if (hadPosStart && !start.atEnd()) addMidpoint(start); if ( start.atEnd() ){ if (hadPosStart) { start = posStart; posStart.increment(bidi); return posStart; } return start; } // This variable says we have encountered an object after which initial whitespace should be ignored (e.g. InlineFlows at the begining of a line). // Either we have nothing to do, if there is no whitespace after the object... or we have to enter the ignoringSpaces state. // This dilemma will be resolved when we have a peek at the next object. bool checkShouldIgnoreInitialWhitespace = false; // This variable is used only if whitespace isn't set to PRE, and it tells us whether // or not we are currently ignoring whitespace. bool ignoringSpaces = false; BidiIterator ignoreStart; // This variable tracks whether the very last character we saw was a space. We use // this to detect when we encounter a second space so we know we have to terminate // a run. bool currentCharacterIsSpace = false; RenderObject* trailingSpaceObject = 0; BidiIterator lBreak = start; InlineMinMaxIterator it(start.par, start.obj, start.endOfInline, false /*skipPositioned*/); InlineMinMaxIterator lastIt = it; int pos = start.pos; bool prevLineBrokeCleanly = previousLineBrokeAtBR; previousLineBrokeAtBR = false; RenderObject* o = it.current; while( o ) { #ifdef DEBUG_LINEBREAKS kdDebug(6041) << "new object "<< o <<" width = " << w <<" tmpw = " << tmpW << endl; #endif if(o->isBR()) { if( w + tmpW <= width ) { lBreak.obj = o; lBreak.pos = 0; lBreak.endOfInline = it.endOfInline; // A
always breaks a line, so don't let the line be collapsed // away. Also, the space at the end of a line with a
does not // get collapsed away. It only does this if the previous line broke // cleanly. Otherwise the
has no effect on whether the line is // empty or not. if (prevLineBrokeCleanly) isLineEmpty = false; trailingSpaceObject = 0; previousLineBrokeAtBR = true; if (!isLineEmpty) { // only check the clear status for non-empty lines. EClear clear = o->style()->clear(); if(clear != CNONE) m_clearStatus = (EClear) (m_clearStatus | clear); } } goto end; } if( o->isFloatingOrPositioned() ) { // add to special objects... if(o->isFloating()) { insertFloatingObject(o); // check if it fits in the current line. // If it does, position it now, otherwise, position // it after moving to next line (in newLine() func) if (o->width()+o->marginLeft()+o->marginRight()+w+tmpW <= width) { positionNewFloats(); width = lineWidth(m_height); } } else if (o->isPositioned()) { bool needToSetStaticX; bool needToSetStaticY; setStaticPosition(this, o, &needToSetStaticX, &needToSetStaticY); // If we're ignoring spaces, we have to stop and include this object and // then start ignoring spaces again. if (needToSetStaticX || needToSetStaticY) { trailingSpaceObject = 0; ignoreStart.obj = o; ignoreStart.pos = 0; if (ignoringSpaces) { addMidpoint(ignoreStart); // Stop ignoring spaces. addMidpoint(ignoreStart); // Start ignoring again. } } } } else if (o->isInlineFlow()) { tmpW += getBorderPaddingMargin(o, it.endOfInline); if (isLineEmpty) isLineEmpty = !tmpW; if (o->isWordBreak()) { // #### shouldn't be an InlineFlow! w += tmpW; tmpW = 0; lBreak.obj = o; lBreak.pos = 0; lBreak.endOfInline = it.endOfInline; } else if (!it.endOfInline) { // this is the beginning of the line (other non-initial inline flows are handled directly when // incrementing the iterator below). We want to skip initial whitespace as much as possible. checkShouldIgnoreInitialWhitespace = true; } } else if ( o->isReplaced() || o->isGlyph() ) { EWhiteSpace currWS = o->style()->whiteSpace(); EWhiteSpace lastWS = lastIt.current->style()->whiteSpace(); // WinIE marquees have different whitespace characteristics by default when viewed from // the outside vs. the inside. Text inside is NOWRAP, and so we altered the marquee's // style to reflect this, but we now have to get back to the original whitespace value // for the marquee when checking for line breaking. if (o->isHTMLMarquee() && o->layer() && o->layer()->marquee()) currWS = o->layer()->marquee()->whiteSpace(); if (lastIt.current->isHTMLMarquee() && lastIt.current->layer() && lastIt.current->layer()->marquee()) lastWS = lastIt.current->layer()->marquee()->whiteSpace(); // Break on replaced elements if either has normal white-space. if (currWS == NORMAL || lastWS == NORMAL) { w += tmpW; tmpW = 0; lBreak.obj = o; lBreak.pos = 0; lBreak.endOfInline = false; } tmpW += o->width()+o->marginLeft()+o->marginRight(); if (ignoringSpaces) { BidiIterator startMid( 0, o, 0 ); addMidpoint(startMid); } isLineEmpty = false; ignoringSpaces = false; currentCharacterIsSpace = false; trailingSpaceObject = 0; if (o->isListMarker() && o->style()->listStylePosition() == OUTSIDE) { checkShouldIgnoreInitialWhitespace = true; } } else if ( o->isText() ) { RenderText *t = static_cast(o); int strlen = t->stringLength(); int len = strlen - pos; TQChar *str = t->text(); const Font *f = t->htmlFont( m_firstLine ); // proportional font, needs a bit more work. int lastSpace = pos; bool autoWrap = o->style()->autoWrap(); bool preserveWS = o->style()->preserveWS(); bool preserveLF = o->style()->preserveLF(); #ifdef APPLE_CHANGES int wordSpacing = o->style()->wordSpacing(); #endif bool nextIsSoftBreakable = false; bool checkBreakWord = autoWrap && (o->style()->wordWrap() == WWBREAKWORD); while(len) { bool previousCharacterIsSpace = currentCharacterIsSpace; bool isSoftBreakable = nextIsSoftBreakable; nextIsSoftBreakable = false; const TQChar c = str[pos]; currentCharacterIsSpace = c == ' '; checkBreakWord &= !w; // only break words when no other breaking opportunity exists earlier // on the line (even within the text object we are currently processing) if (preserveWS || !currentCharacterIsSpace) isLineEmpty = false; // Check for soft hyphens. Go ahead and ignore them. if (c.unicode() == SOFT_HYPHEN && pos > 0) { nextIsSoftBreakable = true; if (!ignoringSpaces) { // Ignore soft hyphens BidiIterator endMid(0, o, pos-1); addMidpoint(endMid); // Add the width up to but not including the hyphen. tmpW += t->width(lastSpace, pos - lastSpace, f); // For wrapping text only, include the hyphen. We need to ensure it will fit // on the line if it shows when we break. if (o->style()->autoWrap()) tmpW += t->width(pos, 1, f); BidiIterator startMid(0, o, pos+1); addMidpoint(startMid); } pos++; len--; lastSpace = pos; // Cheesy hack to prevent adding in widths of the run twice. continue; } #ifdef APPLE_CHANGES // KDE applies wordspacing differently bool applyWordSpacing = false; #endif if (ignoringSpaces) { // We need to stop ignoring spaces, if we encounter a non-space or // a run that doesn't collapse spaces. if (!currentCharacterIsSpace || preserveWS) { // Stop ignoring spaces and begin at this // new point. ignoringSpaces = false; lastSpace = pos; // e.g., "Foo goo", don't add in any of the ignored spaces. BidiIterator startMid ( 0, o, pos ); addMidpoint(startMid); } else { // Just keep ignoring these spaces. pos++; len--; continue; } } const bool isbreakablePosition = (preserveLF && c == '\n') || (autoWrap && (isBreakable( str, pos, strlen ) || isSoftBreakable)); if ( isbreakablePosition || checkBreakWord ) { tmpW += t->width(lastSpace, pos - lastSpace, f); #ifdef APPLE_CHANGES applyWordSpacing = (wordSpacing && currentCharacterIsSpace && !previousCharacterIsSpace && !t->containsOnlyWhitespace(pos+1, strlen-(pos+1))); #endif #ifdef DEBUG_LINEBREAKS kdDebug(6041) << "found space at " << pos << " in string '" << TQString( str, strlen ).latin1() << "' adding " << tmpW << " new width = " << w << endl; #endif if ( autoWrap && w + tmpW > width && w == 0 ) { int fb = nearestFloatBottom(m_height); int newLineWidth = lineWidth(fb); // See if |tmpW| will fit on the new line. As long as it does not, // keep adjusting our float bottom until we find some room. int lastFloatBottom = m_height; while (lastFloatBottom < fb && tmpW > newLineWidth) { lastFloatBottom = fb; fb = nearestFloatBottom(fb); newLineWidth = lineWidth(fb); } if(!w && m_height < fb && width < newLineWidth) { m_height = fb; width = newLineWidth; #ifdef DEBUG_LINEBREAKS kdDebug() << "RenderBlock::findNextLineBreak new position at " << m_height << " newWidth " << width << endl; #endif } } if (autoWrap) { if (w+tmpW > width) { if (checkBreakWord && pos) { lBreak.obj = o; lBreak.pos = pos-1; lBreak.endOfInline = false; } goto end; } else if ( (pos > 1 && str[pos-1].unicode() == SOFT_HYPHEN) ) // Subtract the width of the soft hyphen out since we fit on a line. tmpW -= t->width(pos-1, 1, f); } if( preserveLF && *(str+pos) == '\n' ) { lBreak.obj = o; lBreak.pos = pos; lBreak.endOfInline = false; #ifdef DEBUG_LINEBREAKS kdDebug(6041) << "forced break sol: " << start.obj << " " << start.pos << " end: " << lBreak.obj << " " << lBreak.pos << " width=" << w << endl; #endif return lBreak; } if ( autoWrap && isbreakablePosition ) { w += tmpW; tmpW = 0; lBreak.obj = o; lBreak.pos = pos; lBreak.endOfInline = false; } lastSpace = pos; #ifdef APPLE_CHANGES if (applyWordSpacing) w += wordSpacing; #endif } if (!ignoringSpaces && !preserveWS) { // If we encounter a second space, we need to go ahead and break up this run // and enter a mode where we start collapsing spaces. if (currentCharacterIsSpace && previousCharacterIsSpace) { ignoringSpaces = true; // We just entered a mode where we are ignoring // spaces. Create a midpoint to terminate the run // before the second space. addMidpoint(ignoreStart); lastSpace = pos; } } if (currentCharacterIsSpace && !previousCharacterIsSpace) { ignoreStart.obj = o; ignoreStart.pos = pos; } if (!preserveWS && currentCharacterIsSpace && !ignoringSpaces) trailingSpaceObject = o; else if (preserveWS || !currentCharacterIsSpace) trailingSpaceObject = 0; pos++; len--; } if (!ignoringSpaces) { // We didn't find any space that would be beyond the line |width|. // Lets add to |tmpW| the remaining width since the last space we found. // Before we test this new |tmpW| however, we will have to look ahead to check // if the next object/position can serve as a line breaking opportunity. tmpW += t->width(lastSpace, pos - lastSpace, f); if (checkBreakWord && !w && pos && tmpW > width) { // Avoid doing the costly lookahead for break-word, // since we know we are allowed to break. lBreak.obj = o; lBreak.pos = pos-1; lBreak.endOfInline = false; goto end; } } } else KHTMLAssert( false ); InlineMinMaxIterator savedIt = lastIt; lastIt = it; o = it.next(); // advance the iterator to the next non-inline-flow while (o && o->isInlineFlow() && !o->isWordBreak()) { tmpW += getBorderPaddingMargin(o, it.endOfInline); if (isLineEmpty) isLineEmpty = !tmpW; o = it.next(); } if (checkShouldIgnoreInitialWhitespace) { // Check if we should switch to ignoringSpaces state if (!style()->preserveWS() && it.current && it.current->isText()) { const RenderText* rt = static_cast(it.current); if (rt->stringLength() > 0 && (rt->text()[0].category() == TQChar::Separator_Space || rt->text()[0] == '\n')) { currentCharacterIsSpace = true; ignoringSpaces = true; BidiIterator endMid( 0, lastIt.current, 0 ); addMidpoint(endMid); } } checkShouldIgnoreInitialWhitespace = false; } bool autoWrap = lastIt.current->style()->autoWrap(); bool checkForBreak = autoWrap; if (w && w + tmpW > width && lBreak.obj && !lastIt.current->style()->preserveLF() && !autoWrap) checkForBreak = true; else if (it.current && lastIt.current->isText() && it.current->isText() && !it.current->isBR()) { if (autoWrap || it.current->style()->autoWrap()) { if (currentCharacterIsSpace) checkForBreak = true; else { checkForBreak = false; RenderText* nextText = static_cast(it.current); if (nextText->stringLength() != 0) { TQChar c = nextText->text()[0]; if (c == ' ' || c == '\t' || (c == '\n' && !it.current->style()->preserveLF())) { // If the next item on the line is text, and if we did not end with // a space, then the next text run continues our word (and so it needs to // keep adding to |tmpW|. Just update and continue. checkForBreak = true; } } bool canPlaceOnLine = (w + tmpW <= width) || !autoWrap; if (canPlaceOnLine && checkForBreak) { w += tmpW; tmpW = 0; lBreak.obj = it.current; lBreak.pos = 0; lBreak.endOfInline = it.endOfInline; } } } } if (checkForBreak && (w + tmpW > width)) { //kdDebug() << " too wide w=" << w << " tmpW = " << tmpW << " width = " << width << endl; //kdDebug() << "start=" << start.obj << " current=" << o << endl; // if we have floats, try to get below them. if (currentCharacterIsSpace && !ignoringSpaces && !lastIt.current->style()->preserveWS()) trailingSpaceObject = 0; int fb = nearestFloatBottom(m_height); int newLineWidth = lineWidth(fb); // See if |tmpW| will fit on the new line. As long as it does not, // keep adjusting our float bottom until we find some room. int lastFloatBottom = m_height; while (lastFloatBottom < fb && tmpW > newLineWidth) { lastFloatBottom = fb; fb = nearestFloatBottom(fb); newLineWidth = lineWidth(fb); } if( !w && m_height < fb && width < newLineWidth ) { m_height = fb; width = newLineWidth; #ifdef DEBUG_LINEBREAKS kdDebug() << "RenderBlock::findNextLineBreak new position at " << m_height << " newWidth " << width << endl; #endif } // |width| may have been adjusted because we got shoved down past a float (thus // giving us more room), so we need to retest, and only jump to // the end label if we still don't fit on the line. -dwh if (w + tmpW > width) { it = lastIt; lastIt = savedIt; o = it.current; goto end; } } if (!lastIt.current->isFloatingOrPositioned() && lastIt.current->isReplaced() && lastIt.current->style()->autoWrap()) { // Go ahead and add in tmpW. w += tmpW; tmpW = 0; lBreak.obj = o; lBreak.pos = 0; lBreak.endOfInline = it.endOfInline; } // Clear out our character space bool, since inline
s don't collapse whitespace
        // with adjacent inline normal/nowrap spans.
        if (lastIt.current->style()->preserveWS())
            currentCharacterIsSpace = false;

        pos = 0;
    }

#ifdef DEBUG_LINEBREAKS
    kdDebug( 6041 ) << "end of par, width = " << width << " linewidth = " << w + tmpW << endl;
#endif
    if( w + tmpW <= width || (lastIt.current && !lastIt.current->style()->autoWrap())) {
        lBreak.obj = 0;
        lBreak.pos = 0;
        lBreak.endOfInline = false;
    }

 end:

    if( lBreak == start && !lBreak.obj->isBR() ) {
        // we just add as much as possible
        if ( style()->whiteSpace() == PRE ) {
            // FIXME: Don't really understand this case.
            if(pos != 0) {
                lBreak.obj = o;
                lBreak.pos = pos - 1;
                lBreak.endOfInline = it.endOfInline;
            } else {
                lBreak.obj = lastIt.current;
                lBreak.pos = lastIt.current->isText() ? lastIt.current->length() : 0;
                lBreak.endOfInline = lastIt.endOfInline;
            }
        } else if( lBreak.obj ) {
            if( lastIt.current != o ) {
                // better to break between object boundaries than in the middle of a word
                lBreak.obj = o;
                lBreak.pos = 0;
                lBreak.endOfInline = it.endOfInline;
            } else {
                // Don't ever break in the middle of a word if we can help it.
                // There's no room at all. We just have to be on this line,
                // even though we'll spill out.
                lBreak.obj = o;
                lBreak.pos = pos;
                lBreak.endOfInline = it.endOfInline;
            }
        }
    }

    if (hadPosStart)
        start = posStart;

    // make sure we consume at least one char/object.
    // and avoid returning an InlineFlow
    // (FIXME: turn those wordbreaks into empty text objects - they shouldn't be inline flows!)
    if( lBreak == start || (lBreak.obj && lBreak.obj->isInlineFlow() && !lBreak.obj->isWordBreak())) {
        lBreak.increment(bidi);
    }

#ifdef DEBUG_LINEBREAKS
    kdDebug(6041) << "regular break sol: " << start.obj << " " << start.pos << "   end: " << lBreak.obj << " " << lBreak.pos << "   width=" << w << endl;
#endif

    // Sanity check our midpoints.
    checkMidpoints(lBreak, bidi);

    if (trailingSpaceObject) {
        // This object is either going to be part of the last midpoint, or it is going
        // to be the actual endpoint.  In both cases we just decrease our pos by 1 level to
        // exclude the space, allowing it to - in effect - collapse into the newline.
        if (sNumMidpoints%2==1) {
            BidiIterator* midpoints = smidpoints->data();
            midpoints[sNumMidpoints-1].pos--;
        }
        //else if (lBreak.pos > 0)
        //    lBreak.pos--;
        else if (lBreak.obj == 0 && trailingSpaceObject->isText()) {
            // Add a new end midpoint that stops right at the very end.
            RenderText* text = static_cast(trailingSpaceObject);
            unsigned pos = text->length() >=2 ? text->length() - 2 : UINT_MAX;
            BidiIterator endMid ( 0, trailingSpaceObject, pos );
            addMidpoint(endMid);
        }
    }

    // We might have made lBreak an iterator that points past the end
    // of the object. Do this adjustment to make it point to the start
    // of the next object instead to avoid confusing the rest of the
    // code.
    if (lBreak.pos > 0) {
        lBreak.pos--;
        lBreak.increment(bidi);
    }

    if (lBreak.obj && lBreak.pos >= 2 && lBreak.obj->isText()) {
        // For soft hyphens on line breaks, we have to chop out the midpoints that made us
        // ignore the hyphen so that it will render at the end of the line.
        TQChar c = static_cast(lBreak.obj)->text()[lBreak.pos-1];
        if (c.unicode() == SOFT_HYPHEN)
            chopMidpointsAt(lBreak.obj, lBreak.pos-2);
    }

    return lBreak;
}

void RenderBlock::checkLinesForOverflow()
{
    for (RootInlineBox* curr = static_cast(firstLineBox()); curr; curr = static_cast(curr->nextLineBox())) {
//         m_overflowLeft = min(curr->leftOverflow(), m_overflowLeft);
        m_overflowTop = kMin(curr->topOverflow(), m_overflowTop);
//         m_overflowWidth = max(curr->rightOverflow(), m_overflowWidth);
        m_overflowHeight = kMax(curr->bottomOverflow(), m_overflowHeight);
    }
}

void RenderBlock::deleteEllipsisLineBoxes()
{
    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox())
        curr->clearTruncation();
}

void RenderBlock::checkLinesForTextOverflow()
{
    // Determine the width of the ellipsis using the current font.
    TQChar ellipsis = 0x2026; // FIXME: CSS3 says this is configurable, also need to use 0x002E (FULL STOP) if 0x2026 not renderable
    static TQString ellipsisStr(ellipsis);
    const Font& firstLineFont = style(true)->htmlFont();
    const Font& font = style()->htmlFont();
    int firstLineEllipsisWidth = firstLineFont.width(&ellipsis, 1, 0);
    int ellipsisWidth = (font == firstLineFont) ? firstLineEllipsisWidth : font.width(&ellipsis, 1, 0);

    // For LTR text truncation, we want to get the right edge of our padding box, and then we want to see
    // if the right edge of a line box exceeds that.  For RTL, we use the left edge of the padding box and
    // check the left edge of the line box to see if it is less
    // Include the scrollbar for overflow blocks, which means we want to use "contentWidth()"
    bool ltr = style()->direction() == LTR;
    for (RootInlineBox* curr = firstRootBox(); curr; curr = curr->nextRootBox()) {
        int blockEdge = ltr ? rightOffset(curr->yPos()) : leftOffset(curr->yPos());
        int lineBoxEdge = ltr ? curr->xPos() + curr->width() : curr->xPos();
        if ((ltr && lineBoxEdge > blockEdge) || (!ltr && lineBoxEdge < blockEdge)) {
            // This line spills out of our box in the appropriate direction.  Now we need to see if the line
            // can be truncated.  In order for truncation to be possible, the line must have sufficient space to
            // accommodate our truncation string, and no replaced elements (images, tables) can overlap the ellipsis
            // space.
            int width = curr == firstRootBox() ? firstLineEllipsisWidth : ellipsisWidth;
            if (curr->canAccommodateEllipsis(ltr, blockEdge, lineBoxEdge, width))
                curr->placeEllipsis(ellipsisStr, ltr, blockEdge, width);
        }
    }
}

// For --enable-final
#undef BIDI_DEBUG
#undef DEBUG_LINEBREAKS
#undef DEBUG_LAYOUT

}