/**
* @param group must append its actors through standard {@link WidgetGroup#addActor(Actor)}
* method. Must support {@link WidgetGroup#addActorAfter(Actor, Actor)} and {@link
* WidgetGroup#addActorBefore(Actor, Actor)} methods. Note that {@link
* com.badlogic.gdx.scenes.scene2d.ui.Table} does not meet these requirements.
* @see VerticalGroup
* @see HorizontalGroup
* @see GridGroup
*/
public DragPane(final WidgetGroup group) {
if (group == null) {
throw new IllegalArgumentException("Group cannot be null.");
}
super.setActor(group);
setTouchable(Touchable.enabled);
}
/**
* @param group will replace the internally managed group. All current children will be moved to
* this group.
*/
@Override
public void setActor(final WidgetGroup group) {
if (group == null) {
throw new IllegalArgumentException("Group cannot be null.");
}
final Group previousGroup = getActor();
super.setActor(group);
attachListener(); // Attaches draggable to all previous group children.
for (final Actor child : previousGroup.getChildren()) {
group.addActor(child); // No need to attach draggable, child was already in pane.
}
}