How to set Scrollable TextArea in Java for group Layout?

Question

I have a problem. Every time, when I add more Symbols(Numbers) to TextArea, it doesn't make it scrollable. EDIT: now it works as I want. I only needed to change 2 words. Thanks.

class NumOnly extends KeyAdapter {  

    private String Atlauts = "[^0-9]";  //Allowed Buttons.
    public void keyReleased(KeyEvent e) {   //Key event. What happens when the button is pressed
        String curText = ((JTextComponent) e.getSource()).getText();  //Current text
        curText = curText.replaceAll(Atlauts, ""); 

        ((JTextComponent) e.getSource()).setText(curText);  
    }  
}  

public class kursadarbs{

    public static void main(String[] args) {

        JFrame frame= new JFrame();
        JPanel panel= new JPanel();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //components
        JLabel label1= new JLabel("Insert first number: ");

        final JTextField textbox1= new JTextField(10);
        textbox1.addKeyListener(new NumOnly());

        JLabel label2= new JLabel("Insert second number: ");

        final JTextField textbox2= new JTextField(10);
        textbox2.addKeyListener(new NumOnly());

        JButton button= new JButton("Calculate");

        final JTextArea textarea= new JTextArea(20,20); //Result is stored in there
        textarea.setEditable(false);
        textarea.setLineWrap(true);
        JScrollPane scroll= new JScrollPane(textarea);
        scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        textarea.setWrapStyleWord(true);
        textarea.setBorder(new TitledBorder(new EtchedBorder(), "Result"));




        GroupLayout groupLayout = new GroupLayout(panel);
        panel.setLayout(groupLayout);  
        groupLayout.setAutoCreateGaps(true);      
        groupLayout.setAutoCreateContainerGaps(true); 

        GroupLayout.SequentialGroup HorSGroup= groupLayout.createSequentialGroup(); 
        GroupLayout.SequentialGroup VerSGroup= groupLayout.createSequentialGroup(); 

        GroupLayout.ParallelGroup HParallelGroup1= groupLayout.createParallelGroup(GroupLayout.Alignment.LEADING);
        GroupLayout.ParallelGroup HParallelGroup2= groupLayout.createParallelGroup(GroupLayout.Alignment.LEADING);
        GroupLayout.ParallelGroup HParallelGroup3= groupLayout.createParallelGroup(GroupLayout.Alignment.LEADING);

        HParallelGroup1.addComponent(label1); //adding components to the group
        HParallelGroup1.addComponent(label2);
        HParallelGroup2.addComponent(textbox1);
        HParallelGroup2.addComponent(textbox2);
        HParallelGroup2.addComponent(scroll);
        HParallelGroup3.addComponent(button);

        HorSGroup.addGroup(HParallelGroup1);
        HorSGroup.addGroup(HParallelGroup2);
        HorSGroup.addGroup(HParallelGroup3);

        GroupLayout.ParallelGroup VerPGroup1= groupLayout.createParallelGroup(GroupLayout.Alignment.BASELINE); //Vertical group
        GroupLayout.ParallelGroup VerPGroup2= groupLayout.createParallelGroup(GroupLayout.Alignment.BASELINE);
        GroupLayout.ParallelGroup VerPGroup3= groupLayout.createParallelGroup(GroupLayout.Alignment.BASELINE);

        VerPGroup1.addComponent(label1); //adding components to groups
        VerPGroup1.addComponent(textbox1);
        VerPGroup1.addComponent(button);
        VerPGroup2.addComponent(label2);
        VerPGroup2.addComponent(textbox2);
        VerPGroup3.addComponent(scroll);

        VerSGroup.addGroup(VerPGroup1);
        VerSGroup.addGroup(VerPGroup2);
        VerSGroup.addGroup(VerPGroup3);

        groupLayout.setHorizontalGroup(HorSGroup);
        groupLayout.setVerticalGroup(VerSGroup);




        Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
        int x = (int) (dimension.getWidth()/4);
        int y = (int) (dimension.getHeight()/4);
        frame.setLocation(x, y); //Places the program almost in the middle

        button.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e)
            {
               //what happens when "calculate" is pressed.
                String first = null, second = null; 
                int first1=0, second1=0;

               first= textbox1.getText();  //getting textbox1 value.
               second= textbox2.getText();

               if(!first.isEmpty() && !second.isEmpty()) //If fields are not empty..
               {
                   first1= Integer.parseInt(first);  //string to integer.
                   second1= Integer.parseInt(second);

                   if(first1<second1){ //Check, if the first number is bigger than second.
                   System.out.println(first1);                 
                   textarea.append(first+"\n");
                   }// Ja ir pareizi 
                   else 
                   {
                       JOptionPane.showMessageDialog(null,"Incorrect data. " );
                   }
               } else 
               {
                   JOptionPane.showMessageDialog(null,"Incorrect data." );
               }
            }
        });


        frame.add(panel); //add the panel
        frame.setSize(500, 500); //program size in pix
        frame.setResizable(false); //putting that the frame can't change size
        frame.setTitle("Kursa darbs");
        frame.setVisible(true);


    }

}

Well, The main problem is the Textarea. As you can see, English is not my native language and I'm a beginner for JFrame. I have tried everything... Please help.

Thank you Already.

Unfortunately, since I don't speak Latvian(?) I am not able to understand what that GUI is supposed to do or how it is supposed to work. Please run the comments, attribute and class names, the button text, & labels through Google translate. — Andrew Thompson, Nov 12 '12 at 13:30
I fixed the comments, but they don't give a lot of new info. The main idea of the programm... Well, I'm making a program which searches prime numbers between 2 inserted numbers (which are inserted in textbox1 and textbox2). I know how to find prime numbers, but I don't know how to make the frame. Kind of stupid, but well... I'm a student, and I like to learn something new. Really this even isn't obligatory for me, but I want it. — Dawgora, Nov 12 '12 at 20:13

score 3 · Answer 1 · edited May 23 '17 at 11:48

3

never ever to use KeyListener for JTextComponents
use DocumentListener instead (allowed to insert String, Copy-Paste, SystemClipBoard, e.i.)
for filtering of unwanted char(s) to use DocumentFilter
use JFormattedTextField with Number formatter instead of parsing number from JTextField or add DocumentFilter with Pattern to JTextField for filtering only numbers

edited May 23 '17 at 11:48

Community

1
1

answered Nov 12 '12 at 13:13

mKorbel

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score 3 · Accepted Answer · answered Nov 12 '12 at 23:13

Instead of adding the JTextArea to the groups, add the JScrollPane that contains it!

    //HParallelGroup2.addComponent(textarea);
    HParallelGroup2.addComponent(scroll);
    HParallelGroup3.addComponent(button);

    HorSGroup.addGroup(HParallelGroup1); //Horizontālās grupas tiek pievienotas sakārtotajai grupai
    HorSGroup.addGroup(HParallelGroup2);
    HorSGroup.addGroup(HParallelGroup3);

    GroupLayout.ParallelGroup VerPGroup1= groupLayout.createParallelGroup(GroupLayout.Alignment.BASELINE); //Izveido Vertikālās grupas.
    GroupLayout.ParallelGroup VerPGroup2= groupLayout.createParallelGroup(GroupLayout.Alignment.BASELINE);
    GroupLayout.ParallelGroup VerPGroup3= groupLayout.createParallelGroup(GroupLayout.Alignment.BASELINE);

    VerPGroup1.addComponent(label1); //Pievieno objektus
    VerPGroup1.addComponent(textbox1);
    VerPGroup1.addComponent(button);
    VerPGroup2.addComponent(label2);
    VerPGroup2.addComponent(textbox2);
    //VerPGroup3.addComponent(textarea);
    VerPGroup3.addComponent(scroll);

Thank you allot, It worked as a charm :) Now I got to learn more about Java. — Dawgora, Nov 13 '12 at 00:49

How to set Scrollable TextArea in Java for group Layout?

2 Answers2