public void Drop(IResource targetResource, IDataObject data, DragDropEffects allowedEffect, int keyState)
{
// If the base handler can handle the dragover, let it do the drop
if (_baseHandler.DragOver(targetResource, data, allowedEffect, keyState) != DragDropEffects.None)
{
_baseHandler.Drop(targetResource, data, allowedEffect, keyState);
return;
}
// Now give the link-handler a try
if (_linkhandler.DragOver(targetResource, data, allowedEffect, keyState) != DragDropEffects.None)
{
_linkhandler.Drop(targetResource, data, allowedEffect, keyState);
return;
}
}
/// <summary>
/// Handles the DnD <see cref="JetListView.DragDrop"/> event from the underlying <see cref="JetListView"/>, and fires the own <see cref="ResourceDrop"/> event for the external handlers (if none available, invokes the default handler).
/// </summary>
private void HandleDragDrop(object sender, JetListViewDragEventArgs args)
{
try
{
////////////
// Prepare
JetListViewNode nodeInsertionPoint = args.DropTargetNode; // In tree-insertion-mode, we drop to the parent, and here we store the original target to use as an insertion point
IResource targetRes;
if (!CheckDragDropMode(args, out targetRes))
{
return; // Operation cancelled
}
// The resources being dragged
IResourceList resDragged = args.Data.GetDataPresent(typeof(IResourceList)) ? (IResourceList)args.Data.GetData(typeof(IResourceList)) : Core.ResourceStore.EmptyResourceList;
lock (resDragged) // Kill the resource list to avoid the changes
resDragged = Core.ResourceStore.ListFromIds(resDragged.ResourceIds, false);
////////////
// Reorder
// If we were dragging in the insertion mode, change the order
// Do it beforehand to avoid “jumping” the item when it first gets added to the end and then jumps to the proper place
if (((args.DropTargetRenderMode & DropTargetRenderMode.InsertAny) != 0) && (nodeInsertionPoint != null))
{
if (nodeInsertionPoint.Parent != null)
{
// Collect IDs of the current set of resources under the node (they may be useful if there's no existing order yet)
// TODO: lock?
IntArrayList arOld = new IntArrayList(nodeInsertionPoint.Parent.Nodes.Count);
foreach (JetListViewNode node in nodeInsertionPoint.Parent.Nodes)
{
arOld.Add(((IResource)node.Data).OriginalId);
}
UserResourceOrder uro = new UserResourceOrder(
nodeInsertionPoint.Parent.Data != null ? (IResource)nodeInsertionPoint.Parent.Data : _resRoot
, JobPriority.Immediate);
uro.Insert(
((IResource)nodeInsertionPoint.Data).OriginalId
, resDragged.ResourceIds
, ((args.DropTargetRenderMode & DropTargetRenderMode.InsertBelow) != 0)
, arOld);
}
}
/////////
// Drop
// Invoke the external handler for the drop event
if ((ResourceDrop != null) && (resDragged.Count > 0)) // A custom handler is available
{
ResourceDrop(this, new ResourceDragEventArgs(targetRes, resDragged));
}
else
{ // No custom handler, invoke the default one
if ((targetRes == RootResource) && (_rootResourceDropHandler != null)) // Empty/Root special handler
{
_rootResourceDropHandler.Drop(targetRes, args.Data, args.AllowedEffect, args.KeyState);
}
else // Normal d'n'd handler
{
Core.UIManager.ProcessDragDrop(targetRes, args.Data, args.AllowedEffect, args.KeyState);
}
}
}
catch (Exception ex)
{
Core.ReportException(ex, ExceptionReportFlags.AttachLog);
}
}