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For transparent loading of the data the fetchData method should be used.
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private void onRefresh() { DataSource dataSource = listGrid.getDataSource(); Criteria criteria = listGrid.getCriteria(); Integer[] visibleRows = listGrid.getVisibleRows(); // request one page's worth of data on either side of the current viewport Integer startRow = visibleRows[0] - listGrid.getResultSet().getResultSize(); Integer endRow = visibleRows[1] + listGrid.getResultSet().getResultSize(); if (startRow < 0) { startRow = 0; } DSRequest request = new DSRequest(); request.setStartRow(startRow); request.setEndRow(endRow); request.setSortBy(listGrid.getSort()); dataSource.fetchData(criteria, new DSCallback() { @Override public void execute(DSResponse response, Object rawData, DSRequest request) { onRefreshed(response); } }, request); } private void onRefreshed(DSResponse response) { DataSource dataSource = listGrid.getDataSource(); ResultSet resultSet = new ResultSet(dataSource); resultSet.setInitialLength(response.getTotalRows()); // correctly position the result in the resultset's cache Record[] result = response.getData(); Record[] initialData = new Record[response.getTotalRows()]; System.arraycopy(result, 0, initialData, response.getStartRow(), result.length); resultSet.setInitialData(initialData); resultSet.setInitialSort(listGrid.getSort()); resultSet.setCriteria(listGrid.getCriteria()); listGrid.setData(resultSet); } |
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