java中的GUI“转到上一个/下一个”选项? [英] GUI in java "go to previous/next" option?
问题描述
for(i = 0; i< NumEmployees; i ++)
{
JOptionPane.showMessageDialog(null,
Employee:+ names [i] +\\\
+
ID:+ data [i] [0] +\\\
+
工作时间:+(data [i] [1] + data [i] [2])+\\\
+
加班:+数据[i] [2] +小时+\\\
+
赚取的金额:+付款[i]);
}
使用 Action
分开功能和状态。在下面的示例中,操作会更改索引
和 update()
a JLabel
从
列表< String>
。您的应用程序可能会从列表< Employee>
更新 JTextArea
。
package gui;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
/ **
* @see http://stackoverflow.com/a/20116944/230513
* /
public class PrevNext {
private final列表< String> list = new ArrayList(
Arrays.asList(Alpher,Bethe,Gamow,Dirac,Einstein));
private int index = list.indexOf(Einstein);
private final JLabel label = new JLabel(list.get(index),JLabel.CENTER);
private void display(){
JFrame f = new JFrame(PrevNext);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new JButton(new AbstractAction(< Prev){
@Override
public void actionPerformed(ActionEvent e){
if( - -index <0){
index = list.size() - 1;
}
update();
}
}),BorderLayout.LINE_START) ;
f.add(label);
f.add(new JButton(new AbstractAction(Next>){
@Override
public void actionPerformed(ActionEvent e){
if(++ index == list.size()){
index = 0;
}
update();
}
}),BorderLayout.LINE_END);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
private void update(){
label.setText(list.get(index));
}
public static void main(String [] args){
EventQueue.invokeLater(new Runnable(){
@Override
public void run(){
new PrevNext()。display();
}
});
}
}
Is there a way to have an option to go the a previous message dialog box or a next one? I have a program where after all the input and math calculations is done, a message dialog box appears with the information for "Person 1" then you press ok and the one for "Person 2" appears. It would be nice if there could be an option to be able to navigate between the different dialog boxes. Here is the part of the program that prints the messages.
for (i = 0; i < NumEmployees; i++)
{
JOptionPane.showMessageDialog(null,
"Employee: " + names[i] + "\n" +
"ID: " + data[i][0] + "\n" +
"Hours worked: " + (data[i][1] + data[i][2]) + "\n" +
"Overtime: " + data[i][2] + "hours" + "\n" +
"Amount earned: " + payment[i]);
}
Use Action
"to separate functionality and state from a component." In the example below, the actions change the index
and update()
a JLabel
from a List<String>
. Your application might update a JTextArea
from a List<Employee>
.
package gui;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
/**
* @see http://stackoverflow.com/a/20116944/230513
*/
public class PrevNext {
private final List<String> list = new ArrayList<>(
Arrays.asList("Alpher", "Bethe", "Gamow", "Dirac", "Einstein"));
private int index = list.indexOf("Einstein");
private final JLabel label = new JLabel(list.get(index), JLabel.CENTER);
private void display() {
JFrame f = new JFrame("PrevNext");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new JButton(new AbstractAction("<Prev") {
@Override
public void actionPerformed(ActionEvent e) {
if (--index < 0) {
index = list.size() - 1;
}
update();
}
}), BorderLayout.LINE_START);
f.add(label);
f.add(new JButton(new AbstractAction("Next>") {
@Override
public void actionPerformed(ActionEvent e) {
if (++index == list.size()) {
index = 0;
}
update();
}
}), BorderLayout.LINE_END);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
private void update() {
label.setText(list.get(index));
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new PrevNext().display();
}
});
}
}
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