private bool MoveItem(MenuLayoutViewModel menuLayout, FolderViewModel newParent, int indexInNewParent, FileNodeViewModel itemToMove)
{
var movedItem = true;
menuLayout.StartItemsUpdate();
// operate on the model
var parent = newParent.Model as Folder;
var itemToMoveModel = itemToMove.Model;
if (indexInNewParent >= parent.Files.Count)
{
if (!itemToMoveModel.Parent.MoveChildToNewParent(itemToMoveModel, parent, false))
{
throw new System.InvalidOperationException(Resources.Strings.MenuLayoutDragDrop_FailedToMoveItemMessage);
}
}
else
{
if (!itemToMoveModel.Parent.MoveChildToNewParent(itemToMoveModel, parent, indexInNewParent, false))
{
throw new System.InvalidOperationException(Resources.Strings.MenuLayoutDragDrop_FailedToMoveItemMessage);
}
}
menuLayout.FinishItemsUpdate(true);
return(movedItem);
}
/// <summary>
/// Moves items from one location in the tree to another.
/// </summary>
/// <param name="menuLayout">The root of the data tree.</param>
/// <param name="newParent">The new parent item for the items being moved.</param>
/// <param name="indexInNewParent">THe location in the new parent at which to add the items.</param>
/// <param name="itemsToMove">The items to relocate.</param>
/// <returns><c>true</c> if any of the items were moved.</returns>
internal bool MoveItems(MenuLayoutViewModel menuLayout, FolderViewModel newParent, int indexInNewParent, IEnumerable <FileNodeViewModel> itemsToMove)
{
var movedItems = itemsToMove.Any();
if (movedItems)
{
menuLayout.StartItemsUpdate();
foreach (var itemToMove in itemsToMove)
{
// Post-increment insert location to preserve order of dropped items.
movedItems = MoveItem(menuLayout, newParent, indexInNewParent++, itemToMove);
if (!movedItems)
{
break;
}
}
menuLayout.FinishItemsUpdate(true);
INTV.Shared.ComponentModel.CommandManager.InvalidateRequerySuggested();
}
return(movedItems);
}
private bool DropItem(MenuLayoutViewModel menuLayout, IFile droppedItem)
{
var acceptedDroppedItem = droppedItem != null;
if (acceptedDroppedItem)
{
if (menuLayout != null)
{
menuLayout.StartItemsUpdate();
}
if (droppedItem.Parent != null)
{
var selfAsFileContainer = Model as IFileContainer;
if (selfAsFileContainer != null)
{
if (!selfAsFileContainer.AddChild(droppedItem))
{
// we're moving to the bottom, so remove and re-add
selfAsFileContainer.RemoveChild(droppedItem);
selfAsFileContainer.AddChild(droppedItem);
}
}
else
{
// if an item is dropped on a non-file, insert before the drop target item.
var insertLocation = Parent.IndexOf(Model);
Parent.Insert(insertLocation, droppedItem);
}
}
if (menuLayout != null)
{
menuLayout.FinishItemsUpdate();
}
CommandManager.InvalidateRequerySuggested();
}
return(acceptedDroppedItem);
}
