在JLabel上的过渡是由网格布局中的图像组成的? [英] Rollover on JLabel which consists of image within grid layout?
问题描述
我有一个带有网格布局和两个JLabel图像的代码.每次将鼠标悬停在每张图片上时,我都不会出现一些文字.我对当图像不是JLabel时如何执行此操作很熟悉,但是在整个Web上进行搜索以找到在未命名的JLabel时如何执行此操作.我不希望看到的两张带有单独翻转消息的图像分别是:
I have a code with grid layout and two JLabel images. I wan't some text to appear everytime I roll over each image. I am familiar on how to do this when the image is not a JLabel, but have searched all over the web to find how to do this while it is an unnamed JLabel. The two images I wan't to have, with separate roll over messages are:
ImageIcon(getClass().getResource("giraffe.png"));
Icon windows = new ImageIcon(getClass().getResource("windows.png"));
这是我的代码:
public class giraffe implements ActionListener{
public void actionPerformed(ActionEvent event) {
JOptionPane.showMessageDialog(null,
"Press ok, and see the amazing giraffe outside a window!");
JDialog giraffewindow = new JDialog();
Icon giraffe = new ImageIcon(getClass().getResource("giraffe.png"));
Icon windows = new ImageIcon(getClass().getResource("windows.png"));
giraffewindow.setLayout(new GridLayout(1, 2, 0, 0));
giraffewindow.add(new JLabel (windows));
giraffewindow.add(new JLabel (giraffe));
giraffewindow.pack();
giraffewindow.setTitle("GIRAFFE!");
giraffewindow.setVisible(true);
giraffewindow.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
/*
* I want to have a rollover on EACH IMAGE so that when they rollover the image you see different text.
*/
}
非常感谢您花时间阅读本文,非常感谢您为帮助程序员而付出的努力!
Thank you so much for the time you are taking for reading this, I really appreciate the effort you are putting into helping a fellow programmer!
推荐答案
首先查看如何编写鼠标侦听器.
基本上,您希望将MouseListener
附加到每个标签并监视mouseEntered
和mouseExited
事件,并根据需要更新标签状态
Basically, you want to attach a MouseListener
to each label and monitor the mouseEntered
and mouseExited
events, updating the label state as per your requirements
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
try {
JLabel left = new JLabel(new ImageIcon(ImageIO.read(...))));
left.setVerticalTextPosition(JLabel.BOTTOM);
left.setHorizontalTextPosition(JLabel.CENTER);
left.setHorizontalAlignment(JLabel.CENTER);
left.setVerticalAlignment(JLabel.CENTER);
left.setText(" ");
JLabel right = new JLabel(new ImageIcon(ImageIO.read(...))));
right.setVerticalTextPosition(JLabel.BOTTOM);
right.setHorizontalTextPosition(JLabel.CENTER);
right.setHorizontalAlignment(JLabel.CENTER);
right.setVerticalAlignment(JLabel.CENTER);
right.setText(" ");
setLayout(new GridLayout(1, 2));
add(left);
add(right);
left.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent e) {
left.setText("I'm on the left");
}
@Override
public void mouseExited(MouseEvent e) {
left.setText(" ");
}
});
right.addMouseListener(new MouseAdapter() {
@Override
public void mouseEntered(MouseEvent e) {
right.setText("I'm on the right");
}
@Override
public void mouseExited(MouseEvent e) {
right.setText(" ");
}
});
} catch (IOException exp) {
exp.printStackTrace();
}
}
}
}
您可能还想看看阅读/加载图片
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