Package com.google.gwt.user.cellview.client

Interface TreeNode

All Known Implementing Classes:

CellBrowser.TreeNodeImpl, CellTreeNodeView.TreeNodeImpl

public interface TreeNode

A representation of a node in a tree.

Method Summary

Modifier and Type	Method	Description
int	getChildCount()	Get the number of children of the node.
Object	getChildValue(int index)	Get the value associated with a child node.
int	getIndex()	Get the index of the current node relative to its parent.
TreeNode	getParent()	Get the parent node of this node.
Object	getValue()	Get the value associated with this node.
boolean	isChildLeaf(int index)	Check whether or not a child node is a leaf node.
boolean	isChildOpen(int index)	Check whether or not a child node is open.
boolean	isDestroyed()	Check whether or not the current node is destroyed.
TreeNode	setChildOpen(int index, boolean open)	Open or close a child node and fire an event.
TreeNode	setChildOpen(int index, boolean open, boolean fireEvents)	Open or close the node, optionally firing an event.

Method Details

getChildCount

int getChildCount()

Get the number of children of the node.

Returns:

the child count

getChildValue

Object getChildValue(int index)

Get the value associated with a child node.

Parameters:

index - the child index

Returns:

the value

getIndex

int getIndex()

Get the index of the current node relative to its parent.

Returns:

the index of the current node

getParent

TreeNode getParent()

Get the parent node of this node.

Returns:

the parent node, or null if this node is the root node

getValue

Object getValue()

Get the value associated with this node. This method can be called on destroyed nodes.

Returns:

the value

isChildLeaf

boolean isChildLeaf(int index)

Check whether or not a child node is a leaf node.

Parameters:

index - the index of the child

Returns:

true if a leaf node, false if not

isChildOpen

boolean isChildOpen(int index)

Check whether or not a child node is open.

Parameters:

index - the index of the child

Returns:

true if open, false if closed

isDestroyed

boolean isDestroyed()

Check whether or not the current node is destroyed. The node is destroyed when it is closed, even if it still appears in the tree as an unopened non-leaf node. Once a node is destroyed, calling most methods on the node results in an IllegalStateException.

Returns:

true if destroyed, false if active

setChildOpen

TreeNode setChildOpen(int index,
 boolean open)

Open or close a child node and fire an event. If open is true and the TreeNode successfully opens, returns the child TreeNode. Delegates to setChildOpen(int,boolean, boolean).

Parameters:

index - the index of the child

open - true to open, false to close

Returns:

the TreeNode that was opened, or null if the node was closed or could not be opened

setChildOpen

TreeNode setChildOpen(int index,
 boolean open,
 boolean fireEvents)

Open or close the node, optionally firing an event. If open is true and the TreeNode successfully opens, returns the child TreeNode.

Parameters:

index - the index of the child

open - true to open, false to flose

fireEvents - true to fire an event, false not to

Returns:

the TreeNode that was opened, or null if the node was closed or could not be opened