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Class com.trumphurst.controls.TTreeListDocument 

java.lang.Object
   |
   +----com.trumphurst.controls.TDocument
           |
           +----com.trumphurst.controls.TRowDocument
                   |
                   +----com.trumphurst.controls.TTreeListDocument
public class TTreeListDocument
extends TRowDocument
implements KeyListener
A TRowDocument which contains a list of Tree structures. Note that this is a list of tree structures, not a single tree with one root. It was developed to show message threads in a Usenet News reader.

When an item is double-clicked, the item will be expanded to show its children (or contracted, if it is already expanded).

Perhaps, in a pure Document/View architecture, the expand/ contract functionality would be entirely contained in the view. However, this way of doing things works fine, and enables lists of trees to be displayed by the MultiColumnList without a single change to the code.

See Also:
Tree, TMultiColumnList

Constructor Index

o TTreeListDocument(String)

Method Index

o action(int)
The given row has been actioned (double-clicked).
o addElement(Object, int)
Add an object to the list at the specified row.
o contract(int)
Contract the given row.
o expand(int, boolean)
Expand the given row.
o keyPressed(KeyEvent)
Handle standard list keyboard stuff.
o keyReleased(KeyEvent)
o keyTyped(KeyEvent)
o parentIndex(int)
o rootIndex(int)

Constructors

o TTreeListDocument 
 public TTreeListDocument(String name)

Methods

o addElement 
 public void addElement(Object item,
                        int index)
Add an object to the list at the specified row. Overrides the base class, in order to check the item being added is a Tree.

Throws: ClassCastException
If the item being added is not an instance of Tree.
Overrides:
addElement in class TRowDocument
o expand 
 public synchronized int expand(int row,
                                boolean children)
Expand the given row.

Parameters:
row - The row to expand.
children - True if the children are also to be expanded recursively.
Returns:
The row number of tha last row added to the list.
o contract 
 public synchronized void contract(int row)
Contract the given row.

Parameters:
row - The row to contract.
o action 
 public void action(int row)
The given row has been actioned (double-clicked). Expands or contracts the row as necessary.

Parameters:
row - The row actioned.
Overrides:
action in class TRowDocument
o keyPressed 
 public void keyPressed(KeyEvent e)
Handle standard list keyboard stuff.

o keyReleased 
 public void keyReleased(KeyEvent e)
o keyTyped 
 public void keyTyped(KeyEvent e)
o parentIndex 
 public synchronized int parentIndex(int row)
o rootIndex 
 public synchronized int rootIndex(int row)

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