jika anda bekerja dengan jtabel ada kalanya anda ingin menambahkan nomor pada jtabel anda tenyata ada cara yang cukup mudah yaitu dengan membuat sebuah class row number yang berfungsi untuk menambahkan row pada jscrollpanel kita :
- buat class baru dengan nama RowNumberTable.java
- kemudian isi dengan baris berikut
- kemudian cara menggunakan nya adalah dengan memangil class tersebut
package lib;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
/*
* Use a JTable as a renderer for row numbers of a given main table.
* This table must be added to the row header of the scrollpane that
* contains the main table.
*/
public class RowNumberTable extends JTable
implements ChangeListener, PropertyChangeListener, TableModelListener {
private JTable main;
public RowNumberTable(JTable table) {
main = table;
main.addPropertyChangeListener( this );
main.getModel().addTableModelListener( this );
setFocusable( false );
setAutoCreateColumnsFromModel( false );
setSelectionModel( main.getSelectionModel() );
TableColumn column = new TableColumn();
column.setHeaderValue(" ");
addColumn( column );
column.setCellRenderer(new RowNumberRenderer());
getColumnModel().getColumn(0).setPreferredWidth(50);
setPreferredScrollableViewportSize(getPreferredSize());
}
@Override
public void addNotify(){
super.addNotify();
Component c = getParent();
// Keep scrolling of the row table in sync with the main table.
if (c instanceof JViewport){
JViewport viewport = (JViewport)c;
viewport.addChangeListener( this );
}
}
/*
* Delegate method to main table
*/
@Override
public int getRowCount(){
return main.getRowCount();
}
@Override
public int getRowHeight(int row){
int rowHeight = main.getRowHeight(row);
if (rowHeight != super.getRowHeight(row)){
super.setRowHeight(row, rowHeight);
}
return rowHeight;
}
/*
* No model is being used for this table so just use the row number
* as the value of the cell.
*/
@Override
public Object getValueAt(int row, int column){
return Integer.toString(row + 1);
}
/*
* Don't edit data in the main TableModel by mistake
*/
@Override
public boolean isCellEditable(int row, int column){
return false;
}
/*
* Do nothing since the table ignores the model
*/
@Override
public void setValueAt(Object value, int row, int column) {}
//
// Implement the ChangeListener
//
public void stateChanged(ChangeEvent e){
// Keep the scrolling of the row table in sync with main table
JViewport viewport = (JViewport) e.getSource();
JScrollPane scrollPane = (JScrollPane)viewport.getParent();
scrollPane.getVerticalScrollBar().setValue(viewport.getViewPosition().y);
}
//
// Implement the PropertyChangeListener
//
public void propertyChange(PropertyChangeEvent e)
{
// Keep the row table in sync with the main table
if ("selectionModel".equals(e.getPropertyName())){
setSelectionModel( main.getSelectionModel() );
}
if ("rowHeight".equals(e.getPropertyName())){
repaint();
}
if ("model".equals(e.getPropertyName())){
main.getModel().addTableModelListener( this );
revalidate();
}
}
//
// Implement the TableModelListener
//
@Override
public void tableChanged(TableModelEvent e){
revalidate();
}
/*
* Attempt to mimic the table header renderer
*/
private static class RowNumberRenderer extends DefaultTableCellRenderer{
public RowNumberRenderer(){
setHorizontalAlignment(JLabel.CENTER);
}
public Component getTableCellRendererComponent(
JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column){
if (table != null){
JTableHeader header = table.getTableHeader();
if (header != null){
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
}
}
if (isSelected){
setFont( getFont().deriveFont(Font.BOLD) );
}
setText((value == null) ? "" : value.toString());
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
return this;
}
}
}
JTable rownomber = new RowNumberTable(jTable);
jScrollPane1.setRowHeaderView(rownomber);
jScrollPane1.setRowHeaderView(rownomber);
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