将JPanel设为透明?!

hoofi 2001-10-23 06:07:21

请问各位高手:在一个设置了背景图片的容器中加一个JPanel,希望新增的JPanel某些部分不覆盖其容器的背景图片,不知道该怎么实现?我费了好大功夫都没有实现,实在怪小弟新手入门,烦请指教.

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qqf 2002-06-19

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JPanel.setOpaque(false);

CanFly 2001-10-24

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public void setOpaque(boolean isOpaque)

If true the components background will be filled with the background color. Otherwise, the background is transparent, and whatever is underneath will show through.

The default value of this property is false.

This is a JavaBeans bound property.

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NP_Complete 2001-10-24

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setOpaque(false)啊.

czb 2001-10-23

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setOpaque()行吗？

在本文中我们给大家整理了关于Java透明窗体的设置方法以及需要注意的地方，需要的朋友们学习参考下。

如何设置JFrame的背景，需要注意的，设置Jpanel为透明

mport java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; public class test { ImageIcon imageIcon =new ImageIcon("透明旋转枫.gif");//images这个文件 ImageIcon imagebutton=new ImageIcon("button.png"); JLabel j2=new JLabel(); public test(){ final JFrame f= new JFrame(); f.setBounds(0,00,400,300); f.setDefaultCloseOperation(3); f.setUndecorated(true); com.sun.awt.AWTUtilities.setWindowOpaque(f,false);//设置窗体透明 JPanel p=new JPanel(){ public void paintComponent(Graphics g){//重写paintComponent super.paintComponent(g);//继承的绘制组件方法 Graphics2D gg=(Graphics2D)g; if(imageIcon !=null){//绘制背景 gg.drawImage(imageIcon.getImage(),0,0,f.getWidth(),f.getHeight(),f); } } }; p.setLayout(null);//空布局任意摆放与下面的b1.setBounds(280,80,60,25);呼应 JButton b1=new JButton("exit",imagebutton); b1.addActionListener(new ActionListener(){ public void actionPerformed (ActionEvent e){ System.exit(0); } });

class ZiMupanel extends JFrame { public ZiMupanel() { Container con = this.getContentPane(); // 设置窗口名称 this.setTitle("滚动字幕"); // 设置布局管理器为 null ，方便面板定位，一般使用null 布局时，将窗口设置不可改变大小 this.setLayout(null); // 设置窗口位置和大小 this.setBounds(300, 300, 460, 330); // 设置窗口可见 this.setVisible(true); // 设置不可改变大小 this.setResizable(false); // 设置当点击窗口的关闭按钮时退出 // 设置此窗体关闭，滚动面板不关闭 this.setDefaultCloseOperation(DISPOSE_ON_CLOSE); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Panelfont1 p1 = new Panelfont1(); con.add(p1); p1.setBounds(15, 15, 175, 60); Panelfont2 p2 = new Panelfont2(); con.add(p2); p2.setBounds(195, 15, 250, 60); Panelneizi p3 = new Panelneizi(); con.add(p3); p3.setBounds(15, 80, 175, 80); Paneldirection p4 = new Paneldirection(); con.add(p4); p4.setBounds(195, 80, 250, 80); Panel5 p5 = new Panel5(); con.add(p5); p5.setBounds(15, 155, 430, 70); Panel6 p6 = new Panel6(); con.add(p6); p6.setBounds(15, 220, 430, 70); } } class Panelfont1 extends JPanel implements ActionListener{ public Panelfont1() { this.setBorder(BorderFactory.createTitledBorder("滚动字幕的文字大小控制"));//设置面板边框 this.setLayout(new GridLayout(1, 2)); bigfont = new JRadioButton("大字体", false); smallfont = new JRadioButton("小字体", true); bigfont.addActionListener(this); smallfont.addActionListener(this); ButtonGroup sexRadioButtonGroup = new ButtonGroup();// 创建一个选按钮组 sexRadioButtonGroup.add(bigfont);// 将单选按钮对象添加到按钮组中 sexRadioButtonGroup.add(smallfont);// 将单选按钮对象添加到按钮组中 //Enumeration elements = sexRadioButtonGroup.getElements();// 遍历按钮组中的所有按钮 this.add(bigfont); this.add(smallfont); } public void actionPerformed(ActionEvent e) { if(bigfont.isSelected()){ fontSize = 50; }else { fontSize = 36; } Font font = new Font(fontName,Font.BOLD,fontSize);

package com.Login; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.Point; import java.awt.Rectangle; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import javax.swing.BorderFactory; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.UIManager; import com.jdbc.DB; import com.window.Main; public class Login extends JFrame { private JPanel contentPane; private Point pressedPoint; /*private final class LoginActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { // 显示窗体的登录进度面板 getGlassPane().setVisible(true); } }*/ public static void main(String[] args) { try { UIManager .setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"); } catch (Throwable e) { e.printStackTrace(); } EventQueue.invokeLater(new Runnable() { public void run() { try { Login frame = new Login (); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } public Login(){ super("登录"); addWindowListener(new WindowAdapter() { @Override public void windowOpened(WindowEvent e) { do_this_windowOpened(e); } }); setUndecorated(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(380,280); setIconImage(new ImageIcon("image\\tubiao.png").getImage()); Dimension displaySize = Toolkit.getDefaultToolkit().getScreenSize(); Dimension frameSize=this.getSize(); setLocation((displaySize.width - frameSize.width) / 2+(frameSize.width)/2,(displaySize.height - frameSize.height) / 2); contentPane=new JPanel(); contentPane.setBorder(BorderFactory.createLineBorder(Color.BLACK)); //设置边框为无 contentPane.setLayout(new BorderLayout(0,0));//设置contentPane的布局 setContentPane(contentPane);// JPanel topPanel = new JPanel(){ public void paintComponent(Graphics g) { g.drawImage(new ImageIcon("image\\logintop1.jpg").getImage(), 0, 0,500,48, null); super.paintComponent(g); } };//标题栏panel topPanel.addMouseMotionListener(new MouseMotionAdapter() { @Override public void mouseDragged(MouseEvent e) { do_topPanel_mouseDragged(e); } }); topPanel.addMouseListener(new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { do_topPanel_mousePressed(e); } }); topPanel.setOpaque(false);//设置背景透明 topPanel.setPreferredSize(new Dimension(500,30)); topPanel.setLayout(null); JPanel panel = new JPanel(); panel.setBounds(312, 0, 66, 15); panel.setOpaque(false); topPanel.add(panel); panel.setLayout(new GridLayout(1, 0, 0, 0)); JButton button = new JButton(""); button.setRolloverIcon(new ImageIcon("image\\button4.png")); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { do_button_itemStateChanged(e); } }); button.setFocusPainted(false);// 取消焦点绘制 button.setBorderPainted(false);// 取消边框绘制 button.setContentAreaFilled(false);// 取消内容绘制 button.setIcon(new ImageIcon("image\\button4-1.png")); panel.add(button); JButton button_2 = new JButton(""); button_2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { do_button_2_actionPerformed(e); } }); button_2.setRolloverIcon(new ImageIcon("image\\button3.png")); button_2.setFocusPainted(false); button_2.setContentAreaFilled(false); button_2.setBorderPainted(false); button_2.setIcon(new ImageIcon("image\\button3-1.png")); panel.add(button_2); contentPane.add(topPanel, BorderLayout.NORTH); JPanel backgroundPanel = new JPanel(){ public void paintComponent(Graphics g) { g.drawImage(new ImageIcon("image\\loginframe1.jpg").getImage(), 0, 0,500,300, null); super.paintComponent(g); } };//panel backgroundPanel.setLayout(new GridLayout(1,1)); backgroundPanel.setOpaque(false); JPanel panel1 = new JPanel() { public void paintComponent(Graphics g) { g.drawImage(new ImageIcon("image\\4.png").getImage(), 0, 0,420,200, null); super.paintComponent(g); } }; panel1.setLayout(null); panel1.setOpaque(false); JLabel label1=new JLabel("用户名："); JLabel label2=new JLabel("密码："); final JTextField text1=new JTextField(15); final JPasswordField text2=new JPasswordField(15); label1.setBounds(80,60,60,30); text1.setBounds(160, 60, 150,30); label2.setBounds(80,120,60,30); text2.setBounds( 160, 120, 150, 30); panel1.add(label1); panel1.add(text1); panel1.add(label2); panel1.add(text2); backgroundPanel.add(panel1); contentPane.add(backgroundPanel, BorderLayout.CENTER); JPanel panel2 =new JPanel(); //panel2.setPreferredSize(new Dimension(380,40)); panel2.setLayout(null); panel2.setOpaque(false); JButton button1=new JButton("登录"); JButton button2=new JButton("取消"); MouseAdapter mouseAdapter = new MouseAdapter() {// 创建鼠标事件监听器 private Rectangle sourceRec;// 创建矩形对象 @Override public void mouseEntered(MouseEvent e) { JButton button = (JButton) e.getSource();// 获取事件源按钮 sourceRec = button.getBounds();// 保存按钮大小 button.setBounds(sourceRec.x-5, sourceRec.y-5, sourceRec.width + 10, sourceRec.height + 10);// 把按钮放大 super.mouseEntered(e); } @Override public void mouseExited(MouseEvent e) { JButton button = (JButton) e.getSource();// 获取事件源按钮 if (sourceRec != null) {// 如果有备份矩形则用它恢复按钮大小 button.setBounds(sourceRec);// 设置按钮大小 } super.mouseExited(e); } }; button1.addMouseListener(mouseAdapter); button2.addMouseListener(mouseAdapter); button1.setBackground(new Color(154,216,230)); button2.setBackground(new Color(154,216,230)); //button1.setBorder(BorderFactory.createLineBorder(Color.blue) ); //button1.setBorder(new EmptyBorder(10, 0, 0, 0));// 顶部留白：40pix //button2.setBorder(new EmptyBorder(10, 0, 0, 0));// 顶部留白：40pix button1.setBounds(190, 9,70, 30); button2.setBounds(280, 9,70, 30); panel2.add(button1); panel2.add(button2); panel2.setBounds(0, 200, 380, 50); panel1.add(panel2); //button1.addActionListener( new LoginActionListener()); button1.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { Connection con = null; PreparedStatement pstmt = null; ResultSet rs=null; Statement stmt=null; try{ con=DB.getConnection(); pstmt = con.prepareStatement("select *from tb_manager where id=? and password=?"); pstmt.setString(1, text1.getText()); pstmt.setString(2, text2.getText()); rs=pstmt.executeQuery(); JOptionPane pane=new JOptionPane(); if(rs.next()) { // new LoginActionListener(); pane.showMessageDialog(null, "登录成功！"); // new Main(); new Main(); dispose();// 销毁窗体 con.close(); } else if(text1.getText().equals("")||text2.getText().equals("")) { pane.showMessageDialog(null, " 登录失败！用户名或密码不能为空，请重新输入！"); text1.setText(""); text2.setText(""); } else { pane.showMessageDialog(null, "登录失败，你输入的用户名或密码错误,请重新输入！"); text1.setText(""); text2.setText(""); } }catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { DB.close(pstmt); DB.close(pstmt); } } } ); button2.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent event) { System.exit(0); } } ); } protected void do_button_itemStateChanged(ActionEvent e) { setExtendedState(JFrame.ICONIFIED);// 窗体最小化 } protected void do_button_2_actionPerformed(ActionEvent e) { dispose();// 销毁窗体 } protected void do_topPanel_mousePressed(MouseEvent e) { pressedPoint = e.getPoint();// 记录鼠标坐标 } protected void do_topPanel_mouseDragged(MouseEvent e) { Point point = e.getPoint();// 获取当前坐标 Point locationPoint = getLocation();// 获取窗体坐标 int x = locationPoint.x + point.x - pressedPoint.x;// 计算移动后的新坐标 int y = locationPoint.y + point.y - pressedPoint.y; setLocation(x, y);// 改变窗体位置 } protected void do_this_windowOpened(WindowEvent e) { final int height = getHeight();// 记录窗体高度 new Thread() {// 创建新线程 public void run() { Rectangle rec = getBounds(); for (int i = 0; i < 385; i += 10) {// 循环拉伸窗体 setBounds(rec.x - i / 2, rec.y, i, height);// 不断设置窗体大小与位置 try { Thread.sleep(15);// 线程休眠10毫秒 } catch (InterruptedException e1) { e1.printStackTrace(); } } } }.start();// 启动线程 } }

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