private void HandleDrag(object sender, Dock thumbposition, double delta)
{
BeatContainerAdorner adorner = (BeatContainerAdorner)sender;
UIElement container = adorner.AdornedElement;
TimeSpan changedSpan = ViewPort.Multiply(delta / ActualWidth);
switch (thumbposition)
{
case Dock.Left:
{
TimeSpan duration = GetDuration(container) - changedSpan;
TimeSpan position = GetPosition(container) + changedSpan;
SetDuration(container, duration);
SetPosition(container, position);
break;
}
case Dock.Right:
{
TimeSpan duration = GetDuration(container) + changedSpan;
SetDuration(container, duration);
break;
}
case Dock.Top:
{
TimeSpan position = GetPosition(container) + changedSpan;
SetPosition(container, position);
break;
}
}
}
private void EnsureAdorners()
{
List <BeatContainer> containers = new List <BeatContainer>();
foreach (UIElement element in InternalChildren)
{
if (element is BeatContainer)
{
containers.Add((BeatContainer)element);
}
}
var removed = _adorners.Where(kvp => !containers.Contains(kvp.Key)).ToList();
var added = containers.Where(c => !_adorners.ContainsKey(c)).ToList();
if (added.Count > 0 || removed.Count > 0)
{
AdornerLayer layer = AdornerLayer.GetAdornerLayer(this);
foreach (KeyValuePair <UIElement, BeatContainerAdorner> container in removed)
{
BeatContainerAdorner adorner = container.Value;
adorner.DragEnded -= AdornerOnDragEnded;
adorner.DragStarted -= AdornerOnDragStarted;
adorner.DragDelta -= AdornerOnDragDelta;
_adorners.Remove(container.Key);
layer.Remove(adorner);
}
foreach (BeatContainer container in added)
{
BeatContainerAdorner adorner = new BeatContainerAdorner(container);
adorner.DragEnded += AdornerOnDragEnded;
adorner.DragStarted += AdornerOnDragStarted;
adorner.DragDelta += AdornerOnDragDelta;
_adorners.Add(container, adorner);
layer.Add(adorner);
}
}
}