void RenderNamedFlowFragment::updateLogicalHeight()
{
RenderRegion::updateLogicalHeight();
if (!hasAutoLogicalHeight())
return;
// We want to update the logical height based on the computed auto-height
// only after the measure cotnent layout phase when all the
// auto logical height regions have a computed auto-height.
if (m_flowThread->inMeasureContentLayoutPhase())
return;
// There may be regions with auto logical height that during the prerequisite layout phase
// did not have the chance to layout flow thread content. Because of that, these regions do not
// have a computedAutoHeight and they will not be able to fragment any flow
// thread content.
if (!hasComputedAutoHeight())
return;
LayoutUnit newLogicalHeight = computedAutoHeight() + borderAndPaddingLogicalHeight();
ASSERT(newLogicalHeight < RenderFlowThread::maxLogicalHeight());
if (newLogicalHeight > logicalHeight()) {
setLogicalHeight(newLogicalHeight);
// Recalculate position of the render block after new logical height is set.
// (needed in absolute positioning case with bottom alignment for example)
RenderRegion::updateLogicalHeight();
}
}
void RenderRegion::updateLogicalHeight()
{
RenderBlock::updateLogicalHeight();
if (!hasAutoLogicalHeight())
return;
// We want to update the logical height based on the computed override logical
// content height only if the view is in the layout phase
// in which all the auto logical height regions have their override logical height set.
if (!m_flowThread->inConstrainedLayoutPhase())
return;
// There may be regions with auto logical height that during the prerequisite layout phase
// did not have the chance to layout flow thread content. Because of that, these regions do not
// have an overrideLogicalContentHeight computed and they will not be able to fragment any flow
// thread content.
if (!hasOverrideHeight())
return;
LayoutUnit newLogicalHeight = overrideLogicalContentHeight() + borderAndPaddingLogicalHeight();
ASSERT(newLogicalHeight < LayoutUnit::max() / 2);
if (newLogicalHeight > logicalHeight())
setLogicalHeight(newLogicalHeight);
}
void RenderGrid::layoutGridItems()
{
Vector<GridTrack> columnTracks(maximumIndexInDirection(ForColumns));
Vector<GridTrack> rowTracks(maximumIndexInDirection(ForRows));
computedUsedBreadthOfGridTracks(ForColumns, columnTracks, rowTracks);
ASSERT(tracksAreWiderThanMinTrackBreadth(ForColumns, columnTracks));
computedUsedBreadthOfGridTracks(ForRows, columnTracks, rowTracks);
ASSERT(tracksAreWiderThanMinTrackBreadth(ForRows, rowTracks));
for (RenderBox* child = firstChildBox(); child; child = child->nextSiblingBox()) {
LayoutPoint childPosition = findChildLogicalPosition(child, columnTracks, rowTracks);
size_t columnTrack = resolveGridPosition(child->style()->gridItemColumn());
size_t rowTrack = resolveGridPosition(child->style()->gridItemRow());
// Because the grid area cannot be styled, we don't need to adjust
// the grid breadth to account for 'box-sizing'.
LayoutUnit oldOverrideContainingBlockContentLogicalWidth = child->hasOverrideContainingBlockLogicalWidth() ? child->overrideContainingBlockContentLogicalWidth() : LayoutUnit();
LayoutUnit oldOverrideContainingBlockContentLogicalHeight = child->hasOverrideContainingBlockLogicalHeight() ? child->overrideContainingBlockContentLogicalHeight() : LayoutUnit();
if (oldOverrideContainingBlockContentLogicalWidth != columnTracks[columnTrack].m_usedBreadth || oldOverrideContainingBlockContentLogicalHeight != rowTracks[rowTrack].m_usedBreadth)
child->setNeedsLayout(true, MarkOnlyThis);
child->setOverrideContainingBlockContentLogicalWidth(columnTracks[columnTrack].m_usedBreadth);
child->setOverrideContainingBlockContentLogicalHeight(rowTracks[rowTrack].m_usedBreadth);
// FIXME: Grid items should stretch to fill their cells. Once we
// implement grid-{column,row}-align, we can also shrink to fit. For
// now, just size as if we were a regular child.
child->layoutIfNeeded();
// FIXME: Handle border & padding on the grid element.
child->setLogicalLocation(childPosition);
}
for (size_t i = 0; i < rowTracks.size(); ++i)
setLogicalHeight(logicalHeight() + rowTracks[i].m_usedBreadth);
// FIXME: We should handle min / max logical height.
setLogicalHeight(logicalHeight() + borderAndPaddingLogicalHeight());
}
int RenderTextControl::textBlockLogicalHeight() const
{
return logicalHeight() - borderAndPaddingLogicalHeight();
}
int LayoutTextControl::textBlockLogicalHeight() const {
return (logicalHeight() - borderAndPaddingLogicalHeight()).toInt();
}
void LayoutReplaced::computePositionedLogicalHeight(
LogicalExtentComputedValues& computedValues) const {
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.6.5 "Absolutely positioned, replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-height>
// (block-style-comments in this function correspond to text from the spec and
// the numbers correspond to numbers in spec)
// We don't use containingBlock(), since we may be positioned by an enclosing
// relpositioned inline.
const LayoutBoxModelObject* containerBlock =
toLayoutBoxModelObject(container());
const LayoutUnit containerLogicalHeight =
containingBlockLogicalHeightForPositioned(containerBlock);
const LayoutUnit containerRelativeLogicalWidth =
containingBlockLogicalWidthForPositioned(containerBlock, false);
// Variables to solve.
Length marginBefore = style()->marginBefore();
Length marginAfter = style()->marginAfter();
LayoutUnit& marginBeforeAlias = computedValues.m_margins.m_before;
LayoutUnit& marginAfterAlias = computedValues.m_margins.m_after;
Length logicalTop = style()->logicalTop();
Length logicalBottom = style()->logicalBottom();
// ---------------------------------------------------------------------------
// 1. The used value of 'height' is determined as for inline replaced
// elements.
// ---------------------------------------------------------------------------
// NOTE: This value of height is final in that the min/max height calculations
// are dealt with in computeReplacedHeight(). This means that the steps to
// produce correct max/min in the non-replaced version, are not necessary.
computedValues.m_extent =
computeReplacedLogicalHeight() + borderAndPaddingLogicalHeight();
const LayoutUnit availableSpace =
containerLogicalHeight - computedValues.m_extent;
// ---------------------------------------------------------------------------
// 2. If both 'top' and 'bottom' have the value 'auto', replace 'top' with the
// element's static position.
// ---------------------------------------------------------------------------
// see FIXME 1
computeBlockStaticDistance(logicalTop, logicalBottom, this, containerBlock);
// ---------------------------------------------------------------------------
// 3. If 'bottom' is 'auto', replace any 'auto' on 'margin-top' or
// 'margin-bottom' with '0'.
// ---------------------------------------------------------------------------
// FIXME: The spec. says that this step should only be taken when bottom is
// auto, but if only top is auto, this makes step 4 impossible.
if (logicalTop.isAuto() || logicalBottom.isAuto()) {
if (marginBefore.isAuto())
marginBefore.setValue(Fixed, 0);
if (marginAfter.isAuto())
marginAfter.setValue(Fixed, 0);
}
// ---------------------------------------------------------------------------
// 4. If at this point both 'margin-top' and 'margin-bottom' are still 'auto',
// solve the equation under the extra constraint that the two margins must
// get equal values.
// ---------------------------------------------------------------------------
LayoutUnit logicalTopValue;
LayoutUnit logicalBottomValue;
if (marginBefore.isAuto() && marginAfter.isAuto()) {
// 'top' and 'bottom' cannot be 'auto' due to step 2 and 3 combined.
ASSERT(!(logicalTop.isAuto() || logicalBottom.isAuto()));
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
LayoutUnit difference =
availableSpace - (logicalTopValue + logicalBottomValue);
// NOTE: This may result in negative values.
marginBeforeAlias = difference / 2; // split the difference
marginAfterAlias =
difference - marginBeforeAlias; // account for odd valued differences
// -------------------------------------------------------------------------
// 5. If at this point there is only one 'auto' left, solve the equation
// for that value.
// -------------------------------------------------------------------------
} else if (logicalTop.isAuto()) {
marginBeforeAlias =
valueForLength(marginBefore, containerRelativeLogicalWidth);
marginAfterAlias =
valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
// Solve for 'top'
logicalTopValue = availableSpace - (logicalBottomValue + marginBeforeAlias +
marginAfterAlias);
} else if (logicalBottom.isAuto()) {
marginBeforeAlias =
valueForLength(marginBefore, containerRelativeLogicalWidth);
marginAfterAlias =
valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
// Solve for 'bottom'
// NOTE: It is not necessary to solve for 'bottom' because we don't ever
// use the value.
} else if (marginBefore.isAuto()) {
marginAfterAlias =
valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
// Solve for 'margin-top'
marginBeforeAlias = availableSpace - (logicalTopValue + logicalBottomValue +
marginAfterAlias);
} else if (marginAfter.isAuto()) {
marginBeforeAlias =
valueForLength(marginBefore, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
// Solve for 'margin-bottom'
marginAfterAlias = availableSpace - (logicalTopValue + logicalBottomValue +
marginBeforeAlias);
} else {
// Nothing is 'auto', just calculate the values.
marginBeforeAlias =
valueForLength(marginBefore, containerRelativeLogicalWidth);
marginAfterAlias =
valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
// NOTE: It is not necessary to solve for 'bottom' because we don't ever
// use the value.
}
// ---------------------------------------------------------------------------
// 6. If at this point the values are over-constrained, ignore the value for
// 'bottom' and solve for that value.
// ---------------------------------------------------------------------------
// NOTE: It is not necessary to do this step because we don't end up using the
// value of 'bottom' regardless of whether the values are over-constrained or
// not.
// Use computed values to calculate the vertical position.
LayoutUnit logicalTopPos = logicalTopValue + marginBeforeAlias;
computeLogicalTopPositionedOffset(logicalTopPos, this,
computedValues.m_extent, containerBlock,
containerLogicalHeight);
computedValues.m_position = logicalTopPos;
}