public DragDropEffects DragOver(IResource targetResource, IDataObject data, DragDropEffects allowedEffect, int keyState)
{
if (data.GetDataPresent(typeof(IResourceList))) // Dragging resources over
{
// The resources we're dragging
IResourceList dragResources = (IResourceList)data.GetData(typeof(IResourceList));
if (ListOfMailsOrLinkedAttachments(dragResources))
{
return(DragDropEffects.Move);
}
if (!dragResources.AllResourcesOfType(STR.MAPIFolder))
{
return(DragDropEffects.None);
}
foreach (IResource folder in dragResources.ValidResources)
{
// A default folder cannot be moved, so it can be dropped
// only to its own parent for the sake of reordering
if ((Folder.IsDefault(folder)) && (Folder.GetParent(folder) != targetResource))
{
return(DragDropEffects.None);
}
// Don't allow dropping to self and own children
if ((folder == targetResource) || (Folder.IsAncestor(targetResource, folder)))
{
return(DragDropEffects.None);
}
}
return(DragDropEffects.Move);
}
return(DragDropEffects.None);
}
protected override void ExecuteActionImpl(IResourceList selectedResources)
{
foreach (IResource folder in selectedResources.ValidResources)
{
if (folder.Id == _lastFolder.Id || Folder.IsDefault(folder) || Folder.IsAncestor(_lastFolder, folder))
{
StandartJobs.MessageBox("Cannot move folder '" + folder.DisplayName +
"' to folder '" + _lastFolder.DisplayName + "'", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
}
new MoveFolderToFolderAction().DoMove(_lastFolder, selectedResources);
}