/// <summary>
/// This method should return a tupple with two nodes without fail (if
/// it is called through the root node). The
/// first node should be the node in which the topPoint falls, if it
/// falls within one of it's tags, after the last tag of its last child,
/// if it has no children. The second node should be the node in
/// which the bottom point falls, if it falls within one of its tags,
/// before the first tag of its first child, or if it has no children.
/// </summary>
/// <param name="topPoint">
/// The top point.
/// </param>
/// <param name="bottomPoint">
/// The bottom point.
/// </param>
/// <returns>
/// The first last nodes between points.
/// </returns>
public Tuple <XamlNode, XamlNode> GetFirstLastNodesBetweenPoints(int topPoint, int bottomPoint)
{
if (topPoint == bottomPoint)
{
XamlNode node = this.GetNodeWithOffset(topPoint);
return(new Tuple <XamlNode, XamlNode>(node, node));
}
PositionAndNode pan1 = this.GetTopPointPositionAndNode(topPoint);
PositionAndNode pan2 = this.GetBottomPointPositionAndNode(bottomPoint);
if (pan1.Node.Parent != pan2.Node.Parent)
{
XamlNode parent = pan1.Node.GetCommonAncestor(pan2.Node);
XamlNode node1 = parent.GetChildNodeWithOffset(topPoint);
XamlNode node2 = parent.GetChildNodeWithOffset(bottomPoint);
return(new Tuple <XamlNode, XamlNode>(node1, node2));
}
return(new Tuple <XamlNode, XamlNode>(pan1.Node, pan2.Node));
}
private PositionAndNode GetTopPointPositionAndNode(int topPoint)
{
var pan = new PositionAndNode(this, topPoint);
if (pan.Position != NodePosition.Content || !this.HasChildren)
{
return(pan);
}
LinkedListNode <XamlNode> childNode = this.ChildrenContainer.First;
do
{
PositionAndNode childPan = childNode.Value.GetTopPointPositionAndNode(topPoint);
if (childPan.Position != NodePosition.After)
{
return(childPan);
}
}while ((childNode = childNode.Next) != null);
return(pan);
}
private PositionAndNode GetBottomPointPositionAndNode(int bottomPoint)
{
var pan = new PositionAndNode(this, bottomPoint);
if (pan.Position != NodePosition.Content || !this.HasChildren)
{
return(pan);
}
LinkedListNode <XamlNode> childNode = this.ChildrenContainer.Last;
do
{
PositionAndNode childPan = childNode.Value.GetBottomPointPositionAndNode(bottomPoint);
if (childPan.Position != NodePosition.Before)
{
return(childPan);
}
}while ((childNode = childNode.Previous) != null);
return(pan);
}