CODEWITHSUNDEEP
javaswingscrollbarjscrollpanejtextarea
Marco
Marco

Reputation: 401

Adding scroll bars with Java Swing into a JTextArea

I've seen several posts about this subject but I cannot solve the problem with the information provided there. I'm trying to add scroll bars (vertical and horizontal) with the following code into a JTextArea as follows:

public FPrincipale() {

        JFrame wframe = new JFrame();

        JPanel wpanel = new JPanel(new BorderLayout());
        JPanel tpanel = new JPanel();
        JPanel bpanel = new JPanel(new FlowLayout(FlowLayout.CENTER));

        textzone = new JTextArea(" ",20, 50);
        textzone.setLineWrap(true);
        textzone.setWrapStyleWord(true);

        //Here I try to add the scroll bar
        JScrollPane wscroll = new JScrollPane(textzone, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        wscroll.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
        wscroll.setBorder(BorderFactory.createLineBorder(Color.black));
        wframe.add(wscroll);
        wframe.setVisible(true);

        JButton b1 = new JButton("B1");
        JButton b2 = new JButton("B2");
        JButton b3 = new JButton("Close");      

        bpanel.add(b1);
        bpanel.add(b2);     
        bpanel.add(b3);     
        bpanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));

        tpanel.add(textzone);
        tpanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
        tpanel.add(wscroll, BorderLayout.CENTER);

        wpanel.add(bpanel, BorderLayout.SOUTH);
        wpanel.add(tpanel, BorderLayout.CENTER);

        wframe.setLocation(150, 100);
        wframe.setPreferredSize(new Dimension(640, 480));

        b1.addActionListener(new b1Listener());
        b2.addActionListener(new b2Listener());
        b3.addActionListener(new b3Listener());

        this.getContentPane().setPreferredSize(new Dimension(500,500));     

        wframe.add(wpanel);
        wframe.setVisible(true);
        wframe.setSize(640, 640);
        wframe.setDefaultCloseOperation(EXIT_ON_CLOSE);
        wframe.setTitle("Main Window");
        pack();

    }

Nevertheless, when the window is created the scroll bar doesn't work even if I reduce the window's size:

Normal Window:

enter image description here

Reduced size:

enter image description here

How can I fix this problem?

Upvotes: 0

Views: 57

Answers (1)

MadProgrammer
MadProgrammer

Reputation: 347184

Start by getting rid of the class to setPreferredSize, this are going to mess you up. Later in your code you're calling tpanel.add(textzone);, which is removing the JTextArea from the JScrollPane and adding it to tpanel (you then add the JScrollPane to it was well, which is why you have that little square next to it).

Start by applying a BorderLayout to tpanel

JPanel tpanel = new JPanel(new BorderLayout());

Remove the line where you add the scroll pane to the frame...

//wFrame.add(wscroll);

Then add only the JScrollPane to tpanel

//tpanel.add(textzone);
tpanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
tpanel.add(wscroll, BorderLayout.CENTER);

Upvotes: 1

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