本文整理了Java中com.vaadin.ui.Grid.getDataProvider()方法的一些代码示例，展示了Grid.getDataProvider()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Grid.getDataProvider()方法的具体详情如下：
包路径：com.vaadin.ui.Grid
类名称：Grid
方法名：getDataProvider

Grid.getDataProvider介绍

暂无

代码示例

代码示例来源：origin: com.vaadin/vaadin-server

@Override
public HierarchicalDataProvider<T, ?> getDataProvider() {
  if (!(super.getDataProvider() instanceof HierarchicalDataProvider)) {
    return null;
  }
  return (HierarchicalDataProvider<T, ?>) super.getDataProvider();
}

代码示例来源：origin: com.vaadin/vaadin-server

/**
 * Returns if the given id belongs to one of the selected items.
 *
 * @param id
 *            the id to check for
 * @return {@code true} if id is selected, {@code false} if not
 */
protected boolean selectionContainsId(Object id) {
  DataProvider<T, ?> dataProvider = getGrid().getDataProvider();
  return selection.stream().map(dataProvider::getId)
      .anyMatch(i -> id.equals(i));
}

代码示例来源：origin: com.vaadin/vaadin-server

@Override
  public void refreshData(T item) {
    DataProvider<T, ?> dataProvider = getGrid().getDataProvider();
    Object refreshId = dataProvider.getId(item);
    for (int i = 0; i < selection.size(); ++i) {
      if (dataProvider.getId(selection.get(i)).equals(refreshId)) {
        selection.set(i, item);
        return;
      }
    }
  }
}

代码示例来源：origin: com.vaadin/vaadin-server

@Override
  public boolean isSelected(T item) {
    // Quick comparison of objects directly
    if (Objects.equals(item, selectedItem)) {
      return true;
    }

    // Id based check
    return item != null && selectedItem != null
        && getGrid().getDataProvider().getId(selectedItem)
            .equals(getGrid().getDataProvider().getId(item));
  }
}

代码示例来源：origin: com.vaadin/vaadin-server

private DataProvider<T, ?> getSourceDataProvider() {
  return getGridDragSource().getGrid().getDataProvider();
}

代码示例来源：origin: com.vaadin/vaadin-server

@Override
public void destroyData(T item) {
  removeComponent(getGrid().getDataProvider().getId(item));
}

代码示例来源：origin: com.vaadin/vaadin-server

private DataProvider<T, ?> getTargetDataProvider() {
  return getGridDropTarget().getGrid().getDataProvider();
}

代码示例来源：origin: com.vaadin/vaadin-server

private void updateSortable() {
  boolean inMemory = getGrid().getDataProvider().isInMemory();
  boolean hasSortOrder = getSortOrder(SortDirection.ASCENDING)
      .count() != 0;
  getState().sortable = this.sortable && (inMemory || hasSortOrder);
}

代码示例来源：origin: com.vaadin/vaadin-server

/**
 * Writes the data contained in this grid. Used when serializing a grid to
 * its declarative representation, if
 * {@link DesignContext#shouldWriteData(Component)} returns {@code true} for
 * the grid that is being written.
 *
 * @since 8.1
 *
 * @param body
 *            the body element to write the declarative representation of
 *            data to
 * @param designContext
 *            the design context
 *
 * @since 8.1
 */
protected void writeData(Element body, DesignContext designContext) {
  getDataProvider().fetch(new Query<>())
      .forEach(item -> writeRow(body, item, designContext));
}

代码示例来源：origin: com.vaadin/vaadin-server

DataProvider<T, ?> dataProvider = getGrid().getDataProvider();

代码示例来源：origin: com.vaadin/vaadin-server

@Override
public boolean isSelected(T item) {
  return isAllSelected()
      || selectionContainsId(getGrid().getDataProvider().getId(item));
}

代码示例来源：origin: com.vaadin/vaadin-server

private void handleTargetGridDrop(GridDropEvent<T> event, final int index,
    Collection<T> droppedItems) {
  Grid<T> target = getGridDropTarget().getGrid();
  if (getTargetDataProviderUpdater() != null) {
    getTargetDataProviderUpdater().onDrop(event.getDropEffect(),
        target.getDataProvider(), index, droppedItems);
    return;
  }
  ListDataProvider<T> listDataProvider = (ListDataProvider<T>) target
      .getDataProvider();
  // update the existing to keep filters etc.
  List<T> targetItems = (List<T>) listDataProvider.getItems();
  if (index != Integer.MAX_VALUE) {
    targetItems.addAll(index, droppedItems);
  } else {
    targetItems.addAll(droppedItems);
  }
  // instead of using setItems or creating a new data provider,
  // refresh the existing one to keep filters etc. in place
  listDataProvider.refreshAll();
  // if dropped to the end of the grid, the grid should scroll there so
  // that the dropped row is visible, but that is just recommended in
  // documentation and left for the users to take into use
}

代码示例来源：origin: com.vaadin/vaadin-server

private int calculateDropIndex(GridDropEvent<T> event) {
  // use custom calculator if present
  if (getDropIndexCalculator() != null) {
    return getDropIndexCalculator().calculateDropIndex(event);
  }
  // if the source and target grids are the same, then the index has been
  // calculated before removing the items. In this case the drop location
  // is always above, since the items will be starting from that point on
  if (shiftedDropIndex != -1) {
    return shiftedDropIndex;
  }
  ListDataProvider<T> targetDataProvider = (ListDataProvider<T>) getGridDropTarget()
      .getGrid().getDataProvider();
  List<T> items = (List<T>) targetDataProvider.getItems();
  int index = items.size();
  Optional<T> dropTargetRow = event.getDropTargetRow();
  if (dropTargetRow.isPresent()) {
    index = items.indexOf(dropTargetRow.get())
        + (event.getDropLocation() == DropLocation.BELOW ? 1 : 0);
  }
  return index;
}

代码示例来源：origin: com.vaadin/vaadin-server

private void handleSourceGridDrop(GridDropEvent<T> event,
    final Collection<T> droppedItems) {
  Grid<T> source = getGridDragSource().getGrid();
  if (getSourceDataProviderUpdater() != null) {
    getSourceDataProviderUpdater().removeItems(event.getDropEffect(),
        source.getDataProvider(), droppedItems);
    return;
  }
  ListDataProvider<T> listDataProvider = (ListDataProvider<T>) source
      .getDataProvider();
  // use the existing data source to keep filters and sort orders etc. in
  // place.
  Collection<T> sourceItems = listDataProvider.getItems();
  // if reordering the same grid and dropping on top of one of the dragged
  // rows, need to calculate the new drop index before removing the items
  if (getGridDragSource().getGrid() == getGridDropTarget().getGrid()
      && event.getDropTargetRow().isPresent()
      && getDraggedItems().contains(event.getDropTargetRow().get())) {
    List<T> sourceItemsList = (List<T>) sourceItems;
    shiftedDropIndex = sourceItemsList
        .indexOf(event.getDropTargetRow().get());
    shiftedDropIndex -= getDraggedItems().stream().filter(
        item -> sourceItemsList.indexOf(item) < shiftedDropIndex)
        .count();
  }
  sourceItems.removeAll(droppedItems);
  listDataProvider.refreshAll();
}

代码示例来源：origin: com.vaadin/vaadin-server

@SuppressWarnings("unchecked")
private <P> JsonValue generateRendererValue(T item,
    ValueProvider<V, P> presentationProvider, Connector renderer) {
  P presentationValue = presentationProvider
      .apply(valueProvider.apply(item));
  // Make Grid track components.
  if (renderer instanceof ComponentRenderer
      && presentationValue instanceof Component) {
    addComponent(getGrid().getDataProvider().getId(item),
        (Component) presentationValue);
  }
  return ((Renderer<P>) renderer).encode(presentationValue);
}

代码示例来源：origin: com.vaadin/vaadin-server

/**
 * Controls whether the select all checkbox is visible in the grid default
 * header, or not.
 * <p>
 * This is updated as a part of {@link #beforeClientResponse(boolean)},
 * since the data provider for grid can be changed on the fly.
 *
 * @see SelectAllCheckBoxVisibility
 */
protected void updateCanSelectAll() {
  switch (selectAllCheckBoxVisibility) {
  case VISIBLE:
    getState(false).selectAllCheckBoxVisible = true;
    break;
  case HIDDEN:
    getState(false).selectAllCheckBoxVisible = false;
    break;
  case DEFAULT:
    getState(false).selectAllCheckBoxVisible = getGrid()
        .getDataProvider().isInMemory();
    break;
  default:
    break;
  }
}

代码示例来源：origin: com.vaadin/vaadin-server

/**
 * Triggered when the user checks the select all checkbox.
 *
 * @param userOriginated
 *            {@code true} if originated from client side by user
 */
protected void onSelectAll(boolean userOriginated) {
  if (userOriginated) {
    verifyUserCanSelectAll();
    // all selected state has been updated in client side already
    getState(false).allSelected = true;
    getUI().getConnectorTracker().getDiffState(this).put("allSelected",
        true);
  } else {
    getState().allSelected = true;
  }
  Stream<T> allItemsStream;
  DataProvider<T, ?> dataProvider = getGrid().getDataProvider();
  // this will fetch everything from backend
  if (dataProvider instanceof HierarchicalDataProvider) {
    allItemsStream = fetchAllHierarchical(
        (HierarchicalDataProvider<T, ?>) dataProvider);
  } else {
    allItemsStream = fetchAll(dataProvider);
  }
  LinkedHashSet<T> allItems = new LinkedHashSet<>();
  allItemsStream.forEach(allItems::add);
  updateSelection(allItems, Collections.emptySet(), userOriginated);
}

代码示例来源：origin: com.holon-platform.vaadin/holon-vaadin

@Override
public void refresh() {
  if (isBuffered()) {
    requireDataSource().refresh();
  }
  getGrid().getDataProvider().refreshAll();
}

代码示例来源：origin: com.holon-platform.vaadin/holon-vaadin

@Override
public void refreshItem(T item) {
  ObjectUtils.argumentNotNull(item, "Item must be not null");
  if (isBuffered()) {
    requireDataSource().refresh(item);
  }
  getGrid().getDataProvider().refreshItem(item);
}

代码示例来源：origin: jpos/jPOS-EE

/**
 * Refreshes the grid when a search parameter changes
 */
private void refreshGrid() {
  DateRange range = dateRangeComponent.getValue();
  Journal selectedJournal = journals.getValue();
  ((TransactionsHelper) getHelper()).setDefaultJournalId(selectedJournal.getId());
  ConfigurableFilterDataProvider wrapper = (ConfigurableFilterDataProvider) getGrid().getDataProvider();
  wrapper.setFilter(range);
  wrapper.refreshAll();
}