pjs/layout/tables/FixedTableLayoutStrategy.h

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/* -*- 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.
*/
#ifndef FixedTableLayoutStrategy_h__
#define FixedTableLayoutStrategy_h__
#include "nscore.h"
#include "BasicTableLayoutStrategy.h"
#include "nsCoord.h"
class nsVoidArray;
class nsTableFrame;
struct nsStylePosition;
/* ---------- FixedTableLayoutStrategy ---------- */
/** Implementation of HTML4 "table-layout=fixed" table layout.
* The input to this class is the resolved styles for both the
* table columns and the cells in row0.
* The output from this class is to set the column widths in
* mTableFrame.
*/
class FixedTableLayoutStrategy : public BasicTableLayoutStrategy
{
public:
/** Public constructor.
* @paran aFrame the table frame for which this delegate will do layout
* @param aNumCols the total number of columns in the table
*/
FixedTableLayoutStrategy(nsTableFrame *aFrame);
/** destructor */
virtual ~FixedTableLayoutStrategy();
/** Called during resize reflow to determine the new column widths
* @param aTableStyle - the resolved style for mTableFrame
* @param aReflowState - the reflow state for mTableFrame
* @param aMaxWidth - the computed max width for columns to fit into
*/
virtual PRBool BalanceColumnWidths(nsIStyleContext* aTableStyle,
const nsHTMLReflowState& aReflowState,
nscoord aMaxWidth);
// see nsTableFrame::ColumnsCanBeInvalidatedBy
PRBool ColumnsCanBeInvalidatedBy(nsStyleCoord* aPrevStyleWidth,
const nsTableCellFrame& aCellFrame) const;
// see nsTableFrame::ColumnsCanBeInvalidatedBy
PRBool ColumnsCanBeInvalidatedBy(const nsTableCellFrame& aCellFrame,
PRBool aConsiderMinWidth = PR_FALSE) const;
// see nsTableFrame::ColumnsCanBeInvalidatedBy
PRBool ColumnsAreValidFor(const nsTableCellFrame& aCellFrame,
nscoord aPrevCellMin,
nscoord aPrevCellDes) const;
protected:
/* 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
* Computes the minimum and maximum table widths.
*
* Set column width information in each column frame and in the table frame.
*
* @return PR_TRUE if all is well, PR_FALSE if there was an unrecoverable error
*
*/
virtual PRBool AssignPreliminaryColumnWidths(nscoord aComputedWidth);
};
#endif