Question

我开发了一个模板GUI，我想重复使用，为此我添加了一个在模板中为空的面板，我想动态地加载它。所以假设下面的代码：

public class TempGUI extends JFrame{

      public TempGUI(JPanel DynamicPanel){
         InitComponents();
         this.DynamicPanel = DynamicPanel;
      }
 ...
}

这似乎不起作用，因为面板没有改变。我认为这应该是正常的，那么有没有办法获取动态面板的组件和表单中的SET THEM？

Answer 1

所有this.DynamicPanel = DynamicPanel;都是实例字段，this.DynamicPanel现在指向参数DynamicPanel。如果参数不在屏幕上，那么你将看不到任何东西。事实上，这不会影响this.DynamicPanel指向的内容。

相反，请考虑将参数实际添加到容器中......

public class TempGUI extends JFrame{

      public TempGUI(JPanel DynamicPanel){
         InitComponents();
         this.DynamicPanel.add(DynamicPanel);
      }
 ...
}

但是你需要稍微改变一下，所以你会DynamicPanelContent（它会取代this.DynamicPanel），这样你就可以继续引用this.DynamicPanel了会指出你传递给构造函数的东西......

public class TempGUI extends JFrame{

      private JPanel dynamicPanel;

      public TempGUI(JPanel dynamicPanel){
         initComponents();
         this.dynamicPanel = dynamicPanel;
         this.dynamicPanelContent.add(this.dynamicPanel);
      }
 ...
}

或者其他一些......

更新了示例

你尝试过吗？并且没有理由在此定义私有字段。它不起作用。

似乎对我工作正常......

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JPanel myView = new JPanel(new GridBagLayout());
                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridx = 0;
                gbc.gridy = 0;
                JLabel label = new JLabel("Hello!");
                myView.add(label, gbc);
                JButton btn = new JButton("Say good-bye");
                btn.addActionListener(new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        label.setText("Good bye");
                    }
                });
                gbc.gridy++;
                myView.add(btn, gbc);

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane(myView));
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane<V extends JPanel> extends JPanel {

        private V view;

        public TestPane(V view) {
            setLayout(new BorderLayout());
            this.view = view;
            JPanel viewContent = new JPanel(new BorderLayout());
            viewContent.setBorder(new EmptyBorder(10, 10, 10, 10));
            viewContent.add(view);

            add(viewContent);
        }

        public V getView() {
            return view;
        }

    }

}

动态加载面板内容

1 个答案: