我有一个 jframe,上面有一个 jpanel,面板经常必须使用 repaint() 和 revalidate() 更改其内容。我已经成功地将图像、文本和按钮按照我希望的方式放置在该 jpanel 上。一切正常,但现在我尝试为 jframe 设置背景,这不会干扰其上面的内容。例如,如果有一棵树的图画,它应该出现在 jpanel 文本的后面,而不会破坏它。我发现 semi 的工作原理是在 jframe 上使用 setContentPane(),添加一个扩展了 jpanel 并覆盖了 PaintComponent() 的类。所有内容都显示在屏幕上,但文本被垂直挤压,并且元素移向框架顶部。
如果我不使用 setContentPane(),而是将背景类添加到框架中,则无论 jpanel 的 setOpaque() 如何,它都不会出现。 我还尝试使用 jLayeredPane,因为我在互联网上读到的内容表明这是正确的答案。但是,我无法让它工作,并且背景仍然隐藏。
private final int WIDTH = 1024;
private final int HEIGHT = 768;
Frame()
{
JFrame frame = new JFrame();
panel = new JPanel();
gbc = new GridBagConstraints();
//Unrelated elements
//font = new Font(Font.MONOSPACED, Font.PLAIN, 20);
//border = BorderFactory.createEmptyBorder();
//imageResizer = new ImageResizer();
frame.setTitle("Shady Path");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(WIDTH, HEIGHT);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
frame.setIconImage(new ImageIcon("res/human.png").getImage());
frame.setContentPane(new DrawPanel());
panel.setLayout(new GridBagLayout());
panel.setOpaque(false);
gbc.anchor = GridBagConstraints.PAGE_START;
frame.add(panel);
frame.setVisible(true);
}
//One of the two methods that change the contents of the jpanel
void appendMain(String mainImage, JTextArea mainText, JButton button)
{
panel.removeAll();
image = new JLabel(imageResizer.resize(200, 200, mainImage));
gbc.insets = new Insets(0, 0, 30, 0);
gbc.gridwidth = GridBagConstraints.REMAINDER;
panel.add(image, gbc);
formatText(mainText);
panel.add(mainText, gbc);
button.setFont(font);
button.setForeground(Color.WHITE);
button.setBackground(Color.BLACK);
button.setBorder(border);
gbc.fill = GridBagConstraints.VERTICAL;
gbc.insets = new Insets(50, 0, 70, 0);
panel.add(button, gbc);
panel.revalidate();
panel.repaint();
}
//This is for the text formating
private void formatText(JTextArea baseText)
{
baseText.setEditable(false);
baseText.setForeground(Color.WHITE);
baseText.setFont(font);
baseText.setLineWrap(true);
baseText.setWrapStyleWord(true);
baseText.setMargin(new Insets(0, 300, 0, 300));
baseText.setOpaque(false);
gbc.insets = new Insets(30, 0, 0, 0);
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
}
//The following code is for the paintComponent() class
//The imageResizer is another class that I made, but it just resizes images and it is unrelated.
public class DrawPanel extends JPanel
{
private Image image;
public DrawPanel()
{
ImageResizer imageResizer = new ImageResizer();
ImageIcon imageIcon = imageResizer.resize(1024, 768, "res/test.png");
image = imageIcon.getImage();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, this);
}
}
最佳答案
嗯...看来@HovercraftFullOfEels 的评论是正确的。从字面上看,我只需将 DrawPanel 的布局设置为 BorderLayout,一切就都解决了。
public DrawPanel()
{
this.setLayout(new BorderLayout());
ImageResizer imageResizer = new ImageResizer();
ImageIcon imageIcon = imageResizer.resize(1024, 768, "res/test.png");
image = imageIcon.getImage();
}
关于java - jframe 的背景 contentPane 会干扰其顶部的 jpanel,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54160644/