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tdelibs/tdehtml/rendering/bidi.cpp

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/**
* 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 tdehtml {
// 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 &current() 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<BidiIterator> *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<RenderText *>(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<RenderText*>(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<RenderText *>( 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<RenderText*>(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<RenderText*>(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<<endl;
#endif
bool b = adjustEmbedding;
adjustEmbedding = false;
int start = bidi.sor.pos;
RenderObject *obj = bidi.sor.obj;
while( obj && obj != bidi.eor.obj ) {
appendRunsForObject(start, obj->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
tqDebug("*** 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.
TDEHTMLAssert(obj->isInlineFlow() || obj == this);
RenderFlow* flow = static_cast<RenderFlow*>(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);
TDEHTMLAssert(newBox->isInlineFlowBox());
box = static_cast<InlineFlowBox*>(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.
TDEHTMLAssert(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<RenderText *>(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 TDEHTML_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 TDEHTML_RIGHT:
x += availableWidth - totWidth;
numSpaces = 0;
break;
case CENTER:
case TDEHTML_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<RenderText *>(r->obj)->text()[i];
if (c.category() == TQChar::Separator_Space || c == '\n')
spaces++;
}
TDEHTMLAssert(spaces <= numSpaces);
// Only justify text with white-space: normal.
if (r->obj->style()->whiteSpace() == NORMAL) {
spaceAdd = (availableWidth - totWidth)*spaces/numSpaces;
static_cast<InlineTextBox*>(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<RenderBox*>(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<RenderBox*>(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<BidiIterator>;
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<InlineFlowBox*>(lineBox);
if (flowBox->afterPageBreak()) break;
}
orphans++;
lineBox = lineBox->nextLineBox();
}
InlineFlowBox* pageBreaker = static_cast<InlineFlowBox*>(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 <<endl;
}
static void setStaticPosition( RenderBlock* p, RenderObject *o, bool *needToSetStaticX = 0, bool *needToSetStaticY = 0 )
{
// If our original display wasn't an inline type, then we can
// determine our static x position now.
bool nssx, nssy;
bool isInlineType = o->style()->isOriginalDisplayInlineType();
nssx = o->hasStaticX();
if (nssx && !isInlineType && o->isBox()) {
static_cast<RenderBox*>(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<RenderBox*>(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 <br> always breaks a line, so don't let the line be collapsed
// away. Also, the space at the end of a line with a <br> does not
// get collapsed away. It only does this if the previous line broke
// cleanly. Otherwise the <br> 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<RenderText *>(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
TDEHTMLAssert( 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<RenderText*>(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<RenderText*>(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 <pre>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<RenderText *>(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<RenderText*>(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<tdehtml::RootInlineBox*>(firstLineBox()); curr; curr = static_cast<tdehtml::RootInlineBox*>(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
}
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