pjs/layout/tables/FixedTableLayoutStrategy.cpp

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6.3 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "FixedTableLayoutStrategy.h"
#include "nsTableFrame.h"
#include "nsTableColFrame.h"
#include "nsTableCellFrame.h"
#include "nsIStyleContext.h"
#include "nsStyleConsts.h"
#include "nsVoidArray.h"
#include "nsIPtr.h"
#include "nsHTMLIIDs.h"
NS_DEF_PTR(nsIStyleContext);
#ifdef NS_DEBUG
static PRBool gsDebug = PR_FALSE;
#else
static const PRBool gsDebug = PR_FALSE;
#endif
FixedTableLayoutStrategy::FixedTableLayoutStrategy(nsTableFrame *aFrame)
: BasicTableLayoutStrategy(aFrame)
{
}
FixedTableLayoutStrategy::~FixedTableLayoutStrategy()
{
}
PRBool FixedTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext *aTableStyle,
const nsHTMLReflowState& aReflowState,
nscoord aMaxWidth)
{
#ifdef NS_DEBUG
nsIFrame *tablePIF=nsnull;
mTableFrame->GetPrevInFlow(&tablePIF);
NS_ASSERTION(nsnull==tablePIF, "never ever call me on a continuing frame!");
#endif
PRBool result = PR_TRUE;
NS_ASSERTION(nsnull!=aTableStyle, "bad arg");
if (nsnull==aTableStyle)
return PR_FALSE;
if (PR_TRUE==gsDebug)
{
printf("\n%p: BALANCE COLUMN WIDTHS\n", mTableFrame);
for (PRInt32 i=0; i<mNumCols; i++)
printf(" col %d assigned width %d\n", i, mTableFrame->GetColumnWidth(i));
printf("\n");
}
// XXX Hey Cujo, result has never been initialized...
return result;
}
/* 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::AssignPreliminaryColumnWidths()
{
if (gsDebug==PR_TRUE) printf ("** %p: AssignPreliminaryColumnWidths **\n", mTableFrame);
PRInt32 colIndex;
PRInt32 specifiedColumns=0; // the number of columns whose width is given
nscoord totalWidth = 0; // the sum of the widths of the columns whose width is given
PRBool * autoWidthColumns = new PRBool[mNumCols];
nsCRT::memset(autoWidthColumns, PR_TRUE, mNumCols*sizeof(PRBool));
// for every column, determine it's specified width
for (colIndex = 0; colIndex<mNumCols; colIndex++)
{
// Get column information
nsTableColFrame *colFrame = mTableFrame->GetColFrame(colIndex);
NS_ASSERTION(nsnull!=colFrame, "bad col frame");
// Get the columns's style
const nsStylePosition* colPosition;
colFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)colPosition);
// Get fixed column width if it has one
if (eStyleUnit_Coord==colPosition->mWidth.GetUnit())
{
nscoord colWidth = colPosition->mWidth.GetCoordValue();
mTableFrame->SetColumnWidth(colIndex, colWidth);
totalWidth += colWidth;
specifiedColumns++;
autoWidthColumns[colIndex]=PR_FALSE;
if (PR_TRUE==gsDebug)
printf ("from col, col %d set to width %d\n", colIndex, colWidth);
}
else
{
nsTableCellFrame *cellFrame = mTableFrame->GetCellFrameAt(0, colIndex);
if (nsnull!=cellFrame)
{
// Get the cell's style
const nsStylePosition* cellPosition;
cellFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)cellPosition);
// Get fixed column width if it has one
if (eStyleUnit_Coord==cellPosition->mWidth.GetUnit())
{
PRInt32 colSpan = mTableFrame->GetEffectiveColSpan(colIndex, cellFrame);
nscoord effectiveWidth = cellPosition->mWidth.GetCoordValue()/colSpan;
mTableFrame->SetColumnWidth(colIndex, effectiveWidth);
totalWidth += effectiveWidth;
specifiedColumns++;
autoWidthColumns[colIndex]=PR_FALSE;
if (PR_TRUE==gsDebug)
printf ("from cell, col %d set to width %d\n", colIndex, effectiveWidth);
}
}
}
}
// for every column that did not have a specified width, compute its width from the remaining space
if (mNumCols > specifiedColumns)
{
// Get the table's style
const nsStylePosition* tablePosition;
mTableFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)tablePosition);
if (eStyleUnit_Coord==tablePosition->mWidth.GetUnit())
{
nscoord specifiedTableWidth = tablePosition->mWidth.GetCoordValue();
nscoord remainingTableWidth = specifiedTableWidth - totalWidth;
if (PR_TRUE==gsDebug)
printf ("%p: specifiedTW=%d, remainingTW=%d\n",
mTableFrame, specifiedTableWidth, remainingTableWidth);
if (0<remainingTableWidth)
{
nscoord widthPerColumn = remainingTableWidth/(mNumCols-specifiedColumns);
for (colIndex = 0; colIndex<mNumCols; colIndex++)
{
if (PR_TRUE==autoWidthColumns[colIndex])
{
mTableFrame->SetColumnWidth(colIndex, widthPerColumn);
totalWidth += widthPerColumn;
if (PR_TRUE==gsDebug)
printf ("auto col %d set to width %d\n", colIndex, widthPerColumn);
}
}
}
}
}
// min/MaxTW is max of (specified table width, sum of specified column(cell) widths)
mMinTableWidth = mMaxTableWidth = totalWidth;
if (PR_TRUE==gsDebug)
printf ("%p: aMinTW=%d, aMaxTW=%d\n", mTableFrame, mMinTableWidth, mMaxTableWidth);
// clean up
if (nsnull!=autoWidthColumns)
{
delete [] autoWidthColumns;
}
return PR_TRUE;
}