Description

ListGrid displays a list of objects in a grid, where each row represents one object and each cell in the row represents one property.

Periodical updating ListGrid is possible in the following ways:

Transparent update

For transparent loading the data should be used fetchData method.

private void updateAll() {
    DataSource dataSource = listGrid.getDataSource();
    Criteria criteria = listGrid.getCriteria();
    dataSource.fetchData(criteria, createUpdateAllCallback());
}

private DSCallback createUpdateCallback() {
    return new DSCallback() {
        @Override
        public void execute(DSResponse response, Object rawData, DSRequest request) {
            DataSource dataSource = listGrid.getDataSource();

            ResultSet resultSet = new ResultSet(dataSource);
            resultSet.setInitialLength(response.getTotalRows());
            resultSet.setInitialData(response.getData());

            listGrid.setData(resultSet);
        }
    };
}

Transparent update range

For transparent loading the data range should be used DSRequest. It allows you to specify a range of data to load.

private void updateRange() {
    DataSource dataSource = listGrid.getDataSource();
    Criteria criteria = listGrid.getCriteria();

    Integer[] visibleRows = listGrid.getVisibleRows();
    Integer startRow = 0;
    Integer endRow = (visibleRows[1] + listGrid.getResultSet().getResultSize());

    DSRequest request = new DSRequest();
    request.setStartRow(startRow);
    request.setEndRow(endRow);

    dataSource.fetchData(criteria, createUpdateCallback(), request);
}

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