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208 lines
7.9 KiB
C++
208 lines
7.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "FixedTableLayoutStrategy.h"
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#include "nsTableFrame.h"
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#include "nsTableColFrame.h"
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#include "nsTableCellFrame.h"
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#include "nsIStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsVoidArray.h"
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#include "nsIPtr.h"
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#include "nsHTMLIIDs.h"
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NS_DEF_PTR(nsIStyleContext);
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#ifdef NS_DEBUG
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static PRBool gsDebug = PR_FALSE;
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#else
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static const PRBool gsDebug = PR_FALSE;
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#endif
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FixedTableLayoutStrategy::FixedTableLayoutStrategy(nsTableFrame *aFrame)
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: BasicTableLayoutStrategy(aFrame)
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{
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}
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FixedTableLayoutStrategy::~FixedTableLayoutStrategy()
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{
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}
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PRBool FixedTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext* aTableStyle,
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const nsHTMLReflowState& aReflowState,
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nscoord aMaxWidth)
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{
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if (PR_TRUE==gsDebug) {
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printf("\n%p: BALANCE COLUMN WIDTHS\n", mTableFrame);
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for (PRInt32 i=0; i<mNumCols; i++)
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printf(" col %d assigned width %d\n", i, mTableFrame->GetColumnWidth(i));
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printf("\n");
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}
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return PR_TRUE;
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}
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/*
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* assign the width of all columns
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* if there is a colframe with a width attribute, use it as the column width
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* otherwise if there is a cell in the first row and it has a width attribute, use it
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* if this cell includes a colspan, width is divided equally among spanned columns
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* otherwise the cell get a proportion of the remaining space
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* as determined by the table width attribute. If no table width attribute, it gets 0 width
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*/
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PRBool FixedTableLayoutStrategy::AssignPreliminaryColumnWidths(nscoord aComputedWidth)
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{
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// NS_ASSERTION(aComputedWidth != NS_UNCONSTRAINEDSIZE, "bad computed width");
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if (gsDebug==PR_TRUE) printf ("** %p: AssignPreliminaryColumnWidths **\n", mTableFrame);
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const nsStylePosition* tablePosition;
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mTableFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)tablePosition);
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PRBool tableIsFixedWidth = eStyleUnit_Coord == tablePosition->mWidth.GetUnit() ||
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eStyleUnit_Percent == tablePosition->mWidth.GetUnit();
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const nsStyleSpacing* tableSpacing;
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mTableFrame->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)tableSpacing);
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nsMargin borderPadding;
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tableSpacing->CalcBorderPaddingFor(mTableFrame, borderPadding);
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PRInt32 colX;
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// availWidth is used as the basis for percentage width columns. It is aComputedWidth
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// minus table border, padding, & cellspacing
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nscoord availWidth = aComputedWidth - borderPadding.left - borderPadding.right -
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((mNumCols + 1) * mTableFrame->GetCellSpacingX());
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PRInt32 specifiedCols = 0; // the number of columns whose width is given
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nscoord totalColWidth = 0; // the sum of the widths of the columns
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nscoord* colWidths = new PRBool[mNumCols];
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nsCRT::memset(colWidths, -1, mNumCols*sizeof(nscoord));
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// for every column, determine its specified width
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for (colX = 0; colX < mNumCols; colX++) {
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// Get column information
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nsTableColFrame* colFrame = mTableFrame->GetColFrame(colX);
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if (!colFrame) {
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NS_ASSERTION(PR_FALSE, "bad col frame");
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return PR_FALSE;
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}
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// Get the columns's style
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const nsStylePosition* colPosition;
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colFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)colPosition);
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// get the fixed width if available
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if (eStyleUnit_Coord == colPosition->mWidth.GetUnit()) {
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colWidths[colX] = colPosition->mWidth.GetCoordValue();
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} // get the percentage width
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else if ((eStyleUnit_Percent == colPosition->mWidth.GetUnit()) &&
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(aComputedWidth != NS_UNCONSTRAINEDSIZE)) {
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// Only apply percentages if we're unconstrained.
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float percent = colPosition->mWidth.GetPercentValue();
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colWidths[colX] = NSToCoordRound(percent * (float)availWidth);
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}
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else { // get width from the cell
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nsTableCellFrame* cellFrame = mTableFrame->GetCellFrameAt(0, colX);
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if (nsnull != cellFrame) {
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// Get the cell's style
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const nsStylePosition* cellPosition;
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cellFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)cellPosition);
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PRInt32 colSpan = mTableFrame->GetEffectiveColSpan(cellFrame);
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// Get fixed cell width if available
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if (eStyleUnit_Coord == cellPosition->mWidth.GetUnit()) {
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colWidths[colX] = cellPosition->mWidth.GetCoordValue() / colSpan;
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}
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else if ((eStyleUnit_Percent == cellPosition->mWidth.GetUnit()) &&
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(aComputedWidth != NS_UNCONSTRAINEDSIZE)) {
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float percent = cellPosition->mWidth.GetPercentValue();
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colWidths[colX] = NSToCoordRound(percent * (float)availWidth / (float)colSpan);
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}
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}
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}
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if (colWidths[colX] >= 0) {
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totalColWidth += colWidths[colX];
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specifiedCols++;
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if (PR_TRUE==gsDebug) printf ("col %d set to width %d\n", colX, colWidths[colX]);
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}
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}
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nscoord lastColAllocated = -1;
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nscoord remainingWidth = availWidth - totalColWidth;
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if (remainingWidth >= 500000) {
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// let's put a cap on the width so that it doesn't become insane.
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remainingWidth = 100;
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}
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if (tableIsFixedWidth && (0 < remainingWidth)) {
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if (mNumCols > specifiedCols) {
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// allocate the extra space to the columns which have no width specified
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if (PR_TRUE == gsDebug) printf ("%p: remainingTW=%d\n", mTableFrame, remainingWidth);
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nscoord colAlloc = NSToCoordRound( ((float)remainingWidth) / (((float)mNumCols) - ((float)specifiedCols)));
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for (colX = 0; colX < mNumCols; colX++) {
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if (-1 == colWidths[colX]) {
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colWidths[colX] = colAlloc;
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totalColWidth += colAlloc;
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lastColAllocated = colX;
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if (PR_TRUE == gsDebug) printf ("auto col %d set to width %d\n", colX, colAlloc);
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}
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}
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}
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else { // allocate the extra space to the columns which have width specified
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float divisor = (float)totalColWidth;
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for (colX = 0; colX < mNumCols; colX++) {
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if (colWidths[colX] > 0) {
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nscoord colAlloc = NSToCoordRound(remainingWidth * colWidths[colX] / divisor);
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colWidths[colX] += colAlloc;
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totalColWidth += colAlloc;
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lastColAllocated = colX;
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if (PR_TRUE == gsDebug) printf ("col %d set to width %d\n", colX, colWidths[colX]);
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}
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}
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}
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}
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nscoord overAllocation = (availWidth >= 0)
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? totalColWidth - availWidth : 0;
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// set the column widths
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for (colX = 0; colX < mNumCols; colX++) {
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if (colWidths[colX] < 0)
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colWidths[colX] = 0;
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// if there was too much allocated due to rounding, remove it from the last col
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if ((colX == lastColAllocated) && (overAllocation != 0)) {
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colWidths[colX] += overAllocation;
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colWidths[colX] = PR_MAX(0, colWidths[colX]);
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}
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mTableFrame->SetColumnWidth(colX, colWidths[colX]);
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}
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// min/max TW is min/max of (specified table width, sum of specified column(cell) widths)
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mMinTableContentWidth = mMaxTableContentWidth = totalColWidth;
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if (PR_TRUE == gsDebug) printf ("%p: aMinTW=%d, aMaxTW=%d\n", mTableFrame, mMinTableContentWidth, mMaxTableContentWidth);
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// clean up
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if (nsnull != colWidths) {
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delete [] colWidths;
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}
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return PR_TRUE;
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}
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