CODEWITHSUNDEEP
javaswingjtablejscrollpane
Shivam Paw
Shivam Paw

Reputation: 203

Java Swing Making JTable Columns fill JScrollPane

I have made a GUI JTable which displays a database. I have one problem with sizing.

How can I make it so that the columns of the JTable will fill the JScrollPane but if there are a lot of columns in one table for example then it would just keep them default size and let them scroll.

Basically..

If one of the SQL tables don't fill the JTable and don't need scrolling then I want the columns of that JTable to be made bigger so they do fit.

If the SQL JTable does need scrolling then I just want it to be left like that so it needs scrolling.

This is the code I have for making the JTable:

        JPanel panel1 = new JPanel();
        JTable table = new JTable(){
        private static final long serialVersionUID = 1L;

            @Override
                public boolean isCellEditable(int row, int column) {
                   return false;
                }

        };
        JScrollPane stable = new JScrollPane (table);
        stable.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
        stable.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        panel1.add(stable);

Upvotes: 1

Views: 1941

Answers (3)

Santhosh Kumar Tekuri
Santhosh Kumar Tekuri

Reputation: 3020

To get exactly what you asked for call following method after table is updated with new model:

public static void tweakColumns(JTable table){
    Enumeration<TableColumn> columns = table.getColumnModel().getColumns();

    int required = 0;
    while(columns.hasMoreElements()){
        TableColumn column = columns.nextElement();
        int width = (int)table.getTableHeader().getDefaultRenderer()
                    .getTableCellRendererComponent(table, column.getIdentifier()
                            , false, false, -1, column.getModelIndex()).getPreferredSize().getWidth();
        required += width;
    }

    JViewport viewport = (JViewport)SwingUtilities.getAncestorOfClass(JViewport.class, table);
    int viewportWidth = viewport.getWidth();
    table.setAutoResizeMode(required<viewportWidth ? JTable.AUTO_RESIZE_ALL_COLUMNS : JTable.AUTO_RESIZE_OFF);
}

Upvotes: 2

Santhosh Kumar Tekuri
Santhosh Kumar Tekuri

Reputation: 3020

comment following line in your code:

table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);

this makes table columns stretch to fill scrollpane's width

stretching columns to fit entire width of table makes it look ugly. instead i suggest to add following features to your table.

http://www.jroller.com/santhosh/entry/jtable_becomes_uglier_with_auto http://www.jroller.com/santhosh/entry/packing_jtable_columns

this makes your jtable look more professional

Upvotes: 2

A.K.
A.K.

Reputation: 2322

import java.awt.Dimension;
import java.awt.Font;
import javax.swing.table.*;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class StatusPage extends JPanel
{
    static DefaultTableModel dm;
    JTable table;
    JScrollPane jsp_table;
    static Connection conn;
    static Statement stmt;
    static ResultSet rs;

    public StatusPage(Connection c)
    {
        conn = c;
        String col_name[] = {"S.No.","Book Name","Author Name","ISBN","Available Book","Issue Book","Total Book"};
        dm = new DefaultTableModel(null,col_name);
        table = new JTable(dm);
        table.getTableHeader().setFont( new Font( "Goudy Old Style" , Font.BOLD, 15 ));
                table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
                table.getColumnModel().getColumn(0).setPreferredWidth(50);
                table.getColumnModel().getColumn(1).setPreferredWidth(175);
                table.getColumnModel().getColumn(2).setPreferredWidth(175);
                table.getColumnModel().getColumn(3).setPreferredWidth(125);
                table.getColumnModel().getColumn(4).setPreferredWidth(111);
                table.getColumnModel().getColumn(5).setPreferredWidth(90);
                table.getColumnModel().getColumn(6).setPreferredWidth(90);
        jsp_table = new JScrollPane(table);
        jsp_table.setPreferredSize(new Dimension(850, 520));
        addRowTable();
        add(jsp_table);
    }
    public static void addRowTable()
    {
        try
        {
                    int a = dm.getRowCount();
            int i=0;
            while(i<a)
            {
                dm.removeRow(0);
                i++;
            }

            stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
            rs = stmt.executeQuery("SELECT * FROM BOOK_TABLE");

            int count = 1;
            while(rs.next())
            {
                String s[] = new String[7];

                s[0] = ""+count;
                s[1] = rs.getString(6);
                s[2] = rs.getString(1);
                s[3] = rs.getString(2);
                s[4] = ""+rs.getInt(4);
                s[5] = ""+rs.getInt(5);
                s[6] = ""+rs.getInt(3);

                count++;

                dm.addRow(s);
            }
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
    }
}

Read this code and change your code Because this code work

Upvotes: 0

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