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  1. 05-11-2012, 07:00 AM #1
    kumar.dinesh7
    kumar.dinesh7 is offline Member
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    Default poblem in making textarea scrollable over JPanel

    i am using JPanel with null layout.....
    put a textarea on it but it is not scrolling.....


    plz help me.....
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  2. 05-11-2012, 07:39 AM #2
    wsaryada
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    Default Re: poblem in making textarea scrollable over JPanel

    You need to wrap your textarea in a JScrollPane component. This will add scrolling capability to the textarea.
    Website: Learn Java by Examples
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  3. 05-11-2012, 08:02 AM #3
    kumar.dinesh7
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    Default Re: poblem in making textarea scrollable over JPanel

    i already wrap the textarea in JScrollPane component...but still its not working
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  4. 05-11-2012, 08:48 AM #4
    wsaryada
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    Default Re: poblem in making textarea scrollable over JPanel

    Can you post the section of your program that related how you create a text area and place it inside a scroll pane?
    Website: Learn Java by Examples
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  5. 05-11-2012, 08:51 AM #5
    kumar.dinesh7
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    Default Re: poblem in making textarea scrollable over JPanel

    this is the code......i uses a different class for making textarea scrollable



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





    class text extends JFrame implements KeyListener
    {
    JPanel jp;
    boolean txtChanged = false;
    JTextArea t;
    File file;
    String fname = "";
    String buf="";
    Container c;
    text()
    {
    setUndecorated(true);
    setVisible(true);
    setResizable(true);
    setLocation(550,100);
    setSize(600,650);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    ImageIcon img = new ImageIcon("icon.png");
    setIconImage(img.getImage());
    jp=new JPanel();
    jp.setLayout(null);
    t=new JTextArea();
    JScrollPane scroll= new JScrollPane(t);
    t.setBorder(BorderFactory.createLineBorder(Color.b lack));
    t.setFocusable(true);
    //t.setEditable(false);
    scroll.setVisible(true);
    c = getContentPane();
    c.setLayout(new BorderLayout());
    //add(jp);
    c.add(scroll, BorderLayout.CENTER);
    t.addKeyListener(this);
    try
    {
    FileReader fr=new FileReader("intro.txt");
    BufferedReader br=new BufferedReader(fr);
    while ((buf=br.readLine()) != null)
    {
    t.append(buf);
    t.append("\n");
    }
    br.close();
    fr.close();
    }
    catch (IOException evt)
    {
    System.out.println("Exception: " + evt);
    }
    }


    public void keyPressed(KeyEvent e)
    {
    //System.out.println("KP");
    }

    public void keyReleased(KeyEvent e)
    {
    //System.out.println("KR");
    }
    public void keyTyped(KeyEvent ke)
    {
    txtChanged = true;
    }
    }














    public class array extends JFrame implements ActionListener
    {
    JPanel jp;
    static JButton basic,operation,user_practice,menu;
    JLabel bg,logo;
    array()
    {
    super("Array-Data Structure Tutorial");
    setVisible(true);
    setResizable(true);
    setLocation(0,0);
    setSize(1200,780);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setExtendedState(JFrame.MAXIMIZED_BOTH);
    ImageIcon img = new ImageIcon("icon.png");
    setIconImage(img.getImage());
    jp=new JPanel();
    jp.setBounds(0,0,500,800);
    jp.setLayout(null);
    basic=new JButton("Basic Terminology",new ImageIcon("basic.jpg"));
    operation=new JButton("Operations",new ImageIcon("operation.jpg"));
    menu=new JButton("",new ImageIcon("home.png"));
    user_practice=new JButton("User Practice",new ImageIcon("user.jpg"));
    bg=new JLabel(new ImageIcon("bg1.jpg"));
    logo=new JLabel(new ImageIcon("logo.png"));
    Font f2=new Font("calibri",Font.PLAIN,20);
    Font f3=new Font("Times New Roman",Font.BOLD,15);
    basic.setFont(f2);
    operation.setFont(f2);
    user_practice.setFont(f2);
    menu.setFont(f2);
    add(jp);
    jp.add(basic);
    jp.add(operation);
    jp.add(user_practice);
    jp.add(menu);
    jp.add(bg);
    bg.add(logo);
    basic.addActionListener(this);
    operation.addActionListener(this);
    user_practice.addActionListener(this);
    menu.addActionListener(this);
    basic.setBounds(100,160,250,60);
    operation.setBounds(100,260,250,60);
    user_practice.setBounds(100,560,250,60);
    menu.setBounds(55,30,50,50);
    bg.setBounds(0,0,1300,800);
    logo.setBounds(700,1,850,80);
    text t=new text();
    }


    public void actionPerformed(ActionEvent e)
    {
    if(e.getSource()==menu)
    {
    main m1=new main();
    this.setVisible(false);
    }
    else if(e.getSource()==basic)
    {
    basicarray m1=new basicarray();
    this.setVisible(false);

    }
    else if(e.getSource()==operation)
    {
    operations m2=new operations();
    this.setVisible(false);
    }

    else if(e.getSource()==user_practice)
    {
    practicearray m4=new practicearray();
    this.setVisible(false);
    }

    }

    }
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  6. 05-11-2012, 09:16 AM #6
    wsaryada
    wsaryada is offline Senior Member
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    Default Re: poblem in making textarea scrollable over JPanel

    Please format your code to make it easier to read, use the [code] tag for this.

    By default when the text area have no data or if the data is visible without scrolling the scroll bar will not be displayed. If you want to change this default you can use the other JScrollPane constructor that accept the vertical and horizontal scrollbar policy.
    Website: Learn Java by Examples
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  7. 05-15-2012, 09:42 AM #7
    kumar.dinesh7
    kumar.dinesh7 is offline Member
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    Default Re: poblem in making textarea scrollable over JPanel

    Java Code: 
    import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;





class text extends JFrame implements KeyListener
{
JPanel jp;
boolean txtChanged = false;
JTextArea t;
File file;
String fname = "";
String buf="";
Container c;
text()
{
setUndecorated(true);
setVisible(true);
setResizable(true);
setLocation(550,100);
setSize(600,650);
setDefaultCloseOperation(EXIT_ON_CLOSE);
ImageIcon img = new ImageIcon("icon.png");
setIconImage(img.getImage());
jp=new JPanel();
jp.setLayout(null);
t=new JTextArea();
JScrollPane scroll= new JScrollPane(t);
t.setBorder(BorderFactory.createLineBorder(Color.b lack));
t.setFocusable(true);
//t.setEditable(false);
scroll.setVisible(true);
c = getContentPane();
c.setLayout(new BorderLayout());
//add(jp);
c.add(scroll, BorderLayout.CENTER);
t.addKeyListener(this);
try
{
FileReader fr=new FileReader("intro.txt");
BufferedReader br=new BufferedReader(fr);
while ((buf=br.readLine()) != null)
{
t.append(buf);
t.append("\n");
}
br.close();
fr.close();
}
catch (IOException evt)
{
System.out.println("Exception: " + evt);
}
}


public void keyPressed(KeyEvent e)
{
//System.out.println("KP");
}

public void keyReleased(KeyEvent e)
{
//System.out.println("KR");
}
public void keyTyped(KeyEvent ke)
{
txtChanged = true;
}
}














public class array extends JFrame implements ActionListener
{
JPanel jp;
static JButton basic,operation,user_practice,menu;
JLabel bg,logo;
array()
{
super("Array-Data Structure Tutorial");
setVisible(true);
setResizable(true);
setLocation(0,0);
setSize(1200,780);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setExtendedState(JFrame.MAXIMIZED_BOTH);
ImageIcon img = new ImageIcon("icon.png");
setIconImage(img.getImage());
jp=new JPanel();
jp.setBounds(0,0,500,800);
jp.setLayout(null);
basic=new JButton("Basic Terminology",new ImageIcon("basic.jpg"));
operation=new JButton("Operations",new ImageIcon("operation.jpg"));
menu=new JButton("",new ImageIcon("home.png"));
user_practice=new JButton("User Practice",new ImageIcon("user.jpg"));
bg=new JLabel(new ImageIcon("bg1.jpg"));
logo=new JLabel(new ImageIcon("logo.png"));
Font f2=new Font("calibri",Font.PLAIN,20);
Font f3=new Font("Times New Roman",Font.BOLD,15);
basic.setFont(f2);
operation.setFont(f2);
user_practice.setFont(f2);
menu.setFont(f2);
add(jp);
jp.add(basic);
jp.add(operation);
jp.add(user_practice);
jp.add(menu);
jp.add(bg);
bg.add(logo);
basic.addActionListener(this);
operation.addActionListener(this);
user_practice.addActionListener(this);
menu.addActionListener(this);
basic.setBounds(100,160,250,60);
operation.setBounds(100,260,250,60);
user_practice.setBounds(100,560,250,60);
menu.setBounds(55,30,50,50);
bg.setBounds(0,0,1300,800);
logo.setBounds(700,1,850,80);
text t=new text();
}


public void actionPerformed(ActionEvent e)
{
if(e.getSource()==menu)
{
main m1=new main();
this.setVisible(false);
}
else if(e.getSource()==basic)
{
basicarray m1=new basicarray();
this.setVisible(false);

}
else if(e.getSource()==operation)
{
operations m2=new operations();
this.setVisible(false);
}

else if(e.getSource()==user_practice)
{
practicearray m4=new practicearray();
this.setVisible(false);
}

}

}
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  8. 05-15-2012, 09:44 AM #8
    kumar.dinesh7
    kumar.dinesh7 is offline Member
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    Default Re: poblem in making textarea scrollable over JPanel

    okay thanx......can u tell me how to control the one form by another form...
    like in the above code if i minimize the form then that textarea will also be minimized...

    plz run the above code to understand what i am saying..
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