gpt4 book ai didi

java - 如何在透明 JPanel 上添加 JComboBox?

转载 作者:行者123 更新时间:2023-12-01 12:31:03 26 4
gpt4 key购买 nike

我目前正在开发一个 Java 项目。在透明的 JPanel 上添加 JComboBox 时,我遇到了一个问题。单击JComboBox 的元素后,会显示一个tfield(area)。这里我给出了我的项目的三个部分。

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);

}


}

最佳答案

你的代码很难理解,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,这在其他人必须分析您的代码时会有很大帮助。另外,尝试遵循逻辑流程并将相似的项目分组在一起。

我确实注意到的一件事是缺乏布局管理。出现问题的原因可能是您缺乏管理商品的显示位置和显示方式。在构建 GUI 时尝试一次添加和测试一个组件,直到您掌握了一切。

编辑:

似乎添加组合框的唯一位置是在 checkPanel() 方法中,该方法由 refreshMe() 方法触发,该方法是从未调用过添加组合框。

关于java - 如何在透明 JPanel 上添加 JComboBox?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25917662/

26 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com