How to use

addAll

method

in

com.badlogic.gdx.scenes.scene2d.utils.ArraySelection

if (UIUtils.ctrl() && selection.getMultiple()) {
  selection.clear();
  selection.addAll(items);
  return true;

if (UIUtils.ctrl() && selection.getMultiple()) {
  selection.clear();
  selection.addAll(items);
  return true;

public boolean keyDown (InputEvent event, int keycode) {
  if (keycode == Keys.A && UIUtils.ctrl() && selection.getMultiple()) {
    selection.clear();
    selection.addAll(items);
    return true;
  }
  return false;
}

list.getSelection().addAll(sel);
Ctx.project.setModified();

private void toggleEnabled() {
  if (list.getSelection().size() <= 0)
    return;
  Array<Action> sel = new Array<Action>();
  for (Action a : list.getSelection().toArray()) {
    // CONTROL ACTIONS CAN'T BE DISABLED
    if (a == null || isControlAction(a))
      continue;
    Array<Action> items = list.getItems();
    int pos = items.indexOf(a, true);
    if (a instanceof DisableActionAction) {
      Action a2 = ((DisableActionAction) a).getAction();
      parent.getActions().set(pos, a2);
      items.set(pos, a2);
      sel.add(a2);
    } else {
      DisableActionAction a2 = new DisableActionAction();
      a2.setAction(a);
      parent.getActions().set(pos, a2);
      items.set(pos, a2);
      sel.add(a2);
    }
  }
  Ctx.project.setModified();
  list.getSelection().clear();
  list.getSelection().addAll(sel);
}

private void up() {
  if (parent == null || list.getSelection().size() == 0)
    return;
  Array<Action> sel = new Array<Action>();
  for (Action a : getSortedSelection()) {
    
    int pos = list.getItems().indexOf(a, true);
    if (pos == -1 || pos == 0)
      return;
    Array<Action> items = list.getItems();
    Action e = items.get(pos);
    Action e2 = items.get(pos - 1);
    sel.add(e);
    if (isControlAction(e) && isControlAction(e2)) {
      continue;
    }
    parent.getActions().set(pos - 1, e);
    parent.getActions().set(pos, e2);
    items.set(pos - 1, e);
    items.set(pos, e2);
  }
  list.getSelection().clear();
  list.getSelection().addAll(sel);
  upBtn.setDisabled(list.getSelectedIndex() == 0);
  downBtn.setDisabled(list.getSelectedIndex() == list.getItems().size - 1);
  Ctx.project.setModified();
}

private void down() {
  if (parent == null || list.getSelection().size() == 0)
    return;
  Array<Action> sel = new Array<Action>();
  Array<Action> sortedSelection = getSortedSelection();
  for (int i = sortedSelection.size - 1; i >= 0; i--) {
    int pos = list.getItems().indexOf(sortedSelection.get(i), true);
    Array<Action> items = list.getItems();
    if (pos == -1 || pos == items.size - 1)
      return;
    Action e = items.get(pos);
    Action e2 = items.get(pos + 1);
    sel.add(e);
    if (isControlAction(e) && isControlAction(e2)) {
      continue;
    }
    parent.getActions().set(pos + 1, e);
    parent.getActions().set(pos, e2);
    items.set(pos + 1, e);
    items.set(pos, e2);
  }
  list.getSelection().clear();
  list.getSelection().addAll(sel);
  upBtn.setDisabled(list.getSelectedIndex() == 0);
  downBtn.setDisabled(list.getSelectedIndex() == list.getItems().size - 1);
  Ctx.project.setModified();
}