• Java自学-图形界面 面板


    Swing 四种常见面板

    示例 1 : 基本面板

    JPanel即为基本面板
    面板和JFrame一样都是容器,不过面板一般用来充当中间容器,把组件放在面板上,然后再把面板放在窗体上。
    一旦移动一个面板,其上面的组件,就会全部统一跟着移动,采用这种方式,便于进行整体界面的设计

    基本面板

    package gui;
     
    import java.awt.Color;
    import java.awt.FlowLayout;
     
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
     
    public class TestGUI {
        public static void main(String[] args) {
     
            JFrame f = new JFrame("LoL");
            f.setSize(400, 300);
            f.setLocation(200, 200);
     
            f.setLayout(null);
     
            JPanel p1 = new JPanel();
            // 设置面板大小
            p1.setBounds(50, 50, 300, 60);
            // 设置面板背景颜色
            p1.setBackground(Color.RED);
     
            // 这一句可以没有,因为JPanel默认就是采用的FlowLayout
            p1.setLayout(new FlowLayout());
     
            JButton b1 = new JButton("英雄1");
            JButton b2 = new JButton("英雄2");
            JButton b3 = new JButton("英雄3");
     
            // 把按钮加入面板
            p1.add(b1);
            p1.add(b2);
            p1.add(b3);
     
            JPanel p2 = new JPanel();
            JButton b4 = new JButton("英雄4");
            JButton b5 = new JButton("英雄5");
            JButton b6 = new JButton("英雄6");
     
            p2.add(b4);
            p2.add(b5);
            p2.add(b6);
     
            p2.setBackground(Color.BLUE);
            p2.setBounds(10, 150, 300, 60);
     
            // 把面板加入窗口
            f.add(p1);
            f.add(p2);
     
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
            f.setVisible(true);
        }
    }
    

    示例 2 : ContentPane

    JFrame上有一层面板,叫做ContentPane
    平时通过f.add()向JFrame增加组件,其实是向JFrame上的 ContentPane加东西

    package gui;
     
    import javax.swing.JButton;
    import javax.swing.JFrame;
     
    public class TestGUI {
        public static void main(String[] args) {
     
            JFrame f = new JFrame("LoL");
            f.setSize(400, 300);
            f.setLocation(200, 200);
            f.setLayout(null);
            JButton b = new JButton("一键秒对方基地挂");
            b.setBounds(50, 50, 280, 30);
     
            f.add(b);
            // JFrame上有一层面板,叫做ContentPane
            // 平时通过f.add()向JFrame增加组件,其实是向JFrame上的 ContentPane加东西
            // f.add等同于f.getContentPane().add(b);
            f.getContentPane().add(b);
     
            // b.getParent()获取按钮b所处于的容器
            // 打印出来可以看到,实际上是ContentPane而非JFrame
            System.out.println(b.getParent());
     
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
            f.setVisible(true);
        }
    }
    

    示例 3 : SplitPanel

    创建一个水平JSplitPane,左边是pLeft,右边是pRight

    SplitPanel

    package gui;
      
    import java.awt.Color;
    import java.awt.FlowLayout;
      
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JSplitPane;
      
    public class TestGUI {
        public static void main(String[] args) {
      
            JFrame f = new JFrame("LoL");
            f.setSize(400, 300);
            f.setLocation(200, 200);
      
            f.setLayout(null);
      
            JPanel pLeft = new JPanel();
            pLeft.setBounds(50, 50, 300, 60);
      
            pLeft.setBackground(Color.RED);
      
            pLeft.setLayout(new FlowLayout());
      
            JButton b1 = new JButton("盖伦");
            JButton b2 = new JButton("提莫");
            JButton b3 = new JButton("安妮");
      
            pLeft.add(b1);
            pLeft.add(b2);
            pLeft.add(b3);
      
            JPanel pRight = new JPanel();
            JButton b4 = new JButton("英雄4");
            JButton b5 = new JButton("英雄5");
            JButton b6 = new JButton("英雄6");
      
            pRight.add(b4);
            pRight.add(b5);
            pRight.add(b6);
      
            pRight.setBackground(Color.BLUE);
            pRight.setBounds(10, 150, 300, 60);
      
            // 创建一个水平JSplitPane,左边是p1,右边是p2
            JSplitPane sp = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, pLeft, pRight);
            // 设置分割条的位置
            sp.setDividerLocation(80);
      
            // 把sp当作ContentPane
            f.setContentPane(sp);
      
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      
            f.setVisible(true);
        }
    }
    

    示例 4 : JScrollPanel

    使用带滚动条的面板有两种方式

    1. 在创建JScrollPane,把组件作为参数传进去
      JScrollPane sp = new JScrollPane(ta);

    2. 希望带滚动条的面板显示其他组件的时候,调用setViewportView
      sp.setViewportView(ta);

    JScrollPanel

    package gui;
     
    import javax.swing.JFrame;
    import javax.swing.JScrollPane;
    import javax.swing.JTextArea;
     
    public class TestGUI {
        public static void main(String[] args) {
     
            JFrame f = new JFrame("LoL");
            f.setSize(400, 300);
            f.setLocation(200, 200);
     
            f.setLayout(null);
            //准备一个文本域,在里面放很多数据
            JTextArea ta = new JTextArea();
            for (int i = 0; i < 1000; i++) {
                ta.append(String.valueOf(i));
            }
            //自动换行
            ta.setLineWrap(true);
            JScrollPane sp = new JScrollPane(ta);
     
            f.setContentPane(sp);
     
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
            f.setVisible(true);
        }
    }
    

    示例 5 : TabbedPanel

    TabbedPanel

    package gui;
      
    import java.awt.Color;
    import java.awt.FlowLayout;
     
    import javax.swing.ImageIcon;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JTabbedPane;
      
    public class TestGUI {
        public static void main(String[] args) {
      
            JFrame f = new JFrame("LoL");
            f.setSize(400, 300);
            f.setLocation(200, 200);
      
            f.setLayout(null);
      
            JPanel p1 = new JPanel();
            p1.setBounds(50, 50, 300, 60);
      
            p1.setBackground(Color.RED);
      
            p1.setLayout(new FlowLayout());
      
            JButton b1 = new JButton("英雄1");
            JButton b2 = new JButton("英雄2");
            JButton b3 = new JButton("英雄3");
      
            p1.add(b1);
            p1.add(b2);
            p1.add(b3);
      
            JPanel p2 = new JPanel();
            JButton b4 = new JButton("英雄4");
            JButton b5 = new JButton("英雄5");
            JButton b6 = new JButton("英雄6");
      
            p2.add(b4);
            p2.add(b5);
            p2.add(b6);
      
            p2.setBackground(Color.BLUE);
            p2.setBounds(10, 150, 300, 60);
      
            JTabbedPane tp = new JTabbedPane();
            tp.add(p1);
            tp.add(p2);
      
            // 设置tab的标题
            tp.setTitleAt(0, "红色tab");
            tp.setTitleAt(1, "蓝色tab");
             
            ImageIcon i = new ImageIcon("e:/project/j2se/j.png");
            tp.setIconAt(0,i );
            tp.setIconAt(1,i );
      
            f.setContentPane(tp);
      
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      
            f.setVisible(true);
        }
    }
    

    示例 6 : CardLayerout

    CardLayerout 布局器 很像TabbedPanel ,在本例里面上面是一个下拉框,下面是一个CardLayerout 的JPanel
    这个JPanel里有两个面板,可以通过CardLayerout方便的切换

    CardLayerout

    package gui;
     
    import java.awt.BorderLayout;
    import java.awt.CardLayout;
    import java.awt.event.ItemEvent;
    import java.awt.event.ItemListener;
     
    import javax.swing.JButton;
    import javax.swing.JComboBox;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JTextField;
     
    public class TestGUI {
     
        public static void main(String[] args) {
            JFrame f = new JFrame("CardLayerout");
     
            JPanel comboBoxPane = new JPanel();
            String buttonPanel = "按钮面板";
            String inputPanel = "输入框面板";
            String comboBoxItems[] = { buttonPanel, inputPanel };
            JComboBox<String> cb = new JComboBox<>(comboBoxItems);
            comboBoxPane.add(cb);
     
            // 两个Panel充当卡片
            JPanel card1 = new JPanel();
            card1.add(new JButton("按钮 1"));
            card1.add(new JButton("按钮 2"));
            card1.add(new JButton("按钮 3"));
     
            JPanel card2 = new JPanel();
            card2.add(new JTextField("输入框", 20));
     
            JPanel cards; // a panel that uses CardLayout
            cards = new JPanel(new CardLayout());
            cards.add(card1, buttonPanel);
            cards.add(card2, inputPanel);
     
            f.add(comboBoxPane, BorderLayout.NORTH);
            f.add(cards, BorderLayout.CENTER);
     
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            f.setSize(250, 150);
            f.setLocationRelativeTo(null);
            f.setVisible(true);
     
            cb.addItemListener(new ItemListener() {
     
                @Override
                public void itemStateChanged(ItemEvent evt) {
                    CardLayout cl = (CardLayout) (cards.getLayout());
                    cl.show(cards, (String) evt.getItem());
                }
            });    
        }
             
    }
    

    更多内容,点击了解: Swing 四种常见面板

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  • 原文地址:https://www.cnblogs.com/jeddzd/p/13492775.html
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