to.etc.domui.component.tree

Interface ITreeNode<T extends ITreeNode<T>>

All Known Implementing Classes:

AbstractTreeNodeBase

public interface ITreeNode<T extends ITreeNode<T>>

Can be used to implement whatever's needed for a ITreeModel.

Author:

Frits Jalvingh Created on Oct 17, 2008

Method Summary

Modifier and Type	Method and Description
T	getChild(int index) Returns the nth child in the parent's list.
int	getChildCount() Returns the #of children for this object.
T	getParent()
boolean	hasChildren() If possible this should quickly decide if this node has children or not.

Method Detail

hasChildren

boolean hasChildren()
             throws Exception

If possible this should quickly decide if this node has children or not. This is used to render an expanded node's state icons. If determining whether a node has children is an expensive option this method should return TRUE always; this causes the state icon to display as if children are available and the user has the possibility to expand that node. At that time we'll call getChildCount() which must determine the #of children. If that returns zero it will at that time properly re-render the state of the node, showing that the node is actually a leaf and cannot be expanded further.

Parameters:

item -

Returns:

Throws:

Exception

getChildCount

int getChildCount()
           throws Exception

Returns the #of children for this object. This must return the actual number.

Parameters:

item -

Returns:

Throws:

Exception

getChild

T getChild(int index)
    throws Exception

Returns the nth child in the parent's list.

Parameters:

parent -

index -

Returns:

Throws:

Exception

getParent

T getParent()
     throws Exception

Throws:

Exception