不可见的对象，因为重新绘制方法-Java Swing [英] Invisible objects because repaint method - Java Swing

问题描述

问题来了，因为我覆盖了jPanel的paintComponent方法，所以当我重新绘制时，所有对象都被隐藏，直到我将它们聚焦. 我需要覆盖paintComponent方法，因为它是我在互联网上找到的唯一更改jFrame背景图像的答案.

The problem comes because I overwrite the paintComponent method of a jPanel, so when I repaint all the objets are hidden till I focus them. I need to overwrite the paintComponent method cause it's the only one answer I'd found in internet to change the background image of a jFrame.

所以首先我创建一个jPanel类:

So firstly I create a jPanel class:

    public class JPanelFondoPrincipal extends javax.swing.JPanel {

    public JPanelFondoPrincipal(){    
        this.setSize(800,500);
    }

    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        Dimension tamanio = getSize();
        ImageIcon imagenFondo = new ImageIcon(getClass().getResource("/images/fondo_principal.png"));        
        g.drawImage(imagenFondo.getImage(),0,0,tamanio.width, tamanio.height, null);        
        setOpaque(false);
    }
}

在我的jPanelForm中:

And in my jPanelForm:

private void formWindowOpened(java.awt.event.WindowEvent evt) {                                  
    // TODO add your handling code here:
    JPanelFondo p = new JPanelFondo();
    this.add(p);
    validate();
    p.repaint();
}

我已经尝试将所有Objet(标签，textFields ...)添加到新的面板中，以便可以在重新绘制后添加它，并手动设置所有对象可见性，但是一切仍然不可见.

I'd already tried to add all my Objets (labels, textFields...) to a new Panel so I can add it after repaint, and set all the objets visibles manually but everything is still invisible.

非常感谢，我需要在6天之内完成该应用程序，而我一分钟就会发疯了

Many thanks, I need to finish the app in 6 days and I'm getting crazy by the minute

已解决了CARDLAYOUT问题

推荐答案

• 在运行时不要add/remove JPanels或其内容，请使用

  • don't add / remove JPanels or its contents on runtime, use CardLayout instead

    您的JPanelFondo p = new JPanelFondo();与public class JPanelFondoPrincipal extends javax.swing.JPanel {

    为了获得更好的帮助，请尽快使用 SSCCE ，

    for better help sooner edit your question with an SSCCE,

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