swing动态JPanel加法
我正在尝试创建一个动态Swing GUI。当我点击添加/删除按钮时,我需要添加/删除JPanels
。我无法动态添加JPanels
。最初JPanel
加载,但JPanels
数组无法工作。我该怎么做
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.print.attribute.standard.JobHoldUntil;
import javax.swing.*;
public class AccessoryFileChooser2 extends JFrame {
JFileChooser chooser = null;
JLabel statusbar;
JLabel file;
JCheckBox checkBox;
int count;
int increment;
JPanel [] panel = new JPanel[10]; //array
public AccessoryFileChooser2() {
setSize(350, 200);
count=0;
increment=1;
setDefaultCloseOperation(EXIT_ON_CLOSE);
final Container c = getContentPane();
c.setLayout(new BorderLayout());
checkBox =new JCheckBox("");
String fileName = "Choose File Name";
file = new JLabel(fileName);
final JButton accButton = new JButton("Browse");
final JButton add = new JButton("Add");
final JButton validate = new JButton("Validate");
final JButton delete = new JButton("Delete");
accButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
int option = chooser.showOpenDialog(AccessoryFileChooser2.this);
if (option == JFileChooser.APPROVE_OPTION) {
statusbar.setText(
(
chooser.getSelectedFile().getPath()));
}
}
});
statusbar = new JLabel("Output of your selection will go here");
chooser = new JFileChooser();
final JPanel panels =new JPanel();
//JPanel panel2 =new JPanel();
panel[count]=new JPanel();
panel[count].add(checkBox);
panel[count].add(file);
panel[count].add(accButton );
panel[count].add(statusbar);
c.add(panel[count],BorderLayout.CENTER);
panels.add(add);
panels.add(delete);
panels.add(validate);
add.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
count=count+1;;
increment=increment+1;;
panel[count]=new JPanel();
System.out.println("You clicked the ADD button");
panel[count].add(checkBox);
panel[count].add(file);
panel[count].add(accButton );
panel[count].add(statusbar);
panel[count].revalidate();
panel[count].repaint();
panel[count].updateUI();
c.add(panel[count]);
}
});
delete.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
increment--;
System.out.println("You clicked the Delete button");
System.out.println(checkBox.isSelected());
for (int i = 0; i < panel.length; i++) {
JCheckBox box=(JCheckBox) panel[i].getComponent(0);
if(box.isSelected()){
c.remove(panel[i]);
}
}
}
});
validate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
System.out.println("You clicked the Validate button");
}
});
c.add(panels,BorderLayout.SOUTH);
}
public static void main(String args[]) {
AccessoryFileChooser2 afc = new AccessoryFileChooser2();
afc.setVisible(true);
}
}
# 1 楼答案
不是那么不对,有很多新手犯的错误
1/因为与您为
JPanels
创建数组的方式相同您需要为其
JComponents
创建Array
,因为一个JComponent一次只能添加一次编辑:部分修订/更改代码显示了该问题
将此输出发送到GUI
2/等等
不要这样做,如果您多次添加和删除
JPanel[]
,性能可能会有很多问题。。。,GUI将被冻结,或将无法响应最好按照建议here用一个
TableColumn
来寻找JTable
# 2 楼答案
我在以下方面取得了成功:
在运行时更改gui之后。创建、删除和移动面板时,我在组件/容器上调用这两种方法
# 3 楼答案
在可视GUI中添加或删除组件时,一般代码应为:
重新验证基本上会调用布局管理器
重新绘制可确保组件重新绘制,以防布局发生更改
# 4 楼答案
在
c.add(panel[count]);
之后添加c.validate()
以更新GUI还建议检查当前
JPanel
的数量,因为这样,你会很快得到ArrayIndexOutOfBoundsException