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Thread: Adding Scrollpane to jPanel

  1. #1
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    Default Adding Scrollpane to jPanel

    I have trouble with adding scrollpane to jpanel. I can't find what is the problem, when i run the program scrollpane is not showing.


    import java.awt.Dimension;
    import java.awt.GridLayout;  
    import javax.swing.BorderFactory;  
    import javax.swing.ButtonGroup;  
    import javax.swing.JFrame;  
    import javax.swing.JPanel;  
    import javax.swing.JRadioButton;  
    import javax.swing.JScrollBar;
    import javax.swing.JScrollPane;
     
    class FD  
    {  
        private JPanel mainPanel = new JPanel(); 
     
     
        private JRadioButton[] verticalRadioBtns = new JRadioButton[40];  
        private JRadioButton[] horizontalRadioBtns = new JRadioButton[6];  
        private ButtonGroup btngrpVertical = new ButtonGroup();  
        private ButtonGroup btngrpHorizontal = new ButtonGroup();  
     
        public FD()  
        {  
            JPanel panelVertical = new JPanel(new GridLayout(0, 1, 5, 5));  
            for (int i = 0; i < verticalRadioBtns.length; i++)  
            {  
                verticalRadioBtns[i] = new JRadioButton("radioArrayVertical Button " + i);  
                btngrpVertical.add(verticalRadioBtns[i]);  
                panelVertical.add(verticalRadioBtns[i]);  
            }  
     
            JPanel panelHorizontal = new JPanel(new GridLayout(1, 0, 5, 5));  
            for (int i = 0; i < horizontalRadioBtns.length; i++)  
            {  
                horizontalRadioBtns[i] = new JRadioButton("radioArray2 Button " + i);  
                btngrpHorizontal.add(horizontalRadioBtns[i]);  
                panelHorizontal.add(horizontalRadioBtns[i]);  
            }  
     
            panelVertical.setBorder(BorderFactory.createTitledBorder("Vertical Layout"));  
            panelHorizontal.setBorder(BorderFactory.createTitledBorder("Horizontal Layout"));
     
     
            //HERE IS MY PROBLEM !!!!
            JScrollPane scroll = new JScrollPane(panelVertical,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
     
            mainPanel.add(panelVertical);  
            mainPanel.add(panelHorizontal);
     
        }  
     
        public JPanel getMainPanel()  
        {  
            return mainPanel;  
        }  
     
        private static void createAndShowUI()  
        {  
            JFrame frame = new JFrame("Abbas");  
            frame.getContentPane().add(new FD().getMainPanel());  
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
            frame.pack();  
            //frame.setLocationRelativeTo(null);
            //frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
            frame.setVisible(true);
        }  
     
        public static void main(String[] args)  
        {  
            java.awt.EventQueue.invokeLater(new Runnable()  
            {  
                public void run()  
                {  
                    createAndShowUI();
     
                }  
            });  
        }  
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Adding Scrollpane to jPanel

    Where do you add the JScrollPane object to any container?

  3. #3
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    Default Re: Adding Scrollpane to jPanel

    Aren't these codes adding ?

    JScrollPane scroll = new JScrollPane(panelVertical,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    mainPanel.add(panelVertical);

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Adding Scrollpane to jPanel

    The first statement creates a JScrollPane object.
    The second statement adds panelVertical to the mainPanel container?

    Where do you add scroll to anything?

  5. #5
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    Default Re: Adding Scrollpane to jPanel

    Void - Norm beat me to it.
    Please use [highlight=Java]//code goes here...[/highlight] tags when posting your code

  6. #6
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    Default Re: Adding Scrollpane to jPanel

    Apparently i understood this example all wrong. I will research on it, thank you norm.

    Edit: I read so many articles and i saw that if you want to create an advanced GUI, you have to use hard coding. Up to this time, i have been using netbeans GUI builder, every problem occured because of netbeans standarts. So, now i started over to my project. I want to say that maybe it helps another people.
    Last edited by Onur; August 30th, 2011 at 09:14 AM.

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