public Rect SelectStrokesByNode(IInkAnalysisNode node)
{
var ids = GetNodeStrokeIds(node);
var strokes = GetStrokesByIds(ids);
var rect = SelectStrokes(strokes);
return(rect);
}
private IReadOnlyList <uint> GetNodeStrokeIds(IInkAnalysisNode node)
{
var strokeIds = node.GetStrokeIds();
if (node.Kind == InkAnalysisNodeKind.Paragraph && node.Children[0].Kind == InkAnalysisNodeKind.ListItem)
{
strokeIds = new HashSet <uint>(strokeIds).ToList();
}
return(strokeIds);
}
private void ShowOrHideSelection(IInkAnalysisNode node)
{
if (node != null)
{
var rect = _strokeService.SelectStrokesByNode(node);
_selectionRectangleService.UpdateSelectionRect(rect);
}
else
{
ClearSelection();
}
}
private void InkCanvas_Tapped(object sender, TappedRoutedEventArgs e)
{
var position = e.GetPosition(_inkCanvas);
if (selectedNode != null && RectHelper.Contains(selectedNode.BoundingRect, position))
{
if (DateTime.Now.Subtract(lastDoubleTapTime).TotalMilliseconds < TripleTapTime)
{
ExpandSelection();
}
}
else
{
selectedNode = _analyzer.FindHitNode(position);
ShowOrHideSelection(selectedNode);
}
}
private async void InkCanvas_PointerPressed(object sender, PointerRoutedEventArgs e)
{
var position = e.GetCurrentPoint(_inkCanvas).Position;
while (_analyzer.IsAnalyzing)
{
await Task.Delay(TimeSpan.FromMilliseconds(BusyWaitingTime));
}
if (_selectionRectangleService.ContainsPosition(position))
{
// Pressed on the selected rect, do nothing
return;
}
selectedNode = _analyzer.FindHitNode(position);
ShowOrHideSelection(selectedNode);
}
private void ExpandSelection()
{
if (selectedNode != null &&
selectedNode.Kind != InkAnalysisNodeKind.UnclassifiedInk &&
selectedNode.Kind != InkAnalysisNodeKind.InkDrawing &&
selectedNode.Kind != InkAnalysisNodeKind.WritingRegion)
{
selectedNode = selectedNode.Parent;
if (selectedNode.Kind == InkAnalysisNodeKind.ListItem && selectedNode.Children.Count == 1)
{
// Hierarchy: WritingRegion->Paragraph->ListItem->Line->{Bullet, Word1, Word2...}
// When a ListItem has only one Line, the bounding rect is same with its child Line,
// in this case, we skip one level to avoid confusion.
selectedNode = selectedNode.Parent;
}
ShowOrHideSelection(selectedNode);
}
}
public void ClearSelection()
{
selectedNode = null;
_strokeService.ClearStrokesSelection();
_selectionRectangleService.Clear();
}
