зеркало из https://github.com/mozilla/pjs.git
187 строки
6.3 KiB
C++
187 строки
6.3 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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#ifdef NS_DEBUG
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nsIFrame *tablePIF=nsnull;
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mTableFrame->GetPrevInFlow(&tablePIF);
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NS_ASSERTION(nsnull==tablePIF, "never ever call me on a continuing frame!");
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#endif
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PRBool result = PR_TRUE;
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NS_ASSERTION(nsnull!=aTableStyle, "bad arg");
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if (nsnull==aTableStyle)
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return PR_FALSE;
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if (PR_TRUE==gsDebug)
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{
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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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// XXX Hey Cujo, result has never been initialized...
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return result;
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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()
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{
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if (gsDebug==PR_TRUE) printf ("** %p: AssignPreliminaryColumnWidths **\n", mTableFrame);
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PRInt32 colIndex;
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PRInt32 specifiedColumns=0; // the number of columns whose width is given
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nscoord totalWidth = 0; // the sum of the widths of the columns whose width is given
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PRBool * autoWidthColumns = new PRBool[mNumCols];
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nsCRT::memset(autoWidthColumns, PR_TRUE, mNumCols*sizeof(PRBool));
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// for every column, determine it's specified width
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for (colIndex = 0; colIndex<mNumCols; colIndex++)
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{
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// Get column information
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nsTableColFrame *colFrame = mTableFrame->GetColFrame(colIndex);
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NS_ASSERTION(nsnull!=colFrame, "bad col frame");
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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 fixed column width if it has one
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if (eStyleUnit_Coord==colPosition->mWidth.GetUnit())
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{
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nscoord colWidth = colPosition->mWidth.GetCoordValue();
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mTableFrame->SetColumnWidth(colIndex, colWidth);
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totalWidth += colWidth;
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specifiedColumns++;
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autoWidthColumns[colIndex]=PR_FALSE;
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if (PR_TRUE==gsDebug)
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printf ("from col, col %d set to width %d\n", colIndex, colWidth);
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}
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else
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{
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nsTableCellFrame *cellFrame = mTableFrame->GetCellFrameAt(0, colIndex);
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if (nsnull!=cellFrame)
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{
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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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// Get fixed column width if it has one
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if (eStyleUnit_Coord==cellPosition->mWidth.GetUnit())
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{
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PRInt32 colSpan = mTableFrame->GetEffectiveColSpan(colIndex, cellFrame);
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nscoord effectiveWidth = cellPosition->mWidth.GetCoordValue()/colSpan;
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mTableFrame->SetColumnWidth(colIndex, effectiveWidth);
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totalWidth += effectiveWidth;
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specifiedColumns++;
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autoWidthColumns[colIndex]=PR_FALSE;
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if (PR_TRUE==gsDebug)
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printf ("from cell, col %d set to width %d\n", colIndex, effectiveWidth);
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}
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}
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}
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}
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// for every column that did not have a specified width, compute its width from the remaining space
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if (mNumCols > specifiedColumns)
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{
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// Get the table's style
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const nsStylePosition* tablePosition;
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mTableFrame->GetStyleData(eStyleStruct_Position, (const nsStyleStruct*&)tablePosition);
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if (eStyleUnit_Coord==tablePosition->mWidth.GetUnit())
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{
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nscoord specifiedTableWidth = tablePosition->mWidth.GetCoordValue();
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nscoord remainingTableWidth = specifiedTableWidth - totalWidth;
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if (PR_TRUE==gsDebug)
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printf ("%p: specifiedTW=%d, remainingTW=%d\n",
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mTableFrame, specifiedTableWidth, remainingTableWidth);
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if (0<remainingTableWidth)
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{
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nscoord widthPerColumn = remainingTableWidth/(mNumCols-specifiedColumns);
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for (colIndex = 0; colIndex<mNumCols; colIndex++)
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{
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if (PR_TRUE==autoWidthColumns[colIndex])
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{
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mTableFrame->SetColumnWidth(colIndex, widthPerColumn);
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totalWidth += widthPerColumn;
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if (PR_TRUE==gsDebug)
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printf ("auto col %d set to width %d\n", colIndex, widthPerColumn);
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}
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}
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}
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}
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}
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// min/MaxTW is max of (specified table width, sum of specified column(cell) widths)
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mMinTableWidth = mMaxTableWidth = totalWidth;
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if (PR_TRUE==gsDebug)
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printf ("%p: aMinTW=%d, aMaxTW=%d\n", mTableFrame, mMinTableWidth, mMaxTableWidth);
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// clean up
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if (nsnull!=autoWidthColumns)
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{
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delete [] autoWidthColumns;
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}
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return PR_TRUE;
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}
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