TreeView.java 文件源码

/**
 * Adds a TextListener event listener.
 *
 * @param listener  The listener to add.
 *
 * @see #removeTextListener
 */
public void addTextListener(TextListener listener) {

    // is there anything to do?
    if (listener == null)
        return;

    if (textListeners == null)
       textListeners = new Vector();

    // add listener
    textListeners.addElement(listener);
    }