private @Nullable PropertyVetoException vetoFrom(@Nonnull UnexpectedException unexpected) {
Throwable cause = unexpected.getCause();
if (!(cause instanceof PropertyVetoException)) {
return null;
}
return (PropertyVetoException) cause;
}
void updateState(MouseEvent event) {
if (isOld(event)) return;
// childAt and locationOnScreenOf want the tree lock, so be careful not to use any additional
// locks at the same time
// to avoid deadlock.
Point eventScreenLocation = null;
// Determine the current mouse position in screen coordinates
try {
eventScreenLocation = locationOnScreenOf(event.getComponent());
} catch (IllegalComponentStateException e) {
// component might be hidden by the time we process this event
} catch (UnexpectedException e) {
if (!(e.getCause() instanceof IllegalComponentStateException)) throw e;
}
synchronized (this) {
lastEventTime(event);
dragDropInfo.update(event);
mouseInfo.modifiers(modifiers);
mouseInfo.update(event, eventScreenLocation);
modifiers(mouseInfo.modifiers());
}
}