How the JOptionPane works
- by DevAno1
How can I control what happens with window after clicking JOPtionPane buttons ? I'm trying to implement simple file chooser. In my frame I have 3 buttons (OK, Cancel, Browse). Browse button opens file search window, and after picking files should return to main frame. Clicking OK will open a frame with the content of the file. Now porblem looks this way. With the code below, I can choose file but directly after that a new frame is created, and my frame with buttons dissapears :
import java.io.File;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.awt.*;
import javax.swing.*;
import java.io.*;
public class Main {
public static void main(String args[]) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
show("Window");
}
});
}
public static void show(String frame_name){
JFrame frame = new JFrame(frame_name);
frame.setPreferredSize(new Dimension(450, 300));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel top = new JPanel();
top.setLayout(new BoxLayout(top, BoxLayout.Y_AXIS));
JFileChooser fc = new JFileChooser(new File("."));
JPanel creator = new JPanel();
creator.setLayout(new BoxLayout(creator, BoxLayout.Y_AXIS));
creator.add(top);
String[] buttons = {"OK", "Cancel", "Browse"};
int rc = JOptionPane.showOptionDialog(
null,
creator,
frame_name,
JOptionPane.DEFAULT_OPTION,
JOptionPane.PLAIN_MESSAGE,
null,
buttons,
buttons[0]
);
String approveButt = "";
switch(rc){
case 0:
break;
case 1:
break;
case 2:
approveButt = buttons[rc];
int retVal = fc.showDialog(null, approveButt);
if (retVal == JFileChooser.APPROVE_OPTION)
System.out.println(approveButt + " " + fc.getSelectedFile());
break;
}
frame.pack();
frame.setVisible(true);
}
}
With the second code I can return to my menu, but in no way I am able to pop this new frame, which appeared with first code. How to control this ? What am I missing ?
public class Main {
public static void main(String args[]) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
show("Window");
}
});
}
public static void show(String frame_name){
JFrame frame = new JFrame(frame_name);
frame.setPreferredSize(new Dimension(450, 300));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel top = new JPanel();
top.setLayout(new BoxLayout(top, BoxLayout.Y_AXIS));
JFileChooser fc = new JFileChooser(new File("."));
JPanel creator = new JPanel();
creator.setLayout(new BoxLayout(creator, BoxLayout.Y_AXIS));
creator.add(top);
String[] buttons = {"OK", "Cancel", "Browse"};
String approveButt = "";
Plane m = null;
int rc = -1;
while (rc != 0) {
rc = JOptionPane.showOptionDialog(
null,
creator,
frame_name,
JOptionPane.DEFAULT_OPTION,
JOptionPane.PLAIN_MESSAGE,
null,
buttons,
buttons[0]
);
switch (rc) {
case 0:
m = new Plane();
case 1:
System.exit(0);
case 2:
approveButt = buttons[rc];
int retVal = fc.showDialog(null, approveButt);
if (retVal == JFileChooser.APPROVE_OPTION)
System.out.println(approveButt + " " + fc.getSelectedFile());
break;
default:
break;
}
}
addComponents(frame.getContentPane(), m);
frame.pack();
frame.setVisible(true);
}
private static void addComponents(Container c, Plane e) {
c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS));
c.add(e);
}
}
class Plane extends JPanel {
public Plane(){
}
@Override
public void paint(Graphics g){
g.setColor(Color.BLUE);
g.fillRect(0, 0, 400, 250);
}
}
