/// <summary>
/// Applies layout changes to a given box and its children.
/// </summary>
public override void ApplyVerticalLayout([NotNull] LayoutState state, [NotNull] LayoutState.LayoutLevel level)
{
var node = level.BranchRoot;
if (node.Level == 0)
{
node.State.SiblingsRowV = new Dimensions(
node.State.Top,
node.State.Bottom);
}
if (node.State.NumberOfSiblings == 0)
{
return;
}
var siblingsRowExterior = Dimensions.MinMax();
if (Orientation == StackOrientation.SingleRowHorizontal)
{
var top = node.AssistantsRoot == null
? node.State.SiblingsRowV.To + ParentChildSpacing
: node.State.BranchExterior.Bottom + ParentChildSpacing;
for (var i = 0; i < node.State.NumberOfSiblings; i++)
{
var child = node.Children[i];
var rect = child.State;
child.State.MoveTo(0, top);
child.State.BranchExterior = new Rect(child.State.TopLeft, child.State.Size);
siblingsRowExterior += new Dimensions(top, top + rect.Size.Height);
}
siblingsRowExterior = new Dimensions(siblingsRowExterior.From, siblingsRowExterior.To);
for (var i = 0; i < node.State.NumberOfSiblings; i++)
{
var child = node.Children[i];
child.State.SiblingsRowV = siblingsRowExterior;
// re-enter layout algorithm for child branch
LayoutAlgorithm.VerticalLayout(state, child);
}
}
else if (Orientation == StackOrientation.SingleColumnVertical)
{
var prevRowExterior = new Dimensions(
node.State.SiblingsRowV.From,
node.State.SiblingsRowV.To);
for (var row = 0; row < node.State.NumberOfSiblings; row++)
{
// first, compute
var child = node.Children[row];
var rect = child.State;
var top = prevRowExterior.To + (row == 0 ? ParentChildSpacing : SiblingSpacing);
child.State.MoveTo(rect.Left, top);
child.State.BranchExterior = new Rect(child.State.TopLeft, child.State.Size);
var rowExterior = new Dimensions(top, top + rect.Size.Height);
child = node.Children[row];
child.State.SiblingsRowV = rowExterior;
// re-enter layout algorithm for child branch
LayoutAlgorithm.VerticalLayout(state, child);
var childBranchBottom = child.State.BranchExterior.Bottom;
prevRowExterior = new Dimensions(rowExterior.From, Math.Max(childBranchBottom, rowExterior.To));
}
}
}
