public void SetBaseAndExtent(Node anchorNode, int anchorOffset, Node focusNode, int focusOffset)
{
if (anchorOffset > anchorNode.nodeLength)
{
throw new IndexSizeError($"{nameof(anchorOffset)} exceeds {nameof(anchorNode.nodeLength)}");
}
if (focusOffset > focusNode.nodeLength)
{
throw new IndexSizeError($"{nameof(focusOffset)} exceeds {nameof(focusNode.nodeLength)}");
}
if (!ReferenceEquals(document, anchorNode.getRootNode()) || !ReferenceEquals(document, focusNode.getRootNode()))
{
return;
}
var anchor = new BoundaryPoint(anchorNode, anchorOffset);
var focus = new BoundaryPoint(focusNode, focusOffset);
var newRange = new Range(document);
if (Range.Get_Boundary_Position(anchor, focus) == EBoundaryPosition.Before)
{
newRange.setStart(anchor.node, anchor.offset);
newRange.setEnd(focus.node, focus.offset);
}
else
{
newRange.setStart(focus.node, focus.offset);
newRange.setEnd(anchor.node, anchor.offset);
}
_range = newRange;
direction = (Range.Get_Boundary_Position(focus, anchor) == EBoundaryPosition.Before) ? ESelectionDirection.Backward : ESelectionDirection.Forward;
}
public bool ContainsNode(Node node, bool allowPartialContainment = false)
{
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
if (_range == null || !ReferenceEquals(document, node.getRootNode()))
{
return(false);
}
var first = new BoundaryPoint(node, 0);
var last = new BoundaryPoint(node, node.nodeLength);
var firstPos = Range.Get_Boundary_Position(_range.start, first);
var lastPos = Range.Get_Boundary_Position(_range.end, last);
if (!allowPartialContainment)
{
return((firstPos == EBoundaryPosition.Before || firstPos == EBoundaryPosition.Equal) && (lastPos == EBoundaryPosition.After || lastPos == EBoundaryPosition.Equal));
}
else
{
return((firstPos == EBoundaryPosition.Before || firstPos == EBoundaryPosition.Equal) || (lastPos == EBoundaryPosition.After || lastPos == EBoundaryPosition.Equal));
}
}
public void Extend(Node node, int offset = 0)
{
if (_range == null)
{
throw new InvalidStateError($"Selection has no set range");
}
if (!ReferenceEquals(document, node.getRootNode()))
{
return;
}
var oldAnchor = Anchor.Value;
var oldFocus = Focus.Value;
var newFocus = new BoundaryPoint(node, offset);
var newRange = new Range(document);
if (!ReferenceEquals(_range.root, node.getRootNode()))
{
newRange.setStart(node, offset);
newRange.setEnd(node, offset);
}
else if (Range.Get_Boundary_Position(oldAnchor, newFocus) != EBoundaryPosition.After)
{
newRange.setStart(oldAnchor.node, oldAnchor.offset);
newRange.setEnd(newFocus.node, newFocus.offset);
}
else
{
newRange.setStart(newFocus.node, newFocus.offset);
newRange.setEnd(oldAnchor.node, oldAnchor.offset);
}
_range = newRange;
direction = Range.Get_Boundary_Position(newFocus, oldAnchor) == EBoundaryPosition.Before ? ESelectionDirection.Backward : ESelectionDirection.Forward;
}