EditorContextDispatcher.java 文件源码

@Override
public void propertyChange(PropertyChangeEvent evt) {
    String propertyName = evt.getPropertyName();
    if (logger.isLoggable(Level.FINE)) {
        logger.fine("EditorRegistryListener.propertyChange("+propertyName+": "+evt.getOldValue()+" => "+evt.getNewValue()+")");
    }
    if (propertyName.equals(EditorRegistry.FOCUS_LOST_PROPERTY)) {
        Object newFocused = evt.getNewValue();
        if (newFocused instanceof JRootPane) {
            JRootPane root = (JRootPane) newFocused;
            if (root.isAncestorOf((Component) evt.getOldValue())) {
                logger.fine("Focused root.");
                root.addFocusListener(this);
                return;
            }
        }
    }
    if (propertyName.equals(EditorRegistry.FOCUS_GAINED_PROPERTY) ||
        propertyName.equals(EditorRegistry.FOCUS_LOST_PROPERTY) ||
        propertyName.equals(EditorRegistry.FOCUSED_DOCUMENT_PROPERTY)) {

        update(true);
    }
}