gecko-dev/layout/tables/BasicTableLayoutStrategy.h
2011-10-17 10:59:28 -04:00

113 lines
4.8 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// vim:cindent:ts=4:et:sw=4:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla's table layout code.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* 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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* Web-compatible algorithms that determine column and table widths,
* used for CSS2's 'table-layout: auto'.
*/
#ifndef BasicTableLayoutStrategy_h_
#define BasicTableLayoutStrategy_h_
#include "nsITableLayoutStrategy.h"
class nsTableFrame;
class BasicTableLayoutStrategy : public nsITableLayoutStrategy
{
public:
BasicTableLayoutStrategy(nsTableFrame *aTableFrame);
virtual ~BasicTableLayoutStrategy();
// nsITableLayoutStrategy implementation
virtual nscoord GetMinWidth(nsRenderingContext* aRenderingContext);
virtual nscoord GetPrefWidth(nsRenderingContext* aRenderingContext,
bool aComputingSize);
virtual void MarkIntrinsicWidthsDirty();
virtual void ComputeColumnWidths(const nsHTMLReflowState& aReflowState);
private:
// NOTE: Using prefix "BTLS" to avoid overlapping names with
// the values of nsLayoutUtils::IntrinsicWidthType
enum BtlsWidthType { BTLS_MIN_WIDTH,
BTLS_PREF_WIDTH,
BTLS_FINAL_WIDTH };
// Compute intrinsic width member variables on the columns.
void ComputeColumnIntrinsicWidths(nsRenderingContext* aRenderingContext);
// Distribute a colspanning cell's percent width (if any) to its columns.
void DistributePctWidthToColumns(float aSpanPrefPct,
PRInt32 aFirstCol,
PRInt32 aColCount);
// Distribute a width of some BltsWidthType type to a set of columns.
// aWidth: The amount of width to be distributed
// aFirstCol: The index (in the table) of the first column to be
// considered for receiving width
// aColCount: The number of consecutive columns (starting with aFirstCol)
// to be considered for receiving width
// aWidthType: The type of width being distributed. (BTLS_MIN_WIDTH and
// BTLS_PREF_WIDTH are intended to be used for dividing up
// colspan's min & pref width. BTLS_FINAL_WIDTH is intended
// to be used for distributing the table's final width across
// all its columns)
// aSpanHasSpecifiedWidth: Should be true iff:
// - We're distributing a colspanning cell's
// pref or min width to its columns
// - The colspanning cell has a specified width.
void DistributeWidthToColumns(nscoord aWidth,
PRInt32 aFirstCol,
PRInt32 aColCount,
BtlsWidthType aWidthType,
bool aSpanHasSpecifiedWidth);
// Compute the min and pref widths of the table from the width
// variables on the columns.
void ComputeIntrinsicWidths(nsRenderingContext* aRenderingContext);
nsTableFrame *mTableFrame;
nscoord mMinWidth;
nscoord mPrefWidth;
nscoord mPrefWidthPctExpand;
nscoord mLastCalcWidth;
};
#endif /* !defined(BasicTableLayoutStrategy_h_) */