void MultiColumnFragmentainerGroup::columnIntervalForVisualRect(
const LayoutRect& rect,
unsigned& firstColumn,
unsigned& lastColumn) const {
bool isColumnProgressionInline =
m_columnSet.multiColumnFlowThread()->progressionIsInline();
bool isFlippedColumnProgression =
!m_columnSet.style()->isLeftToRightDirection() &&
isColumnProgressionInline;
if (m_columnSet.isHorizontalWritingMode() == isColumnProgressionInline) {
if (isFlippedColumnProgression) {
firstColumn = columnIndexAtVisualPoint(rect.maxXMinYCorner());
lastColumn = columnIndexAtVisualPoint(rect.minXMinYCorner());
} else {
firstColumn = columnIndexAtVisualPoint(rect.minXMinYCorner());
lastColumn = columnIndexAtVisualPoint(rect.maxXMinYCorner());
}
} else {
if (isFlippedColumnProgression) {
firstColumn = columnIndexAtVisualPoint(rect.minXMaxYCorner());
lastColumn = columnIndexAtVisualPoint(rect.minXMinYCorner());
} else {
firstColumn = columnIndexAtVisualPoint(rect.minXMinYCorner());
lastColumn = columnIndexAtVisualPoint(rect.minXMaxYCorner());
}
}
ASSERT(firstColumn <= lastColumn);
}
LayoutPoint MultiColumnFragmentainerGroup::visualPointToFlowThreadPoint(const LayoutPoint& visualPoint) const
{
unsigned columnIndex = columnIndexAtVisualPoint(visualPoint);
LayoutRect columnRect = columnRectAt(columnIndex);
LayoutPoint localPoint(visualPoint);
localPoint.moveBy(-columnRect.location());
// Before converting to a flow thread position, if the block direction coordinate is outside the
// column, snap to the bounds of the column, and reset the inline direction coordinate to the
// start position in the column. The effect of this is that if the block position is before the
// column rectangle, we'll get to the beginning of this column, while if the block position is
// after the column rectangle, we'll get to the beginning of the next column.
if (!m_columnSet.isHorizontalWritingMode()) {
LayoutUnit columnStart = m_columnSet.style()->isLeftToRightDirection() ? LayoutUnit() : columnRect.height();
if (localPoint.x() < 0)
localPoint = LayoutPoint(LayoutUnit(), columnStart);
else if (localPoint.x() > logicalHeight())
localPoint = LayoutPoint(logicalHeight(), columnStart);
return LayoutPoint(localPoint.x() + logicalTopInFlowThreadAt(columnIndex), localPoint.y());
}
LayoutUnit columnStart = m_columnSet.style()->isLeftToRightDirection() ? LayoutUnit() : columnRect.width();
if (localPoint.y() < 0)
localPoint = LayoutPoint(columnStart, LayoutUnit());
else if (localPoint.y() > logicalHeight())
localPoint = LayoutPoint(columnStart, logicalHeight());
return LayoutPoint(localPoint.x(), localPoint.y() + logicalTopInFlowThreadAt(columnIndex));
}
