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435 lines
18 KiB
C++
435 lines
18 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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/* 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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* Algorithms that determine column and table inline sizes used for
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* CSS2's 'table-layout: fixed'.
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*/
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#include "FixedTableLayoutStrategy.h"
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#include "nsTableFrame.h"
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#include "nsTableColFrame.h"
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#include "nsTableCellFrame.h"
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#include <algorithm>
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FixedTableLayoutStrategy::FixedTableLayoutStrategy(nsTableFrame *aTableFrame)
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: nsITableLayoutStrategy(nsITableLayoutStrategy::Fixed)
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, mTableFrame(aTableFrame)
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{
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MarkIntrinsicISizesDirty();
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}
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/* virtual */
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FixedTableLayoutStrategy::~FixedTableLayoutStrategy()
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{
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}
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/* virtual */ nscoord
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FixedTableLayoutStrategy::GetMinISize(nsRenderingContext* aRenderingContext)
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{
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DISPLAY_MIN_WIDTH(mTableFrame, mMinISize);
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if (mMinISize != NS_INTRINSIC_WIDTH_UNKNOWN) {
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return mMinISize;
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}
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// It's theoretically possible to do something much better here that
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// depends only on the columns and the first row (where we look at
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// intrinsic inline sizes inside the first row and then reverse the
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// algorithm to find the narrowest inline size that would hold all
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// of those intrinsic inline sizes), but it wouldn't be compatible
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// with other browsers, or with the use of GetMinISize by
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// nsTableFrame::ComputeSize to determine the inline size of a fixed
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// layout table, since CSS2.1 says:
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// The width of the table is then the greater of the value of the
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// 'width' property for the table element and the sum of the
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// column widths (plus cell spacing or borders).
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// XXX Should we really ignore 'min-width' and 'max-width'?
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// XXX Should we really ignore widths on column groups?
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nsTableCellMap *cellMap = mTableFrame->GetCellMap();
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int32_t colCount = cellMap->GetColCount();
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nscoord result = 0;
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if (colCount > 0) {
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result += mTableFrame->GetColSpacing(-1, colCount);
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}
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WritingMode wm = mTableFrame->GetWritingMode();
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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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nscoord spacing = mTableFrame->GetColSpacing(col);
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const nsStyleCoord *styleISize = &colFrame->StylePosition()->ISize(wm);
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if (styleISize->ConvertsToLength()) {
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result += nsLayoutUtils::ComputeISizeValue(aRenderingContext,
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colFrame, 0, 0, 0, *styleISize);
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} else if (styleISize->GetUnit() == eStyleUnit_Percent) {
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// do nothing
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} else {
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NS_ASSERTION(styleISize->GetUnit() == eStyleUnit_Auto ||
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styleISize->GetUnit() == eStyleUnit_Enumerated ||
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(styleISize->IsCalcUnit() && styleISize->CalcHasPercent()),
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"bad inline size");
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// The 'table-layout: fixed' algorithm considers only cells
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// in the first row.
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bool originates;
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int32_t colSpan;
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nsTableCellFrame *cellFrame =
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cellMap->GetCellInfoAt(0, col, &originates, &colSpan);
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if (cellFrame) {
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styleISize = &cellFrame->StylePosition()->ISize(wm);
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if (styleISize->ConvertsToLength() ||
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(styleISize->GetUnit() == eStyleUnit_Enumerated &&
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(styleISize->GetIntValue() == NS_STYLE_WIDTH_MAX_CONTENT ||
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styleISize->GetIntValue() ==
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NS_STYLE_WIDTH_MIN_CONTENT))) {
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nscoord cellISize = nsLayoutUtils::IntrinsicForContainer(
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aRenderingContext, cellFrame, nsLayoutUtils::MIN_ISIZE);
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if (colSpan > 1) {
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// If a column-spanning cell is in the first
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// row, split up the space evenly. (XXX This
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// isn't quite right if some of the columns it's
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// in have specified inline sizes. Should we
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// care?)
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cellISize = ((cellISize + spacing) / colSpan) - spacing;
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}
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result += cellISize;
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} else if (styleISize->GetUnit() == eStyleUnit_Percent) {
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if (colSpan > 1) {
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// XXX Can this force columns to negative
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// inline sizes?
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result -= spacing * (colSpan - 1);
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}
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}
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// else, for 'auto', '-moz-available', '-moz-fit-content',
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// and 'calc()' with percentages, do nothing
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}
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}
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}
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return (mMinISize = result);
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}
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/* virtual */ nscoord
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FixedTableLayoutStrategy::GetPrefISize(nsRenderingContext* aRenderingContext,
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bool aComputingSize)
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{
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// It's theoretically possible to do something much better here that
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// depends only on the columns and the first row (where we look at
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// intrinsic inline sizes inside the first row and then reverse the
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// algorithm to find the narrowest inline size that would hold all
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// of those intrinsic inline sizes), but it wouldn't be compatible
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// with other browsers.
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nscoord result = nscoord_MAX;
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DISPLAY_PREF_WIDTH(mTableFrame, result);
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return result;
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}
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/* virtual */ void
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FixedTableLayoutStrategy::MarkIntrinsicISizesDirty()
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{
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mMinISize = NS_INTRINSIC_WIDTH_UNKNOWN;
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mLastCalcISize = nscoord_MIN;
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}
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static inline nscoord
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AllocateUnassigned(nscoord aUnassignedSpace, float aShare)
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{
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if (aShare == 1.0f) {
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// This happens when the numbers we're dividing to get aShare
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// are equal. We want to return unassignedSpace exactly, even
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// if it can't be precisely round-tripped through float.
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return aUnassignedSpace;
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}
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return NSToCoordRound(float(aUnassignedSpace) * aShare);
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}
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/* virtual */ void
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FixedTableLayoutStrategy::ComputeColumnISizes(const nsHTMLReflowState& aReflowState)
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{
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nscoord tableISize = aReflowState.ComputedISize();
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if (mLastCalcISize == tableISize) {
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return;
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}
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mLastCalcISize = tableISize;
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nsTableCellMap *cellMap = mTableFrame->GetCellMap();
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int32_t colCount = cellMap->GetColCount();
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if (colCount == 0) {
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// No Columns - nothing to compute
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return;
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}
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// border-spacing isn't part of the basis for percentages.
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tableISize -= mTableFrame->GetColSpacing(-1, colCount);
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// store the old column inline sizes. We might call SetFinalISize
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// multiple times on the columns, due to this we can't compare at
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// the last call that the inline size has changed with respect to
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// the last call to ComputeColumnISizes. In order to overcome this
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// we store the old values in this array. A single call to
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// SetFinalISize would make it possible to call GetFinalISize before
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// and to compare when setting the final inline size.
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nsTArray<nscoord> oldColISizes;
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// XXX This ignores the 'min-width' and 'max-width' properties
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// throughout. Then again, that's what the CSS spec says to do.
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// XXX Should we really ignore widths on column groups?
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uint32_t unassignedCount = 0;
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nscoord unassignedSpace = tableISize;
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const nscoord unassignedMarker = nscoord_MIN;
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// We use the PrefPercent on the columns to store the percentages
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// used to compute column inline sizes in case we need to shrink
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// or expand the columns.
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float pctTotal = 0.0f;
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// Accumulate the total specified (non-percent) on the columns for
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// distributing excess inline size to the columns.
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nscoord specTotal = 0;
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WritingMode wm = mTableFrame->GetWritingMode();
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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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oldColISizes.AppendElement(0);
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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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oldColISizes.AppendElement(colFrame->GetFinalISize());
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colFrame->ResetPrefPercent();
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const nsStyleCoord *styleISize = &colFrame->StylePosition()->ISize(wm);
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nscoord colISize;
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if (styleISize->ConvertsToLength()) {
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colISize = nsLayoutUtils::ComputeISizeValue(
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aReflowState.rendContext,
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colFrame, 0, 0, 0, *styleISize);
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specTotal += colISize;
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} else if (styleISize->GetUnit() == eStyleUnit_Percent) {
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float pct = styleISize->GetPercentValue();
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colISize = NSToCoordFloor(pct * float(tableISize));
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colFrame->AddPrefPercent(pct);
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pctTotal += pct;
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} else {
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NS_ASSERTION(styleISize->GetUnit() == eStyleUnit_Auto ||
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styleISize->GetUnit() == eStyleUnit_Enumerated ||
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(styleISize->IsCalcUnit() &&
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styleISize->CalcHasPercent()),
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"bad inline size");
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// The 'table-layout: fixed' algorithm considers only cells
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// in the first row.
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bool originates;
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int32_t colSpan;
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nsTableCellFrame *cellFrame =
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cellMap->GetCellInfoAt(0, col, &originates, &colSpan);
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if (cellFrame) {
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styleISize = &cellFrame->StylePosition()->ISize(wm);
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if (styleISize->ConvertsToLength() ||
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(styleISize->GetUnit() == eStyleUnit_Enumerated &&
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(styleISize->GetIntValue() == NS_STYLE_WIDTH_MAX_CONTENT ||
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styleISize->GetIntValue() ==
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NS_STYLE_WIDTH_MIN_CONTENT))) {
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// XXX This should use real percentage padding
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// Note that the difference between MIN_ISIZE and
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// PREF_ISIZE shouldn't matter for any of these
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// values of styleISize; use MIN_ISIZE for symmetry
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// with GetMinISize above, just in case there is a
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// difference.
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colISize = nsLayoutUtils::IntrinsicForContainer(
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aReflowState.rendContext,
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cellFrame, nsLayoutUtils::MIN_ISIZE);
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} else if (styleISize->GetUnit() == eStyleUnit_Percent) {
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// XXX This should use real percentage padding
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nsIFrame::IntrinsicISizeOffsetData offsets =
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cellFrame->IntrinsicISizeOffsets();
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float pct = styleISize->GetPercentValue();
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colISize = NSToCoordFloor(pct * float(tableISize));
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nscoord boxSizingAdjust = 0;
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switch (cellFrame->StylePosition()->mBoxSizing) {
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case NS_STYLE_BOX_SIZING_CONTENT:
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boxSizingAdjust += offsets.hPadding;
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// Fall through
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case NS_STYLE_BOX_SIZING_PADDING:
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boxSizingAdjust += offsets.hBorder;
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// Fall through
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case NS_STYLE_BOX_SIZING_BORDER:
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// Don't add anything
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break;
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}
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colISize += boxSizingAdjust;
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pct /= float(colSpan);
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colFrame->AddPrefPercent(pct);
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pctTotal += pct;
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} else {
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// 'auto', '-moz-available', '-moz-fit-content', and
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// 'calc()' with percentages
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colISize = unassignedMarker;
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}
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if (colISize != unassignedMarker) {
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if (colSpan > 1) {
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// If a column-spanning cell is in the first
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// row, split up the space evenly. (XXX This
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// isn't quite right if some of the columns it's
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// in have specified iSizes. Should we care?)
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nscoord spacing = mTableFrame->GetColSpacing(col);
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colISize = ((colISize + spacing) / colSpan) - spacing;
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if (colISize < 0)
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colISize = 0;
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}
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if (styleISize->GetUnit() != eStyleUnit_Percent) {
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specTotal += colISize;
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}
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}
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} else {
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colISize = unassignedMarker;
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}
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}
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colFrame->SetFinalISize(colISize);
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if (colISize == unassignedMarker) {
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++unassignedCount;
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} else {
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unassignedSpace -= colISize;
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}
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}
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if (unassignedSpace < 0) {
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if (pctTotal > 0) {
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// If the columns took up too much space, reduce those that
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// had percentage inline sizes. The spec doesn't say to do
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// this, but we've always done it in the past, and so does
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// WinIE6.
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nscoord pctUsed = NSToCoordFloor(pctTotal * float(tableISize));
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nscoord reduce = std::min(pctUsed, -unassignedSpace);
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float reduceRatio = float(reduce) / pctTotal;
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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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nscoord colISize = colFrame->GetFinalISize();
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colISize -= NSToCoordFloor(colFrame->GetPrefPercent() *
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reduceRatio);
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if (colISize < 0)
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colISize = 0;
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colFrame->SetFinalISize(colISize);
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}
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}
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unassignedSpace = 0;
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}
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if (unassignedCount > 0) {
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// The spec says to distribute the remaining space evenly among
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// the columns.
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nscoord toAssign = unassignedSpace / unassignedCount;
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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 (colFrame->GetFinalISize() == unassignedMarker)
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colFrame->SetFinalISize(toAssign);
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}
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} else if (unassignedSpace > 0) {
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// The spec doesn't say how to distribute the unassigned space.
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if (specTotal > 0) {
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// Distribute proportionally to non-percentage columns.
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nscoord specUndist = specTotal;
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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 (colFrame->GetPrefPercent() == 0.0f) {
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NS_ASSERTION(colFrame->GetFinalISize() <= specUndist,
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"inline sizes don't add up");
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nscoord toAdd = AllocateUnassigned(unassignedSpace,
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float(colFrame->GetFinalISize()) / float(specUndist));
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specUndist -= colFrame->GetFinalISize();
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colFrame->SetFinalISize(colFrame->GetFinalISize() + toAdd);
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unassignedSpace -= toAdd;
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if (specUndist <= 0) {
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NS_ASSERTION(specUndist == 0,
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"math should be exact");
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break;
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}
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}
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}
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NS_ASSERTION(unassignedSpace == 0, "failed to redistribute");
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} else if (pctTotal > 0) {
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// Distribute proportionally to percentage columns.
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float pctUndist = pctTotal;
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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 (pctUndist < colFrame->GetPrefPercent()) {
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// This can happen with floating-point math.
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NS_ASSERTION(colFrame->GetPrefPercent() - pctUndist
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< 0.0001,
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"inline sizes don't add up");
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pctUndist = colFrame->GetPrefPercent();
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}
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nscoord toAdd = AllocateUnassigned(unassignedSpace,
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colFrame->GetPrefPercent() / pctUndist);
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colFrame->SetFinalISize(colFrame->GetFinalISize() + toAdd);
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unassignedSpace -= toAdd;
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pctUndist -= colFrame->GetPrefPercent();
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if (pctUndist <= 0.0f) {
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break;
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}
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}
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NS_ASSERTION(unassignedSpace == 0, "failed to redistribute");
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} else {
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// Distribute equally to the zero-iSize columns.
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int32_t colsRemaining = 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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NS_ASSERTION(colFrame->GetFinalISize() == 0, "yikes");
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nscoord toAdd = AllocateUnassigned(unassignedSpace,
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1.0f / float(colsRemaining));
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colFrame->SetFinalISize(toAdd);
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unassignedSpace -= toAdd;
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--colsRemaining;
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}
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NS_ASSERTION(unassignedSpace == 0, "failed to redistribute");
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}
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}
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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 (oldColISizes.ElementAt(col) != colFrame->GetFinalISize()) {
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mTableFrame->DidResizeColumns();
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break;
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}
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}
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}
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