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package org.eclipse.swt.custom;
/*
* Licensed Materials - Property of IBM,
* (c) Copyright IBM Corp. 1998, 2001 All Rights Reserved
*/
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.events.*;
/**
*
* 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.
*
* <p> Here is an example of using a TreeEditor:
* <code><pre>
* Tree tree = new Tree(parent, SWT.FULL_SELECTION);
* 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
* int index = tree.getSelectionIndex ();
* if (index == -1) return;
* TreeItem item = tree.getItem (index);
*
* // 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 ();
* }
* });
* </pre></code>
*/
public class TreeEditor extends ControlEditor {
Tree tree;
TreeItem item;
TreeListener treeListener;
/**
* Creates a TreeEditor for the specified Tree.
*
* @param tree the Tree Control above which this editor will be displayed
*
*/
public TreeEditor (Tree tree) {
super(tree);
this.tree = tree;
treeListener = new TreeAdapter () {
final Runnable runnable = new Runnable() {
public void run() {
if (TreeEditor.this.tree.isDisposed() || editor == null) return;
resize();
editor.setVisible(true);
}
};
public void treeCollapsed(TreeEvent e) {
if (editor == null) return;
editor.setVisible(false);
Display display = TreeEditor.this.tree.getDisplay();
display.asyncExec(runnable);
}
public void treeExpanded(TreeEvent e) {
if (editor == null) return;
editor.setVisible(false);
Display display = TreeEditor.this.tree.getDisplay();
display.asyncExec(runnable);
}
};
tree.addTreeListener(treeListener);
}
Rectangle computeBounds () {
if (item == null || item.isDisposed()) return new Rectangle(0, 0, 0, 0);
Rectangle cell = item.getBounds();
Rectangle area = tree.getClientArea();
if (cell.x < area.x + area.width) {
if (cell.x + cell.width > area.x + area.width) {
cell.width = area.x + area.width - cell.x;
}
}
Rectangle editorRect = new Rectangle(cell.x, cell.y, minimumWidth, cell.height);
if (grabHorizontal) {
editorRect.width = Math.max(area.x + area.width - cell.x, minimumWidth);
}
if (horizontalAlignment == SWT.RIGHT) {
editorRect.x = Math.max(cell.x, cell.x + cell.width - editorRect.width);
} else if (horizontalAlignment == SWT.LEFT) {
// do nothing - cell.x is the right answer
} else { // default is CENTER
editorRect.x = Math.max(cell.x, cell.x + (cell.width - editorRect.width)/2);
}
return editorRect;
}
/**
* Removes all associations between the TreeEditor and the cell in the tree. The
* tree and the editor Control are <b>not</b> disposed.
*/
public void dispose () {
if (treeListener != null)
tree.removeTreeListener(treeListener);
treeListener = null;
tree = null;
item = null;
super.dispose();
}
/**
* Returns the TreeItem for the row of the cell being tracked by this editor.
*
* @return the TreeItem for the row of the cell being tracked by this editor
*/
public TreeItem getItem () {
return item;
}
public void setItem (TreeItem item) {
this.item = item;
}
/**
* Specify the Control that is to be displayed and the cell in the tree that it is to be positioned above.
*
* <p>Note: The Control provided as the editor <b>must</b> be created with its parent being the Tree control
* specified in the TreeEditor constructor.
*
* @param editor the Control that is displayed above the cell being edited
* @param item the TreeItem for the row of the cell being tracked by this editor
* @param column the zero based index of the column of the cell being tracked by this editor
*/
public void setEditor (Control editor, TreeItem item) {
setItem (item);
super.setEditor (editor);
}
public void setEditor (Control editor) {
TreeItem item = null;
if (tree.getItemCount() != 0) {
item = tree.getItems()[0];
}
this.setEditor(editor, item);
}
}
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