在SWT小部件表中动态填充大量数据

Question

I want to populate huge data in SWT Table. After searching the internet, I found the below code. But this code populates the hardcode data.

public static void main( String[] args ) {
    Display display = new Display();
    Shell shell = new Shell( display );
    shell.setLayout( new FillLayout() );
    final Table table = new Table( shell, SWT.VIRTUAL );
    table.setItemCount( 10000 );
    table.addListener( SWT.SetData, new Listener() {
      public void handleEvent( Event event ) {
        TableItem item = (TableItem)event.item;
        item.setText("Item" + table.indexOf( item ) ); // should be replaced 
        // by below for loop
     }
    } );
    shell.setSize( 300, 500 );
    shell.open();
    while( !shell.isDisposed() ) {
       if( !display.readAndDispatch() ) {
          display.sleep();
       }
    }
    display.dispose();
}

I want to populate something like below inside the table.addListener handle event. Please help me in this. Thanks in advance!

 for (int i = 0; i < informationList.size(); i++) {
        TableItem item = new TableItem(informationTable, SWT.CENTER);
        item.setText(1, informationList.get(i).getName());
        item.setText(2, "");
        item.setText(3, "");
        item.setText(4, ""+informationList.get(i).getId());

 }

Answer 1

A virtual table asks via the listener for the contents of the currently visible rows. That's what the virtual table is all about: "Don't call us, we'll call you!"

table.addListener(SWT.SetData, new Listener() {
    public void handleEvent( Event event ) {
        TableItem item = (TableItem)event.item;
        int index = table.indexOf(item);
        item.setText(1, informationList.get(index).getName());
        item.setText(2, "");
        item.setText(3, "");
        item.setText(4, "" + informationList.get(index).getId());
    }
});

See also Javadoc of the Table widget which also contains an example (highlighting by me):

Style VIRTUAL is used to create a Table whose TableItems are to be populated by the client on an on-demand basis instead of up-front. This can provide significant performance improvements for tables that are very large or for which TableItem population is expensive (for example, retrieving values from an external source).

Here is an example of using a Table with style VIRTUAL :

...

Answer 2

I achieved it by implementing it like

    final String [] names = new String [informationList.size()];
    final int [] ids = new int [informationList.size()];
    table.setItemCount(informationList);
    for (int i = 0; i < informationList.size(); i++) {
        names [i] = informationList.get(i).getName();
    }
    for (int i = 0; i < informationList.size(); i++) {
        ids [i] = informationList.get(i).getId();
    }

    table.addListener(SWT.SetData, new Listener() {
        public void handleEvent(Event event) {
            TableItem item = (TableItem)event.item;
            int index = event.index;
            item.setText(1, names [index]);
            item.setText(2, "");
            item.setText(3, "");
            item.setText(4, ""+ids [index]);
        }
    });