/*
This method takes care of colspans.
effWidth is the same as width for cells without colspans. If we have colspans, they get modified.
*/
int AutoTableLayout::calcEffectiveWidth()
{
int tMaxWidth = 0;
unsigned int nEffCols = layoutStruct.size();
int hspacing = table->borderHSpacing();
#ifdef DEBUG_LAYOUT
qDebug("AutoTableLayout::calcEffectiveWidth for %d cols", nEffCols );
#endif
for ( unsigned int i = 0; i < nEffCols; i++ ) {
layoutStruct[i].effWidth = layoutStruct[i].width;
layoutStruct[i].effMinWidth = layoutStruct[i].minWidth;
layoutStruct[i].effMaxWidth = layoutStruct[i].maxWidth;
}
for ( unsigned int i = 0; i < spanCells.size(); i++ ) {
RenderTableCell *cell = spanCells[i];
if ( !cell || cell == (RenderTableCell *)-1 )
break;
int span = cell->colSpan();
Length w = cell->styleOrColWidth();
if ( !w.isRelative() && w.value() == 0 )
w = Length(); // make it Variable
int col = table->colToEffCol( cell->col() );
unsigned int lastCol = col;
int cMinWidth = cell->minWidth() + hspacing;
int cMaxWidth = cell->maxWidth() + hspacing;
int totalPercent = 0;
int minWidth = 0;
int maxWidth = 0;
bool allColsArePercent = true;
bool allColsAreFixed = true;
bool haveVariable = false;
int fixedWidth = 0;
#ifdef DEBUG_LAYOUT
int cSpan = span;
#endif
while ( lastCol < nEffCols && span > 0 ) {
switch( layoutStruct[lastCol].width.type() ) {
case Percent:
totalPercent += layoutStruct[lastCol].width.value();
allColsAreFixed = false;
break;
case Fixed:
if (layoutStruct[lastCol].width.value() > 0) {
fixedWidth += layoutStruct[lastCol].width.value();
allColsArePercent = false;
// IE resets effWidth to Variable here, but this breaks the konqueror about page and seems to be some bad
// legacy behavior anyway. mozilla doesn't do this so I decided we don't either.
break;
}
// fall through
case Variable:
haveVariable = true;
// fall through
default:
// If the column is a percentage width, do not let the spanning cell overwrite the
// width value. This caused a mis-rendering on amazon.com.
// Sample snippet:
// <table border=2 width=100%><
// <tr><td>1</td><td colspan=2>2-3</tr>
// <tr><td>1</td><td colspan=2 width=100%>2-3</td></tr>
// </table>
if (!layoutStruct[lastCol].effWidth.isPercent()) {
layoutStruct[lastCol].effWidth = Length();
allColsArePercent = false;
}
else
totalPercent += layoutStruct[lastCol].effWidth.value();
allColsAreFixed = false;
}
span -= table->spanOfEffCol( lastCol );
minWidth += layoutStruct[lastCol].effMinWidth;
maxWidth += layoutStruct[lastCol].effMaxWidth;
lastCol++;
cMinWidth -= hspacing;
cMaxWidth -= hspacing;
}
#ifdef DEBUG_LAYOUT
qDebug(" colspan cell %p at effCol %d, span %d, type %d, value %d cmin=%d min=%d fixedwidth=%d", cell, col, cSpan, w.type(), w.value(), cMinWidth, minWidth, fixedWidth );
#endif
// adjust table max width if needed
if ( w.isPercent() ) {
if ( totalPercent > w.value() || allColsArePercent ) {
// can't satify this condition, treat as variable
w = Length();
} else {
int spanMax = kMax( maxWidth, cMaxWidth );
#ifdef DEBUG_LAYOUT
qDebug(" adjusting tMaxWidth (%d): spanMax=%d, value=%d, totalPercent=%d", tMaxWidth, spanMax, w.value(), totalPercent );
#endif
tMaxWidth = kMax( tMaxWidth, spanMax * 100 / w.value() );
// all non percent columns in the span get percent values to sum up correctly.
int percentMissing = w.value() - totalPercent;
int totalWidth = 0;
for ( unsigned int pos = col; pos < lastCol; pos++ ) {
if ( !(layoutStruct[pos].width.isPercent() ) )
totalWidth += layoutStruct[pos].effMaxWidth;
}
for ( unsigned int pos = col; pos < lastCol && totalWidth > 0; pos++ ) {
if ( !(layoutStruct[pos].width.isPercent() ) ) {
int percent = percentMissing * layoutStruct[pos].effMaxWidth / totalWidth;
#ifdef DEBUG_LAYOUT
qDebug(" col %d: setting percent value %d effMaxWidth=%d totalWidth=%d", pos, percent, layoutStruct[pos].effMaxWidth, totalWidth );
#endif
totalWidth -= layoutStruct[pos].effMaxWidth;
percentMissing -= percent;
if ( percent > 0 )
layoutStruct[pos].effWidth = Length( percent, Percent );
else
layoutStruct[pos].effWidth = Length();
}
}
}
}
// make sure minWidth and maxWidth of the spanning cell are honoured
if ( cMinWidth > minWidth ) {
if ( allColsAreFixed ) {
#ifdef DEBUG_LAYOUT
qDebug("extending minWidth of cols %d-%d to %dpx currentMin=%d accroding to fixed sum %d", col, lastCol-1, cMinWidth, minWidth, fixedWidth );
#endif
for ( unsigned int pos = col; fixedWidth > 0 && pos < lastCol; pos++ ) {
int w = kMax( int( layoutStruct[pos].effMinWidth ), cMinWidth * layoutStruct[pos].width.value() / fixedWidth );
#ifdef DEBUG_LAYOUT
qDebug(" col %d: min=%d, effMin=%d, new=%d", pos, layoutStruct[pos].effMinWidth, layoutStruct[pos].effMinWidth, w );
#endif
fixedWidth -= layoutStruct[pos].width.value();
cMinWidth -= w;
layoutStruct[pos].effMinWidth = w;
}
} else if ( allColsArePercent ) {
int maxw = maxWidth;
int minw = minWidth;
int cminw = cMinWidth;
for ( unsigned int pos = col; maxw > 0 && pos < lastCol; pos++ ) {
if ( layoutStruct[pos].effWidth.isPercent() && layoutStruct[pos].effWidth.value()>0 && fixedWidth <= cMinWidth) {
int w = layoutStruct[pos].effMinWidth;
w = kMax( w, cminw*layoutStruct[pos].effWidth.value()/totalPercent );
w = kMin(layoutStruct[pos].effMinWidth+(cMinWidth-minw), w);
#ifdef DEBUG_LAYOUT
qDebug(" col %d: min=%d, effMin=%d, new=%d", pos, layoutStruct[pos].effMinWidth, layoutStruct[pos].effMinWidth, w );
#endif
maxw -= layoutStruct[pos].effMaxWidth;
minw -= layoutStruct[pos].effMinWidth;
cMinWidth -= w;
layoutStruct[pos].effMinWidth = w;
}
}
} else {
#ifdef DEBUG_LAYOUT
qDebug("extending minWidth of cols %d-%d to %dpx currentMin=%d", col, lastCol-1, cMinWidth, minWidth );
#endif
int maxw = maxWidth;
int minw = minWidth;
// Give min to variable first, to fixed second, and to others third.
for ( unsigned int pos = col; maxw > 0 && pos < lastCol; pos++ ) {
if ( layoutStruct[pos].width.isFixed() && haveVariable && fixedWidth <= cMinWidth ) {
int w = kMax( int( layoutStruct[pos].effMinWidth ), layoutStruct[pos].width.value() );
fixedWidth -= layoutStruct[pos].width.value();
minw -= layoutStruct[pos].effMinWidth;
#ifdef DEBUG_LAYOUT
qDebug(" col %d: min=%d, effMin=%d, new=%d", pos, layoutStruct[pos].effMinWidth, layoutStruct[pos].effMinWidth, w );
#endif
maxw -= layoutStruct[pos].effMaxWidth;
cMinWidth -= w;
layoutStruct[pos].effMinWidth = w;
}
}
for ( unsigned int pos = col; maxw > 0 && pos < lastCol && minw < cMinWidth; pos++ ) {
if ( !(layoutStruct[pos].width.isFixed() && haveVariable && fixedWidth <= cMinWidth) ) {
int w = kMax( int( layoutStruct[pos].effMinWidth ), cMinWidth * layoutStruct[pos].effMaxWidth / maxw );
w = kMin(layoutStruct[pos].effMinWidth+(cMinWidth-minw), w);
#ifdef DEBUG_LAYOUT
qDebug(" col %d: min=%d, effMin=%d, new=%d", pos, layoutStruct[pos].effMinWidth, layoutStruct[pos].effMinWidth, w );
#endif
maxw -= layoutStruct[pos].effMaxWidth;
minw -= layoutStruct[pos].effMinWidth;
cMinWidth -= w;
layoutStruct[pos].effMinWidth = w;
}
}
}
}
if ( !w.isPercent() ) {
if ( cMaxWidth > maxWidth ) {
#ifdef DEBUG_LAYOUT
qDebug("extending maxWidth of cols %d-%d to %dpx", col, lastCol-1, cMaxWidth );
#endif
for ( unsigned int pos = col; maxWidth > 0 && pos < lastCol; pos++ ) {
int w = kMax( int( layoutStruct[pos].effMaxWidth ), cMaxWidth * layoutStruct[pos].effMaxWidth / maxWidth );
#ifdef DEBUG_LAYOUT
qDebug(" col %d: max=%d, effMax=%d, new=%d", pos, layoutStruct[pos].effMaxWidth, layoutStruct[pos].effMaxWidth, w );
#endif
maxWidth -= layoutStruct[pos].effMaxWidth;
cMaxWidth -= w;
layoutStruct[pos].effMaxWidth = w;
}
}
} else {
for ( unsigned int pos = col; pos < lastCol; pos++ )
layoutStruct[pos].maxWidth = kMax(layoutStruct[pos].maxWidth, int(layoutStruct[pos].minWidth) );
}
}
effWidthDirty = false;
// qDebug("calcEffectiveWidth: tMaxWidth=%d", tMaxWidth );
return tMaxWidth;
}
/* recalculates the full structure needed to do layouting and minmax calculations.
This is usually calculated on the fly, but needs to be done fully when table cells change
dynamically
*/
void AutoTableLayout::recalcColumn( int effCol )
{
Layout &l = layoutStruct[effCol];
RenderObject *child = table->firstChild();
// first we iterate over all rows.
RenderTableCell *fixedContributor = 0;
RenderTableCell *maxContributor = 0;
while ( child ) {
if ( child->isTableSection() ) {
RenderTableSection *section = static_cast<RenderTableSection *>(child);
int numRows = section->numRows();
RenderTableCell *last = 0;
for ( int i = 0; i < numRows; i++ ) {
RenderTableCell *cell = section->cellAt( i, effCol );
if ( cell == (RenderTableCell *)-1 )
continue;
if ( cell && cell->colSpan() == 1 ) {
// A cell originates in this column. Ensure we have
// a min/max width of at least 1px for this column now.
l.minWidth = kMax(int( l.minWidth ), 1);
l.maxWidth = kMax(int( l.maxWidth ), 1);
if ( !cell->minMaxKnown() )
cell->calcMinMaxWidth();
if ( cell->minWidth() > l.minWidth )
l.minWidth = cell->minWidth();
if ( cell->maxWidth() > l.maxWidth ) {
l.maxWidth = cell->maxWidth();
maxContributor = cell;
}
Length w = cell->styleOrColWidth();
w.l.value = kMin( 32767, kMax( 0, w.value() ) );
switch( w.type() ) {
case Fixed:
// ignore width=0
if ( w.value() > 0 && !l.width.isPercent() ) {
int wval = cell->calcBoxWidth(w.value());
if ( l.width.isFixed() ) {
// Nav/IE weirdness
if ((wval > l.width.value()) ||
((l.width.value() == wval) && (maxContributor == cell))) {
l.width.l.value = wval;
fixedContributor = cell;
}
} else {
l.width = Length( wval, Fixed );
fixedContributor = cell;
}
}
break;
case Percent:
hasPercent = true;
if ( w.value() > 0 && (!l.width.isPercent() || w.value() > l.width.value() ) )
l.width = w;
break;
case Relative:
if ( w.isVariable() || (w.isRelative() && w.value() > l.width.value() ) )
l.width = w;
default:
break;
}
} else {
if ( cell && (!effCol || section->cellAt( i, effCol-1 ) != cell) ) {
// This spanning cell originates in this column. Ensure we have
// a min/max width of at least 1px for this column now.
l.minWidth = kMax(int( l.minWidth ), 1);
l.maxWidth = kMax(int( l.maxWidth ), 1);
insertSpanCell( cell );
}
last = cell;
}
}
}
child = child->nextSibling();
}
// Nav/IE weirdness
if ( l.width.isFixed() ) {
if ( table->style()->htmlHacks()
&& (l.maxWidth > l.width.value()) && (fixedContributor != maxContributor)) {
l.width = Length();
fixedContributor = 0;
}
}
l.maxWidth = kMax(l.maxWidth, int(l.minWidth));
#ifdef DEBUG_LAYOUT
qDebug("col %d, final min=%d, max=%d, width=%d(%d)", effCol, l.minWidth, l.maxWidth, l.width.value(), l.width.type() );
#endif
// ### we need to add col elements aswell
}