Java 如何动态删除JPanel？
我有一个GUI，如下所示 我想动态添加/删除面板。我使用Java 如何动态删除JPanel？,java,swing,arraylist,jpanel,Java,Swing,Arraylist,Jpanel,我有一个GUI，如下所示 我想动态添加/删除面板。我使用ArrayList来跟踪JPanel对象。 现在我可以动态添加面板，但当我想删除面板时，我无法获取其属性，因此无法删除它 这是我的密码： public class Main implements ActionListener{ private List <myPanel> mpList; private JPanel btnPanel; private JButton jbtAdd,jbtDelete;
ArrayListJPanelpublic class Main implements ActionListener{
private List <myPanel> mpList;
private JPanel btnPanel;
private JButton jbtAdd,jbtDelete;
private JFrame jf;
private JPanel jp;
private JScrollPane js;
private myPanel mp;
private static int size=0;
private int selectedId=-1;
//private
public Main(){
mpList=new ArrayList<myPanel>();
btnPanel=new JPanel();
jbtAdd=new JButton("addJpanel");
jbtDelete=new JButton("delJpanel");
btnPanel.setLayout(new FlowLayout(FlowLayout.LEFT,1,1));
btnPanel.add(jbtAdd);
btnPanel.add(jbtDelete);
jf=new JFrame("hello");
jp=new JPanel();
js=new JScrollPane(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
//jp.setLayout(new FlowLayout(FlowLayout.LEFT,1,1));
jf.setLayout(new BorderLayout(10,10));
jp.setLayout(new GridLayout(0,1,1,1));
jp.setPreferredSize(new Dimension(500, 82*6));
for(int i=0;i<6;i++){
myPanel mp=new myPanel();
//mp.setSize(400, 82);
//mp.setBounds(0,82*i,480,82);
mp.getFileTypeIconLabel().setText(String.valueOf(i));
mp.setIndexId(size);
size++;
mpList.add(0,mp);
mp.addMouseListener(new MouseListener(){
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
if(2==e.getClickCount()){
System.out.println("indexInd is"+mpList.get(0).getIndexId());
//System.out.println(index);
mpList.get(0).setBackground(Color.yellow);
}
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}});
jp.add(mpList.get(0));
}
js.setViewportView(jp);
jf.setSize(600, 500);
jf.add(btnPanel,BorderLayout.NORTH);
jf.add(js);
jbtAdd.addActionListener(this);
jbtDelete.addActionListener(this);
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String args[]){
new Main();
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getSource()==jbtAdd){
addMyPanel();
}
else if(e.getSource()==jbtDelete){
delMyPanel();
}
}
public void addMyPanel(){
System.out.println("ok");
mp=new myPanel();
mp.getFileTypeIconLabel().setText(String.valueOf(mpList.size()));
mp.setIndexId(size);
System.out.println(size);
size++;
mpList.add(0, mp);
mp.addMouseListener(new MouseListener(){
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
if(2==e.getClickCount()){
System.out.println("indexInd is"+mpList.get(0).getIndexId());
//System.out.println(index);
mpList.get(0).setBackground(Color.yellow);
}
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}});
jp.add(mpList.get(0));
jp.setPreferredSize(new Dimension(500, 82*mpList.size()));
//jp.validate();
js.validate();
//jp.repaint();
js.repaint();
}
public void delMyPanel(){
selectedId=getIndexOfMyPanelById();
if(selectedId>=0){
int indexId=getIndexOfMyPanelById();
jp.remove(mpList.get(indexId));
mpList.remove(indexId);
jp.setPreferredSize(new Dimension(500,82*mpList.size()));
jp.repaint();
}
}
protected int getIndexOfMyPanelById(){
Iterator<myPanel> it=mpList.iterator();
for(int id=0;it.hasNext();id++){
myPanel mp;
mp=it.next();
if(mp.isSelected()){
return id;
}
}
return -1;
}
}
对于一个空间中的多个组件，请使用如图所示的 提示 见（是的。） javagui可能必须在许多平台上工作，在不同的屏幕分辨率上&使用不同的plaf。因此，它们不利于部件的精确放置。要为健壮的GUI组织组件，请使用布局管理器或1，以及布局填充和边框2
JListimport java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class DymanicDownloadList {
// the GUI as seen by the user (without frame)
JPanel gui = new JPanel(new BorderLayout(2, 2));
public void initGUI() {
gui.setBorder(new EmptyBorder(2, 3, 2, 3));
JToolBar tb = new JToolBar();
gui.add(tb, BorderLayout.PAGE_START);
final DefaultListModel<Download> listModel =
new DefaultListModel<Download>();
final JList<Download> list = new JList<Download>(listModel);
list.setCellRenderer(new DownloadListCellRenderer());
list.setVisibleRowCount(3);
gui.add(new JScrollPane(list), BorderLayout.CENTER);
Action add = new AbstractAction("Add Download") {
@Override
public void actionPerformed(ActionEvent e) {
listModel.addElement(new Download());
}
};
Action delete = new AbstractAction("Delete Download") {
@Override
public void actionPerformed(ActionEvent e) {
int index = list.getSelectedIndex();
if (index < 0) {
JOptionPane.showMessageDialog(
list,
"Select a download to delete!",
"Select Download",
JOptionPane.ERROR_MESSAGE);
} else {
listModel.removeElementAt(index);
}
}
};
tb.add(add);
tb.addSeparator();
tb.add(delete);
for (int ii = 0; ii < 2; ii++) {
listModel.addElement(new Download());
}
}
public JComponent getGUI() {
return gui;
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
DymanicDownloadList ddl = new DymanicDownloadList();
ddl.initGUI();
JFrame f = new JFrame("Dynamic LIST");
f.add(ddl.getGUI());
// Ensures JVM closes after frame(s) closed and
// all non-daemon threads are finished
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
// See https://stackoverflow.com/a/7143398/418556 for demo.
f.setLocationByPlatform(true);
// ensures the frame is the minimum size it needs to be
// in order display the components within it
f.pack();
// should be done last, to avoid flickering, moving,
// resizing artifacts.
f.setVisible(true);
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency
SwingUtilities.invokeLater(r);
}
}
class Download {
Download() {
}
}
class DownloadListCellRenderer extends DefaultListCellRenderer {
JPanel downloadPanel = new JPanel(new BorderLayout(10, 10));
JPanel labelStack = new JPanel(new GridLayout(0, 1, 2, 2));
JLabel number = new JLabel("", SwingConstants.CENTER);
JLabel source = new JLabel("File Name Label", SwingConstants.CENTER);
JLabel info = new JLabel("Download Info Label", SwingConstants.CENTER);
JLabel free = new JLabel("Free Label", SwingConstants.CENTER);
JProgressBar progress = new JProgressBar() {
@Override
public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
return new Dimension(400,d.height);
}
};
DownloadListCellRenderer() {
downloadPanel.add(labelStack, BorderLayout.CENTER);
labelStack.setOpaque(false);
number.setFont(number.getFont().deriveFont(40f));
labelStack.add(source);
labelStack.add(info);
labelStack.add(progress);
labelStack.add(free);
downloadPanel.add(labelStack, BorderLayout.CENTER);
downloadPanel.add(number, BorderLayout.LINE_START);
}
@Override
public Component getListCellRendererComponent(
JList list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus) {
JLabel l = (JLabel) super.getListCellRendererComponent(
list, value, index, isSelected, cellHasFocus);
downloadPanel.setBackground(l.getBackground());
number.setText("" + (index + 1));
return downloadPanel;
}
}
import java.awt.*；
导入java.awt.event.ActionEvent；
导入javax.swing.*；
导入javax.swing.border.EmptyBorder；
公共类DymanicDownloadList{
//用户看到的GUI（无框架）
jpanelgui=newjpanel（newborderlayout（2,2））；
public void initGUI（）{
setboorder（新的EmptyBorder（2,3,2,3））；
JToolBar tb=新的JToolBar（）；
添加（tb，BorderLayout.PAGE_START）；
最终默认列表模型列表模型=
新的DefaultListModel（）；
最终JList列表=新JList（列表模型）；
setCellRenderer（新下载的ListCellRenderer（））；
list.setVisibleRowCount（3）；
添加（新的JScrollPane（列表），BorderLayout.CENTER）；
操作添加=新的抽象操作（“添加下载”）{
@凌驾
已执行的公共无效操作（操作事件e）{
listModel.addElement（newdownload（））；
}
};
Action delete=新的抽象操作（“删除下载”）{
@凌驾
已执行的公共无效操作（操作事件e）{
int index=list.getSelectedIndex（）；
如果（指数<0）{
JOptionPane.showMessageDialog(
列表
“选择要删除的下载！”，
“选择下载”，
JOptionPane.ERROR\u消息）；
}否则{
listModel.removeElementAt（索引）；
}
}
};
tb.add（add）；
tb.addSeparator（）；
tb.增加（删除）；
对于（int ii=0；ii<2；ii++）{
addElement（新下载（））；
}
}
公共JComponent getGUI（）{
返回gui；
}
公共静态void main（字符串[]args）{
Runnable r=新的Runnable（）{
@凌驾
公开募捐{
DymanicDownloadList ddl=新的DymanicDownloadList（）；
ddl.initGUI（）；
JFrame f=新JFrame（“动态列表”）；
f、 添加（ddl.getGUI（））；
//确保JVM在帧关闭后关闭，并且
//所有非守护进程线程都已完成
f、 setDefaultCloseOperation（JFrame.DISPOSE_ON_CLOSE）；
//看https://stackoverflow.com/a/7143398/418556 用于演示。
f、 setLocationByPlatform（真）；
//确保框架为所需的最小尺寸
//以便显示其中的组件
f、 包装（）；
//应最后完成，以避免闪烁、移动，
//调整工件大小。
f、 setVisible（真）；
}
};
//应在EDT上创建和更新Swing GUI
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency
SwingUtilities.invokeLater（r）；
}
}
类下载{
下载（）{
}
}
类DownloadListCellRenderer扩展了DefaultListCellRenderer{
JPanel downloadPanel=新的JPanel（新的边界布局（10,10））；
JPanel labelStack=新的JPanel（新的网格布局（0,1,2,2））；
JLabel编号=新的JLabel（“，SwingConstants.CENTER）；
JLabel source=newjlabel（“文件名标签”，SwingConstants.CENTER）；
JLabel info=新的JLabel（“下载信息标签”，SwingConstants.CENTER）；
JLabel free=新的JLabel（“自由标签”，SwingConstants.CENTER）；
JProgressBar进度=新建JProgressBar（）{
@凌驾
公共维度getPreferredSize（）{
维度d=super.getPreferredSize（）；
返回新尺寸（400，d.高度）；
}
};
下载ListCellRenderer（）{
downloadPanel.add（labelStack，BorderLayout.CENTER）；
labelStack.设置不透明（假）；
number.setFont（number.getFont（）.deriveFont（40f））；
labelStack.add（来源）；
labelStack.add（信息）；
添加标签（进度）；
添加标签（免费）；
downloadPanel.add（labelStack，BorderLayout.CENTER）；
downloadPanel.add（编号、边框布局、线条开始）；
}
@凌驾
公共组件GetListCellRenderComponent(
JList列表，
对象值，
整数索引，
他当选了,，
布尔单元（聚焦）{
JLabel=（JLabel）super.getListCellRenderComponent(
列表、值、索引、isSelected、cellHasFocus）；
downloadPanel.setBackground（l.getBackground（））；
number.setText（“+（索引+1））；
返回下载面板；
}
}
jp.setPreferredSize(new Dimension(500, 82*6));
downloadProgress.setBounds(80, 44, 400, 18);
import java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class DymanicDownloadList {
// the GUI as seen by the user (without frame)
JPanel gui = new JPanel(new BorderLayout(2, 2));
public void initGUI() {
gui.setBorder(new EmptyBorder(2, 3, 2, 3));
JToolBar tb = new JToolBar();
gui.add(tb, BorderLayout.PAGE_START);
final DefaultListModel<Download> listModel =
new DefaultListModel<Download>();
final JList<Download> list = new JList<Download>(listModel);
list.setCellRenderer(new DownloadListCellRenderer());
list.setVisibleRowCount(3);
gui.add(new JScrollPane(list), BorderLayout.CENTER);
Action add = new AbstractAction("Add Download") {
@Override
public void actionPerformed(ActionEvent e) {
listModel.addElement(new Download());
}
};
Action delete = new AbstractAction("Delete Download") {
@Override
public void actionPerformed(ActionEvent e) {
int index = list.getSelectedIndex();
if (index < 0) {
JOptionPane.showMessageDialog(
list,
"Select a download to delete!",
"Select Download",
JOptionPane.ERROR_MESSAGE);
} else {
listModel.removeElementAt(index);
}
}
};
tb.add(add);
tb.addSeparator();
tb.add(delete);
for (int ii = 0; ii < 2; ii++) {
listModel.addElement(new Download());
}
}
public JComponent getGUI() {
return gui;
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
DymanicDownloadList ddl = new DymanicDownloadList();
ddl.initGUI();
JFrame f = new JFrame("Dynamic LIST");
f.add(ddl.getGUI());
// Ensures JVM closes after frame(s) closed and
// all non-daemon threads are finished
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
// See https://stackoverflow.com/a/7143398/418556 for demo.
f.setLocationByPlatform(true);
// ensures the frame is the minimum size it needs to be
// in order display the components within it
f.pack();
// should be done last, to avoid flickering, moving,
// resizing artifacts.
f.setVisible(true);
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency
SwingUtilities.invokeLater(r);
}
}
class Download {
Download() {
}
}
class DownloadListCellRenderer extends DefaultListCellRenderer {
JPanel downloadPanel = new JPanel(new BorderLayout(10, 10));
JPanel labelStack = new JPanel(new GridLayout(0, 1, 2, 2));
JLabel number = new JLabel("", SwingConstants.CENTER);
JLabel source = new JLabel("File Name Label", SwingConstants.CENTER);
JLabel info = new JLabel("Download Info Label", SwingConstants.CENTER);
JLabel free = new JLabel("Free Label", SwingConstants.CENTER);
JProgressBar progress = new JProgressBar() {
@Override
public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
return new Dimension(400,d.height);
}
};
DownloadListCellRenderer() {
downloadPanel.add(labelStack, BorderLayout.CENTER);
labelStack.setOpaque(false);
number.setFont(number.getFont().deriveFont(40f));
labelStack.add(source);
labelStack.add(info);
labelStack.add(progress);
labelStack.add(free);
downloadPanel.add(labelStack, BorderLayout.CENTER);
downloadPanel.add(number, BorderLayout.LINE_START);
}
@Override
public Component getListCellRendererComponent(
JList list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus) {
JLabel l = (JLabel) super.getListCellRendererComponent(
list, value, index, isSelected, cellHasFocus);
downloadPanel.setBackground(l.getBackground());
number.setText("" + (index + 1));
return downloadPanel;
}
}