author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:28:30 +0100 | |
branch | RCL_3 |
changeset 49 | 919f36ff910f |
parent 48 | 79859ed3eea9 |
permissions | -rw-r--r-- |
0
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/* |
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* This file is part of the HTML rendering engine for KDE. |
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* |
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* Copyright (C) 2002 Lars Knoll (knoll@kde.org) |
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* (C) 2002 Dirk Mueller (mueller@kde.org) |
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* Copyright (C) 2003, 2006 Apple Computer, Inc. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Library General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public License |
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* along with this library; see the file COPYING.LIB. If not, write to |
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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* Boston, MA 02110-1301, USA. |
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*/ |
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|
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#include "config.h" |
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#include "FixedTableLayout.h" |
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#include "RenderTable.h" |
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#include "RenderTableCell.h" |
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#include "RenderTableCol.h" |
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#include "RenderTableSection.h" |
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|
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/* |
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The text below is from the CSS 2.1 specs. |
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|
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Fixed table layout |
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|
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With this (fast) algorithm, the horizontal layout of the table does |
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not depend on the contents of the cells; it only depends on the |
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table's width, the width of the columns, and borders or cell |
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spacing. |
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|
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The table's width may be specified explicitly with the 'width' |
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property. A value of 'auto' (for both 'display: table' and 'display: |
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inline-table') means use the automatic table layout algorithm. |
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In the fixed table layout algorithm, the width of each column is |
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determined as follows: |
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1. A column element with a value other than 'auto' for the 'width' |
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property sets the width for that column. |
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|
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2. Otherwise, a cell in the first row with a value other than |
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'auto' for the 'width' property sets the width for that column. If |
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the cell spans more than one column, the width is divided over the |
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columns. |
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|
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3. Any remaining columns equally divide the remaining horizontal |
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table space (minus borders or cell spacing). |
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The width of the table is then the greater of the value of the |
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'width' property for the table element and the sum of the column |
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widths (plus cell spacing or borders). If the table is wider than |
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the columns, the extra space should be distributed over the columns. |
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In this manner, the user agent can begin to lay out the table once |
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the entire first row has been received. Cells in subsequent rows do |
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not affect column widths. Any cell that has content that overflows |
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uses the 'overflow' property to determine whether to clip the |
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overflow content. |
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*/ |
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using namespace std; |
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namespace WebCore { |
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FixedTableLayout::FixedTableLayout(RenderTable* table) |
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: TableLayout(table) |
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{ |
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} |
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int FixedTableLayout::calcWidthArray(int tableWidth) |
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{ |
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int usedWidth = 0; |
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// iterate over all <col> elements |
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RenderObject* child = m_table->firstChild(); |
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int cCol = 0; |
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int nEffCols = m_table->numEffCols(); |
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m_width.resize(nEffCols); |
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m_width.fill(Length(Auto)); |
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Length grpWidth; |
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while (child) { |
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if (child->isTableCol()) { |
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RenderTableCol *col = static_cast<RenderTableCol *>(child); |
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int span = col->span(); |
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if (col->firstChild()) |
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grpWidth = col->style()->width(); |
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else { |
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Length w = col->style()->width(); |
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if (w.isAuto()) |
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w = grpWidth; |
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int effWidth = 0; |
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if (w.isFixed() && w.value() > 0) |
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effWidth = w.value(); |
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int usedSpan = 0; |
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109 |
int i = 0; |
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110 |
while (usedSpan < span) { |
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if(cCol + i >= nEffCols) { |
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m_table->appendColumn(span - usedSpan); |
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nEffCols++; |
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m_width.resize(nEffCols); |
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m_width[nEffCols-1] = Length(); |
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} |
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int eSpan = m_table->spanOfEffCol(cCol+i); |
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if ((w.isFixed() || w.isPercent()) && w.isPositive()) { |
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m_width[cCol + i].setRawValue(w.type(), w.rawValue() * eSpan); |
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usedWidth += effWidth * eSpan; |
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121 |
} |
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usedSpan += eSpan; |
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i++; |
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124 |
} |
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cCol += i; |
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126 |
} |
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} else |
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128 |
break; |
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129 |
|
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RenderObject *next = child->firstChild(); |
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131 |
if (!next) |
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next = child->nextSibling(); |
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if (!next && child->parent()->isTableCol()) { |
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next = child->parent()->nextSibling(); |
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grpWidth = Length(); |
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136 |
} |
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child = next; |
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138 |
} |
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139 |
|
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// Iterate over the first row in case some are unspecified. |
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141 |
RenderTableSection* section = m_table->header(); |
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142 |
if (!section) |
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143 |
section = m_table->firstBody(); |
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144 |
if (!section) |
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section = m_table->footer(); |
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146 |
if (section && !section->numRows()) |
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147 |
section = m_table->sectionBelow(section, true); |
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148 |
if (section) { |
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149 |
cCol = 0; |
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RenderObject* firstRow = section->firstChild(); |
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child = firstRow->firstChild(); |
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152 |
while (child) { |
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153 |
if (child->isTableCell()) { |
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RenderTableCell* cell = static_cast<RenderTableCell*>(child); |
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155 |
if (cell->prefWidthsDirty()) |
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156 |
cell->calcPrefWidths(); |
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157 |
|
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158 |
Length w = cell->styleOrColWidth(); |
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int span = cell->colSpan(); |
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int effWidth = 0; |
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161 |
if (w.isFixed() && w.isPositive()) |
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effWidth = w.value(); |
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163 |
|
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164 |
int usedSpan = 0; |
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165 |
int i = 0; |
49 | 166 |
while (usedSpan < span && cCol + i < nEffCols) { |
0
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167 |
int eSpan = m_table->spanOfEffCol(cCol + i); |
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168 |
// Only set if no col element has already set it. |
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169 |
if (m_width[cCol + i].isAuto() && w.type() != Auto) { |
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170 |
m_width[cCol + i].setRawValue(w.type(), w.rawValue() * eSpan / span); |
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171 |
usedWidth += effWidth * eSpan / span; |
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172 |
} |
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173 |
usedSpan += eSpan; |
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174 |
i++; |
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175 |
} |
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176 |
cCol += i; |
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177 |
} |
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178 |
child = child->nextSibling(); |
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179 |
} |
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180 |
} |
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181 |
|
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182 |
return usedWidth; |
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183 |
} |
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184 |
|
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185 |
void FixedTableLayout::calcPrefWidths(int& minWidth, int& maxWidth) |
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186 |
{ |
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187 |
// FIXME: This entire calculation is incorrect for both minwidth and maxwidth. |
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188 |
|
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189 |
// we might want to wait until we have all of the first row before |
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190 |
// layouting for the first time. |
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191 |
|
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192 |
// only need to calculate the minimum width as the sum of the |
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193 |
// cols/cells with a fixed width. |
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194 |
// |
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195 |
// The maximum width is max(minWidth, tableWidth). |
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196 |
int bs = m_table->bordersPaddingAndSpacing(); |
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197 |
|
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198 |
int tableWidth = m_table->style()->width().isFixed() ? m_table->style()->width().value() - bs : 0; |
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199 |
int mw = calcWidthArray(tableWidth) + bs; |
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200 |
|
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201 |
minWidth = max(mw, tableWidth); |
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202 |
maxWidth = minWidth; |
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203 |
} |
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204 |
|
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205 |
void FixedTableLayout::layout() |
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206 |
{ |
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207 |
int tableWidth = m_table->width() - m_table->bordersPaddingAndSpacing(); |
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208 |
int nEffCols = m_table->numEffCols(); |
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209 |
Vector<int> calcWidth(nEffCols, 0); |
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210 |
|
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211 |
int numAuto = 0; |
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212 |
int totalFixedWidth = 0; |
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213 |
int totalPercentWidth = 0; |
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214 |
int totalRawPercent = 0; |
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|
215 |
|
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216 |
// Compute requirements and try to satisfy fixed and percent widths. |
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217 |
// Percentages are of the table's width, so for example |
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// for a table width of 100px with columns (40px, 10%), the 10% compute |
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// to 10px here, and will scale up to 20px in the final (80px, 20px). |
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for (int i = 0; i < nEffCols; i++) { |
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if (m_width[i].isFixed()) { |
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calcWidth[i] = m_width[i].value(); |
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totalFixedWidth += calcWidth[i]; |
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} else if (m_width[i].isPercent()) { |
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calcWidth[i] = m_width[i].calcValue(tableWidth); |
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totalPercentWidth += calcWidth[i]; |
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totalRawPercent += m_width[i].rawValue(); |
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} else if (m_width[i].isAuto()) |
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numAuto++; |
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} |
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|
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int totalWidth = totalFixedWidth + totalPercentWidth; |
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if (!numAuto || totalWidth > tableWidth) { |
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// If there are no auto columns, or if the total is too wide, take |
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// what we have and scale it to fit as necessary. |
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if (totalWidth != tableWidth) { |
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// Fixed widths only scale up |
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if (totalFixedWidth && totalWidth < tableWidth) { |
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totalFixedWidth = 0; |
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for (int i = 0; i < nEffCols; i++) { |
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if (m_width[i].isFixed()) { |
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calcWidth[i] = calcWidth[i] * tableWidth / totalWidth; |
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totalFixedWidth += calcWidth[i]; |
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} |
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} |
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} |
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if (totalRawPercent) { |
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totalPercentWidth = 0; |
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for (int i = 0; i < nEffCols; i++) { |
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if (m_width[i].isPercent()) { |
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calcWidth[i] = m_width[i].rawValue() * (tableWidth - totalFixedWidth) / totalRawPercent; |
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totalPercentWidth += calcWidth[i]; |
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} |
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} |
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} |
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totalWidth = totalFixedWidth + totalPercentWidth; |
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} |
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} else { |
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// Divide the remaining width among the auto columns. |
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int remainingWidth = tableWidth - totalFixedWidth - totalPercentWidth; |
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int lastAuto = 0; |
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for (int i = 0; i < nEffCols; i++) { |
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if (m_width[i].isAuto()) { |
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calcWidth[i] = remainingWidth / numAuto; |
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remainingWidth -= calcWidth[i]; |
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if (!remainingWidth) |
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break; |
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lastAuto = i; |
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numAuto--; |
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} |
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} |
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// Last one gets the remainder. |
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if (remainingWidth) |
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calcWidth[lastAuto] += remainingWidth; |
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totalWidth = tableWidth; |
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} |
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|
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if (totalWidth < tableWidth) { |
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// Spread extra space over columns. |
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int remainingWidth = tableWidth - totalWidth; |
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int total = nEffCols; |
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while (total) { |
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int w = remainingWidth / total; |
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remainingWidth -= w; |
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calcWidth[--total] += w; |
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} |
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calcWidth[nEffCols - 1] += remainingWidth; |
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} |
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|
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int pos = 0; |
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int hspacing = m_table->hBorderSpacing(); |
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for (int i = 0; i < nEffCols; i++) { |
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m_table->columnPositions()[i] = pos; |
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pos += calcWidth[i] + hspacing; |
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} |
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m_table->columnPositions()[m_table->columnPositions().size() - 1] = pos; |
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} |
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|
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} // namespace WebCore |