org.eclipse.swt.custom
Class TreeEditor

java.lang.Object
  |
  +--org.eclipse.swt.custom.ControlEditor
        |
        +--org.eclipse.swt.custom.TreeEditor

public class TreeEditor

extends ControlEditor

A TreeEditor is a manager for a Control that appears above a cell in a Tree and tracks with the moving and resizing of that cell. It can be used to display a text widget above a cell in a Tree so that the user can edit the contents of that cell. It can also be used to display a button that can launch a dialog for modifying the contents of the associated cell.

Here is an example of using a TreeEditor:

 final Tree tree = new Tree(parent, SWT.FULL_SELECTION);
 final TreeEditor editor = new TreeEditor (tree);
 tree.addSelectionListener (new SelectionAdapter() {
	public void widgetSelected(SelectionEvent e) {

		// Clean up any previous editor control
		Control oldEditor = editor.getEditor();
		if (oldEditor != null)
			oldEditor.dispose();	

		// Identify the selected row
		TreeItem item = (TreeItem)e.item;

		// The control that will be the editor must be a child of the Tree
		Text text = new Text(tree, SWT.NONE);

		//The text editor must have the same size as the cell and must
		//not be any smaller than 50 pixels.
		editor.horizontalAlignment = SWT.LEFT;
		editor.grabHorizontal = true;
		editor.minimumWidth = 50;

		// Open the text editor on the selected row.
		editor.setEditor (text, item);

		// Assign focus to the text control
		text.setFocus ();
	}
 });
 

Field Summary

Fields inherited from class org.eclipse.swt.custom.ControlEditor

grabHorizontal, grabVertical, horizontalAlignment, minimumHeight, minimumWidth, verticalAlignment

Constructor Summary

TreeEditor(Tree tree)
Creates a TreeEditor for the specified Tree.

Method Summary

void	dispose() Removes all associations between the TreeEditor and the cell in the tree.
TreeItem	getItem() Returns the TreeItem for the row of the cell being tracked by this editor.
void	setEditor(Control editor, TreeItem item) Specify the Control that is to be displayed and the cell in the tree that it is to be positioned above.
void	setItem(TreeItem item)

Methods inherited from class org.eclipse.swt.custom.ControlEditor

getEditor, setEditor

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TreeEditor

public TreeEditor(Tree tree)

Creates a TreeEditor for the specified Tree.

Parameters:

tree - the Tree Control above which this editor will be displayed

Method Detail

dispose

public void dispose()

Removes all associations between the TreeEditor and the cell in the tree. The tree and the editor Control are not disposed.

Overrides:

dispose in class ControlEditor

getItem

public TreeItem getItem()

Returns the TreeItem for the row of the cell being tracked by this editor.

Returns:

the TreeItem for the row of the cell being tracked by this editor

setItem

public void setItem(TreeItem item)

setEditor

public void setEditor(Control editor,
                      TreeItem item)

Specify the Control that is to be displayed and the cell in the tree that it is to be positioned above.

Note: The Control provided as the editor must be created with its parent being the Tree control specified in the TreeEditor constructor.

Parameters:

editor - the Control that is displayed above the cell being edited

item - the TreeItem for the row of the cell being tracked by this editor