java - 如何在JAVA中设置SWING窗口的尺寸

Question

这就是我启动窗口时的样子:

这就是我想要的:

这是我使用过的代码:

主要:

public void main()
{
    SwingUtilities.invokeLater(new Runnable()
    {   
        @Override
        public void run()
        {
            createAndShowGui();
        }
    });

}

创建并显示 GUI

public static void createAndShowGui()
{
    Frame chatPanel = new Frame();
    JFrame frame = new JFrame("Chat");

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(chatPanel);
    //Ensure the frame is the minimum size it needs to display properly 
    frame.pack();
    frame.setLocationByPlatform(true);
    frame.setVisible(true);
}

框架

public class Frame extends JPanel implements ActionListener
{

public static JTextArea textArea_send = new JTextArea(5, 14);
public static JTextArea textArea_receive = new JTextArea(15, 20);

private JButton send_button = new JButton("Send");

private JLabel receiver = new JLabel("Salon");


public Frame()
{
    //Set the frame icon to an image loaded from a file.
    //this.setIconImage(new ImageIcon(url).getImage());

    JPanel AreaGrid = new JPanel();
    AreaGrid.setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();

    gbc.gridx = gbc.gridy = 0; =

    gbc.gridwidth = GridBagConstraints.REMAINDER; =
    gbc.gridheight = 1;
    gbc.anchor = GridBagConstraints.LINE_START;
    gbc.insets = new Insets(10, 15, 0, 0); 
    this.add(receiver, gbc);

    /* Next component*/
    gbc.gridx = 0;
    gbc.gridy = 1;

    gbc.weightx = 1.;
    gbc.weighty = 1.;

    gbc.fill = GridBagConstraints.BOTH;
    gbc.anchor = GridBagConstraints.LINE_START; // pas WEST.

    gbc.insets = new Insets(30, 15, 0, 10);
    this.add(new JScrollPane(textArea_receive, 
            JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
            JScrollPane.HORIZONTAL_SCROLLBAR_NEVER), gbc);


    /* next component */
    gbc.gridx = 0;
    gbc.gridy = 1;

    gbc.gridwidth = GridBagConstraints.WEST;

    gbc.fill = GridBagConstraints.HORIZONTAL;

    gbc.anchor = GridBagConstraints.BASELINE;

    gbc.insets = new Insets(15, 15, 15, 10);
    this.add(new JScrollPane(textArea_send,
            JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
            JScrollPane.HORIZONTAL_SCROLLBAR_NEVER), gbc);

    /* Button */
    gbc.gridx = 1; 
    this.add(send_button);


    textArea_receive.setEditable(false);
    textArea_send.setEditable(true);
    send_button.addActionListener(this);

    DefaultCaret caret = (DefaultCaret)textArea_receive.getCaret();
    caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);

}

我希望我的窗口保持这样的组织，如果我们扩大或缩小它，只有两个文本区域会改变大小。目前，文本区域不会调整大小。

欢迎任何建议!

提前致谢，

维克多

Answer 1

您的类扩展了JPanel。 JPanel 的默认布局管理器是 FlowLayout，这就是组件按原样显示的原因。

JPanel AreaGrid = new JPanel();
AreaGrid.setLayout(new GridBagLayout());

上面的代码没有执行任何操作，因为您从未向“areaGrid”面板添加任何组件。摆脱那些陈述。

您需要做的是设置类本身的布局，因为您将所有组件直接添加到自定义类中:

//JPanel AreaGrid = new JPanel();
//AreaGrid.setLayout(new GridBagLayout());
this.setLayout( new GridBagLayout() );