[GridBagLayout Swing中的JSpinners和JButton

Question

这是我的代码，用于创建我的消息面板：

private class MessagePane extends JPanel {
    private MessagePane() {
        setLayout(new GridBagLayout());
        setBackground(backgroundColor);
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.insets = new Insets(4, 4, 4, 4);

        add(allowButton, gbc);
        gbc.gridx = 1;
        add(blockButton, gbc);

        gbc.gridwidth = 2;
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.weightx = 1;
        gbc.weighty = 1;
        add(timerL, gbc);
        gbc.fill = GridBagConstraints.BOTH;
        add(new JScrollPane(messageArea), gbc);

        gbc = new GridBagConstraints();
        gbc.gridy = 2;
        gbc.gridx = 0;
        add(countryList, gbc);

        gbc.gridx = 1;
        add(msgList, gbc);

        gbc.gridx = 2;
        add(sendButton, gbc);

        setVisible(true);
    }
}

并且此视图看起来像：

我想实现的观点：

您能帮我吗？

Answer 1

您没有正确设置gbc约束宽度，但是尽管如此，对于此GUI，我不会使用GridBagLayout。我会：

• 将BorderLayout用于整个JPanel
• 使用带有1行2列的GridLayout将顶部按钮添加到JPanel，其间有一些空格
• 将该JPanel放入主JPanel BorderLayout.PAGE_START
• 放置中央组件BorderLayout.CENTER
• 使用沿着一行（不是页面）定向的BoxLayout为底部创建一个JPanel
• 将其添加到主JPanel BorderLayout.PAGE_END

Answer 2

气垫船充满鳗鱼提出了一个好的策略，但是我希望这也可以完全使用GBL来完成。只是使每一行的列跨度正确即可。我在想，每行应该有4列宽度，用作：

• 绿色带边框的区域：1列跨度。
• 红色带边框的区域：2列跨度。
• Blue边框区域：4列跨度。

如果需要更多帮助，请发布一个可编译的示例。

Answer 3

我使用GridBagLayout创建了以下GUI。

我必须将顶部的两个按钮放在自己的JPanel中，以便它们的大小相同。我在按钮面板和主面板上都使用了GridBagLayout。

我为每个Swing组件创建了一个GridBagConstraints。这样，我可以按自己的意愿设置插图，并可以为每个组件指定不同的锚点和填充。

我不得不猜测OP使用了哪个Swing组件，因为他发布的代码中没有定义它们。

这是生成GUI的完整，可运行的示例。

import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSpinner;
import javax.swing.JTextArea;
import javax.swing.SpinnerListModel;
import javax.swing.SwingUtilities;

public class MessageApplication implements Runnable {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new MessageApplication());
    }

    @Override
    public void run() {
        JFrame frame = new JFrame("Message Panel");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(new MessagePanel().getPanel());
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public class MessagePanel {

        private JPanel panel;

        public MessagePanel() {
            // top, left, bottom, right
            Insets topLeftInsets = new Insets(10, 10, 10, 10);
            Insets topInsets = new Insets(10, 0, 10, 10);
            Insets leftInsets = new Insets(0, 10, 10, 10);
            Insets insets = new Insets(0, 0, 10, 10);
            Insets messageInsets = new Insets(2, 4, 2, 4);
            Insets zeroInsets = new Insets(0, 0, 0, 0);

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

            int gridy = 0;

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

            JButton allowButton = new JButton("ALLOW");
            addComponent(buttonPanel, allowButton, 0, gridy, 1, 1, 
                    topLeftInsets, GridBagConstraints.CENTER,
                    GridBagConstraints.HORIZONTAL);

            JButton blockButton = new JButton("BLOCK");
            addComponent(buttonPanel, blockButton, 1, gridy, 1, 1, 
                    topInsets, GridBagConstraints.CENTER,
                    GridBagConstraints.HORIZONTAL);

            addComponent(panel, buttonPanel, 0, gridy++, 6, 1, 
                    zeroInsets, GridBagConstraints.CENTER,
                    GridBagConstraints.HORIZONTAL);

            JTextArea messageArea = new JTextArea(12, 30);
            messageArea.setEditable(false);
            messageArea.setMargin(messageInsets);
            messageArea.setText("I'm a message area.");
            JScrollPane scrollPane = 
                    new JScrollPane(messageArea);
            addComponent(panel, scrollPane, 0, gridy++, 6, 1, 
                    leftInsets, GridBagConstraints.CENTER,
                    GridBagConstraints.HORIZONTAL);

            String[] countryStrings = { "US", "CA" };
            SpinnerListModel countryModel = 
                    new SpinnerListModel(countryStrings);
            JSpinner countryList = new JSpinner(countryModel);
            addComponent(panel, countryList, 0, gridy, 1, 1, 
                    leftInsets, GridBagConstraints.CENTER,
                    GridBagConstraints.HORIZONTAL);

            String[] msgStrings = { "Message to the client", 
                    "Message to the shipper" };
            SpinnerListModel msgModel = 
                    new SpinnerListModel(msgStrings);
            JSpinner msgList = new JSpinner(msgModel);
            addComponent(panel, msgList, 1, gridy, 4, 1, 
                    insets, GridBagConstraints.CENTER,
                    GridBagConstraints.HORIZONTAL);

            JButton sendButton = new JButton("SEND");
            addComponent(panel, sendButton, 5, gridy++, 1, 1, 
                    insets, GridBagConstraints.CENTER,
                    GridBagConstraints.HORIZONTAL);
        }

        private void addComponent(Container container, 
                Component component, int gridx, int gridy, 
                int gridwidth, int gridheight, Insets insets, 
                int anchor, int fill) {
            GridBagConstraints gbc = new GridBagConstraints(
                    gridx, gridy, gridwidth, gridheight, 
                    1.0, 1.0, anchor, fill, insets, 0, 0);
            container.add(component, gbc);
        }


        public JPanel getPanel() {
            return panel;
        }

    }

}