/// <summary> Uses HitTesting to determine the block at the specified point. </summary>
/// <param name="point"> The point at which the hit test should be performed. </param>
/// <returns> The block at a the given point. </returns>
public Block GetBlockAt(DocumentPoint point)
{
_block = null;
if (point.Y < 0)
{
return(_ownerView.GetBlockFor(new DocumentPoint(0, 0)));
}
else if (point.Y > _ownerView.RootVisual.ActualHeight)
{
var lastBlock = _ownerView.Context.Document.Root.LastBlock;
return(BlockTreeWalker.GetNextNonContainerBlock(lastBlock)
?? lastBlock as ContentBlock);
}
var localPoint = _ownerView.ToPoint(point);
var instance = _ownerView.InputHitTest(localPoint);
if (instance is IDocumentItemView view &&
GetAssociatedBlock(view) is Block block)
{
_block = block;
}
public MeasuredRectangle(DocumentPoint documentPoint, double width, double height)
: this(documentPoint.X, documentPoint.Y, width, height)
{
}
/// <summary> Trims the point to be within the current rectangle. </summary>
/// <param name="point"> The point to trim. </param>
/// <returns>
/// A DocumentPoint with the X/Y values that now exist within the current rectangle.
/// </returns>
public DocumentPoint Trim(DocumentPoint point)
{
point.X = Math.Max(Left, Math.Min(Right, point.X));
point.Y = Math.Max(Top, Math.Min(Bottom, point.Y));
return(point);
}
public Block GetBlockFor(DocumentPoint point)
{
return(_blockSearchHitTester.GetBlockAt(point));
}
/// <summary> Convert a Document Point to a relative/WPF point. </summary>
public Point ToPoint(DocumentPoint point)
{
var localPoint = new Point(point.X, point.Y);
return(RootVisual.TranslatePoint(localPoint, _scrollView));
}
