Enable/disable menu depending on clipboard content availability
/*
* Clipboard example snippet: enable/disable menu depending on clipboard content availability
*
* 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.dnd.Clipboard;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.swt.events.MenuAdapter;
import org.eclipse.swt.events.MenuEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class Snippet122 {
public static void main(String[] args) {
Display display = new Display();
final Clipboard cb = new Clipboard(display);
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Text text = new Text(shell, SWT.BORDER | SWT.MULTI | SWT.WRAP);
Menu menu = new Menu(shell, SWT.POP_UP);
final MenuItem copyItem = new MenuItem(menu, SWT.PUSH);
copyItem.setText("Copy");
copyItem.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
String selection = text.getSelectionText();
if (selection.length() == 0)
return;
Object[] data = new Object[] { selection };
Transfer[] types = new Transfer[] { TextTransfer.getInstance() };
cb.setContents(data, types);
}
});
final MenuItem pasteItem = new MenuItem(menu, SWT.PUSH);
pasteItem.setText("Paste");
pasteItem.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
String string = (String) (cb.getContents(TextTransfer
.getInstance()));
if (string != null)
text.insert(string);
}
});
menu.addMenuListener(new MenuAdapter() {
public void menuShown(MenuEvent e) {
// is copy valid?
String selection = text.getSelectionText();
copyItem.setEnabled(selection.length() > 0);
// is paste valid?
TransferData[] available = cb.getAvailableTypes();
boolean enabled = false;
for (int i = 0; i < available.length; i++) {
if (TextTransfer.getInstance()
.isSupportedType(available[i])) {
enabled = true;
break;
}
}
pasteItem.setEnabled(enabled);
}
});
text.setMenu(menu);
shell.setSize(200, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
cb.dispose();
display.dispose();
}
}
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