改变所有tabbedpane面板颜色的按钮动作java swing

Question

我在选项卡窗格中有 2 个选项卡（A 和 B）。 在A中，我只写了setBackground(Color.RED);

在 B 中，我放了一个 Button。并且代码是这样的：

A a=new A();

jButton1.addActionListener(new ActionListener() {
  @Override
  public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub
    a.setBackground(Color.BLUE);
    }
});

我想通过 B 的按钮动作改变 A 的颜色。但我失败了。 我该如何解决这个问题？？

提前谢谢...

---

我的问题仍然没有解决。我发布了整个代码:: 我使用了 2 个包：“ok”、“ok1”。 "ok" 包含 1 个名为 save.java 的文件，代码为：

public class Save extends javax.swing.JFrame {
private JPanel panel1;
private JPanel panel2;A a=new A();B b=new B();



public Save() {
    initComponents();
}

//GEN-BEGIN:initComponents
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
    panel1=a.initComponents();
    panel2=b.initComponents();
    jTabbedPane1 = new javax.swing.JTabbedPane();
    jScrollPane1 = new javax.swing.JScrollPane();
    jScrollPane2 = new javax.swing.JScrollPane();
            setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    jTabbedPane1.addTab("Tab 1", null, panel1, "Just Panel");
    jTabbedPane1.setMnemonicAt(0, KeyEvent.VK_1);

    jTabbedPane1.addTab("Tab 2", null, panel2, "Button");
            jTabbedPane1.setMnemonicAt(1, KeyEvent.VK_2);

---

“ok1”包含2个文件：A.java和B.java..... A.java:::::::::

             public class A extends javax.swing.JPanel {

/** Creates new form A */
public A() {
    initComponents();

}

/** This method is called from within the constructor to
 * initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is
 * always regenerated by the Form Editor.
 */
//GEN-BEGIN:initComponents
// <editor-fold defaultstate="collapsed" desc="Generated Code">
public JPanel initComponents() {

    jPanel11 = new javax.swing.JPanel();

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(
            jPanel11);
            jPanel11.setLayout(jPanel1Layout);

---

B.java::::::::

             public class B extends javax.swing.JPanel {
A a = new A();

/** Creates new form B */
public  B() {
    initComponents();


}

/** This method is called from within the constructor to
 * initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is
 * always regenerated by the Form Editor.
 */
//GEN-BEGIN:initComponents
// <editor-fold defaultstate="collapsed" desc="Generated Code">
public JPanel initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jButton1 = new javax.swing.JButton();

    jButton1.setText("Action");
    jButton1.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            // TODO Auto-generated method stub
            a.jPanel11.setBackground(Color.RED);
        }
    });

Answer 1

参考TabColors，它以匹配选项卡和内容颜色开始，以下修改后的TabContent 构造函数添加了一个按钮，使所有窗格使用相同的颜色。

private TabContent(final int i, Color color) {
    setOpaque(true);
    setBackground(color);
    add(new JLabel("Tab content " + String.valueOf(i)));
    add(new JButton(new AbstractAction("Use my color") {

        @Override
        public void actionPerformed(ActionEvent e) {
            for (int j = 0; j < pane.getTabCount(); j++) {
                pane.getComponentAt(j).setBackground(
                    pane.getBackgroundAt(i));
            }
        }
    }));
}

Answer 2

查看您的代码，您似乎做错了。首先不要写这几行

private JPanel panel1;
private JPanel panel2;

改为写：

private A a = new A();
private B b = new B(a);

从 a 和 b 开始，它们本身就是面板，因为它们扩展了 JPanel 类。

所以现在将它添加到您的 tabbedPane 中：

jTabbedPane1.addTab("Tab 1", null, a/*This is your Panel1*/, "Just Panel");
jTabbedPane1.addTab("Tab 2", null, b/*This is your Panel2*/, "Button");

只需将 JPanel 变量添加到您的 B 类并更改您的 B 类的构造函数，如下所示：

JPanel panel1;

public B(JPanel panel)
{
    pane1 = panel;
    initComponents(); // make this method return void in it's definition, in both the classes.
}

现在在 actionPerformed() 方法中执行以下操作：

jButton1.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            // TODO Auto-generated method stub
            panel1.setBackground(Color.RED);
        }
    });

这是从之前提交的修改的小程序，类似于你的情况：

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class TabbedPaneExample extends JPanel
{
    private Panel1 panel1;
    private Panel2 panel2;

    public TabbedPaneExample()
    {
        super(new GridLayout(1, 1));

        JTabbedPane tabbedPane = new JTabbedPane();

        //panel1 = getPanel("Panel Number 1");  
        panel1 = new Panel1("Panel Number 1");
        tabbedPane.addTab("Tab 1", null, panel1, "Just Panel");
        tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);

        //panel2 = getPanelWithButton("COLOR");
        panel2 = new Panel2("COLOR", panel1);
        tabbedPane.addTab("Tab 2", null, panel2, "Button");
        tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);

        add(tabbedPane);

        tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
    }

    private static void createAndDisplayGUI()
    {
        JFrame frame = new JFrame("Tabbed Pane Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(new TabbedPaneExample(), BorderLayout.CENTER);

        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
            {
                public void run()
                {
                    createAndDisplayGUI();
                }
            });
    }
}

class Panel1 extends JPanel
{
    public JLabel label;
    public Panel1(String text)
    {       
        label = new JLabel(text);
        label.setHorizontalAlignment(JLabel.CENTER);
        setLayout(new GridLayout(1, 1));
        setBackground(Color.RED);
        add(label);
    }
}

class Panel2 extends JPanel
{
    public JButton button;
    public JPanel panel1;

    public Panel2(String text, JPanel panel)
    {
            panel1 = panel;
        button = new JButton(text);
        button.addActionListener(new ActionListener()
            {
                public void actionPerformed(ActionEvent ae)
                {
                    panel1.setBackground(Color.BLUE);
                }
            });
        setLayout(new GridLayout(1, 1));
        add(button);
    }
}

希望这能帮助你解释你做错了什么。

这是程序启动时的图像：

这是带有按钮的第二个标签的图像：

这是第一个选项卡的图像，当您单击 tab2 的按钮以将 tab1 的背景颜色更改为蓝色时：

希望这对您的努力有所帮助。

问候

Answer 3

您不应创建A 的新实例，而应使用选项卡式窗格中包含的A 实例。您可以通过在选项卡式窗格中搜索此A 实例来实现这一点，或者在创建B 时将A 实例传递给B