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package com.vaadin.tests.widgetset.client.grid;
import java.util.Arrays;
import java.util.List;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.RepeatingCommand;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.SimplePanel;
import com.vaadin.client.data.AbstractRemoteDataSource;
import com.vaadin.client.widget.grid.datasources.ListDataSource;
import com.vaadin.client.widgets.Grid;
public class GridDataChangeHandlerWidget extends Composite {
private final SimplePanel panel = new SimplePanel();
private final Grid<String> grid = new Grid<>();
public static class DelayedDataSource extends ListDataSource<String> {
public DelayedDataSource(List<String> datasource) {
super(datasource);
}
@Override
public void ensureAvailability(final int firstRowIndex,
final int numberOfRows) {
new Timer() {
@Override
public void run() {
actualEnsureAvailability(firstRowIndex, numberOfRows);
}
}.schedule(500);
}
private void actualEnsureAvailability(int firstRowIndex,
int numberOfRows) {
super.ensureAvailability(firstRowIndex, numberOfRows);
}
}
public static class RemoteDelayedDataSource
extends AbstractRemoteDataSource<String> {
private List<String> rows;
public RemoteDelayedDataSource(List<String> datasource) {
super();
rows = datasource;
// Make Grid request not exceed actual size.
resetDataAndSize(rows.size());
}
@Override
protected void requestRows(final int firstRowIndex,
final int numberOfRows,
final RequestRowsCallback<String> callback) {
new Timer() {
@Override
public void run() {
List<String> requested = rows.subList(firstRowIndex,
numberOfRows);
callback.onResponse(requested, requested.size());
}
}.schedule(500);
}
@Override
public Object getRowKey(String row) {
return row;
}
}
public GridDataChangeHandlerWidget() {
initWidget(panel);
panel.setWidget(grid);
grid.setDataSource(new RemoteDelayedDataSource(
Arrays.asList("A", "B", "C", "D", "E")));
grid.addColumn(new Grid.Column<String, String>("letter") {
@Override
public String getValue(String row) {
return row;
}
});
Scheduler.get().scheduleFinally(new RepeatingCommand() {
boolean run = false;
@Override
public boolean execute() {
grid.setDataSource(
new DelayedDataSource(Arrays.asList("X", "Y", "Z")));
if (run) {
return false;
}
run = true;
return true;
}
});
}
}
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