在java windowbuilder中添加动态复选框

【问题标题】：add dynamic checkbox in java windowbuilder在java windowbuilder中添加动态复选框
【发布时间】：2018-10-09 14:28:32
【问题描述】：

我想在组合框中选择一个项目后添加一个动态复选框。 我正在研究 Eclipse 并在窗口构建器上设计我的框架。

    final JComboBox<String> comboBox = new JComboBox<String>();
    comboBox.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            String typeName = comboBox.getSelectedItem().toString();
            for (int i = 0; i < SqlQuery.getCoursesName(typeName).size(); i++) {
                JCheckBox c = new JCheckBox(SqlQuery.getCoursesName(typeName).get(i));
                c.setVisible(true);
                coursePanel.add(c);

                frame.repaint();
                frame.validate();

                System.out.println(c.getText());
            }
        }
    });
    comboBox.setBounds(208, 221, 91, 20);
    frame.getContentPane().add(comboBox);

编辑：这是我的完整代码。

public class registerForm { 
private JFrame frame;
private JTextField txtFirstName;
private JTextField txtLastName;
private JTextField txtPassword;
private JTextField txtEmail;

List<Integer> coursesId; // ן¿½ן¿½ן¿½ן¿½ן¿½ ן¿½ן¿½ ן¿½ן¿½ן¿½ן¿½ן¿½ ן¿½ן¿½ ן¿½ן¿½ן¿½ן¿½ן¿½ן¿½

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                registerForm window = new registerForm();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the application.
 */
public registerForm() {
    initialize();
}

/**
 * Initialize the contents of the frame.
 */
private void initialize() {
    frame = new JFrame();
    frame.setBounds(100, 100, 450, 442);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(null);

    JLabel lblNewLabel = new JLabel("\u05D4\u05E8\u05E9\u05DE\u05D4");
    lblNewLabel.setBounds(165, 11, 91, 29);
    lblNewLabel.setFont(new Font("Tahoma", Font.BOLD, 24));
    frame.getContentPane().add(lblNewLabel);

    JLabel label = new JLabel("\u05E9\u05DD \u05E4\u05E8\u05D8\u05D9:");
    label.setBounds(363, 55, 61, 14);
    label.setFont(new Font("Tahoma", Font.PLAIN, 14));
    frame.getContentPane().add(label);

    txtFirstName = new JTextField();
    txtFirstName.setBounds(75, 51, 221, 20);
    frame.getContentPane().add(txtFirstName);
    txtFirstName.setColumns(10);

    JLabel label_1 = new JLabel("\u05E9\u05DD \u05DE\u05E9\u05E4\u05D7\u05D4:");
    label_1.setBounds(344, 80, 80, 14);
    label_1.setFont(new Font("Tahoma", Font.PLAIN, 14));
    frame.getContentPane().add(label_1);

    txtLastName = new JTextField();
    txtLastName.setBounds(75, 82, 221, 20);
    txtLastName.setColumns(10);
    frame.getContentPane().add(txtLastName);

    txtPassword = new JTextField();
    txtPassword.setBounds(75, 140, 221, 20);
    txtPassword.setColumns(10);
    frame.getContentPane().add(txtPassword);

    JLabel label_2 = new JLabel("\u05DE\u05D9\u05D9\u05DC:");
    label_2.setBounds(392, 110, 32, 14);
    label_2.setFont(new Font("Tahoma", Font.PLAIN, 14));
    frame.getContentPane().add(label_2);

    txtEmail = new JTextField();
    txtEmail.setBounds(75, 109, 221, 20);
    txtEmail.setColumns(10);
    frame.getContentPane().add(txtEmail);

    JLabel label_3 = new JLabel("\u05E1\u05D9\u05E1\u05DE\u05D0:");
    label_3.setBounds(373, 141, 51, 14);
    label_3.setFont(new Font("Tahoma", Font.PLAIN, 14));
    frame.getContentPane().add(label_3);

    final JDateChooser dateChooser = new JDateChooser();
    dateChooser.setBounds(75, 171, 221, 39);
    frame.getContentPane().add(dateChooser);

    JLabel label_4 = new JLabel("\u05EA\u05D0\u05E8\u05D9\u05DA \u05DC\u05D9\u05D3\u05D4:");
    label_4.setBounds(344, 167, 90, 14);
    label_4.setFont(new Font("Tahoma", Font.PLAIN, 14));
    frame.getContentPane().add(label_4);

    JButton btnSend = new JButton("\u05E9\u05DC\u05D7");
    btnSend.setBounds(258, 334, 61, 58);
    btnSend.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {

            // date
            Date date = new Date(dateChooser.getDate().getTime());
        }
    });
    frame.getContentPane().add(btnSend);

    JButton button = new JButton("\u05E0\u05E7\u05D4");
    button.setBounds(175, 334, 61, 58);
    frame.getContentPane().add(button);

    JLabel label_5 = new JLabel("\u05DE\u05D2\u05DE\u05D4:");
    label_5.setFont(new Font("Tahoma", Font.PLAIN, 14));
    label_5.setBounds(382, 218, 42, 14);
    frame.getContentPane().add(label_5);

    final JPanel coursePanel = new JPanel();
    coursePanel.setBounds(10, 249, 286, 74);
    frame.getContentPane().add(coursePanel);
    coursePanel.setLayout(null);

    final JComboBox<String> comboBox = new JComboBox<String>();
    comboBox.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            String typeName = comboBox.getSelectedItem().toString();
            for (int i = 0; i < SqlQuery.getCoursesName(typeName).size(); i++) {
                JCheckBox c = new JCheckBox(SqlQuery.getCoursesName(typeName).get(i));
                int selectedIndex = comboBox.getSelectedIndex();
                boolean isInPanel = c.getParent() == coursePanel;
                if (selectedIndex == 1 && !isInPanel) {
                    coursePanel.add(c);
                    coursePanel.repaint(); //Repaint the proper panel that has this component.
                    coursePanel.revalidate();
                } else if (isInPanel && selectedIndex != 1) {
                    coursePanel.remove(c);
                    coursePanel.repaint(); //Repaint the proper panel that has this component.
                    coursePanel.revalidate();
                }
                coursePanel.repaint();
                coursePanel.validate();

                System.out.println(c.getText());
            }
        }
    });
    comboBox.setBounds(208, 221, 91, 20);
    frame.getContentPane().add(comboBox);
    // fill comboBox
    List<String> lst = SqlQuery.getTypes();
    for (int i = 0; i < lst.size(); i++)
        comboBox.addItem(lst.get(i));

    JLabel label_6 = new JLabel("\u05E9\u05DC\u05D9\u05D8\u05D4 \u05D1\u05E7\u05D5\u05E8\u05E1\u05D9\u05DD");
    label_6.setFont(new Font("Tahoma", Font.PLAIN, 14));
    label_6.setBounds(321, 245, 103, 14);
    frame.getContentPane().add(label_6);



}

}

希望你能理解我写的内容。单击组合框后，我想显示课程名称列表。 为什么框架不显示复选框？ 谢谢。

【问题讨论】：

    标签： java eclipse checkbox dynamic windowsbuilder


    【解决方案1】：

    首先。 comboBox.setBounds() 是一个非常糟糕的做法。花点时间看看Layout Managers。由于您指的是 Swing 库，因此还要在您的帖子中添加“swing”标签。

    框架未显示组件，因为您重新绘制了错误的组件。您在 coursePanel 中添加复选框，这意味着您必须 repaint() & revalidate() coursePanel。所以coursePanel.repaint() 而不是frame.repaint() 会帮助你。

    也不需要checkBox.setVisible(true)，因为默认情况下复选框是可见的。

    最后我添加了我将如何做的方式。

    package test;

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Test {

    private JFrame frame;
    private JCheckBox checkBox;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Test window = new Test();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public Test() {
        frame = new JFrame();
        frame.setPreferredSize(new Dimension(300, 300));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(createPanel());
        frame.pack();
    }

    private JPanel createPanel() {
        JPanel p = new JPanel(new FlowLayout());
        checkBox = new JCheckBox("I am a checkbox"); //Create the checkbox
        JComboBox<String> combo = new JComboBox<>();
        combo.addItem("Hello");
        combo.addItem("Stack");
        combo.addItem("OverFlow");
        combo.addActionListener(e -> {
            //Its better to handle indices when there is not dynmic data to your combobox
            int selectedIndex = combo.getSelectedIndex();
            boolean isInPanel = checkBox.getParent() == p;
            if (selectedIndex == 1 && !isInPanel) {
                p.add(checkBox);
                p.repaint(); //Repaint the proper panel that has this component.
                p.revalidate();
            } else if (isInPanel && selectedIndex != 1) {
                p.remove(checkBox);
                p.repaint(); //Repaint the proper panel that has this component.
                p.revalidate();
            }

        });
        p.add(combo);
        return p;
    }
}

    在 cmets 之后您的问题的答案（使复选框可见）：

    import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class registerForm {
    private JFrame frame;
    private JTextField txtFirstName;
    private JTextField txtLastName;
    private JTextField txtPassword;
    private JTextField txtEmail;
    private JCheckBox checkBox;

    List<Integer> coursesId; // ן¿½ן¿½ן¿½ן¿½ן¿½ ן¿½ן¿½ ן¿½ן¿½ן¿½ן¿½ן¿½ ן¿½ן¿½ ן¿½ן¿½ן¿½ן¿½ן¿½ן¿½

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    registerForm window = new registerForm();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public registerForm() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 450, 442);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        JLabel lblNewLabel = new JLabel("\u05D4\u05E8\u05E9\u05DE\u05D4");
        lblNewLabel.setBounds(165, 11, 91, 29);
        lblNewLabel.setFont(new Font("Tahoma", Font.BOLD, 24));
        frame.getContentPane().add(lblNewLabel);

        JLabel label = new JLabel("\u05E9\u05DD \u05E4\u05E8\u05D8\u05D9:");
        label.setBounds(363, 55, 61, 14);
        label.setFont(new Font("Tahoma", Font.PLAIN, 14));
        frame.getContentPane().add(label);

        txtFirstName = new JTextField();
        txtFirstName.setBounds(75, 51, 221, 20);
        frame.getContentPane().add(txtFirstName);
        txtFirstName.setColumns(10);

        JLabel label_1 = new JLabel("\u05E9\u05DD \u05DE\u05E9\u05E4\u05D7\u05D4:");
        label_1.setBounds(344, 80, 80, 14);
        label_1.setFont(new Font("Tahoma", Font.PLAIN, 14));
        frame.getContentPane().add(label_1);

        txtLastName = new JTextField();
        txtLastName.setBounds(75, 82, 221, 20);
        txtLastName.setColumns(10);
        frame.getContentPane().add(txtLastName);

        txtPassword = new JTextField();
        txtPassword.setBounds(75, 140, 221, 20);
        txtPassword.setColumns(10);
        frame.getContentPane().add(txtPassword);

        JLabel label_2 = new JLabel("\u05DE\u05D9\u05D9\u05DC:");
        label_2.setBounds(392, 110, 32, 14);
        label_2.setFont(new Font("Tahoma", Font.PLAIN, 14));
        frame.getContentPane().add(label_2);

        txtEmail = new JTextField();
        txtEmail.setBounds(75, 109, 221, 20);
        txtEmail.setColumns(10);
        frame.getContentPane().add(txtEmail);

        JLabel label_3 = new JLabel("\u05E1\u05D9\u05E1\u05DE\u05D0:");
        label_3.setBounds(373, 141, 51, 14);
        label_3.setFont(new Font("Tahoma", Font.PLAIN, 14));
        frame.getContentPane().add(label_3);


        JLabel label_4 = new JLabel("\u05EA\u05D0\u05E8\u05D9\u05DA \u05DC\u05D9\u05D3\u05D4:");
        label_4.setBounds(344, 167, 90, 14);
        label_4.setFont(new Font("Tahoma", Font.PLAIN, 14));
        frame.getContentPane().add(label_4);


        JButton button = new JButton("\u05E0\u05E7\u05D4");
        button.setBounds(175, 334, 61, 58);
        frame.getContentPane().add(button);

        JLabel label_5 = new JLabel("\u05DE\u05D2\u05DE\u05D4:");
        label_5.setFont(new Font("Tahoma", Font.PLAIN, 14));
        label_5.setBounds(382, 218, 42, 14);
        frame.getContentPane().add(label_5);

        final JPanel coursePanel = new JPanel();
        coursePanel.setBounds(10, 249, 286, 74);
        frame.getContentPane().add(coursePanel);
        coursePanel.setLayout(null);
        List<String> lst = new ArrayList<>();
        lst.add("Hello");
        lst.add("Stack");
        lst.add("Over");
        lst.add("Flow");
        //Prepare the checkBox
        checkBox = new JCheckBox("nothing");
        final JComboBox<String> comboBox = new JComboBox<String>();
        comboBox.addActionListener(new ActionListener() {


            public void actionPerformed(ActionEvent e) {
                String typeName = comboBox.getSelectedItem().toString();
                for (int i = 0; i < lst.size(); i++) {
                    checkBox.setText(typeName);
                    //set the same bounds as comboBox but reduce its X by 80.
                    //Compare checkBoxbounds and combobox bounds
                    //Remind: setBounds is baaaaad practice.
                    checkBox.setBounds(128, 221, 91, 20);
                    //if you want to add it in coursePanel, change all frame.getContentPane() to coursePanel
                    int selectedIndex = comboBox.getSelectedIndex();
                    boolean isInPanel = checkBox.getParent() == frame.getContentPane(); 
                    if (selectedIndex == 1 && !isInPanel) {

                        frame.getContentPane().add(checkBox);
                    } else if (isInPanel && selectedIndex != 1) {
                        frame.getContentPane().remove(checkBox);
                    }
                    frame.getContentPane().repaint();
                    frame.getContentPane().validate();

                    System.out.println(checkBox.getText());
                }
            }
        });
        comboBox.setBounds(208, 221, 91, 20);
        frame.getContentPane().add(comboBox);
        // fill comboBox

        for (int i = 0; i < lst.size(); i++)
            comboBox.addItem(lst.get(i));

        JLabel label_6 = new JLabel("\u05E9\u05DC\u05D9\u05D8\u05D4 \u05D1\u05E7\u05D5\u05E8\u05E1\u05D9\u05DD");
        label_6.setFont(new Font("Tahoma", Font.PLAIN, 14));
        label_6.setBounds(321, 245, 103, 14);
        frame.getContentPane().add(label_6);

    }
}

    另一种选择是将复选框创建为动作侦听器之外的字段（就像我所做的那样）并使用窗口构建器设置其边界并使用 setVisible(false)。然后在你的监听器上，setVisible(true)

    【讨论】：

    • 嗨。谢谢你帮助我。我正在使用 swing，因为它用于拼贴项目。我做了你写的，但它仍然没有显示复选框。
    • 那么你可能需要给我们更多的代码。还有你在 coursePanel 中使用什么布局？
    • 我编辑了帖子并发送了我的完整代码。 @George Zougianos
    • 您使用的是空布局。这就是组件不显示的原因。您可以在添加组件之前使用 setBounds 到组件，也可以简单地使用布局管理器。我已经在回答中提到了这一点。从不推荐使用 setBounds。
    • 但我无法设置绑定到组合框，因为它来自数据库信息。我不知道我在 coursePanel 中的组合计数是多少
    猜你喜欢
    • 1970-01-01
    • 1970-01-01
    • 1970-01-01
    • 1970-01-01
    • 2018-05-05
    • 1970-01-01
    • 1970-01-01
    • 2021-03-10
    相关资源
    最近更新 更多
    热门标签
    Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode