InterActing InternalFrames in SWING - MDI Application

[Manoj Amrutkar]

Hi,

I have one Swing-MDI Application, where the structure is Outer Frame containing JDesktopPane, Which can open several internalframes.

Now i have two internalframes say IF1 and IF2.

IF1 has two textfields say tf1 and tf2, where as IF2 has third field say tf3. These IF1 and IF2 are interrelated by calculations as follows,

tf3 = tf1 + tf2;

now suppose i have both the frames open simultaniously. And if i enters some value in tf1 and/or tf2 from IF1, The resulted sum should be reflected in tf3 of IF2.

How can i acheive above scenario.

Thanks in advance!

Manoj

[Michael Dunn]

depends on when you want the calculation done

a DocumentListener if you want immediate
e.g. tf2 has 9.00, and you want to enter 123.45 into tf1
tf3 will display (with each keystroke)
10.00
21.00
132.00
132.40
132.45

if you want the calc after entering the number, an actionListener for 'enter'
or for a separate button 'calculate'

[Manoj Amrutkar]

But how exactly to get the reference of second frame?
Some code sample will be really helpfull.

Thanks

[Michael Dunn]

    
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
class Testing
{
  public void buildGUI()
  {
    Frame1 f1 = new Frame1();
    Frame2 f2 = new Frame2();
    f1.buildGUI();
    f2.buildGUI();
    DocumentListener dl = new DocListener(f1.tf1,f1.tf2,f2.tf3);
    f1.tf1.getDocument().addDocumentListener(dl);
    f1.tf2.getDocument().addDocumentListener(dl);
  }
  public static void main(String[] args)
  {
    SwingUtilities.invokeLater(new Runnable(){
      public void run(){
        new Testing().buildGUI();
      }
    });
  }
}
class Frame1
{
  JTextField tf1 = new JTextField(10);
  JTextField tf2 = new JTextField(10);
  public void buildGUI()
  {
    JDesktopPane dp = new JDesktopPane();
    JInternalFrame if1 = new JInternalFrame( "I-F1", true, true, true, true );
    JPanel p = new JPanel();
    p.add(tf1); p.add(tf2);
    if1.setLocation(50,50);
    if1.getContentPane().add(p);
    if1.pack();
    if1.setVisible(true);
    dp.add(if1);
    JFrame f = new JFrame();
    f.getContentPane().add(dp);
    f.setBounds(100,100,400,300);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
  }
}
class Frame2
{
  JTextField tf3 = new JTextField(10);
  public void buildGUI()
  {
    JDesktopPane dp = new JDesktopPane();
    JInternalFrame if2 = new JInternalFrame( "I-F2", true, true, true, true );
    JPanel p = new JPanel();
    p.add(tf3);
    if2.setLocation(50,50);
    if2.getContentPane().add(p);
    if2.pack();
    if2.setVisible(true);
    dp.add(if2);
    JFrame f = new JFrame();
    f.getContentPane().add(dp);
    f.setBounds(600,100,400,300);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
  }
}
class DocListener implements DocumentListener
{
  JTextField input1,input2,output;
  java.text.DecimalFormat df = new java.text.DecimalFormat("0.00");
  public DocListener(JTextField tf1,JTextField tf2,JTextField tf3)
  {
    input1=tf1; input2=tf2; output=tf3;
  }
  public void changedUpdate(DocumentEvent e){setOutput();}
  public void removeUpdate(DocumentEvent e){setOutput();}
  public void insertUpdate(DocumentEvent e){setOutput();}
  public void setOutput()
  {
    String field1 = input1.getText();
    if(field1.equals("")) field1 = "0";
    String field2 = input2.getText();
    if(field2.equals("")) field2 = "0";
    output.setText(df.format(Double.parseDouble(field1)+Double.parseDouble(field2)));
  }
}