зеркало из https://github.com/mozilla/gecko-dev.git
992 строки
38 KiB
C++
992 строки
38 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 <algorithm>
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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 "nsLayoutUtils.h"
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#include "nsGkAtoms.h"
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#include "SpanningCellSorter.h"
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#include "nsIContent.h"
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using namespace mozilla;
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using namespace mozilla::layout;
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namespace css = mozilla::css;
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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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MarkIntrinsicISizesDirty();
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}
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/* virtual */
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BasicTableLayoutStrategy::~BasicTableLayoutStrategy() {}
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/* virtual */
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nscoord BasicTableLayoutStrategy::GetMinISize(gfxContext *aRenderingContext) {
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DISPLAY_MIN_INLINE_SIZE(mTableFrame, mMinISize);
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if (mMinISize == NS_INTRINSIC_WIDTH_UNKNOWN) {
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ComputeIntrinsicISizes(aRenderingContext);
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}
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return mMinISize;
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}
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/* virtual */
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nscoord BasicTableLayoutStrategy::GetPrefISize(gfxContext *aRenderingContext,
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bool aComputingSize) {
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DISPLAY_PREF_INLINE_SIZE(mTableFrame, mPrefISize);
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NS_ASSERTION((mPrefISize == NS_INTRINSIC_WIDTH_UNKNOWN) ==
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(mPrefISizePctExpand == NS_INTRINSIC_WIDTH_UNKNOWN),
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"dirtyness out of sync");
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if (mPrefISize == NS_INTRINSIC_WIDTH_UNKNOWN) {
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ComputeIntrinsicISizes(aRenderingContext);
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}
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return aComputingSize ? mPrefISizePctExpand : mPrefISize;
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}
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struct CellISizeInfo {
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CellISizeInfo(nscoord aMinCoord, nscoord aPrefCoord, float aPrefPercent,
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bool aHasSpecifiedISize)
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: hasSpecifiedISize(aHasSpecifiedISize),
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minCoord(aMinCoord),
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prefCoord(aPrefCoord),
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prefPercent(aPrefPercent) {}
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bool hasSpecifiedISize;
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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 CellISizeInfo GetISizeInfo(gfxContext *aRenderingContext,
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nsIFrame *aFrame, WritingMode aWM,
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bool aIsCell) {
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nscoord minCoord, prefCoord;
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const nsStylePosition *stylePos = aFrame->StylePosition();
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bool isQuirks =
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aFrame->PresContext()->CompatibilityMode() == eCompatibility_NavQuirks;
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nscoord boxSizingToBorderEdge = 0;
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if (aIsCell) {
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// If aFrame is a container for font size inflation, then shrink
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// wrapping inside of it should not apply font size inflation.
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AutoMaybeDisableFontInflation an(aFrame);
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minCoord = aFrame->GetMinISize(aRenderingContext);
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prefCoord = aFrame->GetPrefISize(aRenderingContext);
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// Until almost the end of this function, minCoord and prefCoord
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// represent the box-sizing based isize values (which mean they
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// should include inline padding and border width when
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// box-sizing is set to border-box).
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// Note that this function returns border-box isize, we add the
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// outer edges near the end of this function.
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// XXX Should we ignore percentage padding?
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nsIFrame::IntrinsicISizeOffsetData offsets =
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aFrame->IntrinsicISizeOffsets();
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// In quirks mode, table cell isize should be content-box,
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// but bsize should be border box.
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// Because of this historic anomaly, we do not use quirk.css.
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// (We can't specify one value of box-sizing for isize and another
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// for bsize).
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// For this reason, we also do not use box-sizing for just one of
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// them, as this may be confusing.
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if (isQuirks || stylePos->mBoxSizing == StyleBoxSizing::Content) {
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boxSizingToBorderEdge = offsets.hPadding + offsets.hBorder;
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} else {
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// StyleBoxSizing::Border and standards-mode
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minCoord += offsets.hPadding + offsets.hBorder;
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prefCoord += offsets.hPadding + offsets.hBorder;
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}
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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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bool hasSpecifiedISize = false;
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const auto &iSize = stylePos->ISize(aWM);
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// NOTE: We're ignoring calc() units with both lengths and percentages here,
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// for lack of a sensible idea for what to do with them. This means calc()
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// with percentages is basically handled like 'auto' for table cells and
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// columns.
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if (iSize.ConvertsToLength()) {
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hasSpecifiedISize = true;
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// Note: since ComputeISizeValue was designed to return content-box
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// isize, it will (in some cases) subtract the box-sizing edges.
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// We prevent this unwanted behavior by calling it with
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// aContentEdgeToBoxSizing and aBoxSizingToMarginEdge set to 0.
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nscoord c = aFrame->ComputeISizeValue(aRenderingContext, 0, 0, 0, iSize);
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// Quirk: A cell with "nowrap" set and a coord value for the
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// isize which is bigger than the intrinsic minimum isize uses
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// that coord value as the minimum isize.
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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 && c > minCoord && isQuirks &&
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aFrame->GetContent()->AsElement()->HasAttr(kNameSpaceID_None,
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nsGkAtoms::nowrap)) {
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minCoord = c;
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}
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prefCoord = std::max(c, minCoord);
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} else if (iSize.ConvertsToPercentage()) {
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prefPercent = iSize.ToPercentage();
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} else if (iSize.IsExtremumLength() && aIsCell) {
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switch (iSize.AsExtremumLength()) {
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case StyleExtremumLength::MaxContent:
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// 'inline-size' only affects pref isize, not min
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// isize, so don't change anything
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break;
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case StyleExtremumLength::MinContent:
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prefCoord = minCoord;
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break;
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case StyleExtremumLength::MozFitContent:
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case StyleExtremumLength::MozAvailable:
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break;
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default:
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MOZ_ASSERT_UNREACHABLE("unexpected enumerated value");
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}
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}
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StyleMaxSize maxISize = stylePos->MaxISize(aWM);
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if (maxISize.IsExtremumLength()) {
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if (!aIsCell ||
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maxISize.AsExtremumLength() == StyleExtremumLength::MozAvailable) {
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maxISize = StyleMaxSize::None();
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} else if (maxISize.AsExtremumLength() ==
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StyleExtremumLength::MozFitContent) {
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// for 'max-inline-size', '-moz-fit-content' is like 'max-content'
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maxISize = StyleMaxSize::ExtremumLength(StyleExtremumLength::MaxContent);
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}
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}
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// XXX To really implement 'max-inline-size' well, we'd need to store
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// it separately on the columns.
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if (maxISize.ConvertsToLength() || maxISize.IsExtremumLength()) {
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nscoord c = aFrame->ComputeISizeValue(aRenderingContext, 0, 0, 0, maxISize);
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minCoord = std::min(c, minCoord);
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prefCoord = std::min(c, prefCoord);
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} else if (maxISize.ConvertsToPercentage()) {
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float p = maxISize.ToPercentage();
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if (p < prefPercent) {
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prefPercent = p;
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}
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}
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StyleSize minISize = stylePos->MinISize(aWM);
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if (minISize.IsExtremumLength()) {
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if (!aIsCell ||
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minISize.AsExtremumLength() == StyleExtremumLength::MozAvailable) {
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minISize = StyleSize::LengthPercentage(LengthPercentage::Zero());
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} else if (minISize.AsExtremumLength() ==
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StyleExtremumLength::MozFitContent) {
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// for 'min-inline-size', '-moz-fit-content' is like 'min-content'
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minISize = StyleSize::ExtremumLength(StyleExtremumLength::MinContent);
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}
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}
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if (minISize.ConvertsToLength() || minISize.IsExtremumLength()) {
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nscoord c = aFrame->ComputeISizeValue(aRenderingContext, 0, 0, 0, minISize);
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minCoord = std::max(c, minCoord);
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prefCoord = std::max(c, prefCoord);
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} else if (minISize.ConvertsToPercentage()) {
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float p = minISize.ToPercentage();
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if (p > prefPercent) {
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prefPercent = p;
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}
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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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minCoord += boxSizingToBorderEdge;
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prefCoord = NSCoordSaturatingAdd(prefCoord, boxSizingToBorderEdge);
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}
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return CellISizeInfo(minCoord, prefCoord, prefPercent, hasSpecifiedISize);
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}
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static inline CellISizeInfo GetCellISizeInfo(gfxContext *aRenderingContext,
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nsTableCellFrame *aCellFrame,
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WritingMode aWM) {
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return GetISizeInfo(aRenderingContext, aCellFrame, aWM, true);
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}
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static inline CellISizeInfo GetColISizeInfo(gfxContext *aRenderingContext,
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nsIFrame *aFrame, WritingMode aWM) {
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return GetISizeInfo(aRenderingContext, aFrame, aWM, 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 BasicTableLayoutStrategy::ComputeColumnIntrinsicISizes(
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gfxContext *aRenderingContext) {
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nsTableFrame *tableFrame = mTableFrame;
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nsTableCellMap *cellMap = tableFrame->GetCellMap();
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WritingMode wm = tableFrame->GetWritingMode();
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mozilla::AutoStackArena arena;
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SpanningCellSorter spanningCells;
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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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int32_t 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 isizes on the column.
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CellISizeInfo colInfo = GetColISizeInfo(aRenderingContext, colFrame, wm);
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colFrame->AddCoords(colInfo.minCoord, colInfo.prefCoord,
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colInfo.hasSpecifiedISize);
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colFrame->AddPrefPercent(colInfo.prefPercent);
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// Consider the isizes on the column-group. Note that we follow
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// what the HTML spec says here, and make the isize apply to
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// each column in the group, not the group as a whole.
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// If column has isize, column-group doesn't override isize.
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if (colInfo.minCoord == 0 && colInfo.prefCoord == 0 &&
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colInfo.prefPercent == 0.0f) {
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NS_ASSERTION(colFrame->GetParent()->IsTableColGroupFrame(),
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"expected a column-group");
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colInfo = GetColISizeInfo(aRenderingContext, colFrame->GetParent(), wm);
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colFrame->AddCoords(colInfo.minCoord, colInfo.prefCoord,
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colInfo.hasSpecifiedISize);
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colFrame->AddPrefPercent(colInfo.prefPercent);
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}
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// Consider the contents of and the isizes on the cells without
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// colspans.
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nsCellMapColumnIterator columnIter(cellMap, col);
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int32_t 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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CellISizeInfo info = GetCellISizeInfo(aRenderingContext, cellFrame, wm);
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colFrame->AddCoords(info.minCoord, info.prefCoord,
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info.hasSpecifiedISize);
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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(), colFrame->GetPrefCoord(),
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colFrame->GetHasSpecifiedCoord(), colFrame->GetPrefPercent());
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#endif
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}
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#ifdef DEBUG_TABLE_STRATEGY
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printf("ComputeColumnIntrinsicISizes single\n");
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mTableFrame->Dump(false, true, 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 isizes 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 isizes 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 isizes 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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int32_t 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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int32_t 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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CellISizeInfo info = GetCellISizeInfo(aRenderingContext, cellFrame, wm);
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if (info.prefPercent > 0.0f) {
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DistributePctISizeToColumns(info.prefPercent, col, colSpan);
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}
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DistributeISizeToColumns(info.minCoord, col, colSpan, BTLS_MIN_ISIZE,
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info.hasSpecifiedISize);
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DistributeISizeToColumns(info.prefCoord, col, colSpan, BTLS_PREF_ISIZE,
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info.hasSpecifiedISize);
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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("ComputeColumnIntrinsicISizes spanning\n");
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mTableFrame->Dump(false, true, false);
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#endif
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}
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void BasicTableLayoutStrategy::ComputeIntrinsicISizes(
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gfxContext *aRenderingContext) {
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ComputeColumnIntrinsicISizes(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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int32_t colCount = cellMap->GetColCount();
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// add a total of (colcount + 1) lots of cellSpacingX for columns where a
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// cell originates
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nscoord add = mTableFrame->GetColSpacing(colCount);
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for (int32_t 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 += mTableFrame->GetColSpacing(col - 1);
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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 isizes.
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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 ? 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 =
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NSCoordSaturatingAdd(nonpct_pref_total, 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 isize 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 isize 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 inline-sizes not adjusted down to 100%");
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if (pct_total == 1.0f) {
|
|
if (nonpct_pref_total > 0) {
|
|
pref_pct_expand = nscoord_MAX;
|
|
// XXX Or should I use some smaller value? (Test this using
|
|
// nested tables!)
|
|
}
|
|
} else {
|
|
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);
|
|
}
|
|
|
|
mMinISize = min;
|
|
mPrefISize = pref;
|
|
mPrefISizePctExpand = pref_pct_expand;
|
|
}
|
|
|
|
/* virtual */
|
|
void BasicTableLayoutStrategy::MarkIntrinsicISizesDirty() {
|
|
mMinISize = NS_INTRINSIC_WIDTH_UNKNOWN;
|
|
mPrefISize = NS_INTRINSIC_WIDTH_UNKNOWN;
|
|
mPrefISizePctExpand = NS_INTRINSIC_WIDTH_UNKNOWN;
|
|
mLastCalcISize = nscoord_MIN;
|
|
}
|
|
|
|
/* virtual */
|
|
void BasicTableLayoutStrategy::ComputeColumnISizes(
|
|
const ReflowInput &aReflowInput) {
|
|
nscoord iSize = aReflowInput.ComputedISize();
|
|
|
|
if (mLastCalcISize == iSize) {
|
|
return;
|
|
}
|
|
mLastCalcISize = iSize;
|
|
|
|
NS_ASSERTION((mMinISize == NS_INTRINSIC_WIDTH_UNKNOWN) ==
|
|
(mPrefISize == NS_INTRINSIC_WIDTH_UNKNOWN),
|
|
"dirtyness out of sync");
|
|
NS_ASSERTION((mMinISize == NS_INTRINSIC_WIDTH_UNKNOWN) ==
|
|
(mPrefISizePctExpand == NS_INTRINSIC_WIDTH_UNKNOWN),
|
|
"dirtyness out of sync");
|
|
// XXX Is this needed?
|
|
if (mMinISize == NS_INTRINSIC_WIDTH_UNKNOWN) {
|
|
ComputeIntrinsicISizes(aReflowInput.mRenderingContext);
|
|
}
|
|
|
|
nsTableCellMap *cellMap = mTableFrame->GetCellMap();
|
|
int32_t colCount = cellMap->GetColCount();
|
|
if (colCount <= 0) return; // nothing to do
|
|
|
|
DistributeISizeToColumns(iSize, 0, colCount, BTLS_FINAL_ISIZE, false);
|
|
|
|
#ifdef DEBUG_TABLE_STRATEGY
|
|
printf("ComputeColumnISizes final\n");
|
|
mTableFrame->Dump(false, true, false);
|
|
#endif
|
|
}
|
|
|
|
void BasicTableLayoutStrategy::DistributePctISizeToColumns(float aSpanPrefPct,
|
|
int32_t aFirstCol,
|
|
int32_t aColCount) {
|
|
// First loop to determine:
|
|
int32_t nonPctColCount = 0; // number of spanned columns without % isize
|
|
nscoord nonPctTotalPrefISize = 0; // total pref isize of those columns
|
|
// and to reduce aSpanPrefPct by columns that already have % isize
|
|
|
|
int32_t scol, scol_end;
|
|
nsTableCellMap *cellMap = mTableFrame->GetCellMap();
|
|
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) {
|
|
nonPctTotalPrefISize += scolFrame->GetPrefCoord();
|
|
if (cellMap->GetNumCellsOriginatingInCol(scol) > 0) {
|
|
++nonPctColCount;
|
|
}
|
|
} else {
|
|
aSpanPrefPct -= scolPct;
|
|
}
|
|
}
|
|
|
|
if (aSpanPrefPct <= 0.0f || nonPctColCount == 0) {
|
|
// There's no %-isize on the colspan left over to distribute,
|
|
// or there are no columns to which we could distribute %-isize
|
|
return;
|
|
}
|
|
|
|
// Second loop, to distribute what remains of aSpanPrefPct
|
|
// between the non-percent-isize spanned columns
|
|
const bool spanHasNonPctPref = nonPctTotalPrefISize > 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 || nonPctTotalPrefISize != 0) &&
|
|
nonPctColCount != 0,
|
|
"should not be zero if we haven't allocated "
|
|
"all pref percent");
|
|
|
|
float allocatedPct; // % isize 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(nonPctTotalPrefISize));
|
|
} else if (cellMap->GetNumCellsOriginatingInCol(scol) > 0) {
|
|
// distribute equally when all pref isizes are 0
|
|
allocatedPct = aSpanPrefPct / float(nonPctColCount);
|
|
} else {
|
|
allocatedPct = 0.0f;
|
|
}
|
|
// Allocate the percent
|
|
scolFrame->AddSpanPrefPercent(allocatedPct);
|
|
|
|
// To avoid accumulating rounding error from division,
|
|
// subtract this column's values from the totals.
|
|
aSpanPrefPct -= allocatedPct;
|
|
nonPctTotalPrefISize -= scolFrame->GetPrefCoord();
|
|
if (cellMap->GetNumCellsOriginatingInCol(scol) > 0) {
|
|
--nonPctColCount;
|
|
}
|
|
|
|
if (!aSpanPrefPct) {
|
|
// No more span-percent-isize to distribute --> we're done.
|
|
NS_ASSERTION(
|
|
spanHasNonPctPref ? nonPctTotalPrefISize == 0 : nonPctColCount == 0,
|
|
"No more pct inline-size to distribute, "
|
|
"but there are still cols that need some.");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void BasicTableLayoutStrategy::DistributeISizeToColumns(
|
|
nscoord aISize, int32_t aFirstCol, int32_t aColCount,
|
|
BtlsISizeType aISizeType, bool aSpanHasSpecifiedISize) {
|
|
NS_ASSERTION(
|
|
aISizeType != BTLS_FINAL_ISIZE ||
|
|
(aFirstCol == 0 &&
|
|
aColCount == mTableFrame->GetCellMap()->GetColCount()),
|
|
"Computing final column isizes, but didn't get full column range");
|
|
|
|
nscoord subtract = 0;
|
|
// aISize 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 (int32_t col = aFirstCol + 1; col < aFirstCol + aColCount; ++col) {
|
|
if (mTableFrame->ColumnHasCellSpacingBefore(col)) {
|
|
// border-spacing isn't part of the basis for percentages.
|
|
subtract += mTableFrame->GetColSpacing(col - 1);
|
|
}
|
|
}
|
|
if (aISizeType == BTLS_FINAL_ISIZE) {
|
|
// If we're computing final col-isize, then aISize initially includes
|
|
// border spacing on the table's far istart + far iend edge, too. Need
|
|
// to subtract those out, too.
|
|
subtract += (mTableFrame->GetColSpacing(-1) +
|
|
mTableFrame->GetColSpacing(aColCount));
|
|
}
|
|
aISize = NSCoordSaturatingSubtract(aISize, subtract, nscoord_MAX);
|
|
|
|
/*
|
|
* The goal of this function is to distribute |aISize| between the
|
|
* columns by making an appropriate AddSpanCoords or SetFinalISize
|
|
* call for each column. (We call AddSpanCoords if we're
|
|
* distributing a column-spanning cell's minimum or preferred isize
|
|
* to its spanned columns. We call SetFinalISize if we're
|
|
* distributing a table's final isize to its columns.)
|
|
*
|
|
* The idea is to either assign one of the following sets of isizes
|
|
* or a weighted average of two adjacent sets of isizes. It is not
|
|
* possible to assign values smaller than the smallest set of
|
|
* isizes. However, see below for handling the case of assigning
|
|
* values larger than the largest set of isizes. From smallest to
|
|
* largest, these are:
|
|
*
|
|
* 1. [guess_min] Assign all columns their min isize.
|
|
*
|
|
* 2. [guess_min_pct] Assign all columns with percentage isizes
|
|
* their percentage isize, and all other columns their min isize.
|
|
*
|
|
* 3. [guess_min_spec] Assign all columns with percentage isizes
|
|
* their percentage isize, all columns with specified coordinate
|
|
* isizes their pref isize (since it doesn't matter whether it's the
|
|
* largest contributor to the pref isize that was the specified
|
|
* contributor), and all other columns their min isize.
|
|
*
|
|
* 4. [guess_pref] Assign all columns with percentage isizes their
|
|
* specified isize, and all other columns their pref isize.
|
|
*
|
|
* If |aISize| is *larger* than what we would assign in (4), then we
|
|
* expand the columns:
|
|
*
|
|
* a. if any columns without a specified coordinate isize or
|
|
* percent isize have nonzero pref isize, in proportion to pref
|
|
* isize [total_flex_pref]
|
|
*
|
|
* b. otherwise, if any columns without a specified coordinate
|
|
* isize or percent isize, but with cells originating in them,
|
|
* have zero pref isize, equally between these
|
|
* [numNonSpecZeroISizeCols]
|
|
*
|
|
* c. otherwise, if any columns without percent isize have nonzero
|
|
* pref isize, in proportion to pref isize [total_fixed_pref]
|
|
*
|
|
* d. otherwise, if any columns have nonzero percentage isizes, in
|
|
* proportion to the percentage isizes [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
|
|
int32_t numInfiniteISizeCols = 0;
|
|
int32_t numNonSpecZeroISizeCols = 0;
|
|
|
|
int32_t col;
|
|
nsTableCellMap *cellMap = mTableFrame->GetCellMap();
|
|
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_iSize = colFrame->GetMinCoord();
|
|
guess_min += min_iSize;
|
|
if (colFrame->GetPrefPercent() != 0.0f) {
|
|
float pct = colFrame->GetPrefPercent();
|
|
total_pct += pct;
|
|
nscoord val = nscoord(float(aISize) * pct);
|
|
if (val < min_iSize) {
|
|
val = min_iSize;
|
|
}
|
|
guess_min_pct += val;
|
|
guess_pref = NSCoordSaturatingAdd(guess_pref, val);
|
|
} else {
|
|
nscoord pref_iSize = colFrame->GetPrefCoord();
|
|
if (pref_iSize == nscoord_MAX) {
|
|
++numInfiniteISizeCols;
|
|
}
|
|
guess_pref = NSCoordSaturatingAdd(guess_pref, pref_iSize);
|
|
guess_min_pct += min_iSize;
|
|
if (colFrame->GetHasSpecifiedCoord()) {
|
|
// we'll add on the rest of guess_min_spec outside the
|
|
// loop
|
|
nscoord delta = NSCoordSaturatingSubtract(pref_iSize, min_iSize, 0);
|
|
guess_min_spec = NSCoordSaturatingAdd(guess_min_spec, delta);
|
|
total_fixed_pref = NSCoordSaturatingAdd(total_fixed_pref, pref_iSize);
|
|
} else if (pref_iSize == 0) {
|
|
if (cellMap->GetNumCellsOriginatingInCol(col) > 0) {
|
|
++numNonSpecZeroISizeCols;
|
|
}
|
|
} else {
|
|
total_flex_pref = NSCoordSaturatingAdd(total_flex_pref, pref_iSize);
|
|
}
|
|
}
|
|
}
|
|
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 isize to allocate
|
|
union {
|
|
nscoord c;
|
|
float f;
|
|
} basis; // the sum of the statistic over columns to divide it
|
|
if (aISize < guess_pref) {
|
|
if (aISizeType != BTLS_FINAL_ISIZE && aISize <= guess_min) {
|
|
// Return early -- we don't have any extra space to distribute.
|
|
return;
|
|
}
|
|
NS_ASSERTION(!(aISizeType == BTLS_FINAL_ISIZE && aISize < guess_min),
|
|
"Table inline-size is less than the "
|
|
"sum of its columns' min inline-sizes");
|
|
if (aISize < guess_min_pct) {
|
|
l2t = FLEX_PCT_SMALL;
|
|
space = aISize - guess_min;
|
|
basis.c = guess_min_pct - guess_min;
|
|
} else if (aISize < guess_min_spec) {
|
|
l2t = FLEX_FIXED_SMALL;
|
|
space = aISize - guess_min_pct;
|
|
basis.c =
|
|
NSCoordSaturatingSubtract(guess_min_spec, guess_min_pct, nscoord_MAX);
|
|
} else {
|
|
l2t = FLEX_FLEX_SMALL;
|
|
space = aISize - guess_min_spec;
|
|
basis.c =
|
|
NSCoordSaturatingSubtract(guess_pref, guess_min_spec, nscoord_MAX);
|
|
}
|
|
} else {
|
|
space = NSCoordSaturatingSubtract(aISize, guess_pref, nscoord_MAX);
|
|
if (total_flex_pref > 0) {
|
|
l2t = FLEX_FLEX_LARGE;
|
|
basis.c = total_flex_pref;
|
|
} else if (numNonSpecZeroISizeCols > 0) {
|
|
l2t = FLEX_FLEX_LARGE_ZERO;
|
|
basis.c = numNonSpecZeroISizeCols;
|
|
} 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(
|
|
"ComputeColumnISizes: %d columns in isize %d,\n"
|
|
" guesses=[%d,%d,%d,%d], totals=[%d,%d,%f],\n"
|
|
" l2t=%d, space=%d, basis.c=%d\n",
|
|
aColCount, aISize, 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_iSize;
|
|
|
|
float pct = colFrame->GetPrefPercent();
|
|
if (pct != 0.0f) {
|
|
col_iSize = nscoord(float(aISize) * pct);
|
|
nscoord col_min = colFrame->GetMinCoord();
|
|
if (col_iSize < col_min) {
|
|
col_iSize = col_min;
|
|
}
|
|
} else {
|
|
col_iSize = colFrame->GetPrefCoord();
|
|
}
|
|
|
|
nscoord col_iSize_before_adjust = col_iSize;
|
|
|
|
switch (l2t) {
|
|
case FLEX_PCT_SMALL:
|
|
col_iSize = col_iSize_before_adjust = colFrame->GetMinCoord();
|
|
if (pct != 0.0f) {
|
|
nscoord pct_minus_min = nscoord(float(aISize) * pct) - col_iSize;
|
|
if (pct_minus_min > 0) {
|
|
float c = float(space) / float(basis.c);
|
|
basis.c -= pct_minus_min;
|
|
col_iSize += NSToCoordRound(float(pct_minus_min) * c);
|
|
}
|
|
}
|
|
break;
|
|
case FLEX_FIXED_SMALL:
|
|
if (pct == 0.0f) {
|
|
NS_ASSERTION(col_iSize == colFrame->GetPrefCoord(),
|
|
"wrong inline-size assigned");
|
|
if (colFrame->GetHasSpecifiedCoord()) {
|
|
nscoord col_min = colFrame->GetMinCoord();
|
|
nscoord pref_minus_min = col_iSize - col_min;
|
|
col_iSize = col_iSize_before_adjust = col_min;
|
|
if (pref_minus_min != 0) {
|
|
float c = float(space) / float(basis.c);
|
|
basis.c -= pref_minus_min;
|
|
col_iSize += NSToCoordRound(float(pref_minus_min) * c);
|
|
}
|
|
} else
|
|
col_iSize = col_iSize_before_adjust = colFrame->GetMinCoord();
|
|
}
|
|
break;
|
|
case FLEX_FLEX_SMALL:
|
|
if (pct == 0.0f && !colFrame->GetHasSpecifiedCoord()) {
|
|
NS_ASSERTION(col_iSize == colFrame->GetPrefCoord(),
|
|
"wrong inline-size assigned");
|
|
nscoord col_min = colFrame->GetMinCoord();
|
|
nscoord pref_minus_min =
|
|
NSCoordSaturatingSubtract(col_iSize, col_min, 0);
|
|
col_iSize = col_iSize_before_adjust = col_min;
|
|
if (pref_minus_min != 0) {
|
|
float c = float(space) / float(basis.c);
|
|
// If we have infinite-isize cols, then the standard
|
|
// adjustment to col_iSize 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_iSize adjustment (making us assign all the
|
|
// space to the first inf-isize col). To correct for
|
|
// this, we'll also divide by numInfiniteISizeCols to
|
|
// spread the space equally among the inf-isize cols.
|
|
if (numInfiniteISizeCols) {
|
|
if (colFrame->GetPrefCoord() == nscoord_MAX) {
|
|
c = c / float(numInfiniteISizeCols);
|
|
--numInfiniteISizeCols;
|
|
} else {
|
|
c = 0.0f;
|
|
}
|
|
}
|
|
basis.c =
|
|
NSCoordSaturatingSubtract(basis.c, pref_minus_min, nscoord_MAX);
|
|
col_iSize += NSToCoordRound(float(pref_minus_min) * c);
|
|
}
|
|
}
|
|
break;
|
|
case FLEX_FLEX_LARGE:
|
|
if (pct == 0.0f && !colFrame->GetHasSpecifiedCoord()) {
|
|
NS_ASSERTION(col_iSize == colFrame->GetPrefCoord(),
|
|
"wrong inline-size assigned");
|
|
if (col_iSize != 0) {
|
|
if (space == nscoord_MAX) {
|
|
basis.c -= col_iSize;
|
|
col_iSize = nscoord_MAX;
|
|
} else {
|
|
float c = float(space) / float(basis.c);
|
|
basis.c -= col_iSize;
|
|
col_iSize += NSToCoordRound(float(col_iSize) * c);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case FLEX_FLEX_LARGE_ZERO:
|
|
if (pct == 0.0f && !colFrame->GetHasSpecifiedCoord() &&
|
|
cellMap->GetNumCellsOriginatingInCol(col) > 0) {
|
|
NS_ASSERTION(col_iSize == 0 && colFrame->GetPrefCoord() == 0,
|
|
"Since we're in FLEX_FLEX_LARGE_ZERO case, "
|
|
"all auto-inline-size cols should have zero "
|
|
"pref inline-size.");
|
|
float c = float(space) / float(basis.c);
|
|
col_iSize += NSToCoordRound(c);
|
|
--basis.c;
|
|
}
|
|
break;
|
|
case FLEX_FIXED_LARGE:
|
|
if (pct == 0.0f) {
|
|
NS_ASSERTION(col_iSize == colFrame->GetPrefCoord(),
|
|
"wrong inline-size assigned");
|
|
NS_ASSERTION(
|
|
colFrame->GetHasSpecifiedCoord() || colFrame->GetPrefCoord() == 0,
|
|
"wrong case");
|
|
if (col_iSize != 0) {
|
|
float c = float(space) / float(basis.c);
|
|
basis.c -= col_iSize;
|
|
col_iSize += NSToCoordRound(float(col_iSize) * 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_iSize += NSToCoordRound(pct * c);
|
|
basis.f -= pct;
|
|
}
|
|
break;
|
|
case FLEX_ALL_LARGE: {
|
|
float c = float(space) / float(basis.c);
|
|
col_iSize += NSToCoordRound(c);
|
|
--basis.c;
|
|
} break;
|
|
}
|
|
|
|
// Only subtract from space if it's a real number.
|
|
if (space != nscoord_MAX) {
|
|
NS_ASSERTION(col_iSize != nscoord_MAX,
|
|
"How is col_iSize nscoord_MAX if space isn't?");
|
|
NS_ASSERTION(
|
|
col_iSize_before_adjust != nscoord_MAX,
|
|
"How is col_iSize_before_adjust nscoord_MAX if space isn't?");
|
|
space -= col_iSize - col_iSize_before_adjust;
|
|
}
|
|
|
|
NS_ASSERTION(col_iSize >= colFrame->GetMinCoord(),
|
|
"assigned inline-size smaller than min");
|
|
|
|
// Apply the new isize
|
|
switch (aISizeType) {
|
|
case BTLS_MIN_ISIZE: {
|
|
// Note: AddSpanCoords requires both a min and pref isize.
|
|
// For the pref isize, we'll just pass in our computed
|
|
// min isize, because the real pref isize will be at least
|
|
// as big
|
|
colFrame->AddSpanCoords(col_iSize, col_iSize, aSpanHasSpecifiedISize);
|
|
} break;
|
|
case BTLS_PREF_ISIZE: {
|
|
// Note: AddSpanCoords requires both a min and pref isize.
|
|
// For the min isize, we'll just pass in 0, because
|
|
// the real min isize will be at least 0
|
|
colFrame->AddSpanCoords(0, col_iSize, aSpanHasSpecifiedISize);
|
|
} break;
|
|
case BTLS_FINAL_ISIZE: {
|
|
nscoord old_final = colFrame->GetFinalISize();
|
|
colFrame->SetFinalISize(col_iSize);
|
|
|
|
if (old_final != col_iSize) {
|
|
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");
|
|
}
|