/**
* Copies the selected text to the clipboard.
*
* @return true if text was copied
*/
final boolean copy() {
final String txt = text.copy();
if (txt.isEmpty()) {
text.noMark();
return false;
}
// copy selection to clipboard
final Clipboard clip = Toolkit.getDefaultToolkit().getSystemClipboard();
clip.setContents(new StringSelection(txt), null);
return true;
}