Capture ctr-z(undo) and ctr-y(redo) within GWT application

Question

I have been writing a web application baased on GWT 2.3 and along with it I have written my own undo and redo functions. When the user presses ctr-z or ctr-y the undoes or redoes the last changes. Is their a way to effectively detect the ctr-z and ctr-y keypress events that occur anywhere on the page and cause them to run my own functions.

Answer 1

Add a NativePreviewHandler:

Event.addNativePreviewHandler(new NativePreviewHandler() {
  @Override
  public void onPreviewNativeEvent(NativePreviewEvent event) {
    if (event.getTypeInt() == Event.ONKEYDOWN) {
      NativeEvent ne = event.getNativeEvent();

      if (ne.getCtrlKey() && ne.getKeyCode() == 'Z') {
        event.cancel();
        // Handle undo
      } else if (ne.getCtrlKey() && ne.getKeyCode() == 'Y') {
        event.cancel();
        // Handle redo
      }
    }
  }
});