Java SWT - Create a pure SWT Table with different color on even and odd rows - swt

Question

I am very new to the SWT and I am trying to create a Java SWT table with different color on even and odd rows (ex: 1st row is red, second row is blue, third row is res, fourth row is blue ... ).
Since the rows on table can be deleted, inserted so if I manually set color by using a for loop I will have to run that loop again and again to set color every time there's something change in the table. And I don't want to use JFace, just pure Java SWT
Do you have some better solutions for this problems?

Answer 1

You can use custom drawn table items .
By adding a listener for the SWT.EraseItem you can just draw the background and let the rest do the default implementation. Use the item field of the event to decide whether an even or odd row is to be drawn.
For example:
table.addListener( SWT.EraseItem, new Listener() {
#Override
public void handleEvent( Event event ) {
int index = table.indexOf( ( TableItem )event.item );
if( index % 2 == 0 ) {
Color oldBackground = event.gc.getBackground();
event.gc.setBackground( event.display.getSystemColor( SWT.COLOR_DARK_YELLOW ) );
event.gc.fillRectangle( 0, event.y, table.getClientArea().width, event.height );
event.gc.setBackground( oldBackground );
}
}
} );