ColumnBalancer::ColumnBalancer(const LayoutMultiColumnSet& columnSet,
LayoutUnit logicalTopInFlowThread,
LayoutUnit logicalBottomInFlowThread)
: m_columnSet(columnSet),
m_logicalTopInFlowThread(logicalTopInFlowThread),
m_logicalBottomInFlowThread(logicalBottomInFlowThread) {
DCHECK_GE(columnSet.usedColumnCount(), 1U);
}
InitialColumnHeightFinder::InitialColumnHeightFinder(
const LayoutMultiColumnSet& columnSet,
LayoutUnit logicalTopInFlowThread,
LayoutUnit logicalBottomInFlowThread)
: ColumnBalancer(columnSet,
logicalTopInFlowThread,
logicalBottomInFlowThread) {
m_shortestStruts.resize(columnSet.usedColumnCount());
for (auto& strut : m_shortestStruts)
strut = LayoutUnit::max();
traverse();
// We have now found each explicit / forced break, and their location. Now we
// need to figure out how many additional implicit / soft breaks we need and
// guess where they will occur, in order
// to provide an initial column height.
distributeImplicitBreaks();
}