做一个添加的JPanel父JPanel的内可见(Make an added JPanel visib

如何使添加JPanel父里面可见JPanel ？

我使用NetBeans设计我的UI。

我有一个MainFrame.java ，其中包含两个面板; 即headerPanel和bodyPanel 。

在headerPanel我已经把三个按钮，让它button1 ， button2和button3 。

此外，我已经创建了三个单独的文件扩展JPanel ，将其命名panel1 ， panel2和panel3 。

然后我说里面我所有的三个面板bodypanel在MainFrame.java的构造。

bodyPanel.add(panel1);
bodyPanel.add(panel2);
bodyPanel.add(panel3);

我想上点击相应的按钮，只有相应的面板应该出现在bodypanel大型机，也就是说，如果我按一下button1然后panel1应显示。

我已经尝试下面的代码button1鼠标监听方法：

bodyPanel.validate();
bodyPanel.getComponent(0).setVisible(true);

但panel1不会出现。 我做到了，原因在面板被分配指标添加的组件。 首先，我试图让组件，然后使其可见。 那没起效。

Answer 1:

使用CardLayout ，如图所示这里 。

Answer 2:

您的要求忠实地充分利用卡片布局充满看到这个例子链接

以下例子链接

您的问题的情况下完美的代码

package panels.examples;

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Container;
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;

public class MainFrame extends JFrame implements ActionListener
{
JPanel headerPanel;
JPanel bodyPanel;
JPanel panel1,panel2,panel3;
JButton button1,button2,button3;
Container con;
CardLayout clayout;
public MainFrame() 
{
    //con=getContentPane();
    clayout=new CardLayout();
    headerPanel=new JPanel();
    bodyPanel=new JPanel(clayout);

    button1=new JButton("button1");
    button2=new JButton("button2");
    button3=new JButton("button3");

    //add three buttons to headerPanel
    headerPanel.add(button1);
    headerPanel.add(button2);
    headerPanel.add(button3);

    button1.addActionListener(this);
    button2.addActionListener(this);
    button3.addActionListener(this);

    panel1=new JPanel();
    panel1.add(new JLabel("Panel1"));
    panel1.setBackground(Color.pink);
    panel2=new JPanel();
    panel2.add(new JLabel("Panel2"));
    panel2.setBackground(Color.gray);
    panel3=new JPanel();
    panel3.add(new JLabel("Panel3"));

    //add above three panels to bodyPanel
    bodyPanel.add(panel1,"one");    
    bodyPanel.add(panel2,"two");    
    bodyPanel.add(panel3,"three");  


    setLayout(new BorderLayout());
    setSize(600,450);
    add(headerPanel,BorderLayout.NORTH);
    add(bodyPanel,BorderLayout.CENTER);
//  headerPanel.setBounds(0,0,600,100);
    bodyPanel.setBounds(0,100, 600, 500);
    setVisible(true);

}

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

@Override
public void actionPerformed(ActionEvent e) {

    if(e.getSource()==button1)
    {
        clayout.show(bodyPanel, "one");
    }
    else if(e.getSource()==button2)
    {
        clayout.show(bodyPanel, "two");
    }
    else if(e.getSource()==button3)
    {
        clayout.show(bodyPanel, "three");
    }

}

}

放出来

Answer 3:

使用CardLayout。 下面是我写了一个辅助类。 希望能帮助到你。

import java.awt.CardLayout;

import javax.swing.JPanel;

/**
 * 
 * @author Dchan(Dulitha Wijewantha)
 * 
 *         This class is used to switch Cards in a CardLayout
 * 
 * @version $Revision: 1.0 $
 */
public class CardLayoutHelper {

    private JPanel panel;
    private CardLayout layout;

    /**
     * 

     * @param panel JPanel
     */
    public CardLayoutHelper(JPanel panel) {
        this.panel = panel;
        this.layout = (CardLayout) this.panel.getLayout();
    }
    public CardLayoutHelper(JPanel panel, JPanel... panels){
        this(panel);
        for (int i = 0; i < panels.length; i++) {
            JPanel jPanel = panels[i];
            panel.add(jPanel.getName(), jPanel);
        }
    }

    /**
     * 
     * @param currentPanel
     *            - The panel that will be switched into the view
     */
    public void switchPanel(JPanel currentPanel) {
        panel.removeAll();
        panel.add(currentPanel, currentPanel.getName());
        layout.show(panel, currentPanel.getName());
        panel.revalidate();
        panel.repaint();
    }
    public void switchPanel(String name){
        layout.show(panel, name);
        panel.revalidate();
        panel.repaint();
    }
}

文章来源: Make an added JPanel visible inside a parent JPanel