Panel in ScrollPane!!!

What I want is the following: If I enlarge my Panel(Dimension) , I want my scrollbar to adjust so I can scroll left and and right to see the whole Panel in the ScrollPane. I can see my scroller but the will not change So I can see the whole Panel.
Here's my code.
class Grafiekxt extends Panel implements Observer{
int breedte,hoogte,ymultiplier;
double ynul;
Vector vect = new Vector();
int counter;
int x;
int y;
Populatie p;
Grafiekxt(int breedte,int hoogte){
setLayout(null);
this.breedte=breedte-3;
this.hoogte=hoogte-5;
this.x = breedte;
this.y = hoogte;
ynul=this.hoogte/2.0;
public Dimension getPreferredSize() {
if(p!=null){
          if((p.getXteller()*20)>breedte){
          x = p.getXteller()*20;
     return new Dimension(x,y);
public void update(Observable obs, Object arg){
p = (Populatie) obs;
if(p.getXteller()==1){
          vect.clear();
     Double fw = new Double((p.getFunctiewaarde(p.indexVanBesteIndividu())));
vect.add(fw);
repaint();
public double bestOf(){
     // de methode zal de grootste absolute double retourneren die in de vector zitten.
     double best = Math.abs(((Double)vect.elementAt(0)).doubleValue());
     for(int i = 0;i < vect.size();i++){
          if(Math.abs(((Double)vect.elementAt(i)).doubleValue())>best){
               best =      Math.abs(((Double)vect.elementAt(i)).doubleValue());
     return best;
public void paint(Graphics g){
     g.setColor(Color.white);
     g.drawLine(0,0,0,hoogte);
     if(p!=null){
          ymultiplier = (int)(ynul/bestOf());
          for(int i = 0; i < p.getXteller(); i++){
               if((i*20) > breedte){
                    breedte = breedte+(i*20);
                    x = breedte;
               g.drawLine(0,(int)ynul,breedte,(int)ynul);
               g.drawLine((i+1)*20, (int)(ynul+2), (i+1)*20, (int)(ynul-2));
               g.drawString(""+i, (i+1)*20, (int)(ynul-2));
               g.drawRect((i+1)*20,(int)(ynul-(((Double)vect.elementAt(i)).doubleValue())*ymultiplier) , 1, 1);
}

Anybody, please

Similar Messages

How to scroll panels using scrollpane?

i am having two panels containing different images in a main panel.
my problem is that due to big size only one panel is visible in run time so i want to add scrollbar to the main panel.
i have used scrollpane for the main panel but i am getting confused that at which event i should put the code of repainting the visible area.
can anybody tell me how to implement this.
plz... help

gaurav_mishra wrote:
actually i am working in netbeans so i don't know where is the paint method of the panel.can anybody plz help me get rid of this problemApparently we were all mistaken by your description, it looked like you were writing a custom JPanel subclass, with a custom paintComponent() method that would draw the images...
I don't know how you display images in a Panel with NetBeans, but presumably it re-uses some existing JComponent and it doesn't have to generate a paintComponent() method.
At that step you should consider the very first reply: please post some code, the shortest running example that demonstrates your problem.
If you're reluctant, try a simple scroll example: put a single JButton in a JPanel with a FlowLayout, using an image as the button's icon. Stuff this panel into a JScrollPane, itslef in a JFrame, run the app and resize the JFrame. Check whether the button displays appropriately. If it does, try to check what's different with your problematic case.
I like NetBeans (or merely, NetBeans's GUI designer), but it's not the best way to learn Swing programming, which looks like what you're doing.

How to make the panel with scrollpane transparent?

Thanks Camicker for your help, it solves the problem but i got a new problem i.e. i want to make that panel with scrollbar transparent for this i have tried setOpaqe(false) for both scrollpane and panel but it doesn't work. do u have any solution?

I think camickr (not Camicker) already told you to set the opacity of the JScrollPane's viewport.
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db

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I want to include panels dynamically into the scroll pane. Which layout should I select for this ? I read that for scroll panes, only ScrollPaneLayout can be used, but it does not work for my application. Can anyone tell me please how do I add the panels to it ? The code I m using is as follows:
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Make an intermediate panel:
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scrollPane.setViewportView(intermediate);and then:
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I tried validate, update , repaint

Hey, well I've had the same question. repaint() doesn't seem to work. Anyway, I've found a trick that works sometimes.
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JLabel label;
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when you want to refresh your window, try something like this:
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Adding panel to scrollpane on button click

Please run the below code with
javac MyTestingNew.java and
java MyTestingNew
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You really should start learning how to use LayoutManagers.. they make life a lot easier
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
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Put those components in a JPanel overwriting the getInsets() method like this:
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I would like to implement a scroll pane which is resizable, but not to a size exceeding the maximum size of the java.awt.Canvas that it contains.
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import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
public class ScrollPaneTest
    GraphicCanvas canvas;
    CustomScrollPane scrollPane;
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        canvas = new GraphicCanvas();
        scrollPane = new CustomScrollPane();
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        GridBagConstraints gbc = new GridBagConstraints();
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        public void windowClosing(WindowEvent e)
            System.exit(0);
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                               GridBagConstraints gbc)
        gbc.anchor = GridBagConstraints.EAST;
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        gbc.anchor = GridBagConstraints.WEST;
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class GraphicCanvas extends Canvas
    int width, height;
    public GraphicCanvas()
        width = 300;
        height = 300;
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        super.paint(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        int dia = Math.min(width, height)*7/8;
        g2.setPaint(Color.blue);
        g2.draw(new Rectangle2D.Double(width/16, height/16, width*7/8, height*7/8));
        g2.setPaint(Color.green.darker());
        g2.draw(new Ellipse2D.Double(width/2 - dia/2, height/2 - dia/2, dia-1, dia-1));
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        g2.draw(new Line2D.Double(width/16, height*15/16-1, width*15/16-1, height/16));
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        return new Dimension(width, height);
    public Dimension getMaximumSize()
        return getPreferredSize();
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        width = w;
        repaint();
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        height = h;
        repaint();
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        Component child = getComponent(0);
        if(child != null)
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            d.width += insets.left + insets.right;
            d.height += insets.top + insets.bottom;
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        return minimumSize;
    public Dimension getMaximumSize()
        Component child = getComponent(0);
        if(child != null)
            return child.getMaximumSize();
        return null;
class FrameSizer extends ComponentAdapter
    Frame f;
    public FrameSizer(Frame f)
        this.f = f;
    public void componentResized(ComponentEvent e)
        Dimension needed = getSizeForViewport();
        Dimension size = f.getSize();
        if(size.width > needed.width || size.height > needed.height)
            f.setSize(needed);
            f.pack();
     * returns the minimum required frame size that will allow
     * the scrollPane to be displayed at its preferred size
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        ScrollPane scrollPane = getScrollPane(f);
        Insets insets = f.getInsets();
        int w = scrollPane.getWidth() + insets.left + insets.right;
        int h = getHeightOfChildren() + insets.top + insets.bottom;
        return new Dimension(w, h);
    private ScrollPane getScrollPane(Container cont)
        Component[] c = cont.getComponents();
        for(int j = 0; j < c.length; j++)
            if(c[j] instanceof ScrollPane)
                return (ScrollPane)c[j];
            if(((Container)c[j]).getComponentCount() > 0)
                return getScrollPane((Container)c[j]);
        return null;
    private int getHeightOfChildren()
        Component[] c = f.getComponents();
        int extraHeight = 0;
        for(int j = 0; j < c.length; j++)
            int height;
            if(((Container)c[j]).getComponent(0) instanceof ScrollPane)
                height = ((Container)c[j]).getComponent(0).getHeight();
            else
                height = c[j].getHeight();
            extraHeight += height;
        return extraHeight;
}

ScrollPane Problem breaking my heart...

HI .I Want to read in a number from a textfield.This number will decide how many textfileds will appear on a panel. I want to then add this panel to a ScrollPane.I have this working but when the panel is in the scrollPane it doesnt scroll down the full length of the panel
heres my code structure
Create Scrollpane
Read integer
Create panel with textFields
Add Panel to Scrollpane
Add ScrollPane
Is this the wrong way.....
Any help really appreciated

The client area of a ScrollPane is sized according to the components preferred size. The return value of the panels getPreferredSize is interesting. Does it have the value you expect?
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}The other possible problem is the validation. When is the layout performed?
public void doLayout()
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Ragnvald.

Scrollpane remains big!

hi guys
I have my JFrame, and the contentpane has xPanel on left hand side and a JScrollPane in centre. The JScrollpane contains yPanel, and yPanel is cardLayout.
JFrame's size is set to be half the width and height.
xPanel contains buttons, that do SQL queries, and the result of the SQl query returned is put inside JButtons as text and these JButtons are put inside yPanel.
If 1 row is returned, we only add 1 button to xPanel. No scrollbars appear, obviously, as they dont need to for one button only.
If 100 rows are returned from SQL query, yPanel will contain 100 buttons in a column. So the ScrollPane bars come, which is correct , so that we can scroll up and down.
The problem is:
If the next query returned 1 row again, the ScrollPane is still the big size! The scrollbars are still there even though we dont need them as we only have one JButton in the yPanel now.
How can we sort this out please?
Thanks.

The JScrollpane contains yPanel, and yPanel iscardLayout.
I would do it the other way around. Add the panel and
scrollPane to the CardLayout. That is replace the
scrollPane in the CardLayout everytime, not the panel.Thank you.

Adding Buttons to a ScrollPane??

Hello Swing people,
I have had this problem now for quite some time and still have had no luck in getting it right. I am coding an ordering system and on this form is a Jtable displaying product details. Beside the Jtable are category buttons one after the other in a vertical line and there are 18 of them - meaning they cannot fit on the screen!! Therefore i want these buttons to be in some kind of scollpane or list so they can all be viewed.
I thought this would be a simple matter of adding buttons to a scrollpane and then to the panel but this has proved not the case! Does anyone know how i could do this as i have been trying this for too long without the help of you geniuses???
To give u an idea of what i was trying here is a snippet of my code:
import javax.swing.*;
public class junk2 extends JFrame{
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     JPanel panel = new JPanel();
     panel.setLayout(new java.awt.GridLayout(0, 1) );
     JButton []button = new JButton[20];
     for(int i=0; i<button.length; i++) {
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          panel.add(button[i]);
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     getContentPane().add(scroll, java.awt.BorderLayout.CENTER);
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     setDefaultCloseOperation( EXIT_ON_CLOSE );
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This code is fine and puts buttons in a vertical line but the buttons only have numbers on them from 1-20, i want the names of the buttons i have declared to be in here - therefore allowing the action performed on these buttons to be recognised and therefore work too! - anyone know how to get around this??
Also the scrollpane with these buttons in apears in a whole new frame being that it is a small test program but does anyone know how to ensure the buttons appear in the scrollpane only and not in a new frame??
all 25 dukes if someone can sort this long problem out!!!

Hi guys thanks a lot for your replies, i compiled both of them and they are fine! the first reply is more what i am looking for but there is still a problem, i am finding it difficult to incorporate this piece of code into my order form class.
Im trying to take out the current declarations of my JButtons and replace it with the code i was given (reply 1) and obviously keep my action performed methods there as they will be the same but cant seem to do this!
If anyone can add in the code from reply 1 into my code below or at least help me i will give u the 25 dukes, taking into consideration i still want the form (panel) to be displayed as well as the panel or scrollpane containing the JButtons???
Can u help - cheers in advance!!
Pc
public class OrderForm extends JFrame implements ActionListener {
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salads,cakes,frozen,meat,cheeses,sauces,dry,drinks,soup,cleaning,boxes,cups,cutlery,lids,misc,stick,soup2;
     private JScrollPane pane;
     private JTextField textorderno,textorderdate,textdelivdate,textemp,textshop,textsupp;
     private JLabel heading1,heading2,orderno,orderdate,delivdate,emp,shop,supplier;
     private String todaysDate, deliveryDate;
     private ResultSet result;
     private ResultSet shops;
     private int column_count;
     private JComboBox combobox;
     ResultSetTableModel model = new ResultSetTableModel();
     Result rs = new Result();
     Orders orderSaving = new Orders();
     ProductOrders tableSaving = new ProductOrders();
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     JTable table;
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          setTitle("Pret Ordering System");
          setSize(700,600);
          // Center the frame
          Dimension dim = getToolkit().getScreenSize();
          setLocation(dim.width/2-getWidth()/2, dim.height/2-getHeight()/2);
          //Creates the coloured bored around the panel
          panel = new JPanel();
          panel.setLayout( null );
          Border paneltitled = BorderFactory.createLineBorder(Color.red.darker().darker(),10);
          panel.setBorder(paneltitled);
          ResultSet result = rs.setBreadProds();
          model.fillTableModel(result);
          table = new JTable(model);
          for(int i = 0; i < column_count; i++) {
               table.getColumnModel().getColumn (i).setPreferredWidth (200);
          table.setSelectionForeground( Color.white );
          table.setSelectionBackground( Color.red.darker().darker() );
          pane = new JScrollPane(table);
              pane.setBounds(190, 230, 440, 200);
              panel.add(pane);
          combobox = new JComboBox();
          ResultSet shops = rs.getSupplierNames();
          while(shops.next()){
               combobox.addItem(shops.getString("supplier_name"));
//Hope you can help - cheers

Adding Jtree to Panel

Hi all,
I have a JTree in a scrollpane rendered with checkbox on each node. I
When I try adding to JFrame its displaying with scrollbar as expected. like this
frame.setContentPane(scrollPane); //working fineBut When I try adding to panel and try to display that its not working
JPanel panel = new JPanel();
panel.add(scrollPane);
frame.setContentPane(panel); // displaying tree without scrollbarsthanks,
sur

scrollPane.setPreferredSize(new Dimension(x,y));where x,y can be the width/height of the frame

ScrollPane Help

initially i didn't split the panel and data..
the scrollPane was showing good (table - JTable)...
            table = mainPanel.atmBean.getReturnTable();
            //Set Mode, Border, Size
            table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
            table.setBorder(BorderFactory.createEtchedBorder());
            table.setPreferredScrollableViewportSize(mainPanel.getPopupTablePreferredSize());
            //Add table to Scroll Pane
            scrollPane = new JScrollPane(table);
            scrollPane.setPreferredSize(mainPanel.getPopupTablePreferredSize());after splitting the data, i changed like
add()
scrollPane = new JScrollPane();
set()
            table = mainPanel.atmBean.getReturnTable();
            //Set Mode, Border, Size
            table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
            table.setBorder(BorderFactory.createEtchedBorder());
            table.setPreferredScrollableViewportSize(mainPanel.getPopupTablePreferredSize());
            //Add table to Scroll Pane
           //THIS IS THE DIFFERENCE
            scrollPane.add(table);
            scrollPane.validate();
            scrollPane.repaint();
           //c is contentPane()
           c.validate();
           c.repaint();
}the scrollpane doesn't seem to contain the table..

if i add 1 more panel, the problem gets solved, but wondering why shouldn't the scrollPane work ..
ie
add()
JPanel panel = new JPanel();
set()
..all other steps as shown above
scrollPane = new JScrollPane(table)
//one more panel
panel.removeAll();
panel.add(scrollPane);
panel.validate();
panel.repaint();
}

Help for scrollPane

hi
I'm adapting my source code, following the swing tutorial example for scrollbar pane.
I ask you to check my code because I do not see what I want.
my code is intended to put a panel on a scrollpane and then add a textfield to the panel.
the scrollpane is already on my "design" tab (nebeans dev env).
I do not see this.
thanks in advance
testPanel.setEnabled(true);
testPanel.setBackground(Color.black);
testPanel.setVisible(true);
Dimension dimension1=new Dimension(60,60);;
testPanel.setPreferredSize(dimension1);
testPanel.setSize(dimension1);
testPanel.setEnabled(true);
testPanel.setBackground(new java.awt.Color(0, 0, 0));
JTextField testTextField=new JTextField("prova");
testTextField.setEnabled(true);
testTextField.setBackground(new java.awt.Color(0, 102, 153));
testPanel.add(testTextField,new org.netbeans.lib.awtextra.AbsoluteConstraints(272, 51, 316, -1));
JLabel instructionsLeft = new JLabel("Click left mouse button to place a circle.");
jScrollPane1.add(instructionsLeft);
jScrollPane1.add(testPanel,new AbsoluteConstraints(140, 10, -1, -1));
jScrollPane1.setEnabled(true);
testPanel.repaint();
jScrollPane1.repaint();
this.repaint();

P5music wrote:
The only hint in the API document section is to use
jScrollPane1.setViewportView(testPanel);
Now, I used it instead of jScrollPane1.add(testPanel);
but nothing changed....It's very hard to guess what you're doing wrong without compilable code. Unless someone very clever comes by soon who can instantly spot your problme, my recommendation that you create and post an SSCCE still stands. In fact odds are, if you create the SSCCE, you'll spot your error and be able to fix it yourself. Much luck.

Method all values from row

Hi,
Is there a method that get the all the values of a row? I've gone through the java api but didn't found one, but wanted to be sure.
If not I'll have to do getValueAt for every column?
Grtz

Here is one possible implementation using RowTableModel (a self made class).
To access a row, we can use this: Product product = (Product) model.getRow(rowIndex);
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
public class Tabel extends JPanel {
    private JTable table;
    private JTextField filterText;
    private TableRowSorter<MyTableModel> sorter;
    private String output;
    private final MyTableModel model;
    public Tabel() {
        //Create a table with a sorter.
        model = new MyTableModel();
        sorter = new TableRowSorter<MyTableModel>(model);
        table = new JTable(model);
        table.setRowSorter(sorter);
        table.setPreferredScrollableViewportSize(new Dimension(500, 200));
        table.setFillsViewportHeight(true);
        //Single selection
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        //Making sure columns can't be dragged and dropped
        table.getTableHeader().setReorderingAllowed(false);
        //Double click event
        table.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent mouseEvent) {
                if (mouseEvent.getClickCount() == 2) {
                    System.out.print(output);
        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);
        //Add the scroll pane to this panel.
        add(scrollPane);
        JPanel form = new JPanel();
        JLabel l1 = new JLabel("Filter Text:");
        form.add(l1);
        filterText = new JTextField(15);
        //Whenever filterText changes, invoke newFilter.
        filterText.getDocument().addDocumentListener(
                new DocumentListener() {
                    public void changedUpdate(DocumentEvent e) {
                        newFilter();
                    public void insertUpdate(DocumentEvent e) {
                        newFilter();
                    public void removeUpdate(DocumentEvent e) {
                        newFilter();
        l1.setLabelFor(filterText);
        form.add(filterText);
        add(form);
     * Update the row filter regular expression from the expression in
     * the text box.
    private void newFilter() {
        RowFilter<MyTableModel, Object> rf = null;
        //If current expression doesn't parse, don't update.
        try {
            rf = RowFilter.regexFilter("(?i)" + filterText.getText(), 0); //"(?i)" => Zoeken gebeurd case-insensitive
        } catch (java.util.regex.PatternSyntaxException e) {
            return;
        sorter.setRowFilter(rf);
    class MyTableModel extends RowTableModel {
        private final List<Product> mData;
        private final List<String> cNames;
        public MyTableModel() {
            super(Product.class);
            mData = new ArrayList<Product>();
            mData.add(new Product("Frontline Small", 5, 1));
            mData.add(new Product("Frontline Medium", 10, 2));
            mData.add(new Product("Frontline Large", 15, 1));
            mData.add(new Product("Frontline Extra Large", 20, 2));
            mData.add(new Product("Frontline spuitbus", 7.5, 3));
            cNames = new ArrayList<String>();
            cNames.add("Product");
            cNames.add("Prijs");
            cNames.add("Aantal stuks beschikbaar");
            setDataAndColumnNames(mData, cNames);
            setColumnClass(0, String.class);
            setColumnClass(1, Double.class);
            setColumnClass(2, Integer.class);
        public Object getValueAt(final int rowIndex, final int columnIndex) {
            switch (columnIndex) {
                case 0:
                    return mData.get(rowIndex).getDescriction();
                case 1:
                    return mData.get(rowIndex).getPrice();
                case 2:
                    return mData.get(rowIndex).getNumber();
            return null;
        @Override
        public Class getColumnClass(int column) {
            return super.getColumnClass(column);
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Create and set up the content pane.
        Tabel newContentPane = new Tabel();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    public static void main(final String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
class Product {
    private String descriction;
    private double price;
    private int number;
    Product(final String descriction, final double price, final int number) {
        this.descriction = descriction;
        this.price = price;
        this.number = number;
    public String getDescriction() {
        return descriction;
    public void setDescriction(final String descriction) {
        this.descriction = descriction;
    public int getNumber() {
        return number;
    public void setNumber(final int number) {
        this.number = number;
    public double getPrice() {
        return price;
    public void setPrice(final int price) {
        this.price = price;
    @Override
    public String toString() {
        return descriction + ", " + price + ", " + number;
}

Panel in ScrollPane!!!

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