Java Can';不要在我的JFrame中添加一个面板(如此背景)
我有一个JPanel,我用它作为背景,名字叫BackgroundPanel。我正在用NetBeans设计我的主JFrame,并添加类似的背景面板Java Can';不要在我的JFrame中添加一个面板(如此背景),java,jframe,jpanel,background-image,Java,Jframe,Jpanel,Background Image,我有一个JPanel,我用它作为背景,名字叫BackgroundPanel。我正在用NetBeans设计我的主JFrame,并添加类似的背景面板 public class Main extends javax.swing.JFrame { Image img = null; public Main() { initComponents(); setTitle("Count To"); setPreferredSize(new Dim
public class Main extends javax.swing.JFrame {
Image img = null;
public Main() {
initComponents();
setTitle("Count To");
setPreferredSize(new Dimension(800, 600));
Image img = null;
try {
img = ImageIO.read(new File("resources/bg.png"));
} catch (IOException e) {System.out.println("Image can't found.");}
BackgroundPanel bgPanel = new BackgroundPanel(img, BackgroundPanel.SCALED, 0.0f, 0.0f);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
getContentPane().add(bgPanel);
pack();
setVisible(true);
//setResizable(false);
setLocationRelativeTo(null);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
setForeground(java.awt.Color.red);
setIconImage(getIconImage());
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Main().setVisible(true);
}
});
}
// Variables declaration - do not modify
// End of variables declaration
}
public类Main扩展了javax.swing.JFrame{
图像img=null;
公用干管(){
初始化组件();
setTitle(“计数到”);
设置首选尺寸(新尺寸(800600));
图像img=null;
试一试{
img=ImageIO.read(新文件(“resources/bg.png”);
}catch(IOException e){System.out.println(“找不到图像”);}
BackgroundPanel bgPanel=新的BackgroundPanel(img,BackgroundPanel.SCALED,0.0f,0.0f);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
getContentPane().add(bgPanel);
包装();
setVisible(真);
//可设置大小(假);
setLocationRelativeTo(空);
}
/**
*从构造函数中调用此方法来初始化表单。
*警告:不要修改此代码。此方法的内容始终为
*由表单编辑器重新生成。
*/
@抑制警告(“未选中”)
//
私有组件(){
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setCursor(新java.awt.Cursor(java.awt.Cursor.DEFAULT_Cursor));
set前台(java.awt.Color.red);
setIconImage(getIconImage());
javax.swing.GroupLayout=newjavax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(布局);
layout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,400,短。最大值)
);
layout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,300,短。最大值)
);
包装();
}//
/**
*@param指定命令行参数
*/
公共静态void main(字符串参数[]){
/*设置Nimbus的外观和感觉*/
//
/*如果Nimbus(在JavaSE6中引入)不可用,请使用默认的外观。
*详情请参阅http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
试一试{
for(javax.swing.UIManager.LookAndFeelInfo:javax.swing.UIManager.getInstalledLookAndFeels()){
if(“Nimbus”.equals(info.getName())){
setLookAndFeel(info.getClassName());
打破
}
}
}捕获(ClassNotFoundException ex){
getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}catch(实例化异常){
getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}捕获(非法访问例外){
getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}catch(javax.swing.UnsupportedLookAndFeelException ex){
getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}
//
/*创建并显示表单*/
invokeLater(new Runnable()){
公开募捐{
new Main().setVisible(true);
}
});
}
//变量声明-不修改
//变量结束声明
}
但是我的背景面板是不可见的,也就是说我的框架没有背景图像,而是纯灰色(这是默认设置)
我希望我的解释清楚。如果您需要,我也可以包括BackgroundPanel类。所有顶级容器(和JInternalFrame
)都有所谓的“根窗格”。这负责实际构建窗口的主要布局
根窗格(基本上)由内容窗格和一个位于窗口顶部的玻璃(和选项菜单栏)组成
将组件添加到窗口时,它们实际上已添加到内容窗格中
在您的情况下,只需将内容窗格替换为您自己的面板,而不是尝试将其添加到现有面板中,这是有意义的
这样,当您向窗口中添加新组件时,它们实际上将被添加到背景窗格中
但是,请确保在尝试向窗口添加任何组件之前更改内容窗格;)
查看更多详细信息将布局管理器表单GroupLayout更改为BorderLayout。或者,将BackgroundPane设置为framesetting BackgroundPanel的内容窗格,因为contentPane很有魅力,谢谢!你能解释一下那里到底发生了什么吗,我想知道。