private static void Move(object sender, Point point, eDrawingSource drawingSource)
{
var casted = (UIElement)sender;
if (!CanStartDrawingFrom(casted, drawingSource))
{
return;
}
GetPathInProgress(casted).AddPoint(point);
}
private static UIElement Start(object sender, Point start, eDrawingSource drawingSource)
{
var casted = (UIElement)sender;
if (!CanStartDrawingFrom(casted, drawingSource))
{
return(null);
}
SetCurrentDrawingSource(casted, drawingSource);
SetPathInProgress(casted, new PathBuilder(start, GetSegmentSize(casted), GetSmallMovementThreshold(casted)));
return(casted);
}
private static bool CanStartDrawingFrom(UIElement sender, eDrawingSource drawingSource)
{
eDrawingSource currentSource = GetCurrentDrawingSource(sender);
if (currentSource == eDrawingSource.None)
{
return(true);
}
// Favor, in order, stylus, touch, then mouse - blocking the others if they exist
switch (drawingSource)
{
case eDrawingSource.Mouse: return(currentSource == eDrawingSource.Mouse);
case eDrawingSource.Touch: return(currentSource == eDrawingSource.Mouse || currentSource == eDrawingSource.Touch);
case eDrawingSource.Stylus: return(true);
default:
return(false);
}
}
internal static void SetCurrentDrawingSource(DependencyObject obj, eDrawingSource value) => obj.SetValue(CurrentDrawingSourcePropertyKey, value);
