RTextAreaEditorKit.java 文件源码

@Override
public void actionPerformedImpl(ActionEvent e, RTextArea textArea) {
    Gutter gutter = RSyntaxUtilities.getGutter(textArea);
    if (gutter!=null) {
        int line = textArea.getCaretLineNumber();
        try {
            gutter.toggleBookmark(line);
        } catch (BadLocationException ble) { // Never happens
            UIManager.getLookAndFeel().
                        provideErrorFeedback(textArea);
            ble.printStackTrace();
        }
    }
}