/*
** Routines for doing layout of HTML tables
**
** Copyright (C) 1997-2000 D. Richard Hipp
**
** 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; if not, write to the
** Free Software Foundation, Inc., 59 Temple Place - Suite 330,
** Boston, MA 02111-1307, USA.
**
** Author contact information:
** drh@acm.org
** http://www.hwaci.com/drh/
*/
#include <tk.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include "htmltable.h"
/*
** Default values for various table style parameters
*/
#define DFLT_BORDER 0
#define DFLT_CELLSPACING_3D 5
#define DFLT_CELLSPACING_FLAT 0
#define DFLT_CELLPADDING 2
#define DFLT_HSPACE 0
#define DFLT_VSPACE 0
#if INTERFACE
/*
** Set parameter A to the maximum of A and B.
*/
#define SETMAX(A,B) if( (A)<(B) ){ (A) = (B); }
#define MAX(A,B) ((A)<(B)?(B):(A))
#endif
/*
** Return the appropriate cell spacing for the given table.
*/
static int CellSpacing(HtmlWidget *htmlPtr, HtmlElement *pTable){
char *z;
int relief;
int cellSpacing;
z = HtmlMarkupArg(pTable, "cellspacing", 0);
if( z==0 ){
relief = htmlPtr->tableRelief;
if( relief==TK_RELIEF_RAISED || relief==TK_RELIEF_SUNKEN ){
cellSpacing = DFLT_CELLSPACING_3D;
}else{
cellSpacing = DFLT_CELLSPACING_FLAT;
}
}else{
cellSpacing = atoi(z);
}
return cellSpacing;
}
/* Forward declaration */
static HtmlElement *MinMax(HtmlWidget*, HtmlElement *, int *, int *, int);
/* pStart points to a <table>. Compute the number of columns, the
** minimum and maximum size for each column and the overall minimum
** and maximum size for this table and store these value in the
** pStart structure. Return a pointer to the </table> element,
** or to NULL if there is no </table>.
**
** The min and max size for column N (where the leftmost column has
** N==1) is pStart->minW[1] and pStart->maxW[1]. The pStart->minW[0]
** and pStart->maxW[0] entries contain the minimum and maximum widths
** of the whole table, including any cell padding, cell spacing,
** border width and "hspace". The values of pStart->minW[I] for I>=1
** do not contain any cell padding, cell spacing or border width.
** Only pStart->minW[0] contains these extra spaces.
**
** The back references from </table>, </tr>, </td> and </th> back to
** the <table> markup are also filled in. And for each <td> and <th>
** markup, the pTable and pEnd fields are set to their proper values.
*/
static HtmlElement *TableDimensions(
HtmlWidget *htmlPtr, /* The HTML widget */
HtmlElement *pStart, /* The <table> markup */
int lineWidth /* Total widget available to the table */
){
HtmlElement *p; /* Element being processed */
HtmlElement *pNext; /* Next element to process */
int iCol = 0; /* Current column number. 1..N */
int iRow = 0; /* Current row number */
int inRow = 0; /* True if in between <TR> and </TR> */
int i, j; /* Loop counters */
int n; /* Number of columns */
int minW, maxW, requestedW; /* min, max, requested width for a cell */
int noWrap; /* true for NOWRAP cells */
int colspan; /* Column span for the current cell */
int rowspan; /* Row span for the current cell */
char *z; /* Value of a <table> parameter */
int cellSpacing; /* Value of CELLSPACING parameter */
int cellPadding; /* Value of CELLPADDING parameter */
int tbw; /* Width of border around whole table */
int cbw; /* Width of border around one cell */
int hspace; /* Value of HSPACE parameter */
int separation; /* Space between columns */
int margin; /* Space between left margin and 1st col */
int availWidth; /* Part of lineWidth still available */
int maxTableWidth; /* Amount of lineWidth available to table*/
int fromAbove[HTML_MAX_COLUMNS+1]; /* Cell above extends thru this row */
int min0span[HTML_MAX_COLUMNS+1]; /* Min for colspan=0 cells */
int max0span[HTML_MAX_COLUMNS+1]; /* Max for colspan=0 cells */
int reqW[HTML_MAX_COLUMNS+1]; /* Requested width for each column */
/* colMin[A][B] is the absolute minimum width of all columns between
** A+1 and B+1. colMin[B][A] is the requested width of columns between
** A+1 and B+1. This information is used to add in the constraints imposed
** by <TD COLSPAN=N> markup where N>=2.
*/
int colMin[HTML_MAX_COLUMNS+1][HTML_MAX_COLUMNS+1];
# define ColMin(A,B) colMin[(A)-1][(B)-1]
# define ColReq(A,B) colMin[(B)-1][(A)-1]
if( pStart==0 || pStart->base.type!=Html_TABLE ){
TestPoint(0);
return pStart;
}
TRACE_PUSH(HtmlTrace_Table1);
TRACE(HtmlTrace_Table1, ("Starting TableDimensions..\n"));
pStart->table.nCol = 0;
pStart->table.nRow = 0;
z = HtmlMarkupArg(pStart, "border", 0);
if( z && *z==0 ) z = "2";
tbw = pStart->table.borderWidth = z ? atoi(z) : DFLT_BORDER;
cbw = tbw>0;
z = HtmlMarkupArg(pStart, "cellpadding", 0);
cellPadding = z ? atoi(z) : DFLT_CELLPADDING;
cellSpacing = CellSpacing(htmlPtr, pStart);
#ifdef DEBUG
/* The HtmlTrace_Table4 flag causes tables to be draw with borders
** of 2, cellPadding of 5 and cell spacing of 2. This makes the
** table clearly visible. Useful for debugging. */
if( HtmlTraceMask & HtmlTrace_Table4 ){
tbw = pStart->table.borderWidth = 2;
cbw = 1;
cellPadding = 5;
cellSpacing = 2;
pStart->base.style.bgcolor = COLOR_Background;
}
#endif
separation = cellSpacing + 2*(cellPadding + cbw);
margin = tbw + cellSpacing + cbw + cellPadding;
z = HtmlMarkupArg(pStart, "hspace", 0);
hspace = z ? atoi(z) : DFLT_HSPACE;
for(p=pStart->pNext; p && p->base.type!=Html_EndTABLE; p=pNext){
pNext = p->pNext;
switch( p->base.type ){
case Html_EndTD:
case Html_EndTH:
case Html_EndTABLE:
p->ref.pOther = pStart;
TestPoint(0);
break;
case Html_EndTR:
p->ref.pOther = pStart;
inRow = 0;
TestPoint(0);
break;
case Html_TR:
p->ref.pOther = pStart;
iRow++;
pStart->table.nRow++;
iCol = 0;
inRow = 1;
maxTableWidth = availWidth = lineWidth - 2*margin;
TestPoint(0);
break;
case Html_CAPTION:
while( p && p->base.type!=Html_EndTABLE
&& p->base.type!=Html_EndCAPTION ){
p = p->pNext;
TestPoint(0);
}
break;
case Html_TD:
case Html_TH:
if( !inRow ){
/* If the <TR> markup is omitted, insert it. */
HtmlElement *pNew = HtmlAlloc( sizeof(HtmlRef) );
if( pNew==0 ) break;
memset(pNew, 0, sizeof(HtmlRef));
pNew->base = p->base;
pNew->base.pNext = p;
pNew->base.type = Html_TR;
pNew->base.count = 0;
p->base.pPrev->base.pNext = pNew;
p->base.pPrev = pNew;
pNext = pNew;
break;
}
do{
iCol++;
}while( iCol <= pStart->table.nCol && fromAbove[iCol] > iRow );
p->cell.pTable = pStart;
colspan = p->cell.colspan;
if( colspan==0 ){
colspan = 1;
}
if( iCol + colspan - 1 > pStart->table.nCol ){
int nCol = iCol + colspan - 1;
if( nCol > HTML_MAX_COLUMNS ){
nCol = HTML_MAX_COLUMNS;
}
for(i=pStart->table.nCol+1; i<=nCol; i++){
fromAbove[i] = 0;
pStart->table.minW[i] = 0;
pStart->table.maxW[i] = 0;
min0span[i] = 0;
max0span[i] = 0;
reqW[i] = 0;
for(j=1; j<i; j++){
ColMin(j,i) = 0;
ColReq(j,i) = 0;
}
}
pStart->table.nCol = nCol;
}
noWrap = HtmlMarkupArg(p, "nowrap", 0)!=0;
pNext = MinMax(htmlPtr, p, &minW, &maxW, availWidth);
p->cell.pEnd = pNext;
if( (z = HtmlMarkupArg(p, "width", 0))!=0 ){
for(i=0; isdigit(z[i]); i++){}
if( strcmp(z,"*")==0 ){
requestedW = availWidth;
}else if( z[i]==0 ){
requestedW = atoi(z);
}else if( z[i]=='%' ){
/* requestedW = (atoi(z)*availWidth + 99)/100; */
requestedW = (atoi(z)*maxTableWidth + 99)/100;
}
}else{
requestedW = 0;
}
TRACE(HtmlTrace_Table1,
("Row %d Column %d: min=%d max=%d req=%d stop at %s\n",
iRow,iCol,minW,maxW,requestedW, HtmlTokenName(p->cell.pEnd)));
if( noWrap ){
minW = maxW;
}
if( iCol + p->cell.colspan <= HTML_MAX_COLUMNS ){
int min = 0;
if( p->cell.colspan==0 ){
SETMAX( min0span[iCol], minW );
SETMAX( max0span[iCol], maxW );
min = min0span[iCol] + separation;
}else if( colspan==1 ){
SETMAX( pStart->table.minW[iCol], minW );
SETMAX( pStart->table.maxW[iCol], maxW );
SETMAX( reqW[iCol], requestedW );
min = pStart->table.minW[iCol] + separation;
}else{
int n = p->cell.colspan;
SETMAX( ColMin(iCol,iCol+n-1), minW);
SETMAX( ColReq(iCol,iCol+n-1), requestedW);
min = minW + separation;
#if 0
maxW = (maxW + (n - 1)*(1-separation))/n;
for(i=iCol; i<iCol + n && i<HTML_MAX_COLUMNS; i++){
SETMAX( pStart->table.maxW[i], maxW );
}
#endif
}
availWidth -= min;
}
rowspan = p->cell.rowspan;
if( rowspan==0 ){
rowspan = LARGE_NUMBER;
}
if( rowspan>1 ){
for(i=iCol; i<iCol + p->cell.colspan && i<HTML_MAX_COLUMNS; i++){
fromAbove[i] = iRow + rowspan;
}
}
if( p->cell.colspan > 1 ){
iCol += p->cell.colspan - 1;
}else if( p->cell.colspan==0 ){
iCol = HTML_MAX_COLUMNS + 1;
}
break;
}
}
#ifdef DEBUG
if( HtmlTraceMask & HtmlTrace_Table6 ){
char *zSpace = "";
TRACE_INDENT;
for(i=1; i<=pStart->table.nCol; i++){
printf("%s%d:%d..%d",zSpace,i,
pStart->table.minW[i],pStart->table.maxW[i]);
if( reqW[i]>0 ){
printf("(w=%d)",reqW[i]);
}
zSpace = " ";
}
printf("\n");
for(i=1; i<pStart->table.nCol; i++){
for(j=i+1; j<=pStart->table.nCol; j++){
if( ColMin(i,j)>0 ){
TRACE_INDENT;
printf("ColMin(%d,%d) = %d\n", i, j, ColMin(i,j));
}
if( ColReq(i,j)>0 ){
TRACE_INDENT;
printf("ColReq(%d,%d) = %d\n", i, j, ColReq(i,j));
}
}
}
}
#endif
/* Compute the min and max width of each column
*/
for(i=1; i<=pStart->table.nCol; i++){
int sumMin, sumReq, sumMax;
/* Reduce the max[] field to N for columns that have "width=N" */
if( reqW[i]>0 ){
pStart->table.maxW[i] = MAX(pStart->table.minW[i],reqW[i]);
}
/* Expand the width of columns marked with "colspan=0".
*/
if( min0span[i]>0 || max0span[i]>0 ){
int n = pStart->table.nCol - i + 1;
minW = (min0span[i] + (n - 1)*(1-separation))/n;
maxW = (max0span[i] + (n - 1)*(1-separation))/n;
for(j=i; j<=pStart->table.nCol; j++){
SETMAX( pStart->table.minW[j], minW );
SETMAX( pStart->table.maxW[j], maxW );
}
}
/* Expand the minW[] of columns to accomodate "colspan=N" constraints.
** The minW[] is expanded up to the maxW[] first. Then all the maxW[]s
** are expanded in proportion to their sizes. The same thing occurs
** for reqW[]s.
*/
sumReq = reqW[i];
sumMin = pStart->table.minW[i];
sumMax = pStart->table.maxW[i];
for(j=i-1; j>=1; j--){
int cmin, creq;
sumMin += pStart->table.minW[j];
sumMax += pStart->table.maxW[j];
sumReq += reqW[i];
cmin = ColMin(j,i);
if( cmin>sumMin ){
int k;
double scale;
int *tminW = pStart->table.minW;
int *tmaxW = pStart->table.maxW;
if( sumMin<sumMax ){
scale = (double)(cmin - sumMin)/(double)(sumMax - sumMin);
for(k=j; k<=i; k++){
sumMin -= tminW[k];
tminW[k] = (tmaxW[k] - tminW[k])*scale + tminW[k];
sumMin += tminW[k];
}
}else if( sumMin>0 ){
scale = (double)cmin/(double)sumMin;
for(k=j; k<=i; k++){
sumMin -= tminW[k];
tminW[k] = tmaxW[k] = tminW[k]*scale;
sumMin += tminW[k];
}
}else{
int unit = cmin/(i-j+1);
for(k=j; k<=i; k++){
tminW[k] = tmaxW[k] = unit;
sumMin += tminW[k];
}
}
}
creq = ColReq(j,i);
if( creq>sumReq ){
int k;
double scale;
int *tmaxW = pStart->table.maxW;
if( sumReq<sumMax ){
scale = (double)(creq - sumReq)/(double)(sumMax - sumReq);
for(k=j; k<=i; k++){
sumReq -= reqW[k];
reqW[k] = (tmaxW[k] - reqW[k])*scale + reqW[k];
sumReq += reqW[k];
}
}else if( sumReq>0 ){
scale = (double)creq/(double)sumReq;
for(k=j; k<=i; k++){
sumReq -= reqW[k];
reqW[k] = reqW[k]*scale;
sumReq += reqW[k];
}
}else{
int unit = creq/(i-j+1);
for(k=j; k<=i; k++){
reqW[k] = unit;
sumReq += reqW[k];
}
}
}
}
}
#ifdef DEBUG
if( HtmlTraceMask & HtmlTrace_Table6 ){
char *zSpace = "";
TRACE_INDENT;
for(i=1; i<=pStart->table.nCol; i++){
printf("%s%d:%d..%d",zSpace,i,
pStart->table.minW[i],pStart->table.maxW[i]);
if( reqW[i]>0 ){
printf("(w=%d)",reqW[i]);
}
zSpace = " ";
}
printf("\n");
}
#endif
/* Compute the min and max width of the whole table
*/
n = pStart->table.nCol;
requestedW = tbw*2 + (n+1)*cellSpacing + n*2*(cellPadding + cbw);
pStart->table.minW[0] = requestedW;
pStart->table.maxW[0] = requestedW;
for(i=1; i<=pStart->table.nCol; i++){
pStart->table.minW[0] += pStart->table.minW[i];
pStart->table.maxW[0] += pStart->table.maxW[i];
requestedW += MAX(reqW[i], pStart->table.minW[i]);
}
/* Figure out how wide to draw the table */
z = HtmlMarkupArg(pStart, "width", 0);
if( z ){
int len = strlen(z);
int totalWidth;
if( len>0 && z[len-1]=='%' ){
totalWidth = (atoi(z) * lineWidth)/100;
}else{
totalWidth = atoi(z);
}
SETMAX( requestedW, totalWidth );
}
if( lineWidth && (requestedW > lineWidth) ){
TRACE(HtmlTrace_Table5,("RequestedW reduced to lineWidth: %d -> %d\n",
requestedW, lineWidth));
requestedW = lineWidth;
}
if( requestedW > pStart->table.minW[0] ){
float scale;
int *tminW = pStart->table.minW;
int *tmaxW = pStart->table.maxW;
TRACE(HtmlTrace_Table5,
("Expanding table minW from %d to %d. (reqW=%d width=%s)\n",
tminW[0], requestedW, requestedW, z));
if( tmaxW[0] > tminW[0] ){
scale = (double)(requestedW - tminW[0]) / (double)(tmaxW[0] - tminW[0]);
for(i=1; i<=pStart->table.nCol; i++){
tminW[i] += (tmaxW[i] - tminW[i]) * scale;
SETMAX(tmaxW[i], tminW[i]);
}
}else if( tminW[0]>0 ){
scale = requestedW/(double)tminW[0];
for(i=1; i<=pStart->table.nCol; i++){
tminW[i] *= scale;
tmaxW[i] *= scale;
}
}else if( pStart->table.nCol>0 ){
int unit = (requestedW - margin)/pStart->table.nCol - separation;
if( unit<0 ) unit = 0;
for(i=1; i<=pStart->table.nCol; i++){
tminW[i] = tmaxW[i] = unit;
}
}else{
tminW[0] = tmaxW[0] = requestedW;
}
pStart->table.minW[0] = requestedW;
SETMAX( pStart->table.maxW[0], requestedW );
}
#ifdef DEBUG
if( HtmlTraceMask & HtmlTrace_Table5 ){
TRACE_INDENT;
printf("Start with %s and ", HtmlTokenName(pStart));
printf("end with %s\n", HtmlTokenName(p));
TRACE_INDENT;
printf("nCol=%d minWidth=%d maxWidth=%d\n",
pStart->table.nCol, pStart->table.minW[0], pStart->table.maxW[0]);
for(i=1; i<=pStart->table.nCol; i++){
TRACE_INDENT;
printf("Column %d minWidth=%d maxWidth=%d\n",
i, pStart->table.minW[i], pStart->table.maxW[i]);
}
}
#endif
TRACE(HtmlTrace_Table1,
("Result of TableDimensions: min=%d max=%d nCol=%d\n",
pStart->table.minW[0], pStart->table.maxW[0], pStart->table.nCol));
TRACE_POP(HtmlTrace_Table1);
return p;
}
/*
** Given a list of elements, compute the minimum and maximum width needed
** to render the list. Stop the search at the first element seen that is
** in the following set:
**
** <tr> <td> <th> </tr> </td> </th> </table>
**
** Return a pointer to the element that stopped the search, or to NULL
** if we ran out of data.
**
** Sometimes the value returned for both min and max will be larger than
** the true minimum and maximum. This is rare, and only occurs if the
** element string contains figures with flow-around text.
*/
static HtmlElement *MinMax(
HtmlWidget *htmlPtr, /* The Html widget */
HtmlElement *p, /* Start the search here */
int *pMin, /* Return the minimum width here */
int *pMax, /* Return the maximum width here */
int lineWidth /* Total width available */
){
int min = 0; /* Minimum width so far */
int max = 0; /* Maximum width so far */
int indent = 0; /* Amount of indentation (minimum) */
int obstacle = 0; /* Possible obstacles in the margin */
int x1 = 0; /* Length of current line assuming maximum length */
int x2 = 0; /* Length of current line assuming minimum length */
int go = 1; /* Change to 0 to stop the loop */
HtmlElement *pNext; /* Next element in the list */
for(p=p->pNext; go && p; p = pNext){
pNext = p->pNext;
switch( p->base.type ){
case Html_Text:
x1 += p->text.w;
x2 += p->text.w;
if( p->base.style.flags & STY_Preformatted ){
SETMAX( min, x1 );
SETMAX( max, x1 );
}else{
SETMAX( min, x2 );
SETMAX( max, x1 );
}
break;
case Html_Space:
if( p->base.style.flags & STY_Preformatted ){
if( p->base.flags & HTML_NewLine ){
x1 = x2 = indent;
}else{
x1 += p->space.w * p->base.count;
x2 += p->space.w * p->base.count;
}
}else if( p->base.style.flags & STY_NoBreak ){
if( x1>indent ){ x1 += p->space.w; TestPoint(0);}
if( x2>indent ){ x2 += p->space.w; TestPoint(0);}
}else{
if( x1>indent ){ x1 += p->space.w; TestPoint(0);}
x2 = indent;
}
break;
case Html_IMG:
switch( p->image.align ){
case IMAGE_ALIGN_Left:
case IMAGE_ALIGN_Right:
obstacle += p->image.w;
x1 = obstacle + indent;
x2 = indent;
SETMAX( min, x2 );
SETMAX( min, p->image.w );
SETMAX( max, x1 );
break;
default:
x1 += p->image.w;
x2 += p->image.w;
if( p->base.style.flags & STY_Preformatted ){
SETMAX( min, x1 );
SETMAX( max, x1 );
}else{
SETMAX( min, x2 );
SETMAX( max, x1 );
}
break;
}
break;
case Html_TABLE:
/* pNext = TableDimensions(htmlPtr, p, lineWidth-indent); */
pNext = TableDimensions(htmlPtr, p, 0);
x1 = p->table.maxW[0] + indent + obstacle;
x2 = p->table.minW[0] + indent;
SETMAX( max, x1 );
SETMAX( min, x2 );
x1 = indent + obstacle;
x2 = indent;
if( pNext && pNext->base.type==Html_EndTABLE ){
pNext = pNext->pNext;
}
break;
case Html_UL:
case Html_OL:
indent += HTML_INDENT;
x1 = indent + obstacle;
x2 = indent;
break;
case Html_EndUL:
case Html_EndOL:
indent -= HTML_INDENT;
if( indent < 0 ){ indent = 0; }
x1 = indent + obstacle;
x2 = indent;
break;
case Html_BLOCKQUOTE:
indent += 2*HTML_INDENT;
x1 = indent + obstacle;
x2 = indent;
break;
case Html_EndBLOCKQUOTE:
indent -= 2*HTML_INDENT;
if( indent < 0 ){ indent = 0; }
x1 = indent + obstacle;
x2 = indent;
break;
case Html_APPLET:
case Html_INPUT:
case Html_SELECT:
case Html_EMBED:
case Html_TEXTAREA:
x1 += p->input.w + p->input.padLeft;
if( p->base.style.flags & STY_Preformatted ){
SETMAX( min, x1 );
SETMAX( max, x1 );
x2 += p->input.w + p->input.padLeft;
}else{
SETMAX( min, indent + p->input.w );
SETMAX( max, x1 );
x2 = indent;
}
break;
case Html_BR:
case Html_P:
case Html_EndP:
case Html_DIV:
case Html_EndDIV:
case Html_H1:
case Html_EndH1:
case Html_H2:
case Html_EndH2:
case Html_H3:
case Html_EndH3:
case Html_H4:
case Html_EndH4:
case Html_H5:
case Html_H6:
x1 = indent + obstacle;
x2 = indent;
break;
case Html_EndTD:
case Html_EndTH:
case Html_CAPTION:
case Html_EndTABLE:
case Html_TD:
case Html_TR:
case Html_TH:
case Html_EndTR:
go = 0;
break;
default:
break;
}
if( !go ){ break; }
}
*pMin = min;
*pMax = max;
return p;
}
/* Vertical alignments:
*/
#define VAlign_Unknown 0
#define VAlign_Top 1
#define VAlign_Bottom 2
#define VAlign_Center 3
#define VAlign_Baseline 4
/*
** Return the vertical alignment specified by the given element.
*/
static int GetVerticalAlignment(HtmlElement *p, int dflt){
char *z;
int rc;
if( p==0 ) return dflt;
z = HtmlMarkupArg(p, "valign", 0);
if( z==0 ){
rc = dflt;
TestPoint(0);
}else if( stricmp(z,"top")==0 ){
rc = VAlign_Top;
TestPoint(0);
}else if( stricmp(z,"bottom")==0 ){
rc = VAlign_Bottom;
TestPoint(0);
}else if( stricmp(z,"center")==0 ){
rc = VAlign_Center;
TestPoint(0);
}else if( stricmp(z,"baseline")==0 ){
rc = VAlign_Baseline;
TestPoint(0);
}else{
rc = dflt;
TestPoint(0);
}
return rc;
}
/* Do all layout for a single table. Return the </table> element or
** NULL if the table is unterminated.
*/
HtmlElement *HtmlTableLayout(
HtmlLayoutContext *pLC, /* The layout context */
HtmlElement *pTable /* The <table> element */
){
HtmlElement *pEnd; /* The </table> element */
HtmlElement *p; /* For looping thru elements of the table */
HtmlElement *pNext; /* Next element in the loop */
HtmlElement *pCaption; /* Start of the caption text. The <caption> */
HtmlElement *pEndCaption; /* End of the caption. The </caption> */
int width; /* Width of the table as drawn */
int cellSpacing; /* Value of cellspacing= parameter to <table> */
int cellPadding; /* Value of cellpadding= parameter to <table> */
int tbw; /* Width of the 3D border around the whole table */
int cbw; /* Width of the 3D border around a cell */
int pad; /* cellPadding + borderwidth */
char *z; /* A string */
int leftMargin; /* The left edge of space available for drawing */
int lineWidth; /* Total horizontal space available for drawing */
int separation; /* Distance between content of columns (or rows) */
int i; /* Loop counter */
int n; /* Number of columns */
int btm; /* Bottom edge of previous row */
int iRow; /* Current row number */
int iCol; /* Current column number */
int colspan; /* Number of columns spanned by current cell */
int vspace; /* Value of the vspace= parameter to <table> */
int hspace; /* Value of the hspace= parameter to <table> */
int rowBottom; /* Bottom edge of content in the current row */
int defaultVAlign; /* Default vertical alignment for the current row */
char *zAlign; /* Value of the ALIGN= attribute of the <TABLE> */
#define N HTML_MAX_COLUMNS+1
int y[N]; /* Top edge of each cell's content */
int x[N]; /* Left edge of each cell's content */
int w[N]; /* Width of each cell's content */
int ymax[N]; /* Bottom edge of cell's content if valign=top */
HtmlElement *apElem[N]; /* The <td> or <th> for each cell in a row */
int firstRow[N]; /* First row on which a cell appears */
int lastRow[N]; /* Row to which each cell span's */
int valign[N]; /* Vertical alignment for each cell */
HtmlLayoutContext savedContext; /* Saved copy of the original pLC */
HtmlLayoutContext cellContext; /* Used to render a single cell */
#ifdef TABLE_TRIM_BLANK
extern int HtmlLineWasBlank;
#endif /* TABLE_TRIM_BLANK */
if( pTable==0 || pTable->base.type!=Html_TABLE ){
TestPoint(0);
return pTable;
}
TRACE_PUSH(HtmlTrace_Table2);
TRACE(HtmlTrace_Table2, ("Starting TableLayout() at %s\n",
HtmlTokenName(pTable)));
/* Figure how much horizontal space is available for rendering
** this table. Store the answer in lineWidth. leftMargin is
** the left-most X coordinate of the table. btm stores the top-most
** Y coordinate.
*/
HtmlComputeMargins(pLC, &leftMargin, &btm, &lineWidth);
TRACE(HtmlTrace_Table2, ("...btm=%d left=%d width=%d\n",
btm, leftMargin, lineWidth));
/* figure out how much space the table wants for each column,
** and in total.. */
pEnd = TableDimensions(pLC->htmlPtr, pTable, lineWidth);
/* If we don't have enough horizontal space to accomodate the minimum table
** width, then try to move down past some obstruction (such as an
** <IMG ALIGN=LEFT>) to give us more room.
*/
if( lineWidth < pTable->table.minW[0] ){
HtmlWidenLine(pLC, pTable->table.minW[0], &leftMargin, &btm, &lineWidth);
TRACE(HtmlTrace_Table2, ("Widen to btm=%d left=%d width=%d\n",
btm, leftMargin, lineWidth));
}
savedContext = *pLC;
/* Figure out how wide to draw the table
*/
if( lineWidth < pTable->table.minW[0] ){
width = pTable->table.minW[0];
}else if( lineWidth <= pTable->table.maxW[0] ){
width = lineWidth;
}else{
width = pTable->table.maxW[0];
}
/* Compute the width and left edge position of every column in
** the table */
z = HtmlMarkupArg(pTable, "cellpadding", 0);
cellPadding = z ? atoi(z) : DFLT_CELLPADDING;
cellSpacing = CellSpacing(pLC->htmlPtr, pTable);
z = HtmlMarkupArg(pTable, "vspace", 0);
vspace = z ? atoi(z) : DFLT_VSPACE;
z = HtmlMarkupArg(pTable, "hspace", 0);
hspace = z ? atoi(z) : DFLT_HSPACE;
#ifdef DEBUG
if( HtmlTraceMask & HtmlTrace_Table4 ){
cellPadding = 5;
cellSpacing = 2;
if( vspace<2 ) vspace = 2;
if( hspace<2 ) hspace = 2;
}
#endif
tbw = pTable->table.borderWidth;
cbw = (tbw>0);
pad = cellPadding + cbw;
separation = cellSpacing + 2*pad;
x[1] = leftMargin + tbw + cellSpacing + pad;
n = pTable->table.nCol;
if( n<=0 || pTable->table.maxW[0]<=0 ){
/* Abort if the table has no columns at all or if the total width
** of the table is zero or less. */
return pEnd;
}
zAlign = HtmlMarkupArg(pTable, "align", "");
if( width < lineWidth ){
int align = pTable->base.style.align;
if( align==ALIGN_Right || stricmp(zAlign,"right")==0 ){
x[1] += lineWidth - width;
}else if( align==ALIGN_Center && stricmp(zAlign,"left")!=0 ){
x[1] += (lineWidth - width)/2;
}
}
if( width==pTable->table.maxW[0] ){
w[1] = pTable->table.maxW[1];
for(i=2; i<=n; i++){
w[i] = pTable->table.maxW[i];
x[i] = x[i-1] + w[i-1] + separation;
TestPoint(0);
}
}else if( width > pTable->table.maxW[0] ){
int *tmaxW = pTable->table.maxW;
double scale = ((double)width)/ (double)tmaxW[0];
w[1] = tmaxW[1] * scale;
for(i=2; i<=n; i++){
w[i] = tmaxW[i] * scale;
x[i] = x[i-1] + w[i-1] + separation;
TestPoint(0);
}
}else if( width > pTable->table.minW[0] ){
float scale;
int *tminW = pTable->table.minW;
int *tmaxW = pTable->table.maxW;
scale = (double)(width - tminW[0]) / (double)(tmaxW[0] - tminW[0]);
w[1] = tminW[1] + (tmaxW[1] - tminW[1]) * scale;
for(i=2; i<=n; i++){
w[i] = tminW[i] + (tmaxW[i] - tminW[i]) * scale;
x[i] = x[i-1] + w[i-1] + separation;
TestPoint(0);
}
}else{
w[1] = pTable->table.minW[1];
for(i=2; i<=n; i++){
w[i] = pTable->table.minW[i];
x[i] = x[i-1] + w[i-1] + separation;
TestPoint(0);
}
}
w[n] = width - ((x[n] - x[1]) + 2*(tbw + pad + cellSpacing));
/* Add notation to the pTable structure so that we will know where
** to draw the outer box around the outside of the table.
*/
btm += vspace;
pTable->table.y = btm;
pTable->table.x = x[1] - (tbw + cellSpacing + pad);
pTable->table.w = width;
SETMAX(pLC->maxX, pTable->table.x + pTable->table.w);
btm += tbw + cellSpacing;
/* Begin rendering rows of the table */
for(i=1; i<=n; i++){
firstRow[i] = 0;
lastRow[i] = 0;
apElem[i] = 0;
}
p = pTable->pNext;
rowBottom = btm;
for(iRow=1; iRow<=pTable->table.nRow; iRow++){
TRACE(HtmlTrace_Table2, ("Row %d: btm=%d\n",iRow,btm));
/* Find the start of the next row. Keep an eye out for the caption
** while we search */
while( p && p->base.type!=Html_TR ){
if( p->base.type==Html_CAPTION ){
pCaption = p;
while( p && p!=pEnd && p->base.type!=Html_EndCAPTION ){
p = p->pNext;
}
pEndCaption = p;
}
TRACE(HtmlTrace_Table3, ("Skipping token %s\n", HtmlTokenName(p)));
p = p->pNext;
}
if( p==0 ){ TestPoint(0); break; }
/* Record default vertical alignment flag for this row */
defaultVAlign = GetVerticalAlignment(p, VAlign_Center);
/* Find every new cell on this row */
for(iCol=1; iCol<=pTable->table.nCol && iCol<HTML_MAX_COLUMNS; iCol++){
if( lastRow[iCol]<iRow ) ymax[iCol] = 0;
}
iCol = 0;
for(p=p->pNext; p && p->base.type!=Html_TR && p!=pEnd; p=pNext){
pNext = p->pNext;
TRACE(HtmlTrace_Table3, ("Processing token %s\n", HtmlTokenName(p)));
switch( p->base.type ){
case Html_TD:
case Html_TH:
/* Find the column number for this cell. Be careful to skip
** columns which extend down to this row from prior rows */
do{
iCol++;
}while( iCol <= HTML_MAX_COLUMNS && lastRow[iCol] >= iRow );
TRACE(HtmlTrace_Table2,
("Column %d: x=%d w=%d\n",iCol,x[iCol],w[iCol]));
/* Process the new cell. (Cells beyond the maximum number of
** cells are simply ignored.) */
if( iCol <= HTML_MAX_COLUMNS ){
apElem[iCol] = p;
pNext = p->cell.pEnd;
if( p->cell.rowspan==0 ){
lastRow[iCol] = pTable->table.nRow;
}else{
lastRow[iCol] = iRow + p->cell.rowspan - 1;
}
firstRow[iCol] = iRow;
/* Set vertical alignment flag for this cell */
valign[iCol] = GetVerticalAlignment(p, defaultVAlign);
/* Render cell contents and record the height */
y[iCol] = btm + pad;
cellContext.htmlPtr = pLC->htmlPtr;
cellContext.pStart = p->pNext;
cellContext.pEnd = pNext;
cellContext.headRoom = 0;
cellContext.top = y[iCol];
cellContext.bottom = y[iCol];
cellContext.left = x[iCol];
cellContext.right = 0;
cellContext.pageWidth = x[iCol]+w[iCol];
colspan = p->cell.colspan;
if( colspan==0 ){
for(i=iCol+1; i<=pTable->table.nCol; i++){
cellContext.pageWidth += w[i] + separation;
lastRow[i] = lastRow[iCol];
}
}else if( colspan>1 ){
for(i=iCol+1; i<iCol+colspan; i++){
cellContext.pageWidth += w[i] + separation;
lastRow[i] = lastRow[iCol];
}
}
cellContext.maxX = 0;
cellContext.maxY = 0;
cellContext.leftMargin = 0;
cellContext.rightMargin = 0;
HtmlLock(cellContext.htmlPtr);
HtmlLayoutBlock(&cellContext);
if( HtmlUnlock(cellContext.htmlPtr) ) return 0;
#ifdef TABLE_TRIM_BLANK
/*
* Cancel any trailing vertical whitespace caused
* by break markup
*/
if (HtmlLineWasBlank)
cellContext.maxY -= cellContext.headRoom;
#endif /* TABLE_TRIM_BLANK */
ymax[iCol] = cellContext.maxY;
SETMAX(ymax[iCol], y[iCol]);
HtmlClearMarginStack(&cellContext.leftMargin);
HtmlClearMarginStack(&cellContext.rightMargin);
/* Set coordinates of the cell border */
p->cell.x = x[iCol] - pad;
p->cell.y = btm;
p->cell.w = cellContext.pageWidth + 2*pad - x[iCol];
TRACE(HtmlTrace_Table2,
("Column %d top=%d bottom=%d h=%d left=%d w=%d\n",
iCol, y[iCol], ymax[iCol], ymax[iCol]-y[iCol],
p->cell.x, p->cell.w));
/* Advance the column counter for cells spaning multiple columns */
if( colspan > 1 ){
iCol += colspan - 1;
}else if( colspan==0 ){
iCol = HTML_MAX_COLUMNS + 1;
}
}
break;
case Html_CAPTION:
/* Gotta remember where the caption is so we can render it
** at the end */
pCaption = p;
while( pNext && pNext!=pEnd && pNext->base.type!=Html_EndCAPTION ){
pNext = pNext->pNext;
}
pEndCaption = pNext;
break;
}
}
/* Figure out how high to make this row. */
for(iCol=1; iCol<=pTable->table.nCol; iCol++){
if( lastRow[iCol] == iRow || iRow==pTable->table.nRow ){
SETMAX( rowBottom, ymax[iCol] );
}
}
TRACE(HtmlTrace_Table2, ("Total row height: %d..%d -> %d\n",
btm,rowBottom,rowBottom-btm));
/* Position every cell whose bottom edge ends on this row */
for(iCol=1; iCol<=pTable->table.nCol; iCol++){
int dy; /* Extra space at top of cell used for vertical alignment */
/* Skip any unused cells or cells that extend down thru
** subsequent rows */
if( apElem[iCol]==0
|| (iRow!=pTable->table.nRow && lastRow[iCol]>iRow) ){ continue; }
/* Align the contents of the cell vertically. */
switch( valign[iCol] ){
case VAlign_Unknown:
case VAlign_Center:
dy = (rowBottom - ymax[iCol])/2;
break;
case VAlign_Top:
case VAlign_Baseline:
dy = 0;
break;
case VAlign_Bottom:
dy = rowBottom - ymax[iCol];
break;
}
if( dy ){
HtmlElement *pLast = apElem[iCol]->cell.pEnd;
TRACE(HtmlTrace_Table3, ("Delta column %d by %d\n",iCol,dy));
HtmlMoveVertically(apElem[iCol]->pNext, pLast, dy);
}
/* Record the height of the cell so that the border can be drawn */
apElem[iCol]->cell.h = rowBottom + pad - apElem[iCol]->cell.y;
apElem[iCol] = 0;
}
/* Update btm to the height of the row we just finished setting */
btm = rowBottom + pad + cellSpacing;
}
btm += tbw;
pTable->table.h = btm - pTable->table.y;
SETMAX( pLC->maxY, btm );
pLC->bottom = btm + vspace;
/* Render the caption, if there is one */
if( pCaption ){
}
/* Whenever we do any table layout, we need to recompute all the
** HtmlBlocks. The following statement forces this. */
pLC->htmlPtr->firstBlock = pLC->htmlPtr->lastBlock = 0;
/* Adjust the context for text that wraps around the table, if
** requested by an ALIGN=RIGHT or ALIGN=LEFT attribute.
*/
if( stricmp(zAlign,"left")==0 ){
savedContext.maxX = pLC->maxX;
savedContext.maxY = pLC->maxY;
*pLC = savedContext;
HtmlPushMargin(&pLC->leftMargin, pTable->table.w + 2,
pTable->table.y + pTable->table.h + 2, 0);
}else if( stricmp(zAlign,"right")==0 ){
savedContext.maxX = pLC->maxX;
savedContext.maxY = pLC->maxY;
*pLC = savedContext;
HtmlPushMargin(&pLC->rightMargin, pTable->table.w + 2,
pTable->table.y + pTable->table.h + 2, 0);
}
/* All done */
TRACE(HtmlTrace_Table2, (
"Done with TableLayout(). x=%d y=%d w=%d h=%d Return %s\n",
pTable->table.x, pTable->table.y, pTable->table.w, pTable->table.h,
HtmlTokenName(pEnd)));
TRACE_POP(HtmlTrace_Table2);
return pEnd;
}
/*
** Move all elements in the given list vertically by the amount dy
*/
void HtmlMoveVertically(
HtmlElement *p, /* First element to move */
HtmlElement *pLast, /* Last element. Do move this one */
int dy /* Amount by which to move */
){
if( dy==0 ){ TestPoint(0); return; }
while( p && p!=pLast ){
switch( p->base.type ){
case Html_A:
p->anchor.y += dy;
break;
case Html_Text:
p->text.y += dy;
break;
case Html_LI:
p->li.y += dy;
break;
case Html_TD:
case Html_TH:
p->cell.y += dy;
break;
case Html_TABLE:
p->table.y += dy;
break;
case Html_IMG:
p->image.y += dy;
break;
case Html_INPUT:
case Html_SELECT:
case Html_APPLET:
case Html_EMBED:
case Html_TEXTAREA:
p->input.y += dy;
break;
default:
break;
}
p = p->pNext;
}
}