Java 重新创建Jpanel
我一直在尝试将一个图形添加到JForm中的现有JPanel中。这个JForm是在Netbeans中创建的(带有“addjform”选项)。在这种形式下,我放置了一个JPanel。在源代码中,我想更改JPanel,这样会出现一个图形。我一直在尝试这个,但它不起作用。。。有没有可能这样做(如果是真的,我做错了什么?) 问候,, 乔普 (对不起,我的英语不好……我的第一语言不是英语……) 编辑: 一些代码:Java 重新创建Jpanel,java,swing,jpanel,draw,recreate,Java,Swing,Jpanel,Draw,Recreate,我一直在尝试将一个图形添加到JForm中的现有JPanel中。这个JForm是在Netbeans中创建的(带有“addjform”选项)。在这种形式下,我放置了一个JPanel。在源代码中,我想更改JPanel,这样会出现一个图形。我一直在尝试这个,但它不起作用。。。有没有可能这样做(如果是真的,我做错了什么?) 问候,, 乔普 (对不起,我的英语不好……我的第一语言不是英语……) 编辑: 一些代码: /* * To change this template, choose Tools | T
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package javatest;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import javax.swing.JPanel;
/**
*
* @author Joppe
*/
public class JavaTest extends javax.swing.JFrame {
/**
* Creates new form JavaTest
*/
public JavaTest() {
initComponents();
}
/**
* 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() {
jPanel3 = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel3.addContainerListener(new java.awt.event.ContainerAdapter() {
public void componentAdded(java.awt.event.ContainerEvent evt) {
jPanel3ComponentAdded(evt);
}
});
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 380, Short.MAX_VALUE)
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 278, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
private void jPanel3ComponentAdded(java.awt.event.ContainerEvent evt) {
jPanel3 = new JPanel() {
@Override
public void paintComponent( Graphics g ) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
Line2D line = new Line2D.Double(10, 10, 120, 120);
g2.setColor(Color.blue);
g2.setStroke(new BasicStroke(10));
g2.draw(line);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(250,200);
}
};
}
/**
* @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(JavaTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(JavaTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(JavaTest.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(JavaTest.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 JavaTest().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JPanel jPanel3;
// End of variables declaration
}
/*
*要更改此模板,请选择工具|模板
*然后在编辑器中打开模板。
*/
包测试;
导入java.awt.BasicStroke;
导入java.awt.Color;
导入java.awt.Dimension;
导入java.awt.Graphics;
导入java.awt.Graphics2D;
导入java.awt.geom.Line2D;
导入javax.swing.JPanel;
/**
*
*@作者Joppe
*/
公共类JavaTest扩展了javax.swing.JFrame{
/**
*创建新表单JavaTest
*/
公共JavaTest(){
初始化组件();
}
/**
*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(){
jPanel3=newjavax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
addContainerListener(新java.awt.event.ContainerAdapter(){
添加了公共void组件(java.awt.event.ContainerEvent evt){
jPanel3ComponentAdded(evt);
}
});
javax.swing.GroupLayout jPanel3Layout=新的javax.swing.GroupLayout(jPanel3);
setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,380,短。最大值)
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,278,短。最大值)
);
javax.swing.GroupLayout=newjavax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(布局);
layout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel3,javax.swing.GroupLayout.DEFAULT\u SIZE,javax.swing.GroupLayout.DEFAULT\u SIZE,Short.MAX\u值)
.addContainerGap())
);
layout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel3,javax.swing.GroupLayout.DEFAULT\u SIZE,javax.swing.GroupLayout.DEFAULT\u SIZE,Short.MAX\u值)
.addContainerGap())
);
包装();
}//
private void jPanel3ComponentAdded(java.awt.event.ContainerEvent evt){
jPanel3=新的JPanel(){
@凌驾
公共组件(图形g){
超级组件(g);
图形2d g2=(图形2d)g;
Line2D line=新的Line2D.Double(10,10,120,120);
g2.setColor(颜色为蓝色);
g2.设定行程(新基本行程(10));
g2.画(线);
}
@凌驾
公共维度getPreferredSize(){
返回新尺寸(250200);
}
};
}
/**
*@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(JavaTest.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}catch(实例化异常){
getLogger(JavaTest.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}捕获(非法访问例外){
getLogger(JavaTest.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}catch(javax.swing.UnsupportedLookAndFeelException ex){
getLogger(JavaTest.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}
//
/*创建并显示表单*/
invokeLater(new Runnable()){
公开募捐{
新建JavaTest().setVisible(true);
}
});
}
//变量声明-不修改
私有javax.swing.JPanel jPanel3;
//变量结束声明
}
进行自定义绘制时,还需要覆盖面板的getPreferredSize(),以重新运行自定义绘制的大小,否则将假定大小为(0,0),因此无需绘制任何内容。您还应该覆盖最小/最大尺寸
有关更多信息和示例,请阅读上Swing教程的部分
如果您需要更多帮助,请发布适当的SSCCE
,以演示问题
编辑:
上面的代码行创建了一个空面板。稍后会有代码将该面板添加到框架中,但该面板中没有显示任何内容
jPanel3.addContainerListener(new java.awt.event.ContainerAdapter() {
public void componentAdded(java.awt.event.ContainerEvent evt) {
jPanel3ComponentAdded(evt);
}
});
不知道这段代码的意义是什么。将组件添加到jPanel3时应触发该事件。我不明白:
jPanel3.add(....);
代码中的任何位置,因此此事件永远不会发生
jPanel3.addContainerListener(new java.awt.event.ContainerAdapter() {
public void componentAdded(java.awt.event.ContainerEvent evt) {
jPanel3ComponentAdded(evt);
}
});
jPanel3.add(....);
jPanel3 = new JPanel() {
@Override
public void paintComponent( Graphics g ) {
...
private void jPanel3ComponentAdded(java.awt.event.ContainerEvent evt) {
jPanel3 = new JPanel() {
...
JPanel customPanel = new JPanel() {
@Override
protected void paintComponent( Graphics g ) {
super.paintComponent(g);
...
}
@Override
public Dimension getPreferredSize() {
return new Dimension(250,200);
}
};
jPanel3.add(customPanel);