在JTextArea下面添加按钮

Question

我试图在JTextArea使用Eclipse WindowBuilder 下面添加两个按钮,但我不能.我试图改变布局,但我找不到一种方法来添加我想要的按钮,并以JTextArea一种简单的方式重新调整大小.

public TestScrollPane03() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                JTextArea textArea = new JTextArea(100, 50);
                JScrollPane scrollPane = new JScrollPane(textArea);
                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(scrollPane);
                frame.setSize(200, 200);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    } 

我如何在原版下方添加按钮textArea？

Answer 1

您需要有两个面板,一个用于您的textArea,一个用于输入(在本例中为按钮).我觉得这样的东西就是你要找的东西:

public class Test
{
    public static void createFrame()
    {
        EventQueue.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                JPanel panel = new JPanel();
                panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
                panel.setOpaque(true);
                JTextArea textArea = new JTextArea(15, 50);
                textArea.setWrapStyleWord(true);
                textArea.setEditable(false);
                textArea.setFont(Font.getFont(Font.SANS_SERIF));
                JScrollPane scroller = new JScrollPane(textArea);
                scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
                scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
                JPanel inputpanel = new JPanel();
                inputpanel.setLayout(new FlowLayout());
                JTextField input = new JTextField(20);
                JButton button = new JButton("Enter");
                DefaultCaret caret = (DefaultCaret) textArea.getCaret();
                caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
                panel.add(scroller);
                inputpanel.add(input);
                inputpanel.add(button);
                panel.add(inputpanel);
                frame.getContentPane().add(BorderLayout.CENTER, panel);
                frame.pack();
                frame.setLocationByPlatform(true);
                frame.setVisible(true);
                frame.setResizable(false);
                input.requestFocus();
            }
        });
    }

    public static void main(String... args)
    {
        createFrame();
    }
}

如果您希望您的框架看起来更像您正在运行的操作系统,您可以.setLookAndFeel()在frame显示之前添加:

try 
{
    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
    e.printStackTrace();
}

添加UIManager外观的东西(特别是小一点):