SectionInnerPanel.java 文件源码

public synchronized void addFocusListener(FocusListener l) {
    super.addFocusListener(l);
    if (!localFocusListenerInitialized) {
        localFocusListenerInitialized = true;
        Container container = this;
        FocusListener focusListener = localFocusListener;
        addFocusListenerRecursively(container, focusListener);
    }
}