gecko-dev/layout/tables/FixedTableLayoutStrategy.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
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* Version 1.1 (the "License"); you may not use this file except in
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*
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* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
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* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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#include "FixedTableLayoutStrategy.h"
#include "nsTableFrame.h"
#include "nsTableCellFrame.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsVoidArray.h"
FixedTableLayoutStrategy::FixedTableLayoutStrategy(nsTableFrame *aFrame)
: BasicTableLayoutStrategy(aFrame)
{
}
FixedTableLayoutStrategy::~FixedTableLayoutStrategy()
{
}
PRBool FixedTableLayoutStrategy::BalanceColumnWidths(nsIPresContext* aPresContext,
const nsHTMLReflowState& aReflowState)
{
return PR_TRUE;
}
/*
* assign the width of all columns
* if there is a colframe with a width attribute, use it as the column width
* otherwise if there is a cell in the first row and it has a width attribute, use it
* if this cell includes a colspan, width is divided equally among spanned columns
* otherwise the cell get a proportion of the remaining space
* as determined by the table width attribute. If no table width attribute, it gets 0 width
*/
PRBool
FixedTableLayoutStrategy::AssignNonPctColumnWidths(nsIPresContext* aPresContext,
nscoord aComputedWidth,
const nsHTMLReflowState& aReflowState,
float aPixelToTwips)
{
// NS_ASSERTION(aComputedWidth != NS_UNCONSTRAINEDSIZE, "bad computed width");
const nsStylePosition* tablePosition;
mTableFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)tablePosition);
PRBool tableIsFixedWidth = eStyleUnit_Coord == tablePosition->mWidth.GetUnit() ||
eStyleUnit_Percent == tablePosition->mWidth.GetUnit();
PRInt32 numCols = mTableFrame->GetColCount();
PRInt32 colX;
// availWidth is used as the basis for percentage width columns. It is aComputedWidth
// minus table border, padding, & cellspacing
nscoord availWidth = (NS_UNCONSTRAINEDSIZE == aComputedWidth)
? NS_UNCONSTRAINEDSIZE
: aComputedWidth - aReflowState.mComputedBorderPadding.left -
aReflowState.mComputedBorderPadding.right -
((numCols + 1) * mTableFrame->GetCellSpacingX());
PRInt32 specifiedCols = 0; // the number of columns whose width is given
nscoord totalColWidth = 0; // the sum of the widths of the columns
nscoord* colWidths = new PRBool[numCols];
if (!colWidths) return PR_FALSE;
memset(colWidths, WIDTH_NOT_SET, numCols*sizeof(nscoord));
nscoord* propInfo = new PRBool[numCols];
if (!propInfo) {
delete [] colWidths;
return PR_FALSE;
}
float p2t;
aPresContext->GetScaledPixelsToTwips(&p2t);
memset(propInfo, 0, numCols*sizeof(nscoord));
nscoord propTotal = 0;
nscoord percTotal = 0;
// for every column, determine its specified width
for (colX = 0; colX < numCols; colX++) {
// Get column information
nsTableColFrame* colFrame = mTableFrame->GetColFrame(colX);
if (!colFrame) {
NS_ASSERTION(PR_FALSE, "bad col frame");
return PR_FALSE;
}
// Get the columns's style
const nsStylePosition* colPosition;
colFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)colPosition);
// get the fixed width if available
if (eStyleUnit_Coord == colPosition->mWidth.GetUnit()) {
colWidths[colX] = colPosition->mWidth.GetCoordValue();
colFrame->SetWidth(MIN_CON, colWidths[colX]);
} // get the percentage width
else if ((eStyleUnit_Percent == colPosition->mWidth.GetUnit()) &&
(aComputedWidth != NS_UNCONSTRAINEDSIZE)) {
// Only apply percentages if we're constrained.
float percent = colPosition->mWidth.GetPercentValue();
colWidths[colX] = nsTableFrame::RoundToPixel(NSToCoordRound(percent * (float)availWidth), aPixelToTwips);
colFrame->SetWidth(PCT, colWidths[colX]);
percTotal+=colWidths[colX];
}
else if (eStyleUnit_Proportional == colPosition->mWidth.GetUnit() &&
colPosition->mWidth.GetIntValue() > 0) {
propInfo[colX] = colPosition->mWidth.GetIntValue();
propTotal += propInfo[colX];
}
else { // get width from the cell
nsTableCellFrame* cellFrame = mTableFrame->GetCellFrameAt(0, colX);
if (nsnull != cellFrame) {
// Get the cell's style
const nsStylePosition* cellPosition;
cellFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)cellPosition);
PRInt32 colSpan = mTableFrame->GetEffectiveColSpan(*cellFrame);
// Get fixed cell width if available
if (eStyleUnit_Coord == cellPosition->mWidth.GetUnit()) {
colWidths[colX] = nsTableFrame::RoundToPixel(cellPosition->mWidth.GetCoordValue() / colSpan, p2t);
colFrame->SetWidth(MIN_CON, colWidths[colX]);
}
else if ((eStyleUnit_Percent == cellPosition->mWidth.GetUnit()) &&
(aComputedWidth != NS_UNCONSTRAINEDSIZE)) {
float percent = cellPosition->mWidth.GetPercentValue();
colWidths[colX] = nsTableFrame::RoundToPixel(NSToCoordRound(percent * (float)availWidth / (float)colSpan), aPixelToTwips);
colFrame->SetWidth(PCT, colWidths[colX]);
percTotal += colWidths[colX];
}
}
}
if (colWidths[colX] >= 0) {
totalColWidth += colWidths[colX];
specifiedCols++;
}
}
nscoord lastColAllocated = -1;
nscoord remainingWidth = availWidth - totalColWidth;
if(availWidth == NS_UNCONSTRAINEDSIZE)
remainingWidth = 0;
if (remainingWidth >= 500000) {
// let's put a cap on the width so that it doesn't become insane.
remainingWidth = 100;
}
if (0 < remainingWidth) {
if (propTotal > 0) {
nscoord amountToAllocate = 0;
for (colX = 0; colX < numCols; colX++) {
if (propInfo[colX] > 0) {
// We're proportional
float percent = ((float)propInfo[colX])/((float)propTotal);
amountToAllocate += NSToCoordRound(percent * (float)remainingWidth);
colWidths[colX] = (amountToAllocate > 0) ?
nsTableFrame::RoundToPixel(amountToAllocate, aPixelToTwips,
eRoundUpIfHalfOrMore) : 0;
totalColWidth += colWidths[colX];
amountToAllocate -= colWidths[colX];
lastColAllocated = colX;
}
}
}
else if (tableIsFixedWidth) {
if (numCols > specifiedCols) {
// allocate the extra space to the columns which have no width specified
nscoord colAlloc =
NSToCoordRound(((float)remainingWidth) /
(((float)numCols) - ((float)specifiedCols)));
nscoord amountToAllocate = 0;
for (colX = 0; colX < numCols; colX++) {
if (-1 == colWidths[colX]) {
amountToAllocate += colAlloc;
colWidths[colX] = (amountToAllocate > 0) ?
nsTableFrame::RoundToPixel(amountToAllocate,
aPixelToTwips,
eRoundUpIfHalfOrMore) : 0;
totalColWidth += colWidths[colX];
amountToAllocate -= colWidths[colX];
lastColAllocated = colX;
}
}
}
else { // allocate the extra space to the columns which have width specified
float divisor = (float)totalColWidth;
nscoord amountToAllocate = 0;
for (colX = 0; colX < numCols; colX++) {
if (colWidths[colX] > 0) {
amountToAllocate += NSToCoordRound(remainingWidth * colWidths[colX] / divisor);
nscoord colAlloc = (amountToAllocate > 0) ?
nsTableFrame::RoundToPixel(amountToAllocate, aPixelToTwips,
eRoundUpIfHalfOrMore) : 0;
colWidths[colX] += colAlloc;
totalColWidth += colAlloc;
amountToAllocate -= colAlloc;
lastColAllocated = colX;
}
}
}
}
}
nscoord overAllocation = ((availWidth >= 0) && (availWidth != NS_UNCONSTRAINEDSIZE))
? totalColWidth - availWidth : 0;
// set the column widths
for (colX = 0; colX < numCols; colX++) {
if (colWidths[colX] < 0)
colWidths[colX] = 0;
// if there was too much allocated due to rounding, remove it from the last col
if ((colX == lastColAllocated) && (overAllocation != 0)) {
nscoord thisRemoval = nsTableFrame::RoundToPixel(overAllocation, aPixelToTwips);
colWidths[colX] -= thisRemoval;
totalColWidth -= thisRemoval;
totalColWidth -= colWidths[colX] - PR_MAX(0, colWidths[colX]);
colWidths[colX] = PR_MAX(0, colWidths[colX]);
}
}
overAllocation = ((availWidth >= 0) && (availWidth != NS_UNCONSTRAINEDSIZE))
? totalColWidth - availWidth : 0;
if(overAllocation > 0){
// reduce over specified percent col
nscoord amountToRemove = 0;
for (colX = 0; colX < numCols; colX++) {
nsTableColFrame* colFrame = mTableFrame->GetColFrame(colX);
if(( colFrame->GetWidth(PCT) > 0) && ( percTotal > 0)){
amountToRemove += NSToCoordRound(overAllocation* colWidths[colX] / (float) percTotal);
nscoord thisRemoval = (amountToRemove > 0) ?
nsTableFrame::RoundToPixel(amountToRemove, aPixelToTwips,
eRoundUpIfHalfOrMore) : 0;
colWidths[colX] -= thisRemoval;
amountToRemove -= thisRemoval;
totalColWidth -= thisRemoval;
totalColWidth -= colWidths[colX] - PR_MAX(0, colWidths[colX]);
colWidths[colX] = PR_MAX(0, colWidths[colX]);
colFrame->SetWidth(PCT, colWidths[colX]);
}
}
}
for (colX = 0; colX < numCols; colX++) {
mTableFrame->SetColumnWidth(colX, colWidths[colX]);
}
// clean up
if (nsnull != colWidths) {
delete [] colWidths;
}
if (nsnull != propInfo) {
delete [] propInfo;
}
return PR_TRUE;
}