public void GenerateVisualTree ()
{
if (!HasChildren)
return;
var children = new List<Element>();
InlineContainer inlines = null;
foreach (Element el in _children.SelectMany(c => c.GenerateVisualElements())) {
var inlineEl = el as InlineElement;
// Add inline child.
if (inlineEl != null) {
// Add inline child to inline element.
if (this is InlineElement) {
VisualChildren.Add(inlineEl);
}
// Add inline child to block element.
else {
// Group inline children into single inline container.
if (inlines == null) {
inlines = new InlineContainer((BlockElement)this);
children.Add(inlines);
}
inlines.Children.Add(inlineEl);
}
}
// Add block or generator child.
else {
if (inlines != null) {
// Close inline container.
inlines.VisualChildren = inlines.Children.ToList();
inlines = null;
}
children.Add(el);
}
// Recurse.
el.GenerateVisualTree();
}
// Close inline container (if not closed within foreach).
if (inlines != null) {
inlines.VisualChildren = inlines.Children.ToList();
}
// Let element decide how to add children: directly or grouped into stack.
SetVisualChildren(children);
}
protected virtual void SetVisualChildren ([NotNull] IList<Element> visualChildren)
{
if (visualChildren == null)
throw new ArgumentNullException(nameof(visualChildren));
if (visualChildren.Count == 1) {
VisualChildren = visualChildren;
}
else if (visualChildren.Count > 1) {
VisualChildren = new List<Element>(1) {
new Stack {
DataContext = DataContext,
VisualChildren = visualChildren,
}
};
}
}