Toolkit.java 文件源码

@Override
public void firePropertyChange(final PropertyChangeEvent evt) {
    Object oldValue = evt.getOldValue();
    Object newValue = evt.getNewValue();
    String propertyName = evt.getPropertyName();
    if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
        return;
    }
    Runnable updater = new Runnable() {
        public void run() {
            PropertyChangeSupport pcs = (PropertyChangeSupport)
                    AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
            if (null != pcs) {
                pcs.firePropertyChange(evt);
            }
        }
    };
    final AppContext currentAppContext = AppContext.getAppContext();
    for (AppContext appContext : AppContext.getAppContexts()) {
        if (null == appContext || appContext.isDisposed()) {
            continue;
        }
        if (currentAppContext == appContext) {
            updater.run();
        } else {
            final PeerEvent e = new PeerEvent(source, updater, PeerEvent.ULTIMATE_PRIORITY_EVENT);
            SunToolkit.postEvent(appContext, e);
        }
    }
}