private IEnumerator <object> DragSeparatorTask(int index)
{
RaiseDragStarted();
var initialMousePosition = Input.MousePosition;
var initialHeights = Nodes.Select(i => i.AsWidget.Height).ToList();
while (Input.IsMousePressed())
{
WidgetContext.Current.MouseCursor = MouseCursor.SizeNS;
var dragDelta = Input.MousePosition.Y - initialMousePosition.Y;
AdjustStretchDelta(initialHeights[index], Nodes[index].AsWidget, ref dragDelta);
dragDelta = -dragDelta;
AdjustStretchDelta(initialHeights[index + 1], Nodes[index + 1].AsWidget, ref dragDelta);
dragDelta = -dragDelta;
for (int i = 0; i < Nodes.Count; i++)
{
var d = (i == index) ? dragDelta : ((i == index + 1) ? -dragDelta : 0);
if (i == Stretches.Count)
{
Stretches.Add(0);
}
Stretches[i] = initialHeights[i] + d;
}
Layout.InvalidateConstraintsAndArrangement();
yield return(null);
}
RaiseDragEnded();
}
public void Add(TrackStretch stretch)
{
if (stretch == null)
{
throw new ArgumentNullException(nameof(stretch));
}
if (Stretches.Count > 0 && stretch.End.Station.Equals(Stretches.Last().Start.Station))
{
Stretches.Insert(0, stretch);
}
else
{
Stretches.Add(stretch);
}
}
