Populating JList in Parent window from Child window's save button

[Fidel Edwards]

Hi Folks,

I am new to Java Swings.I have a problem which is described as :

I have two list in Parent window (say list ListA and ListB) .ListA has few items .On Clicking the ListA's item one popup window will be displayed .In this pop-up (child) window we have a TextArea and a save button.

On clicking the Save Button the data entered into the TextArea should be displayed in ListB immediately.

I used this approach in parent window

[list] On clicking the ListA item

   public void valueChanged(ListSelectionEvent e) {     //Overridden from ListSelectionListener
       //Open My Pop-up window
 }
 

[/list]

In pop-up window created text area and button

On clicking button will set the textarea value to the parentwindow.setListB (May be I am wrong here )

So when I click on ListA item gui appears, I enter data and click Save ....!!!
No data display in ListB , while Again clicking the ListA item the previous entered data of ListB appears .

I want to reflect the data in ListB immediately as click on Pop-up save button .

Help me please !

Thanks in advance !!

[Rob Camick]

I don't really understand your question so I'll just point you to the section from the Swing tutorial on How to Use Lists which contains a working example of dynamically adding/removing elements from the ListModel.

Once you understand that example you should be able to customize your code.

[Michael Dunn]

add the new data to ListB's model
(you may also need a custom renderer if you want to display multiple lines from a JTextArea)

if you want to change what's in ListB, set a new model

[Fidel Edwards]

Rob Camick wrote:I don't really understand your question so I'll just point you to the section from the Swing tutorial on How to Use Lists which contains a working example of dynamically adding/removing elements from the ListModel.

Once you understand that example you should be able to customize your code.

Thanks Rob,
It is something like fill the ListB, with whatever we Fill in Child window's TextArea.

It is pretty clear !(I need to notify the Parent Window that child's save button been pressed.)


Thanks for your reply !

[Fidel Edwards]

Michael Dunn wrote:add the new data to ListB's model
(you may also need a custom renderer if you want to display multiple lines from a JTextArea)

if you want to change what's in ListB, set a new model

Thanks Micheal !


I am really new to Java Swing ! Could you explain me or suggest me that how should I write Custom Renderer ?


Again tons of thanks !

[Maneesh Godbole]

Ashish Tiwari wrote:
I am really new to Java Swing ! Could you explain me or suggest me that how should I write Custom Renderer ?

http://java.sun.com/docs/books/tutorial/uiswing/components/list.html#renderer

[Fidel Edwards]

Maneesh Godbole wrote:

http://java.sun.com/docs/books/tutorial/uiswing/components/list.html#renderer

Thanks Maneesh !!

:thumbup:

[Maneesh Godbole]

You are welcome.
It is interesting to note that the "renderer" concept can be used with a JTable as well as JTree along with the list. Check out the tutorials whenever you get time.

[Fidel Edwards]

Maneesh Godbole wrote:You are welcome.
It is interesting to note that the "renderer" concept can be used with a JTable as well as JTree along with the list. Check out the tutorials whenever you get time.

Thanks Maneesh,

For nice tutorial ! But still I am not able to find out the desired solution


I will be more happy if I get something more descriptive (and depicted) well.


Again tons of thanks for early reply !

[Fidel Edwards]

I am not able to find out that how can parent window know that child window has closed. And parent window call repaint() method for ListA.

Having tried lots of Idea but couldn't find the solution.


Thanks in advance !

[Rob Spoor]

A modal dialog will block when setVisible(true) is called on it. Otherwise, a WindowListener and its windowClosed event will work.

[Fidel Edwards]

Rob Prime wrote:A modal dialog will block when setVisible(true) is called on it. Otherwise, a WindowListener and its windowClosed event will work.

Could you elaborate it more ? Still could not find any thing which can help to resolve this issue


Thanks for reply !

[Alan Mehio]

Ashish Tiwari wrote:Hi Folks,

I am new to Java Swings.I have a problem which is described as :

I have two list in Parent window (say list ListA and ListB) .ListA has few items .On Clicking the ListA's item one popup window will be displayed .In this pop-up (child) window we have a TextArea and a save button.

On clicking the Save Button the data entered into the TextArea should be displayed in ListB immediately.

I used this approach in parent window

[list] On clicking the ListA item

   public void valueChanged(ListSelectionEvent e) {     //Overridden from ListSelectionListener
       //Open My Pop-up window
 }
 

[/list]

In pop-up window created text area and button

On clicking button will set the textarea value to the parentwindow.setListB (May be I am wrong here )

So when I click on ListA item gui appears, I enter data and click Save ....!!!
No data display in ListB , while Again clicking the ListA item the previous entered data of ListB appears .

I want to reflect the data in ListB immediately as click on Pop-up save button .

something similar to the below just to give you some idea of intereaction between the main window ( JFrame) and the JDialog

    

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.text.Document;

public class MainWindow  extends JFrame implements ListSelectionListener  {
	
 private JList listA;
 private JList listB;
 private JTextArea textArea;
 private JPanel dialogPanel;

  public MainWindow() {
	  createGui();
  }
  private void createGui() {
	  JPanel panel = new JPanel();
	  Vector<String> vector = new Vector<String>();
	  vector.add("ABC");
	  vector.add("DEF1");
	  vector.add("DEF2");
	  vector.add("DEF3");
	  vector.add("DEF4");
	  vector.add("DEF5");
	  vector.add("DEF6");
	  vector.add("DEF7");
	  vector.add("DEF8");
	  
	  listA = new JList(vector);
	  listA.setSelectedIndex(-1);
	  listA.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      
	   listB = new JList(vector);
	   listB.addListSelectionListener(this);
      JScrollPane scrollA = new JScrollPane(listA);
      JScrollPane scrollB = new JScrollPane(listB);
      panel.add(scrollA);
	  panel.add(scrollB);
	  //panel.setPreferredSize(new Dimension(300,300));
	  this.getContentPane().add(panel);
  }


@Override
public void valueChanged(ListSelectionEvent e) {
	System.out.println("selected");
	JDialog dialog = new MyJDialog(this, listA);
	dialog.setVisible(true);
}

 public static void main(String ...args) {
	 SwingUtilities.invokeLater(new Runnable() {
		 public void run() {
			 MainWindow main = new MainWindow();
			 main.setSize(new Dimension(300,300));
			 main.setLocationRelativeTo(null);
			 main.pack();
			 main.setVisible(true);
		 }
	 });
 }
  
  
  
	
	
}


class MyJDialog extends JDialog implements ActionListener {
	private JList list;
	private JTextArea area;
	public MyJDialog(JFrame frame, JList list) {
		 super(frame);
		 this.list = list;
		 area = new JTextArea(10, 10);
		JButton button = new JButton("Save");
	    button.addActionListener(this);
	    this.getContentPane().add(area, BorderLayout.CENTER);
	    this.getContentPane().add(button, BorderLayout.SOUTH);
	    this.setSize(new Dimension(200,200));
	}
	
	public void actionPerformed(ActionEvent event) {
	  	int lines =area.getLineCount();
	  	if(lines > 0) { // or check for none empty text content 
	  		Document doc = area.getDocument();
	  		/*
	  		 * Bad way to do the below; should use the Document from the JTextArea 
	  		 */
	  		String strLines[] = area.getText().split("\\n");
	  		//Vector<String> vector = new Vector<String>();
	  		for(String str: strLines) {
	  		// vector.add(str);	
	  		}
	  		list.setListData(strLines);
	  		this.dispose();
	  	}
	}
 }

[Fidel Edwards]

Thanks Alan Mehio,


Timber ! Exactly I was looking for the same , Tons of thanks ! I hope today I will not see the JList's ghost in my dream.

Again Thanks for effort and patience!!

[Fidel Edwards]

Thanks Alan ,

After seeing your code I found my mistake . I was doing the same as you did except I forget to write

 list.setListData(strLines);      

that stuck me badly.

Again Thanks !