/// <summary>
/// Looks for a handler within the composed ones and the link-handler, if enabled, and picks the first one that
/// confirms it can handle the situation in response to the dragover event.
/// That handler is then returned.
/// Note that the drag-over operation is thus already executed for that handler.
/// </summary>
protected DragDropEffects GetDragOverHandler(IResource targetResource, IDataObject data, DragDropEffects allowedEffect, int keyState, out IResourceDragDropHandler handlerFit)
{
DragDropEffects effect;
// Try the composed handlers
foreach (IResourceDragDropHandler handler in _handlers)
{
handlerFit = handler;
if ((effect = handlerFit.DragOver(targetResource, data, allowedEffect, keyState)) != DragDropEffects.None)
{
return(effect);
}
}
// Try the link-handler
if (_bAddLink)
{
handlerFit = _linkhandler;
if ((effect = handlerFit.DragOver(targetResource, data, allowedEffect, keyState)) != DragDropEffects.None)
{
return(effect);
}
}
// None has fit
handlerFit = null;
return(DragDropEffects.None);
}
public DragDropEffects DragOver(IResource targetResource, IDataObject data,
DragDropEffects allowedEffect, int keyState)
{
// Get the wrapped handler's opinion on the operation
DragDropEffects baseEffects = _baseHandler.DragOver(targetResource, data, allowedEffect, keyState);
// If base can handle, let it; otherwise, query the link-adapter
return(baseEffects != DragDropEffects.None ? baseEffects : _linkhandler.DragOver(targetResource, data, allowedEffect, keyState));
}
/// <summary>
/// Handles the DnD <see cref="JetListView.DragOver"/> event from the underlying <see cref="JetListView"/>, and fires the own <see cref="ResourceDragOver"/> event for the external handlers (if none available, invokes the default handler).
/// </summary>
private void HandleDragOver(object sender, JetListViewDragEventArgs args)
{
try
{
IResource targetRes;
if (!CheckDragDropMode(args, out targetRes))
{
return; // Operation cancelled
}
// Call the outer handler for the drag-over operation
if ((ResourceDragOver != null) && (args.Data.GetDataPresent(typeof(IResourceList))))
{ // Call the custom handler
IResourceList dragResources = (IResourceList)args.Data.GetData(typeof(IResourceList));
ResourceDragEventArgs resourceDragEventArgs = new ResourceDragEventArgs(targetRes, dragResources);
ResourceDragOver(this, resourceDragEventArgs);
args.Effect = resourceDragEventArgs.Effect;
}
else
{ // No custom handler defined, invoke the default handler
if ((targetRes == RootResource) && (_rootResourceDropHandler != null)) // Empty/Root special handler
{
args.Effect = _rootResourceDropHandler.DragOver(targetRes, args.Data, args.AllowedEffect, args.KeyState);
}
else // Normal d'n'd handler
{
args.Effect = Core.UIManager.ProcessDragOver(targetRes, args.Data, args.AllowedEffect, args.KeyState, (args.Data.GetData(typeof(ResourceListView2)) == this));
}
}
}
catch (Exception ex)
{
Core.ReportException(ex, ExceptionReportFlags.AttachLog);
}
}
public DragDropEffects DragOver(IResource targetResource, IDataObject data, DragDropEffects allowedEffect, int keyState)
{
if (targetResource.HasProp(PROP.Imported))
{
IResourceList dragResources = data.GetData(typeof(IResourceList)) as IResourceList;
if (dragResources.AllResourcesOfType("Contact"))
{
foreach (IResource resource in dragResources.ValidResources)
{
if (resource.HasProp(PROP.EntryID))
{
return(DragDropEffects.Copy);
}
}
}
}
return(parentHandler.DragOver(targetResource, data, allowedEffect, keyState));
}