Mega Code Archive
Enable menu items dynamically (when menu shown)
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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class MenuItemEnableDynamically {
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI);
final Menu menu = new Menu(shell, SWT.POP_UP);
tree.setMenu(menu);
for (int i = 0; i < 12; i++) {
TreeItem treeItem = new TreeItem(tree, SWT.NONE);
treeItem.setText("Item " + i);
MenuItem menuItem = new MenuItem(menu, SWT.PUSH);
menuItem.setText(treeItem.getText());
}
menu.addListener(SWT.Show, new Listener() {
public void handleEvent(Event event) {
MenuItem[] menuItems = menu.getItems();
TreeItem[] treeItems = tree.getSelection();
for (int i = 0; i < menuItems.length; i++) {
String text = menuItems[i].getText();
int index = 0;
while (index < treeItems.length) {
if (treeItems[index].getText().equals(text))
break;
index++;
}
menuItems[i].setEnabled(index != treeItems.length);
}
}
});
tree.setSize(200, 200);
shell.setSize(300, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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