我无法让它工作:
public void ru() throws InterruptedException {
jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/room.jpg")));
setVisible(true);
Thread.sleep(400);
jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/ROOMS.jpg")));
setVisible(true);
Thread.sleep(400);
jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/background.jpg")));
setVisible(true);
}
private void BtnRoomsMouseEntered(java.awt.event.MouseEvent evt) {
try {
ru();
} catch (InterruptedException ex) {
}
}
有什么解决办法吗?我希望 jLabel 在鼠标进入某个按钮时显示幻灯片,只要鼠标仍在按钮中,就会保持这种状态。如果鼠标碰巧退出按钮,jlabel 将返回到空状态。(没有更多内容。这可能吗?请帮忙。我也尝试使用for
语句,但没有好处。顺便说一下,我正在使用网络豆。
首先你需要实现一个javax.swing.Timer
。尝试调用Thread.sleep()
将阻止事件调度线程。请参阅如何使用摆动计时器。这是基本结构
Timer(int delay, ActionListener listener)
其中delay
是您希望延迟的时间(以毫秒为单位),listener
将侦听每 delay
毫秒触发的Timer
ActionEvent
。
所以你想要这样的东西
public class MyFrame extends javax.swing.JFrame {
private Timer timer = null;
ImageIcon[] icons = new ImageIcon[3];
int index = -1;
public MyFrame() {
initComponents();
icons[0] = new ImageIcon(...);
icons[1] = new ImageIcon(...);
icons[2] = new ImageIcon(...);
timer = new Timer(2000, new ActionListener(){
public void actionPerformed(ActionEvent e) {
if (index + 1 > 2) {
index = 0;
jLabel3.setIcon(icons[index]);
} else {
index++;
jLabel3.setIcon(icons[index]);
}
}
});
}
}
对于您的按钮,您需要使用 mouseEntered
和 mouseExited
,然后您可以调用timer.start()
或timer.stop()
private void jButton1MouseExited(MouseEvent e) {
timer.stop();
}
private void jButton1MouseEntered(MouseEvent e) {
timer.start();
}
如果您不知道如何添加MouseListener
只需右键单击设计视图中的按钮并选择 Event -> Mouse -> mouseEntered
.对mouseExited
做同样的事情。 您应该会看到为您自动生成的上述方法。
更新
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.GroupLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.Timer;
import javax.swing.WindowConstants;
public class ImageViewer extends javax.swing.JFrame {
private Timer timer = null;
ImageIcon[] icons = new ImageIcon[5];
int index = -1;
public ImageViewer() {
initComponents();
try {
icons[0] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/orange/stackoverflow-4-xxl.png"));
icons[1] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/caribbean-blue/stackoverflow-4-xxl.png"));
icons[2] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/royal-blue/stackoverflow-4-xxl.png"));
icons[3] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/moth-green/stackoverflow-4-xxl.png"));
icons[4] = new ImageIcon(new URL("http://www.iconsdb.com/icons/preview/soylent-red/stackoverflow-4-xxl.png"));
} catch (MalformedURLException ex) {
Logger.getLogger(ImageViewer.class.getName()).log(Level.SEVERE, null, ex);
}
timer = new Timer(1000, new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (index + 1 > 4) {
index = 0;
jLabel1.setIcon(icons[index]);
} else {
index++;
jLabel1.setIcon(icons[index]);
}
}
});
}
/**
* 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.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jButton1 = new JButton();
jLabel1 = new JLabel();
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("jButton1");
jButton1.addMouseListener(new MouseAdapter() {
public void mouseEntered(MouseEvent evt) {
jButton1MouseEntered(evt);
}
public void mouseExited(MouseEvent evt) {
jButton1MouseExited(evt);
}
});
GroupLayout layout = new GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1)
.addGap(127, 127, 127))
.addGroup(layout.createSequentialGroup()
.addGap(27, 27, 27)
.addComponent(jLabel1, GroupLayout.PREFERRED_SIZE, 285, GroupLayout.PREFERRED_SIZE)
.addContainerGap(29, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(GroupLayout.Alignment.LEADING)
.addGroup(GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(22, 22, 22)
.addComponent(jLabel1, GroupLayout.DEFAULT_SIZE, 321, Short.MAX_VALUE)
.addGap(18, 18, 18)
.addComponent(jButton1)
.addGap(16, 16, 16))
);
pack();
}// </editor-fold>
private void jButton1MouseEntered(MouseEvent evt) {
timer.start();
}
private void jButton1MouseExited(MouseEvent evt) {
timer.stop();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ImageViewer().setVisible(true);
}
});
}
// Variables declaration - do not modify
private JButton jButton1;
private JLabel jLabel1;
// End of variables declaration
}
您希望向JLabel
添加MouseAdapter
并使用其mouseEntered()
和mouseExited()
,如下所示:
jLabel3.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(java.awt.event.MouseEvent evt) {
try {
jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/room.jpg")));
setVisible(true);
Thread.sleep(400);
jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/ROOMS.jpg")));
setVisible(true);
Thread.sleep(400);
jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/adv/background.jpg")));
setVisible(true);
} catch(InterruptedException e) {
}
@Override
public void mouseExited(java.awt.event.MouseEvent evt) {
//whatever you mean by "null state"
}
});