protected virtual void OnModelDropped(ModelDropEventArgs args)
{
if (this.ModelDropped != null)
{
this.ModelDropped(this, args);
}
}
protected virtual void OnModelCanDrop(ModelDropEventArgs args)
{
if (this.ModelCanDrop != null)
{
this.ModelCanDrop(this, args);
}
}
/// <summary>
/// Do the work of processing the dropped items
/// </summary>
/// <param name="args"></param>
public virtual void RearrangeModels(ModelDropEventArgs args)
{
switch (args.DropTargetLocation)
{
case DropTargetLocation.AboveItem:
this.ListView.MoveObjects(args.DropTargetIndex, args.SourceModels);
break;
case DropTargetLocation.BelowItem:
this.ListView.MoveObjects(args.DropTargetIndex + 1, args.SourceModels);
break;
case DropTargetLocation.Background:
this.ListView.AddObjects(args.SourceModels);
break;
default:
return;
}
if (args.SourceListView != this.ListView)
{
args.SourceListView.RemoveObjects(args.SourceModels);
}
}
protected override void OnModelCanDrop(ModelDropEventArgs args)
{
base.OnModelCanDrop(args);
if (args.Handled)
{
return;
}
args.Effect = DragDropEffects.Move;
// Don't allow drops from other list, if that's what's configured
if (!this.AcceptExternal && args.SourceListView != this.ListView)
{
args.Effect = DragDropEffects.None;
args.DropTargetLocation = DropTargetLocation.None;
args.InfoMessage = "This list doesn't accept drops from other lists";
}
// If we are rearranging a list, don't allow drops on the background
if (args.DropTargetLocation == DropTargetLocation.Background && args.SourceListView == this.ListView)
{
args.Effect = DragDropEffects.None;
args.DropTargetLocation = DropTargetLocation.None;
}
}
protected override void OnModelDropped(ModelDropEventArgs args)
{
base.OnModelDropped(args);
if (!args.Handled)
{
this.RearrangeModels(args);
}
}
