Enable menu items dynamically (when menu shown)
/*
* Menu example snippet: enable menu items dynamically (when menu shown)
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
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 Snippet73 {
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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