buildColumnPlaceholder method
Builds column placeholder.
Implementation
WidgetPlaceholder? buildColumnPlaceholder(
BuildTree tree,
Iterable<WidgetPlaceholder> children,
) {
if (children.isEmpty) {
return null;
}
if (children.length == 1) {
return children.first;
}
return ColumnPlaceholder(
children: children,
tree: tree,
wf: this,
);
}