Question

java se jlabel边框问题

我给jlabel的鼠标进入事件设置了一个borderfactry.creatloweredbevelborder,我想在鼠标出来时设成默认的边框

Answer 1

你看一下，下边的代子可以不？

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import java.awt.Color;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.Border;

public class JLabelDemo extends JFrame implements MouseListener {
private JLabel lblNewLabel = null;

public JLabelDemo() {
getContentPane().setLayout(null);

lblNewLabel = new JLabel("New label");
lblNewLabel.setBounds(80, 80, 166, 86);
lblNewLabel.setBorder(BorderFactory.createLineBorder(Color.RED));
lblNewLabel.addMouseListener(this);
getContentPane().add(lblNewLabel);

setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setSize(400, 380);
setResizable(false);
setVisible(true);
}

public static void main(String[] args) {
new JLabelDemo();
}

public void mouseClicked(MouseEvent e) {

}

public void mouseEntered(MouseEvent e) {
Border border = BorderFactory.createLineBorder(Color.BLUE);
lblNewLabel
.setBorder(BorderFactory.createTitledBorder(border, "hello"));
}

public void mouseExited(MouseEvent e) {
lblNewLabel.setBorder(BorderFactory.createLineBorder(Color.RED));
}

public void mousePressed(MouseEvent e) {

}

public void mouseReleased(MouseEvent e) {

}
}

Answer 2

你在设置border的之前，先用个Border把jlabel.getBorder把默认的border存起，然后添加个MouseListener事件监听，在mouseExited的时候在把你的jlabel.setBorder（你之前存起来的border）；

Answer 3

建议不要这么做，可以替换成一个变色的边框。设置边框会可能会导致整个布局变化。