TreeExpansionModel (Tapestry API - 5.7.2)

All Known Implementing Classes:

DefaultTreeExpansionModel
```
public interface TreeExpansionModel<T>
```
Tracks which nodes of a TreeModel are currently expanded. The default implementation simply stores a set of unique node ids to identify expanded nodes. The expansion model is updated whenever folders are expanded or collapsed on the client side.

Since:

5.3

See Also:

Tree

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`clear()`	Marks all nodes as collapsed.
`boolean`	`isExpanded(TreeNode<T> node)`	Returns true if the node has been previously expanded.
`void`	`markCollapsed(TreeNode<T> node)`	Marks the node as collapsed (not expanded).
`void`	`markExpanded(TreeNode<T> node)`	Marks the node as expanded.

- Method Detail
  - isExpanded
```
boolean isExpanded(TreeNode<T> node)
```
    Returns true if the node has been previously expanded.
    
    Parameters:
    
    node - node to check for expansion
    
    Returns:
    
    true if expanded
  - markExpanded
```
void markExpanded(TreeNode<T> node)
```
    Marks the node as expanded.
  - markCollapsed
```
void markCollapsed(TreeNode<T> node)
```
    Marks the node as collapsed (not expanded).
  - clear
```
void clear()
```
    Marks all nodes as collapsed.