зеркало из https://github.com/mozilla/pjs.git
1032 строки
42 KiB
C++
1032 строки
42 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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// vim:cindent:ts=4:et:sw=4:
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla's table layout code.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org> (original author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Web-compatible algorithms that determine column and table widths,
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* used for CSS2's 'table-layout: auto'.
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*/
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#include "BasicTableLayoutStrategy.h"
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#include "nsTableFrame.h"
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#include "nsTableCellFrame.h"
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#include "nsLayoutUtils.h"
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#include "nsGkAtoms.h"
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#include "SpanningCellSorter.h"
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#undef DEBUG_TABLE_STRATEGY
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BasicTableLayoutStrategy::BasicTableLayoutStrategy(nsTableFrame *aTableFrame)
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: nsITableLayoutStrategy(nsITableLayoutStrategy::Auto)
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, mTableFrame(aTableFrame)
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{
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MarkIntrinsicWidthsDirty();
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}
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/* virtual */
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BasicTableLayoutStrategy::~BasicTableLayoutStrategy()
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{
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}
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/* virtual */ nscoord
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BasicTableLayoutStrategy::GetMinWidth(nsIRenderingContext* aRenderingContext)
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{
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DISPLAY_MIN_WIDTH(mTableFrame, mMinWidth);
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if (mMinWidth == NS_INTRINSIC_WIDTH_UNKNOWN)
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ComputeIntrinsicWidths(aRenderingContext);
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return mMinWidth;
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}
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/* virtual */ nscoord
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BasicTableLayoutStrategy::GetPrefWidth(nsIRenderingContext* aRenderingContext,
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PRBool aComputingSize)
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{
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DISPLAY_PREF_WIDTH(mTableFrame, mPrefWidth);
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NS_ASSERTION((mPrefWidth == NS_INTRINSIC_WIDTH_UNKNOWN) ==
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(mPrefWidthPctExpand == NS_INTRINSIC_WIDTH_UNKNOWN),
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"dirtyness out of sync");
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if (mPrefWidth == NS_INTRINSIC_WIDTH_UNKNOWN)
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ComputeIntrinsicWidths(aRenderingContext);
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return aComputingSize ? mPrefWidthPctExpand : mPrefWidth;
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}
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struct CellWidthInfo {
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CellWidthInfo(nscoord aMinCoord, nscoord aPrefCoord,
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float aPrefPercent, PRBool aHasSpecifiedWidth)
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: hasSpecifiedWidth(aHasSpecifiedWidth)
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, minCoord(aMinCoord)
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, prefCoord(aPrefCoord)
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, prefPercent(aPrefPercent)
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{
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}
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PRBool hasSpecifiedWidth;
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nscoord minCoord;
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nscoord prefCoord;
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float prefPercent;
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};
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// Used for both column and cell calculations. The parts needed only
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// for cells are skipped when aIsCell is false.
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static CellWidthInfo
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GetWidthInfo(nsIRenderingContext *aRenderingContext,
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nsIFrame *aFrame, PRBool aIsCell)
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{
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nscoord minCoord, prefCoord;
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if (aIsCell) {
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minCoord = aFrame->GetMinWidth(aRenderingContext);
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prefCoord = aFrame->GetPrefWidth(aRenderingContext);
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} else {
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minCoord = 0;
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prefCoord = 0;
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}
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float prefPercent = 0.0f;
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PRBool hasSpecifiedWidth = PR_FALSE;
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// XXXldb Should we consider -moz-box-sizing?
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const nsStylePosition *stylePos = aFrame->GetStylePosition();
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nsStyleUnit unit = stylePos->mWidth.GetUnit();
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if (unit == eStyleUnit_Coord) {
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hasSpecifiedWidth = PR_TRUE;
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nscoord w = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
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aFrame, 0, 0, 0, stylePos->mWidth);
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// Quirk: A cell with "nowrap" set and a coord value for the
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// width which is bigger than the intrinsic minimum width uses
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// that coord value as the minimum width.
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// This is kept up-to-date with dynamic changes to nowrap by code in
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// nsTableCellFrame::AttributeChanged
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if (aIsCell && w > minCoord &&
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aFrame->PresContext()->CompatibilityMode() ==
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eCompatibility_NavQuirks &&
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aFrame->GetContent()->HasAttr(kNameSpaceID_None,
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nsGkAtoms::nowrap)) {
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minCoord = w;
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}
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prefCoord = PR_MAX(w, minCoord);
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} else if (unit == eStyleUnit_Percent) {
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prefPercent = stylePos->mWidth.GetPercentValue();
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} else if (unit == eStyleUnit_Enumerated && aIsCell) {
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switch (stylePos->mWidth.GetIntValue()) {
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case NS_STYLE_WIDTH_MAX_CONTENT:
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// 'width' only affects pref width, not min
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// width, so don't change anything
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break;
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case NS_STYLE_WIDTH_MIN_CONTENT:
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prefCoord = minCoord;
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break;
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case NS_STYLE_WIDTH_FIT_CONTENT:
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case NS_STYLE_WIDTH_AVAILABLE:
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// act just like 'width: auto'
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break;
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default:
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NS_NOTREACHED("unexpected enumerated value");
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}
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}
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nsStyleCoord maxWidth(stylePos->mMaxWidth);
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if (maxWidth.GetUnit() == eStyleUnit_Enumerated) {
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if (!aIsCell || maxWidth.GetIntValue() == NS_STYLE_WIDTH_AVAILABLE)
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maxWidth.SetNoneValue();
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else if (maxWidth.GetIntValue() == NS_STYLE_WIDTH_FIT_CONTENT)
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// for 'max-width', '-moz-fit-content' is like
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// '-moz-max-content'
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maxWidth.SetIntValue(NS_STYLE_WIDTH_MAX_CONTENT,
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eStyleUnit_Enumerated);
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}
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unit = maxWidth.GetUnit();
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// XXX To really implement 'max-width' well, we'd need to store
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// it separately on the columns.
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if (unit == eStyleUnit_Coord || unit == eStyleUnit_Enumerated) {
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nscoord w =
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nsLayoutUtils::ComputeWidthValue(aRenderingContext, aFrame,
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0, 0, 0, maxWidth);
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if (w < minCoord)
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minCoord = w;
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if (w < prefCoord)
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prefCoord = w;
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} else if (unit == eStyleUnit_Percent) {
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float p = stylePos->mMaxWidth.GetPercentValue();
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if (p < prefPercent)
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prefPercent = p;
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}
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nsStyleCoord minWidth(stylePos->mMinWidth);
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if (minWidth.GetUnit() == eStyleUnit_Enumerated) {
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if (!aIsCell || minWidth.GetIntValue() == NS_STYLE_WIDTH_AVAILABLE)
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minWidth.SetCoordValue(0);
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else if (minWidth.GetIntValue() == NS_STYLE_WIDTH_FIT_CONTENT)
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// for 'min-width', '-moz-fit-content' is like
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// '-moz-min-content'
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minWidth.SetIntValue(NS_STYLE_WIDTH_MIN_CONTENT,
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eStyleUnit_Enumerated);
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}
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unit = minWidth.GetUnit();
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if (unit == eStyleUnit_Coord || unit == eStyleUnit_Enumerated) {
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nscoord w =
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nsLayoutUtils::ComputeWidthValue(aRenderingContext, aFrame,
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0, 0, 0, minWidth);
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if (w > minCoord)
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minCoord = w;
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if (w > prefCoord)
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prefCoord = w;
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} else if (unit == eStyleUnit_Percent) {
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float p = stylePos->mMinWidth.GetPercentValue();
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if (p > prefPercent)
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prefPercent = p;
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}
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// XXX Should col frame have border/padding considered?
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if (aIsCell) {
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nsIFrame::IntrinsicWidthOffsetData offsets =
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aFrame->IntrinsicWidthOffsets(aRenderingContext);
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// XXX Should we ignore percentage padding?
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nscoord add = offsets.hPadding + offsets.hBorder;
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minCoord += add;
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prefCoord = NSCoordSaturatingAdd(prefCoord, add);
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}
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return CellWidthInfo(minCoord, prefCoord, prefPercent, hasSpecifiedWidth);
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}
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static inline CellWidthInfo
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GetCellWidthInfo(nsIRenderingContext *aRenderingContext,
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nsTableCellFrame *aCellFrame)
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{
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return GetWidthInfo(aRenderingContext, aCellFrame, PR_TRUE);
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}
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static inline CellWidthInfo
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GetColWidthInfo(nsIRenderingContext *aRenderingContext,
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nsIFrame *aFrame)
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{
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return GetWidthInfo(aRenderingContext, aFrame, PR_FALSE);
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}
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/**
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* The algorithm in this function, in addition to meeting the
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* requirements of Web-compatibility, is also invariant under reordering
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* of the rows within a table (something that most, but not all, other
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* browsers are).
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*/
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void
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BasicTableLayoutStrategy::ComputeColumnIntrinsicWidths(nsIRenderingContext* aRenderingContext)
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{
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nsTableFrame *tableFrame = mTableFrame;
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nsTableCellMap *cellMap = tableFrame->GetCellMap();
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SpanningCellSorter spanningCells(tableFrame->PresContext()->PresShell());
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// Loop over the columns to consider the columns and cells *without*
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// a colspan.
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PRInt32 col, col_end;
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for (col = 0, col_end = cellMap->GetColCount(); col < col_end; ++col) {
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nsTableColFrame *colFrame = tableFrame->GetColFrame(col);
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if (!colFrame) {
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NS_ERROR("column frames out of sync with cell map");
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continue;
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}
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colFrame->ResetIntrinsics();
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colFrame->ResetSpanIntrinsics();
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// Consider the widths on the column.
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CellWidthInfo colInfo = GetColWidthInfo(aRenderingContext, colFrame);
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colFrame->AddCoords(colInfo.minCoord, colInfo.prefCoord,
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colInfo.hasSpecifiedWidth);
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colFrame->AddPrefPercent(colInfo.prefPercent);
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// Consider the widths on the column-group. Note that we follow
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// what the HTML spec says here, and make the width apply to
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// each column in the group, not the group as a whole.
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// XXX Should we be doing this when we have widths on the column?
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NS_ASSERTION(colFrame->GetParent()->GetType() ==
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nsGkAtoms::tableColGroupFrame,
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"expected a column-group");
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colInfo = GetColWidthInfo(aRenderingContext, colFrame->GetParent());
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colFrame->AddCoords(colInfo.minCoord, colInfo.prefCoord,
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colInfo.hasSpecifiedWidth);
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colFrame->AddPrefPercent(colInfo.prefPercent);
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// Consider the contents of and the widths on the cells without
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// colspans.
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nsCellMapColumnIterator columnIter(cellMap, col);
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PRInt32 row, colSpan;
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nsTableCellFrame* cellFrame;
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while ((cellFrame = columnIter.GetNextFrame(&row, &colSpan))) {
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if (colSpan > 1) {
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spanningCells.AddCell(colSpan, row, col);
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continue;
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}
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CellWidthInfo info = GetCellWidthInfo(aRenderingContext, cellFrame);
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colFrame->AddCoords(info.minCoord, info.prefCoord,
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info.hasSpecifiedWidth);
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colFrame->AddPrefPercent(info.prefPercent);
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}
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#ifdef DEBUG_dbaron_off
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printf("table %p col %d nonspan: min=%d pref=%d spec=%d pct=%f\n",
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mTableFrame, col, colFrame->GetMinCoord(),
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colFrame->GetPrefCoord(), colFrame->GetHasSpecifiedCoord(),
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colFrame->GetPrefPercent());
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#endif
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}
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#ifdef DEBUG_TABLE_STRATEGY
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printf("ComputeColumnIntrinsicWidths single\n");
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mTableFrame->Dump(PR_FALSE, PR_TRUE, PR_FALSE);
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#endif
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// Consider the cells with a colspan that we saved in the loop above
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// into the spanning cell sorter. We consider these cells by seeing
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// if they require adding to the widths resulting only from cells
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// with a smaller colspan, and therefore we must process them sorted
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// in increasing order by colspan. For each colspan group, we
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// accumulate new values to accumulate in the column frame's Span*
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// members.
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//
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// Considering things only relative to the widths resulting from
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// cells with smaller colspans (rather than incrementally including
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// the results from spanning cells, or doing spanning and
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// non-spanning cells in a single pass) means that layout remains
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// row-order-invariant and (except for percentage widths that add to
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// more than 100%) column-order invariant.
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//
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// Starting with smaller colspans makes it more likely that we
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// satisfy all the constraints given and don't distribute space to
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// columns where we don't need it.
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SpanningCellSorter::Item *item;
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PRInt32 colSpan;
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while ((item = spanningCells.GetNext(&colSpan))) {
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NS_ASSERTION(colSpan > 1,
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"cell should not have been put in spanning cell sorter");
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do {
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PRInt32 row = item->row;
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col = item->col;
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CellData *cellData = cellMap->GetDataAt(row, col);
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NS_ASSERTION(cellData && cellData->IsOrig(),
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"bogus result from spanning cell sorter");
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nsTableCellFrame *cellFrame = cellData->GetCellFrame();
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NS_ASSERTION(cellFrame, "bogus result from spanning cell sorter");
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CellWidthInfo info = GetCellWidthInfo(aRenderingContext, cellFrame);
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if (info.prefPercent > 0.0f) {
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DistributePctWidthToColumns(info.prefPercent,
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col, colSpan);
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}
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DistributeWidthToColumns(info.minCoord, col, colSpan,
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BTLS_MIN_WIDTH, info.hasSpecifiedWidth);
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DistributeWidthToColumns(info.prefCoord, col, colSpan,
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BTLS_PREF_WIDTH, info.hasSpecifiedWidth);
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} while ((item = item->next));
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// Combine the results of the span analysis into the main results,
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// for each increment of colspan.
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for (col = 0, col_end = cellMap->GetColCount(); col < col_end; ++col) {
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nsTableColFrame *colFrame = tableFrame->GetColFrame(col);
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if (!colFrame) {
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NS_ERROR("column frames out of sync with cell map");
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continue;
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}
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colFrame->AccumulateSpanIntrinsics();
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colFrame->ResetSpanIntrinsics();
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#ifdef DEBUG_dbaron_off
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printf("table %p col %d span %d: min=%d pref=%d spec=%d pct=%f\n",
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mTableFrame, col, colSpan, colFrame->GetMinCoord(),
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colFrame->GetPrefCoord(), colFrame->GetHasSpecifiedCoord(),
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colFrame->GetPrefPercent());
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#endif
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}
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}
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// Prevent percentages from adding to more than 100% by (to be
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// compatible with other browsers) treating any percentages that would
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// increase the total percentage to more than 100% as the number that
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// would increase it to only 100% (which is 0% if we've already hit
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// 100%). This means layout depends on the order of columns.
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float pct_used = 0.0f;
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for (col = 0, col_end = cellMap->GetColCount(); col < col_end; ++col) {
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nsTableColFrame *colFrame = tableFrame->GetColFrame(col);
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if (!colFrame) {
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NS_ERROR("column frames out of sync with cell map");
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continue;
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}
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colFrame->AdjustPrefPercent(&pct_used);
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}
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#ifdef DEBUG_TABLE_STRATEGY
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printf("ComputeColumnIntrinsicWidths spanning\n");
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mTableFrame->Dump(PR_FALSE, PR_TRUE, PR_FALSE);
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#endif
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}
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void
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BasicTableLayoutStrategy::ComputeIntrinsicWidths(nsIRenderingContext* aRenderingContext)
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{
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ComputeColumnIntrinsicWidths(aRenderingContext);
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nsTableCellMap *cellMap = mTableFrame->GetCellMap();
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nscoord min = 0, pref = 0, max_small_pct_pref = 0, nonpct_pref_total = 0;
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float pct_total = 0.0f; // always from 0.0f - 1.0f
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PRInt32 colCount = cellMap->GetColCount();
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nscoord spacing = mTableFrame->GetCellSpacingX();
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nscoord add = spacing; // add (colcount + 1) * spacing for columns
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// where a cell originates
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for (PRInt32 col = 0; col < colCount; ++col) {
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nsTableColFrame *colFrame = mTableFrame->GetColFrame(col);
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if (!colFrame) {
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NS_ERROR("column frames out of sync with cell map");
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continue;
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}
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if (mTableFrame->ColumnHasCellSpacingBefore(col)) {
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add += spacing;
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}
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min += colFrame->GetMinCoord();
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pref = NSCoordSaturatingAdd(pref, colFrame->GetPrefCoord());
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// Percentages are of the table, so we have to reverse them for
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// intrinsic widths.
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float p = colFrame->GetPrefPercent();
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if (p > 0.0f) {
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nscoord colPref = colFrame->GetPrefCoord();
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nscoord new_small_pct_expand =
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(colPref == nscoord_MAX ?
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nscoord_MAX : nscoord(float(colPref) / p));
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if (new_small_pct_expand > max_small_pct_pref) {
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max_small_pct_pref = new_small_pct_expand;
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}
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pct_total += p;
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} else {
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nonpct_pref_total = NSCoordSaturatingAdd(nonpct_pref_total,
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colFrame->GetPrefCoord());
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}
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}
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nscoord pref_pct_expand = pref;
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// Account for small percentages expanding the preferred width of
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// *other* columns.
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if (max_small_pct_pref > pref_pct_expand) {
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pref_pct_expand = max_small_pct_pref;
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}
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// Account for large percentages expanding the preferred width of
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// themselves. There's no need to iterate over the columns multiple
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// times, since when there is such a need, the small percentage
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// effect is bigger anyway. (I think!)
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NS_ASSERTION(0.0f <= pct_total && pct_total <= 1.0f,
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"column percentage widths not adjusted down to 100%");
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if (pct_total == 1.0f) {
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if (nonpct_pref_total > 0) {
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pref_pct_expand = nscoord_MAX;
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// XXX Or should I use some smaller value? (Test this using
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// nested tables!)
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}
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} else {
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nscoord large_pct_pref =
|
|
(nonpct_pref_total == nscoord_MAX ?
|
|
nscoord_MAX :
|
|
nscoord(float(nonpct_pref_total) / (1.0f - pct_total)));
|
|
if (large_pct_pref > pref_pct_expand)
|
|
pref_pct_expand = large_pct_pref;
|
|
}
|
|
|
|
// border-spacing isn't part of the basis for percentages
|
|
if (colCount > 0) {
|
|
min += add;
|
|
pref = NSCoordSaturatingAdd(pref, add);
|
|
pref_pct_expand = NSCoordSaturatingAdd(pref_pct_expand, add);
|
|
}
|
|
|
|
mMinWidth = min;
|
|
mPrefWidth = pref;
|
|
mPrefWidthPctExpand = pref_pct_expand;
|
|
}
|
|
|
|
/* virtual */ void
|
|
BasicTableLayoutStrategy::MarkIntrinsicWidthsDirty()
|
|
{
|
|
mMinWidth = NS_INTRINSIC_WIDTH_UNKNOWN;
|
|
mPrefWidth = NS_INTRINSIC_WIDTH_UNKNOWN;
|
|
mPrefWidthPctExpand = NS_INTRINSIC_WIDTH_UNKNOWN;
|
|
mLastCalcWidth = nscoord_MIN;
|
|
}
|
|
|
|
/* virtual */ void
|
|
BasicTableLayoutStrategy::ComputeColumnWidths(const nsHTMLReflowState& aReflowState)
|
|
{
|
|
nscoord width = aReflowState.ComputedWidth();
|
|
|
|
if (mLastCalcWidth == width)
|
|
return;
|
|
mLastCalcWidth = width;
|
|
|
|
NS_ASSERTION((mMinWidth == NS_INTRINSIC_WIDTH_UNKNOWN) ==
|
|
(mPrefWidth == NS_INTRINSIC_WIDTH_UNKNOWN),
|
|
"dirtyness out of sync");
|
|
NS_ASSERTION((mMinWidth == NS_INTRINSIC_WIDTH_UNKNOWN) ==
|
|
(mPrefWidthPctExpand == NS_INTRINSIC_WIDTH_UNKNOWN),
|
|
"dirtyness out of sync");
|
|
// XXX Is this needed?
|
|
if (mMinWidth == NS_INTRINSIC_WIDTH_UNKNOWN)
|
|
ComputeIntrinsicWidths(aReflowState.rendContext);
|
|
|
|
nsTableCellMap *cellMap = mTableFrame->GetCellMap();
|
|
PRInt32 colCount = cellMap->GetColCount();
|
|
if (colCount <= 0)
|
|
return; // nothing to do
|
|
|
|
DistributeWidthToColumns(width, 0, colCount, BTLS_FINAL_WIDTH, PR_FALSE);
|
|
|
|
#ifdef DEBUG_TABLE_STRATEGY
|
|
printf("ComputeColumnWidths final\n");
|
|
mTableFrame->Dump(PR_FALSE, PR_TRUE, PR_FALSE);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
BasicTableLayoutStrategy::DistributePctWidthToColumns(float aSpanPrefPct,
|
|
PRInt32 aFirstCol,
|
|
PRInt32 aColCount)
|
|
{
|
|
// First loop to determine:
|
|
PRInt32 nonPctColCount = 0; // number of spanned columns without % width
|
|
nscoord nonPctTotalPrefWidth = 0; // total pref width of those columns
|
|
// and to reduce aSpanPrefPct by columns that already have % width
|
|
|
|
PRInt32 scol, scol_end;
|
|
for (scol = aFirstCol, scol_end = aFirstCol + aColCount;
|
|
scol < scol_end; ++scol) {
|
|
nsTableColFrame *scolFrame = mTableFrame->GetColFrame(scol);
|
|
if (!scolFrame) {
|
|
NS_ERROR("column frames out of sync with cell map");
|
|
continue;
|
|
}
|
|
float scolPct = scolFrame->GetPrefPercent();
|
|
if (scolPct == 0.0f) {
|
|
nonPctTotalPrefWidth += scolFrame->GetPrefCoord();
|
|
++nonPctColCount;
|
|
} else {
|
|
aSpanPrefPct -= scolPct;
|
|
}
|
|
}
|
|
|
|
if (aSpanPrefPct <= 0.0f || nonPctColCount == 0) {
|
|
// There's no %-width on the colspan left over to distribute,
|
|
// or there are no columns to which we could distribute %-width
|
|
return;
|
|
}
|
|
|
|
// Second loop, to distribute what remains of aSpanPrefPct
|
|
// between the non-percent-width spanned columns
|
|
const PRBool spanHasNonPctPref = nonPctTotalPrefWidth > 0; // Loop invariant
|
|
for (scol = aFirstCol, scol_end = aFirstCol + aColCount;
|
|
scol < scol_end; ++scol) {
|
|
nsTableColFrame *scolFrame = mTableFrame->GetColFrame(scol);
|
|
if (!scolFrame) {
|
|
NS_ERROR("column frames out of sync with cell map");
|
|
continue;
|
|
}
|
|
|
|
if (scolFrame->GetPrefPercent() == 0.0f) {
|
|
NS_ASSERTION((!spanHasNonPctPref ||
|
|
nonPctTotalPrefWidth != 0) &&
|
|
nonPctColCount != 0,
|
|
"should not be zero if we haven't allocated "
|
|
"all pref percent");
|
|
|
|
float allocatedPct; // % width to be given to this column
|
|
if (spanHasNonPctPref) {
|
|
// Group so we're multiplying by 1.0f when we need
|
|
// to use up aSpanPrefPct.
|
|
allocatedPct = aSpanPrefPct *
|
|
(float(scolFrame->GetPrefCoord()) /
|
|
float(nonPctTotalPrefWidth));
|
|
} else {
|
|
// distribute equally when all pref widths are 0
|
|
allocatedPct = aSpanPrefPct / float(nonPctColCount);
|
|
}
|
|
// Allocate the percent
|
|
scolFrame->AddSpanPrefPercent(allocatedPct);
|
|
|
|
// To avoid accumulating rounding error from division,
|
|
// subtract this column's values from the totals.
|
|
aSpanPrefPct -= allocatedPct;
|
|
nonPctTotalPrefWidth -= scolFrame->GetPrefCoord();
|
|
--nonPctColCount;
|
|
|
|
if (!aSpanPrefPct) {
|
|
// No more span-percent-width to distribute --> we're done.
|
|
NS_ASSERTION(spanHasNonPctPref ?
|
|
nonPctTotalPrefWidth == 0 :
|
|
nonPctColCount == 0,
|
|
"No more pct width to distribute, but there are "
|
|
"still cols that need some.");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
BasicTableLayoutStrategy::DistributeWidthToColumns(nscoord aWidth,
|
|
PRInt32 aFirstCol,
|
|
PRInt32 aColCount,
|
|
BtlsWidthType aWidthType,
|
|
PRBool aSpanHasSpecifiedWidth)
|
|
{
|
|
NS_ASSERTION(aWidthType != BTLS_FINAL_WIDTH ||
|
|
(aFirstCol == 0 &&
|
|
aColCount == mTableFrame->GetCellMap()->GetColCount()),
|
|
"Computing final column widths, but didn't get full column range");
|
|
|
|
// border-spacing isn't part of the basis for percentages.
|
|
nscoord spacing = mTableFrame->GetCellSpacingX();
|
|
nscoord subtract = 0;
|
|
// aWidth initially includes border-spacing for the boundaries in between
|
|
// each of the columns. We start at aFirstCol + 1 because the first
|
|
// in-between boundary would be at the left edge of column aFirstCol + 1
|
|
for (PRInt32 col = aFirstCol + 1; col < aFirstCol + aColCount; ++col) {
|
|
if (mTableFrame->ColumnHasCellSpacingBefore(col)) {
|
|
subtract += spacing;
|
|
}
|
|
}
|
|
if (aWidthType == BTLS_FINAL_WIDTH) {
|
|
// If we're computing final col-width, then aWidth initially includes
|
|
// border spacing on the table's far left + far right edge, too. Need
|
|
// to subtract those out, too.
|
|
subtract += spacing * 2;
|
|
}
|
|
aWidth = NSCoordSaturatingSubtract(aWidth, subtract, nscoord_MAX);
|
|
|
|
/*
|
|
* The goal of this function is to distribute |aWidth| between the
|
|
* columns by making an appropriate AddSpanCoords or SetFinalWidth
|
|
* call for each column. (We call AddSpanCoords if we're
|
|
* distributing a column-spanning cell's minimum or preferred width
|
|
* to its spanned columns. We call SetFinalWidth if we're
|
|
* distributing a table's final width to its columns.)
|
|
*
|
|
* The idea is to either assign one of the following sets of widths
|
|
* or a weighted average of two adjacent sets of widths. It is not
|
|
* possible to assign values smaller than the smallest set of
|
|
* widths. However, see below for handling the case of assigning
|
|
* values larger than the largest set of widths. From smallest to
|
|
* largest, these are:
|
|
*
|
|
* 1. [guess_min] Assign all columns their min width.
|
|
*
|
|
* 2. [guess_min_pct] Assign all columns with percentage widths
|
|
* their percentage width, and all other columns their min width.
|
|
*
|
|
* 3. [guess_min_spec] Assign all columns with percentage widths
|
|
* their percentage width, all columns with specified coordinate
|
|
* widths their pref width (since it doesn't matter whether it's the
|
|
* largest contributor to the pref width that was the specified
|
|
* contributor), and all other columns their min width.
|
|
*
|
|
* 4. [guess_pref] Assign all columns with percentage widths their
|
|
* specified width, and all other columns their pref width.
|
|
*
|
|
* If |aWidth| is *larger* than what we would assign in (4), then we
|
|
* expand the columns:
|
|
*
|
|
* a. if any columns without a specified coordinate width or
|
|
* percent width have nonzero pref width, in proportion to pref
|
|
* width [total_flex_pref]
|
|
*
|
|
* b. (NOTE: this case is for BTLS_FINAL_WIDTH only) otherwise, if
|
|
* any columns without a specified coordinate width or percent
|
|
* width, but with cells originating in them have zero pref width,
|
|
* equally between these [numNonSpecZeroWidthCols]
|
|
*
|
|
* c. otherwise, if any columns without percent width have nonzero
|
|
* pref width, in proportion to pref width [total_fixed_pref]
|
|
*
|
|
* d. otherwise, if any columns have nonzero percentage widths, in
|
|
* proportion to the percentage widths [total_pct]
|
|
*
|
|
* e. otherwise, equally.
|
|
*/
|
|
|
|
// Loop #1 over the columns, to figure out the four values above so
|
|
// we know which case we're dealing with.
|
|
|
|
nscoord guess_min = 0,
|
|
guess_min_pct = 0,
|
|
guess_min_spec = 0,
|
|
guess_pref = 0,
|
|
total_flex_pref = 0,
|
|
total_fixed_pref = 0;
|
|
float total_pct = 0.0f; // 0.0f to 1.0f
|
|
PRInt32 numInfiniteWidthCols = 0;
|
|
PRInt32 numNonSpecZeroWidthCols = 0;
|
|
|
|
PRInt32 col;
|
|
for (col = aFirstCol; col < aFirstCol + aColCount; ++col) {
|
|
nsTableColFrame *colFrame = mTableFrame->GetColFrame(col);
|
|
if (!colFrame) {
|
|
NS_ERROR("column frames out of sync with cell map");
|
|
continue;
|
|
}
|
|
nscoord min_width = colFrame->GetMinCoord();
|
|
guess_min += min_width;
|
|
if (colFrame->GetPrefPercent() != 0.0f) {
|
|
float pct = colFrame->GetPrefPercent();
|
|
total_pct += pct;
|
|
nscoord val = nscoord(float(aWidth) * pct);
|
|
if (val < min_width)
|
|
val = min_width;
|
|
guess_min_pct += val;
|
|
guess_pref = NSCoordSaturatingAdd(guess_pref, val);
|
|
} else {
|
|
nscoord pref_width = colFrame->GetPrefCoord();
|
|
if (pref_width == nscoord_MAX) {
|
|
++numInfiniteWidthCols;
|
|
}
|
|
guess_pref = NSCoordSaturatingAdd(guess_pref, pref_width);
|
|
guess_min_pct += min_width;
|
|
if (colFrame->GetHasSpecifiedCoord()) {
|
|
// we'll add on the rest of guess_min_spec outside the
|
|
// loop
|
|
nscoord delta = NSCoordSaturatingSubtract(pref_width,
|
|
min_width, 0);
|
|
guess_min_spec = NSCoordSaturatingAdd(guess_min_spec, delta);
|
|
total_fixed_pref = NSCoordSaturatingAdd(total_fixed_pref,
|
|
pref_width);
|
|
} else if (pref_width == 0) {
|
|
if (aWidthType == BTLS_FINAL_WIDTH &&
|
|
mTableFrame->ColumnHasCellSpacingBefore(col)) {
|
|
++numNonSpecZeroWidthCols;
|
|
}
|
|
} else {
|
|
total_flex_pref = NSCoordSaturatingAdd(total_flex_pref,
|
|
pref_width);
|
|
}
|
|
}
|
|
}
|
|
guess_min_spec = NSCoordSaturatingAdd(guess_min_spec, guess_min_pct);
|
|
|
|
// Determine what we're flexing:
|
|
enum Loop2Type {
|
|
FLEX_PCT_SMALL, // between (1) and (2) above
|
|
FLEX_FIXED_SMALL, // between (2) and (3) above
|
|
FLEX_FLEX_SMALL, // between (3) and (4) above
|
|
FLEX_FLEX_LARGE, // greater than (4) above, case (a)
|
|
FLEX_FLEX_LARGE_ZERO, // greater than (4) above, case (b)
|
|
FLEX_FIXED_LARGE, // greater than (4) above, case (c)
|
|
FLEX_PCT_LARGE, // greater than (4) above, case (d)
|
|
FLEX_ALL_LARGE // greater than (4) above, case (e)
|
|
};
|
|
|
|
Loop2Type l2t;
|
|
// These are constants (over columns) for each case's math. We use
|
|
// a pair of nscoords rather than a float so that we can subtract
|
|
// each column's allocation so we avoid accumulating rounding error.
|
|
nscoord space; // the amount of extra width to allocate
|
|
union {
|
|
nscoord c;
|
|
float f;
|
|
} basis; // the sum of the statistic over columns to divide it
|
|
if (aWidth < guess_pref) {
|
|
if (aWidthType != BTLS_FINAL_WIDTH && aWidth <= guess_min) {
|
|
// Return early -- we don't have any extra space to distribute.
|
|
return;
|
|
}
|
|
NS_ASSERTION(!(aWidthType == BTLS_FINAL_WIDTH && aWidth < guess_min),
|
|
"Table width is less than the "
|
|
"sum of its columns' min widths");
|
|
if (aWidth < guess_min_pct) {
|
|
l2t = FLEX_PCT_SMALL;
|
|
space = aWidth - guess_min;
|
|
basis.c = guess_min_pct - guess_min;
|
|
} else if (aWidth < guess_min_spec) {
|
|
l2t = FLEX_FIXED_SMALL;
|
|
space = aWidth - guess_min_pct;
|
|
basis.c = NSCoordSaturatingSubtract(guess_min_spec, guess_min_pct,
|
|
nscoord_MAX);
|
|
} else {
|
|
l2t = FLEX_FLEX_SMALL;
|
|
space = aWidth - guess_min_spec;
|
|
basis.c = NSCoordSaturatingSubtract(guess_pref, guess_min_spec,
|
|
nscoord_MAX);
|
|
}
|
|
} else {
|
|
space = NSCoordSaturatingSubtract(aWidth, guess_pref, nscoord_MAX);
|
|
if (total_flex_pref > 0) {
|
|
l2t = FLEX_FLEX_LARGE;
|
|
basis.c = total_flex_pref;
|
|
} else if (numNonSpecZeroWidthCols > 0) {
|
|
NS_ASSERTION(aWidthType == BTLS_FINAL_WIDTH,
|
|
"numNonSpecZeroWidthCols should only "
|
|
"be set when we're setting final width.");
|
|
l2t = FLEX_FLEX_LARGE_ZERO;
|
|
basis.c = numNonSpecZeroWidthCols;
|
|
} else if (total_fixed_pref > 0) {
|
|
l2t = FLEX_FIXED_LARGE;
|
|
basis.c = total_fixed_pref;
|
|
} else if (total_pct > 0.0f) {
|
|
l2t = FLEX_PCT_LARGE;
|
|
basis.f = total_pct;
|
|
} else {
|
|
l2t = FLEX_ALL_LARGE;
|
|
basis.c = aColCount;
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_dbaron_off
|
|
printf("ComputeColumnWidths: %d columns in width %d,\n"
|
|
" guesses=[%d,%d,%d,%d], totals=[%d,%d,%f],\n"
|
|
" l2t=%d, space=%d, basis.c=%d\n",
|
|
aColCount, aWidth,
|
|
guess_min, guess_min_pct, guess_min_spec, guess_pref,
|
|
total_flex_pref, total_fixed_pref, total_pct,
|
|
l2t, space, basis.c);
|
|
#endif
|
|
|
|
for (col = aFirstCol; col < aFirstCol + aColCount; ++col) {
|
|
nsTableColFrame *colFrame = mTableFrame->GetColFrame(col);
|
|
if (!colFrame) {
|
|
NS_ERROR("column frames out of sync with cell map");
|
|
continue;
|
|
}
|
|
nscoord col_width;
|
|
|
|
float pct = colFrame->GetPrefPercent();
|
|
if (pct != 0.0f) {
|
|
col_width = nscoord(float(aWidth) * pct);
|
|
nscoord col_min = colFrame->GetMinCoord();
|
|
if (col_width < col_min)
|
|
col_width = col_min;
|
|
} else {
|
|
col_width = colFrame->GetPrefCoord();
|
|
}
|
|
|
|
nscoord col_width_before_adjust = col_width;
|
|
|
|
switch (l2t) {
|
|
case FLEX_PCT_SMALL:
|
|
col_width = col_width_before_adjust = colFrame->GetMinCoord();
|
|
if (pct != 0.0f) {
|
|
nscoord pct_minus_min =
|
|
nscoord(float(aWidth) * pct) - col_width;
|
|
if (pct_minus_min > 0) {
|
|
float c = float(space) / float(basis.c);
|
|
basis.c -= pct_minus_min;
|
|
col_width += NSToCoordRound(float(pct_minus_min) * c);
|
|
}
|
|
}
|
|
break;
|
|
case FLEX_FIXED_SMALL:
|
|
if (pct == 0.0f) {
|
|
NS_ASSERTION(col_width == colFrame->GetPrefCoord(),
|
|
"wrong width assigned");
|
|
if (colFrame->GetHasSpecifiedCoord()) {
|
|
nscoord col_min = colFrame->GetMinCoord();
|
|
nscoord pref_minus_min = col_width - col_min;
|
|
col_width = col_width_before_adjust = col_min;
|
|
if (pref_minus_min != 0) {
|
|
float c = float(space) / float(basis.c);
|
|
basis.c -= pref_minus_min;
|
|
col_width += NSToCoordRound(
|
|
float(pref_minus_min) * c);
|
|
}
|
|
} else
|
|
col_width = col_width_before_adjust =
|
|
colFrame->GetMinCoord();
|
|
}
|
|
break;
|
|
case FLEX_FLEX_SMALL:
|
|
if (pct == 0.0f &&
|
|
!colFrame->GetHasSpecifiedCoord()) {
|
|
NS_ASSERTION(col_width == colFrame->GetPrefCoord(),
|
|
"wrong width assigned");
|
|
nscoord col_min = colFrame->GetMinCoord();
|
|
nscoord pref_minus_min =
|
|
NSCoordSaturatingSubtract(col_width, col_min, 0);
|
|
col_width = col_width_before_adjust = col_min;
|
|
if (pref_minus_min != 0) {
|
|
float c = float(space) / float(basis.c);
|
|
// If we have infinite-width cols, then the standard
|
|
// adjustment to col_width using 'c' won't work,
|
|
// because basis.c and pref_minus_min are both
|
|
// nscoord_MAX and will cancel each other out in the
|
|
// col_width adjustment (making us assign all the
|
|
// space to the first inf-width col). To correct for
|
|
// this, we'll also divide by numInfiniteWidthCols to
|
|
// spread the space equally among the inf-width cols.
|
|
if (numInfiniteWidthCols) {
|
|
if (colFrame->GetPrefCoord() == nscoord_MAX) {
|
|
c = c / float(numInfiniteWidthCols);
|
|
--numInfiniteWidthCols;
|
|
} else {
|
|
c = 0.0f;
|
|
}
|
|
}
|
|
basis.c = NSCoordSaturatingSubtract(basis.c,
|
|
pref_minus_min,
|
|
nscoord_MAX);
|
|
col_width += NSToCoordRound(
|
|
float(pref_minus_min) * c);
|
|
}
|
|
}
|
|
break;
|
|
case FLEX_FLEX_LARGE:
|
|
if (pct == 0.0f &&
|
|
!colFrame->GetHasSpecifiedCoord()) {
|
|
NS_ASSERTION(col_width == colFrame->GetPrefCoord(),
|
|
"wrong width assigned");
|
|
if (col_width != 0) {
|
|
if (space == nscoord_MAX) {
|
|
basis.c -= col_width;
|
|
col_width = nscoord_MAX;
|
|
} else {
|
|
float c = float(space) / float(basis.c);
|
|
basis.c -= col_width;
|
|
col_width += NSToCoordRound(float(col_width) * c);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case FLEX_FLEX_LARGE_ZERO:
|
|
NS_ASSERTION(aWidthType == BTLS_FINAL_WIDTH,
|
|
"FLEX_FLEX_LARGE_ZERO only should be hit "
|
|
"when we're setting final width.");
|
|
if (pct == 0.0f &&
|
|
!colFrame->GetHasSpecifiedCoord() &&
|
|
mTableFrame->ColumnHasCellSpacingBefore(col)) {
|
|
|
|
NS_ASSERTION(col_width == 0 &&
|
|
colFrame->GetPrefCoord() == 0,
|
|
"Since we're in FLEX_FLEX_LARGE_ZERO case, "
|
|
"all auto-width cols should have zero pref "
|
|
"width.");
|
|
float c = float(space) / float(basis.c);
|
|
col_width += NSToCoordRound(c);
|
|
--basis.c;
|
|
}
|
|
break;
|
|
case FLEX_FIXED_LARGE:
|
|
if (pct == 0.0f) {
|
|
NS_ASSERTION(col_width == colFrame->GetPrefCoord(),
|
|
"wrong width assigned");
|
|
NS_ASSERTION(colFrame->GetHasSpecifiedCoord() ||
|
|
colFrame->GetPrefCoord() == 0,
|
|
"wrong case");
|
|
if (col_width != 0) {
|
|
float c = float(space) / float(basis.c);
|
|
basis.c -= col_width;
|
|
col_width += NSToCoordRound(float(col_width) * c);
|
|
}
|
|
}
|
|
break;
|
|
case FLEX_PCT_LARGE:
|
|
NS_ASSERTION(pct != 0.0f || colFrame->GetPrefCoord() == 0,
|
|
"wrong case");
|
|
if (pct != 0.0f) {
|
|
float c = float(space) / basis.f;
|
|
col_width += NSToCoordRound(pct * c);
|
|
basis.f -= pct;
|
|
}
|
|
break;
|
|
case FLEX_ALL_LARGE:
|
|
{
|
|
float c = float(space) / float(basis.c);
|
|
col_width += NSToCoordRound(c);
|
|
--basis.c;
|
|
}
|
|
break;
|
|
}
|
|
|
|
// Only subtract from space if it's a real number.
|
|
if (space != nscoord_MAX) {
|
|
NS_ASSERTION(col_width != nscoord_MAX,
|
|
"How is col_width nscoord_MAX if space isn't?");
|
|
NS_ASSERTION(col_width_before_adjust != nscoord_MAX,
|
|
"How is col_width_before_adjust nscoord_MAX if space isn't?");
|
|
space -= col_width - col_width_before_adjust;
|
|
}
|
|
|
|
NS_ASSERTION(col_width >= colFrame->GetMinCoord(),
|
|
"assigned width smaller than min");
|
|
|
|
// Apply the new width
|
|
switch (aWidthType) {
|
|
case BTLS_MIN_WIDTH:
|
|
{
|
|
// Note: AddSpanCoords requires both a min and pref width.
|
|
// For the pref width, we'll just pass in our computed
|
|
// min width, because the real pref width will be at least
|
|
// as big
|
|
colFrame->AddSpanCoords(col_width, col_width,
|
|
aSpanHasSpecifiedWidth);
|
|
}
|
|
break;
|
|
case BTLS_PREF_WIDTH:
|
|
{
|
|
// Note: AddSpanCoords requires both a min and pref width.
|
|
// For the min width, we'll just pass in 0, because
|
|
// the real min width will be at least 0
|
|
colFrame->AddSpanCoords(0, col_width,
|
|
aSpanHasSpecifiedWidth);
|
|
}
|
|
break;
|
|
case BTLS_FINAL_WIDTH:
|
|
{
|
|
nscoord old_final = colFrame->GetFinalWidth();
|
|
colFrame->SetFinalWidth(col_width);
|
|
|
|
if (old_final != col_width)
|
|
mTableFrame->DidResizeColumns();
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
NS_ASSERTION((space == 0 || space == nscoord_MAX) &&
|
|
((l2t == FLEX_PCT_LARGE)
|
|
? (-0.001f < basis.f && basis.f < 0.001f)
|
|
: (basis.c == 0 || basis.c == nscoord_MAX)),
|
|
"didn't subtract all that we added");
|
|
}
|