Window with a slider

Question

I am trying to create a panel within an application that is set in size and contains a grid with fixed number of cells in each row, but a variable number of rows. What class can I use to get a slider to keep it in the panel?

Answer 1

You need to set the prefered size of a JSrollPane and drop into it a JTable. Sunone / forte makes this job resonably easy. Next you need to overide the "public int getRowCount()" method of an AbstractTableModel and set this model within your JTable using the command "setModel(new myTableModel());"
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import javax.swing.table.AbstractTableModel;
* Grid.java
* Created on 31 October 2003, 13:21
public class Grid extends JPanel{
    /** Creates a new instance of Grid */
    public Grid() {
        JTable      jTable      = new JTable();
        JScrollPane jScrollPane = new JScrollPane();
        AbstractTableModel myTableModel = new MyTableModel();
        setLayout(new java.awt.BorderLayout());
        addComponentListener(new java.awt.event.ComponentAdapter() {
            public void componentShown(java.awt.event.ComponentEvent evt) {
        jScrollPane.setPreferredSize(new java.awt.Dimension(850, 450));
        add(jScrollPane, java.awt.BorderLayout.CENTER);
        jTable.setModel(myTableModel);
        jTable.setAutoResizeMode(javax.swing.JTable.AUTO_RESIZE_OFF);
        jTable.setRowSelectionAllowed(false);
        jTable.setShowHorizontalLines(false);
        jTable.getTableHeader().setReorderingAllowed(false);
        jTable.setRowHeight(18);
        jTable.setRowMargin(0);
        jTable.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
        jScrollPane.setPreferredSize(new java.awt.Dimension(850, 450));
        jScrollPane.setViewportView(jTable);
}Code for the table model...
import javax.swing.table.AbstractTableModel;
* MyTableModel.java
* Created on 31 October 2003, 13:52
public class MyTableModel extends  AbstractTableModel{
    /** Creates a new instance of MyTableModel */
    public MyTableModel() {
    public int getRowCount() {
        return 5;
        //return myRowCounter;
    public int getColumnCount() {
        return 6;
        //return myColumnCounter;
    /** Returns the value for the cell at <code>columnIndex</code> and
     * <code>rowIndex</code>.
     * @param     rowIndex     the row whose value is to be queried
     * @param     columnIndex      the column whose value is to be queried
     * @return     the value Object at the specified cell
    public Object getValueAt(int rowIndex, int columnIndex) {
        return "Cell contents";
}I draw you attention to the document accessable from link at
http://java.sun.com/j2se/1.4.2/docs/api/
Titled "How to use tables". I don't believe that everything in this document is clear, but it is a good starting place. Essentially, I used it in combination with this forum to work out the answers to your questions only a matter of months ago.
I have only tested the above code for compilation. But I have no reason to think that it does not work.
David.