org.netbeans.spi.viewmodel
Interface ReorderableTreeModel

All Superinterfaces:

Model, TreeModel

All Known Implementing Classes:

Models.CompoundModel

public interface ReorderableTreeModel
extends TreeModel

Data model for tree that supports reordering of child nodes. The created Node will contain an implementation of Index in it's lookup if canReorder(java.lang.Object) returns true.

When used together with DnDNodeModel, children can be reordered by Drag and Drop.

Since:

1.25

Field Summary

Fields inherited from interface org.netbeans.spi.viewmodel.TreeModel

ROOT

Method Summary

boolean	canReorder(Object parent) Provide if this model implementation can reorder children nodes.
void	reorder(Object parent, int[] perm) Reorder children nodes with a given permutation.

Methods inherited from interface org.netbeans.spi.viewmodel.TreeModel

addModelListener, getChildren, getChildrenCount, getRoot, isLeaf, removeModelListener

Method Detail

canReorder

boolean canReorder(Object parent)
                   throws UnknownTypeException

Provide if this model implementation can reorder children nodes.

Parameters:

parent - The parent node of children that are test for reorder

Returns:

true if this model can handle reordering of children, false otherwise

Throws:

UnknownTypeException - if this model implementation is not able to decide the reorder capability for given node type

reorder

void reorder(Object parent,
             int[] perm)
             throws UnknownTypeException

Reorder children nodes with a given permutation.

Parameters:

parent - The parent node of children that are being reordered

perm - permutation with the length of current child nodes. The permutation lists the new positions of the original nodes, that is, for nodes [A,B,C,D] and permutation [0,3,1,2], the final order would be [A,C,D,B].

Throws:

IllegalArgumentException - if the permutation is not valid

UnknownTypeException - if this model implementation is not able to perform the reorder for given node type