【求助】自定义背景panel上的组件不显示问题！
我自定义了背景显示面板，背景图片是能够正确显示的。但是在面板上放置的toolbar却不能正常显示。需要将鼠标经过其上时，才能显示出来。问各位大神什么原因！背景面板代码：import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.net.URL;
import javax.swing.JPanel;
/**
*
* @author dongbeisong
*/
public class ImagePanel extends JPanel{
private Image myImage;
/**
* Creates new form ImagePanel
*/
public ImagePanel() {
super();
URL toolbarbackimage = this.getClass().getResource("/edu/upl/huiwencheck/ui/resounce/toolbarback.jpg");
myImage = Toolkit.getDefaultToolkit().getImage(toolbarbackimage);
this.setBounds(0, 0, 930, 70);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2D = (Graphics2D) g;
if (myImage != null) {// 绘制背景
g2D.drawImage(myImage, 0, 0, this.getWidth(), this.getHeight(), this);
}
g2D.dispose();
}
}程序运行时:
鼠标经过后：
问题解决！
代码如下，原因不明public class ImagePanel extends JPanel {
private Image myImage;
/**
* Creates new form ImagePanel
*/
public ImagePanel() {
super();
URL toolbarbackimage = this.getClass().getResource("/edu/upl/huiwencheck/ui/resounce/toolbarback.jpg");
myImage = Toolkit.getDefaultToolkit().getImage(toolbarbackimage);
this.setBounds(0, 0, 930, 70);
setOpaque(false);//必须添加，原因不明
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2D = (Graphics2D) g;
if (myImage != null) {// 绘制背景
g2D.drawImage(myImage, 0, 0, this.getWidth(), this.getHeight(), this);
}
//g2D.dispose();//必须注释掉
}
}
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