我目前正在开发一个Java项目。在透明JComboBox
上添加JPanel
时,我遇到了问题。单击tfield(area)
的元素后显示JComboBox
。在这里,我给出了我项目的三个部分。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.plaf.nimbus.NimbusLookAndFeel;
public class Test {
private static Panel1 p1 = new Panel1();
// private static Panel2 p2 = new Panel2();
// private static Panel3 p3 = new Panel3();
private static int i;
private static JPanel pl1;
private static Image icon;
private static Ads panel;
public Test()
{
setLookAndFeel();
JMenuBar m = new JMenuBar();
JMenu about = new JMenu("About");
JFrame f = new JFrame();
f.setTitle("SUPERSHOP MANAGEMENT");
f.setSize(900, 700);
f.setLayout(null);
icon = new ImageIcon("C:\\Users\\Montasir\\desktop\\12.jpg").getImage();
panel = new Ads(icon);
f.add(panel);
pl1 = new JPanel();
pl1.setBounds(0, 0, 900, 200);
pl1.setBackground(new Color(0, 0, 0, 0));
JButton button1 = new JButton("ITEM");
JButton button2 = new JButton("UPDATE");
JButton button3 = new JButton("DAILY SALES");
pl1.add(button1);
pl1.add(button2);
pl1.add(button3);
panel.add(pl1);
button1.setBackground(Color.CYAN);
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setI(1);
// refreshMe();
}
});
button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setI(2);
//refreshMe();
}
});
button3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
setI(3);
// refreshMe();
}
});
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
f.setResizable(false);
}
public static void setI(int j) {
i = j;
}
public static void refreshMe() {
checkPanel();
}
public static void checkPanel() {
if (i == 1) {
panel.add(p1);
//panel.remove(p2);
// panel.remove(p3);
//panel.revalidate();
// panel.repaint();
} /*else if (i == 2) {
panel.add(p2);
panel.remove(p1);
panel.remove(p3);
panel.revalidate();
panel.repaint();
}else if (i == 3) {
panel.add(p3);
panel.remove(p1);
panel.remove(p2);
panel.revalidate();
panel.repaint();
}*/
}
public static void main(String[] args)
{
new Test();
}
public static void setLookAndFeel()
{
try
{
UIManager.setLookAndFeel(new NimbusLookAndFeel());
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
class Panel1 extends JPanel{
private JComboBox comb ;
private JButton b = new JButton("Add items");
public Panel1() {
Test.setLookAndFeel();
setLayout(new FlowLayout());
this.setBackground(new Color(0,0,0,0));
this.setBounds(0,200,900,500);
final String[]name={"Aziz","masum","sakib","shaon"};
comb=new JComboBox(name);
this.setPreferredSize(new Dimension(900,600));
this.add(comb);
}
}
class Ads extends JPanel {
private Image img;
public Ads(Image s)
{
this.img = s;
Dimension size = new Dimension(s.getWidth(null), s.getHeight(null));
setPreferredSize(size);
setMinimumSize(size);
setMaximumSize(size);
setSize(size);
setLayout(null);
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawImage(img, 0, 0,null);
}
}
答案 0 :(得分:1)
你的代码很难遵循,所以我做了一个基本的例子。
import java.awt.BorderLayout;
import javax.swing.*;
public class TestBox extends JFrame{
public static void main(String[] args)
{
new TestBox();
}
public TestBox()
{
//comboBox creation
final String[] name = {"Aziz", "masum", "sakib", "shaon"};
JComboBox comboBox=new JComboBox(name);
//transparent JPanel creation
JPanel mainPanel = new JPanel(new BorderLayout()); // transparent frame to add comboBox
mainPanel.add(comboBox, BorderLayout.NORTH); // comboBox added to transparent frame
//now dealing with the creation of the JFrame to display it all
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
this.setLayout(new BorderLayout());
//adding everything to the frame
this.add(mainPanel, BorderLayout.CENTER);
this.pack();
this.setVisible(true);
}
}
请尝试使用描述性名称,当其他人必须分析您的代码时,它会有所帮助。此外,尝试遵循逻辑流程并将类似的项目组合在一起。
我注意到的一件事是缺乏布局管理。您可能无法管理项目的显示位置和方式,这是您遇到问题的原因。在构建GUI时,请尝试一次添加和测试一个组件,直到您完成任务为止。
修改强>
似乎唯一添加了组合框的地方是checkPanel()
方法,该方法由refreshMe()
方法触发,永远不会调用该方法来添加组合框。