public void Remove(DraggableView view)
{
view.OnDragEvent -= this.OnDrag;
view.DragEndEvent -= this.DragEnded;
this.OriginalViewList.Remove(view);
this.SwitchedViewList.Remove(view);
this.Children.Remove(view);
}
public void Insert(int index, DraggableView view)
{
this.OriginalViewList.Insert(index, view);
this.SwitchedViewList.Insert(index, view);
this.Children.Insert(index, view);
view.DragStartEvent += this.DragStarted;
view.OnDragEvent += this.OnDrag;
view.DragEndEvent += this.DragEnded;
}
public void Move(DraggableView view, int toIndex)
{
this.OriginalViewList.Remove(view);
this.SwitchedViewList.Remove(view);
this.Children.Remove(view);
this.OriginalViewList.Insert(toIndex, view);
this.SwitchedViewList.Insert(toIndex, view);
this.Children.Insert(toIndex, view);
}
public void AddView(DraggableView view)
{
this.OriginalViewList.Add(view);
this.SwitchedViewList.Add(view);
this.Children.Add(view);
view.DragStartEvent += this.DragStarted;
view.OnDragEvent += this.OnDrag;
view.DragEndEvent += this.DragEnded;
}
private void OnDrag(object sender, OnDragEventArgs e)
{
DraggableView view = sender as DraggableView;
double yDelta = e.YDelta;
var indexOfViewNow = IndexOfViewInSwitchedList(view);
var indexOfViewbyRatio = IndexOfViewbyYDelta(view, yDelta);
if (indexOfViewNow == indexOfViewbyRatio)
{
return;
}
if (indexOfViewbyRatio < 0 || indexOfViewbyRatio >= SwitchedViewList.Count)
{
return;
}
var switchingView = SwitchedViewList[indexOfViewbyRatio];
var originalIndexOfSwitchinCell = OriginalIndexOfSwitchinCell(switchingView);
switchingView.TranslateTo(0, (indexOfViewNow - originalIndexOfSwitchinCell) * (switchingView.Height + Spacing));
SwitchedViewList[indexOfViewbyRatio] = view;
SwitchedViewList[indexOfViewNow] = switchingView;
}
private int OriginalIndexOfSwitchinCell(DraggableView switchingView)
{
return(OriginalViewList.FindIndex(v => v == switchingView));
}