Re: Programatically displ

From:

"Ian Wilson" <ian.wilson@THRWHITE.remove-dii-this>

Newsgroups:

comp.lang.java.gui

Date:

Wed, 27 Apr 2011 15:39:47 GMT

Message-ID:

<46fbd084$0$8426$db0fefd9@news.zen.co.uk>

To: comp.lang.java.gui
Chanchal wrote:

Hi All,

I have a JScrollPane on a JFrame. The JScrollPane contain a JPanel.On
click of a JButton, i'm adding new JButtons to this JPanel, side by
side.

import javax.swing.*;
import java.awt.event.*;

public class DynamicScroll extends JFrame implements ActionListener{

    private int buttonCount = 0;
    private JButton jButton1;
    private JPanel jPanelInScrollPane;
    private JScrollPane jScrollPane1;

    public DynamicScroll() {
        jScrollPane1 = new JScrollPane();
        jPanelInScrollPane = new JPanel();
        jButton1 = new JButton();

        getContentPane().setLayout(null);
        jPanelInScrollPane.setLayout(null);

        jScrollPane1.setViewportView(jPanelInScrollPane);
        getContentPane().add(jScrollPane1);
        jScrollPane1.setBounds(40, 40, 320, 80);

        jButton1.setText("Add Button");
        jButton1.addActionListener(this);

        getContentPane().add(jButton1);
        jButton1.setBounds(150, 170, 120, 23);

    }

    public void actionPerformed(ActionEvent evt) {
       JButton newButton = new JButton("Button "+ buttonCount);
        newButton.setBounds( buttonCount * (100)+10, 5, 100, 50);
        jPanelInScrollPane.add(newButton);
        buttonCount ++ ;
        jPanelInScrollPane.repaint();
        jPanelInScrollPane.validate();

jScrollPane1.validate();

    }

    public static void main(String args[]) {
        DynamicScroll ds = new DynamicScroll();
        ds.setSize(400,300);
        ds.setVisible(true);
    }
}

Starting from the 4th button which is added dynamically, the buttons
goes outside the JScrollPane. I want the scrollbars of the JScrollPane
to appear when the dynamically added buttons are outside the area of
the JScrollPane so that i can scroll and view all the added JButtons.
Kindly advice on how this can be done.

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class DynamicScroll2 extends JPanel implements ActionListener{

     private int buttonCount = 0;
     private JButton jButton1;
     private JPanel jPanelInScrollPane;
     private JScrollPane jScrollPane1;

     public static void main(String args[]) {
         JFrame f = new JFrame("Dynamic Scroll 2");
         DynamicScroll2 ds = new DynamicScroll2();
         f.add(ds);
         f.setSize(400,300);
         f.setVisible(true);
     }

     public DynamicScroll2() {
         jPanelInScrollPane = new JPanel();
         jPanelInScrollPane.setLayout(
                 new BoxLayout(jPanelInScrollPane, BoxLayout.LINE_AXIS));

         jScrollPane1 = new JScrollPane(jPanelInScrollPane);

         jButton1 = new JButton("Add Button");
         jButton1.addActionListener(this);

         setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
         add(jScrollPane1);
         add(jButton1);
     }

     public void actionPerformed(ActionEvent evt) {
        JButton newButton = new JButton("Button:"+ buttonCount);
         newButton.setBounds( buttonCount * (100)+10, 5, 100, 50);
         jPanelInScrollPane.add(newButton);
         buttonCount ++ ;
         jScrollPane1.validate();
     }
}

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