[英]Java Swing Painting Issue with JButtons
我想做的是使用Swing创建一个桌面应用程序。 我需要在框架中添加背景图片,并在某些特定位置添加一些按钮,这些按钮不应填充其内容区域。 因此,这是我到目前为止所做的;
public class MainGUI extends JFrame {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainGUI window = new MainGUI();
window.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public MainGUI() {
setUndecorated(true);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
this.setSize(screenSize);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
initialize();
}
private void initialize() {
JPanel mainPanel = new JPanel() {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
try {
g.drawImage(new ImageIcon(ImageIO.read(new File("a.png"))).getImage(), 0, 0, null);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
mainPanel.setLayout(new BorderLayout());
JButton btn1 = new JButton();
btn1 .setAlignmentX(Component.CENTER_ALIGNMENT);
btn1 .setContentAreaFilled(false);
btn1 .setBorder(new EmptyBorder(0, 0, 0, 0));
btn1 .setIcon(new ImageIcon("btn1.png"));
JPanel rightButtonPanel = new JPanel();
rightButtonPanel.setLayout(new BoxLayout(rightButtonPanel, BoxLayout.Y_AXIS));
rightButtonPanel.add(btn1);
mainPanel.add(rightButtonPanel, BorderLayout.EAST);
this.setContentPane(mainPanel);
}
}
当我这样做时,setContentAreaFilled(false)功能不起作用。 我想这与绘画有关,但我不确定。 有人可以帮我吗?
因此,我接受了您的代码并对其进行了修改。
主要:
btn1.setOpaque(false);
rightButtonPanel.setBackground(Color.GREEN);
例
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
public class MainGUI extends JFrame {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainGUI window = new MainGUI();
window.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public MainGUI() {
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
initialize();
pack();
}
private void initialize() {
JPanel mainPanel = new JPanel() {
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
}
};
mainPanel.setBackground(Color.RED);
mainPanel.setLayout(new BorderLayout());
JButton btn1 = new JButton();
btn1.setAlignmentX(Component.CENTER_ALIGNMENT);
btn1.setContentAreaFilled(false);
btn1.setOpaque(false);
btn1.setBorder(new EmptyBorder(0, 0, 0, 0));
btn1.setText("This is a test");
JPanel rightButtonPanel = new JPanel();
rightButtonPanel.setBackground(Color.GREEN);
rightButtonPanel.setLayout(new BoxLayout(rightButtonPanel, BoxLayout.Y_AXIS));
rightButtonPanel.add(btn1);
mainPanel.add(rightButtonPanel, BorderLayout.EAST);
this.setContentPane(mainPanel);
}
}
这产生了
因此,不是错误的按钮(至少在这一点上)。
因此,我更改了rightButtonPanel.setBackground(Color.GREEN);
到rightButtonPanel.setOpaque(false);
它产生了
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