java - 在 Java Swing 中动态添加 JPanel 到另一个 JPanel

Question

我对 java swing 很陌生，java 也是如此。我使用netbeans 的window 构建器来设计GUI。我有一个名为 orderListPanel 的 JPanel，其中包含一个名为 orderListRowPanel 的 JPanel。现在，我得到了 JPanel 列表，我想将这些 JPanel 插入到 orderListPanel 中。

http://postimage.org/image/ex00whf69/
orderListPanel 位于中间，orderListRowPanel 与 orderListPanel 位于同一位置

http://postimage.org/image/dbrtn33sj/
现在我想将许多 JPanel 插入 orderListPanel 并使其看起来像一个列表。红色方 block 是 JPanel 侧面的组件。

我尝试使用 BorderLayout，当我使用foreach 循环 orderListPanel.add(List pList)，我在 orderListPanel 中看不到任何结果。有谁知道怎么解决吗？

Answer 1

不要使用 Netbeans 自动化 GUI 构建器。拖放 GUI 构建技术在 Java 社区中是 Not Acceptable 。您尚未提供代码，因此我们无法进行代码编辑。您的图像不可用。

但是，您可以这样做。这是纯手工代码

import java.awt.*;
import java.util.ArrayList;
import javax.swing.*;
import java.util.List;

public class GUIBuilder extends JFrame
{
    private JPanel orderList;
    private JPanel orderListRow;
    private JPanel additionalPanel;

    private List panels = new ArrayList(); //Your List

    private JLabel label1, label2, label3;

    public GUIBuilder()
    {
        label1 = new JLabel("Label 1"); //Create the JLabels
        label2 = new JLabel("Label 2");//Create the JLabels
        label3 = new JLabel("Label 3");//Create the JLabels


        orderList = new JPanel(); //Creating the orderList JPanel
       orderList.setLayout(new BoxLayout(orderList, BoxLayout.Y_AXIS)); //Setting Box layout, and set the direction to Y axis.


        orderListRow = new JPanel(); //Creating the orderListRow JPanel        
        orderListRow.add(label1);

        additionalPanel = new JPanel(); //Creating the additionalPanel JPanel      
        additionalPanel.add(label2);

        orderList.add(orderListRow); //Adding orderListRow into orderList
        orderList.add(additionalPanel); //Adding additionalPanel into orderList

        this.setLayout(new GridLayout(1,1));
        this.add(orderList); //Setting orderList into JFrame

        this.pack(); //Setting JFrame size. This will only take required space
        this.setVisible(true); //Making JFrame Visible
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //When you hit the 'X' button, the program will exit
    }

    public static void main(String[]args)
    {
        try
        {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); //Setting the UI into your native platform UI
            new GUIBuilder(); //Calling your program
        }
        catch(Exception e)
        {
            e.printStackTrace(); //If any error occured in setting up UI, print the stack trace
        }
    }
}

如果您将面板放在列表中，则使用它

import java.awt.*;
import java.util.ArrayList;
import javax.swing.*;
import java.util.List;

public class GUIBuilder extends JFrame
{
    private JPanel orderList;
    private JPanel orderListRow;
    private JPanel additionalPanel;

    private List<JPanel> panels = new ArrayList<JPanel>(); //Your List

    private JLabel label1, label2, label3;

    public GUIBuilder()
    {
        label1 = new JLabel("Label 1"); //Create the JLabels
        label2 = new JLabel("Label 2");//Create the JLabels
        label3 = new JLabel("Label 3");//Create the JLabels


        orderList = new JPanel(); //Creating the orderList JPanel
        orderList.setLayout(new BoxLayout(orderList, BoxLayout.Y_AXIS)); //Setting Box layout, and set the direction to Y axis.


        orderListRow = new JPanel(); //Creating the orderListRow JPanel        
        orderListRow.add(label1);
        panels.add(orderListRow); // Add the panel to the List

        additionalPanel = new JPanel(); //Creating the additionalPanel JPanel      
        additionalPanel.add(label2);
        panels.add(additionalPanel); // Add the panel to the List


        for(int i=0;i<panels.size();i++)
        {
            orderList.add(panels.get(i));
        }



        this.setLayout(new GridLayout(1,1));
        this.add(orderList); //Setting orderList into JFrame

        this.pack(); //Setting JFrame size. This will only take required space
        this.setVisible(true); //Making JFrame Visible
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //When you hit the 'X' button, the program will exit
    }

    public static void main(String[]args)
    {
        try
        {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); //Setting the UI into your native platform UI
            new GUIBuilder(); //Calling your program
        }
        catch(Exception e)
        {
            e.printStackTrace(); //If any error occured in setting up UI, print the stack trace
        }
    }
}