Examples with DataProvider com.vaadin.flow.data.provider.DataProvider used on opensource projects

Example 1 with DataProvider

use of com.vaadin.flow.data.provider.DataProvider in project flow-components by vaadin.

the class LazyLoadingPage method createCallbackDataProvider.

private void createCallbackDataProvider() {
    addTitle("CallbackDataProvider");
    ComboBox<String> comboBox = new ComboBox<>();
    comboBox.setId("callback-dataprovider");
    AtomicInteger sizeRequestCount = new AtomicInteger(0);
    Span sizeRequestCountSpan = new Span("0");
    sizeRequestCountSpan.setId("callback-dataprovider-size-request-count");
    CallbackDataProvider<String, String> dataProvider = new CallbackDataProvider<String, String>(query -> IntStream.range(query.getOffset(), query.getOffset() + query.getLimit()).mapToObj(i -> "Item " + i), query -> {
        sizeRequestCountSpan.setText(String.valueOf(sizeRequestCount.incrementAndGet()));
        return 210;
    });
    comboBox.setDataProvider(dataProvider);
    add(comboBox, sizeRequestCountSpan);
}

Example 2 with DataProvider

use of com.vaadin.flow.data.provider.DataProvider in project flow-components by vaadin.

the class GridUpdateDataProviderPage method createBasicGrid.

private void createBasicGrid() {
    Grid<String> grid = new Grid<>();
    grid.setId("basic-grid");
    DataProvider<String, ?> orig = DataProvider.fromCallbacks(query -> IntStream.range(query.getOffset(), query.getOffset() + query.getLimit()).mapToObj(Integer::toString), query -> 10000);
    DataProvider<String, ?> updated = DataProvider.ofItems("foo", "foob", "fooba", "foobar");
    grid.setDataProvider(orig);
    grid.addColumn(i -> i).setHeader("text");
    grid.addColumn(i -> String.valueOf(i.length())).setHeader("length");
    NativeButton updateProvider = new NativeButton("Use another provider", event -> swapDataProviders(grid, orig, updated));
    updateProvider.setId("update-basic-provider");
    add(new H2("Basic grid"), grid, updateProvider);
}

Example 3 with DataProvider

use of com.vaadin.flow.data.provider.DataProvider in project flow-components by vaadin.

the class RadioButtonGroup method reset.

@SuppressWarnings("unchecked")
private void reset() {
    keyMapper.removeAll();
    clear();
    synchronized (dataProvider) {
        // Cache helper component before removal
        Component helperComponent = getHelperComponent();
        // Remove all known children (doesn't remove client-side-only
        // children such as the label)
        getChildren().forEach(this::remove);
        // reinsert helper component
        setHelperComponent(helperComponent);
        final AtomicInteger itemCounter = new AtomicInteger(0);
        getDataProvider().fetch(DataViewUtils.getQuery(this)).map(item -> createRadioButton((T) item)).forEach(component -> {
            add((Component) component);
            itemCounter.incrementAndGet();
        });
        lastFetchedDataSize = itemCounter.get();
        // so as to avoid multiple beforeClientResponses.
        if (sizeRequest == null) {
            sizeRequest = ui -> {
                fireSizeEvent();
                sizeRequest = null;
            };
            // Size event is fired before client response so as to avoid
            // multiple size change events during server round trips
            runBeforeClientResponse(sizeRequest);
        }
    }
}

Example 4 with DataProvider

use of com.vaadin.flow.data.provider.DataProvider in project flow-components by vaadin.

the class CheckboxGroup method reset.

@SuppressWarnings("unchecked")
private void reset() {
    keyMapper.removeAll();
    clear();
    synchronized (dataProvider) {
        // Cache helper component before removal
        Component helperComponent = getHelperComponent();
        // Remove all known children (doesn't remove client-side-only
        // children such as the label)
        getChildren().forEach(this::remove);
        // reinsert helper component
        // see https://github.com/vaadin/vaadin-checkbox/issues/191
        setHelperComponent(helperComponent);
        final AtomicInteger itemCounter = new AtomicInteger(0);
        getDataProvider().fetch(DataViewUtils.getQuery(this)).map(item -> createCheckBox((T) item)).forEach(component -> {
            add((Component) component);
            itemCounter.incrementAndGet();
        });
        lastFetchedDataSize = itemCounter.get();
        // so as to avoid multiple beforeClientResponses.
        if (sizeRequest == null) {
            sizeRequest = ui -> {
                fireSizeEvent();
                sizeRequest = null;
            };
            // Size event is fired before client response so as to avoid
            // multiple size change events during server round trips
            runBeforeClientResponse(sizeRequest);
        }
    }
}

Example 5 with DataProvider

use of com.vaadin.flow.data.provider.DataProvider in project flow-components by vaadin.

the class IronListView method createDisabledStringsList.

private void createDisabledStringsList() {
    IronList<String> list = new IronList<>();
    list.setHeight("400px");
    list.getStyle().set("border", "1px solid lightgray");
    Div removalResult = new Div();
    removalResult.setId("disabled-removal-result");
    DataProvider<String, ?> dataProvider = DataProvider.fromCallbacks(query -> queryStringsFromDatabase(query), query -> countStringsFromDatabase(query));
    list.setDataProvider(dataProvider);
    // Disable the list so that scrolling still works but events are not
    // handled
    list.setEnabled(false);
    /*
         * The name of the event handlers defined at 'on-click' are used inside
         * the 'withEventHandler' calls.
         */
    list.setRenderer(TemplateRenderer.<String>of("<div style='display:flex; justify-content:space-between; padding:10px;'>" + "<div style='flex-grow:1'>[[item.name]]</div>" + "<div><button on-click='remove' style='color:red'>X</button></div>" + "<div>").withProperty("name", ValueProvider.identity()).withEventHandler("remove", item -> {
        removalResult.setText(item);
    }));
    NativeButton switchEnabled = new NativeButton("Switch enabled state", event -> list.setEnabled(!list.isEnabled()));
    list.setId("disabled-list-with-templates");
    switchEnabled.setId("switch-enabled-state-string-list");
    addCard("Using templates", "Using disabled list with templates", new Label("Rank up/down your favorite Lord of the Rings characters"), list, removalResult, switchEnabled);
}