com.google.gwt.user.cellview.client

## Class DataGrid<T>

- java.lang.Object
- - com.google.gwt.user.client.ui.UIObject
  - - com.google.gwt.user.client.ui.Widget
    - - com.google.gwt.user.client.ui.Composite
      - - com.google.gwt.user.cellview.client.AbstractHasData<T>
        - - com.google.gwt.user.cellview.client.AbstractCellTable<T>
          - - com.google.gwt.user.cellview.client.DataGrid<T>

Type Parameters:
  `T` - the data type of each row

All Implemented Interfaces:
  HasAttachHandlers, HasHandlers, HasKeyboardPagingPolicy, HasKeyboardSelectionPolicy, EventListener, Focusable, HasVisibility, IsRenderable, IsWidget, RequiresResize, HasCellPreviewHandlers<T>, HasData<T>, HasKeyProvider<T>, HasRows

    public class DataGrid<T>
    extends AbstractCellTable<T>
    implements RequiresResize

A tabular view with a fixed header and footer section and a scrollable data section in the middle. This widget supports paging and columns.

### Columns

The `Column` class defines the `Cell` used to render a column. Implement `Column.getValue(Object)` to retrieve the field value from the row object that will be rendered in the `Cell`.

### Headers and Footers

A `Header` can be placed at the top (header) or bottom (footer) of the `DataGrid`. You can specify a header as text using `AbstractCellTable.addColumn(Column, String)`, or you can create a custom `Header` that can change with the value of the cells, such as a column total. The `Header` will be rendered every time the row data changes or the table is redrawn. If you pass the same header instance (==) into adjacent columns, the header will span the columns.

### Examples

Trivial example

  >     public class CellTableExample implements EntryPoint {

  >       /**
  >        * A simple data type that represents a contact.
  >        */
  >       private static class Contact {
  >         private final String address;
  >         private final Date birthday;
  >         private final String name;

  >         public Contact(String name, Date birthday, String address) {
  >           this.name = name;
  >           this.birthday = birthday;
  >           this.address = address;
  >         }
  >       }

  >       /**
  >        * The list of data to display.
  >        */
  >       private static final List<Contact> CONTACTS = Arrays.asList(
  >           new Contact("John", new Date(80, 4, 12), "123 Fourth Avenue"),
  >           new Contact("Joe", new Date(85, 2, 22), "22 Lance Ln"),
  >           new Contact("George", new Date(46, 6, 6), "1600 Pennsylvania Avenue"));

  >       public void onModuleLoad() {
  >         // Create a CellTable.
  >         CellTable<Contact> table = new CellTable<Contact>();
  >         table.setKeyboardSelectionPolicy(KeyboardSelectionPolicy.ENABLED);

  >         // Add a text column to show the name.
  >         TextColumn<Contact> nameColumn = new TextColumn<Contact>() {
  >           @Override
  >           public String getValue(Contact object) {
  >             return object.name;
  >           }
  >         };
  >         table.addColumn(nameColumn, "Name");

  >         // Add a date column to show the birthday.
  >         DateCell dateCell = new DateCell();
  >         Column<Contact, Date> dateColumn = new Column<Contact, Date>(dateCell) {
  >           @Override
  >           public Date getValue(Contact object) {
  >             return object.birthday;
  >           }
  >         };
  >         table.addColumn(dateColumn, "Birthday");

  >         // Add a text column to show the address.
  >         TextColumn<Contact> addressColumn = new TextColumn<Contact>() {
  >           @Override
  >           public String getValue(Contact object) {
  >             return object.address;
  >           }
  >         };
  >         table.addColumn(addressColumn, "Address");

  >         // Add a selection model to handle user selection.
  >         final SingleSelectionModel<Contact> selectionModel = new SingleSelectionModel<Contact>();
  >         table.setSelectionModel(selectionModel);
  >         selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
  >           public void onSelectionChange(SelectionChangeEvent event) {
  >             Contact selected = selectionModel.getSelectedObject();
  >             if (selected != null) {
  >               Window.alert("You selected: " + selected.name);
  >             }
  >           }
  >         });

  >         // Set the total row count. This isn't strictly necessary, but it affects
  >         // paging calculations, so its good habit to keep the row count up to date.
  >         table.setRowCount(CONTACTS.size(), true);

  >         // Push the data into the widget.
  >         table.setRowData(0, CONTACTS);

  >         // Add it to the root panel.
  >         RootPanel.get().add(table);
  >       }
  >     }

FieldUpdater example

  >     public class CellTableFieldUpdaterExample implements EntryPoint {

  >       /**
  >        * A simple data type that represents a contact with a unique ID.
  >        */
  >       private static class Contact {
  >         private static int nextId = 0;

  >         private final int id;
  >         private String name;

  >         public Contact(String name) {
  >           nextId++;
  >           this.id = nextId;
  >           this.name = name;
  >         }
  >       }

  >       /**
  >        * The list of data to display.
  >        */
  >       private static final List<Contact> CONTACTS = Arrays.asList(new Contact("John"), new Contact(
  >           "Joe"), new Contact("George"));

  >       /**
  >        * The key provider that allows us to identify Contacts even if a field
  >        * changes. We identify contacts by their unique ID.
  >        */
  >       private static final ProvidesKey<Contact> KEY_PROVIDER =
  >           new ProvidesKey<CellTableFieldUpdaterExample.Contact>() {
  >             @Override
  >             public Object getKey(Contact item) {
  >               return item.id;
  >             }
  >           };

  >       @Override
  >       public void onModuleLoad() {
  >         // Create a CellTable with a key provider.
  >         final CellTable<Contact> table = new CellTable<Contact>(KEY_PROVIDER);

  >         // Add a text input column to edit the name.
  >         final TextInputCell nameCell = new TextInputCell();
  >         Column<Contact, String> nameColumn = new Column<Contact, String>(nameCell) {
  >           @Override
  >           public String getValue(Contact object) {
  >             // Return the name as the value of this column.
  >             return object.name;
  >           }
  >         };
  >         table.addColumn(nameColumn, "Name");

  >         // Add a field updater to be notified when the user enters a new name.
  >         nameColumn.setFieldUpdater(new FieldUpdater<Contact, String>() {
  >           @Override
  >           public void update(int index, Contact object, String value) {
  >             // Inform the user of the change.
  >             Window.alert("You changed the name of " + object.name + " to " + value);

  >             // Push the changes into the Contact. At this point, you could send an
  >             // asynchronous request to the server to update the database.
  >             object.name = value;

  >             // Redraw the table with the new data.
  >             table.redraw();
  >           }
  >         });

  >         // Push the data into the widget.
  >         table.setRowData(CONTACTS);

  >         // Add it to the root panel.
  >         RootPanel.get().add(table);
  >       }
  >     }

Key provider example

  >     public class KeyProviderExample implements EntryPoint {

  >       /**
  >        * A simple data type that represents a contact.
  >        */
  >       private static class Contact {
  >         private static int nextId = 0;

  >         private final int id;
  >         private String name;

  >         public Contact(String name) {
  >           nextId++;
  >           this.id = nextId;
  >           this.name = name;
  >         }
  >       }

  >       /**
  >        * A custom {@link Cell} used to render a {@link Contact}.
  >        */
  >       private static class ContactCell extends AbstractCell<Contact> {
  >         @Override
  >         public void render(Context context, Contact value, SafeHtmlBuilder sb) {
  >           if (value != null) {
  >             sb.appendEscaped(value.name);
  >           }
  >         }
  >       }

  >       /**
  >        * The list of data to display.
  >        */
  >       private static final List<Contact> CONTACTS = Arrays.asList(new Contact(
  >           "John"), new Contact("Joe"), new Contact("Michael"),
  >           new Contact("Sarah"), new Contact("George"));

  >       public void onModuleLoad() {
  >         /*
  >          * Define a key provider for a Contact. We use the unique ID as the key,
  >          * which allows to maintain selection even if the name changes.
  >          */
  >         ProvidesKey<Contact> keyProvider = new ProvidesKey<Contact>() {
  >           public Object getKey(Contact item) {
  >             // Always do a null check.
  >             return (item == null) ? null : item.id;
  >           }
  >         };

  >         // Create a CellList using the keyProvider.
  >         CellList<Contact> cellList = new CellList<Contact>(new ContactCell(),
  >             keyProvider);

  >         // Push data into the CellList.
  >         cellList.setRowCount(CONTACTS.size(), true);
  >         cellList.setRowData(0, CONTACTS);

  >         // Add a selection model using the same keyProvider.
  >         SelectionModel<Contact> selectionModel = new SingleSelectionModel<Contact>(
  >             keyProvider);
  >         cellList.setSelectionModel(selectionModel);

  >         /*
  >          * Select a contact. The selectionModel will select based on the ID because
  >          * we used a keyProvider.
  >          */
  >         Contact sarah = CONTACTS.get(3);
  >         selectionModel.setSelected(sarah, true);

  >         // Modify the name of the contact.
  >         sarah.name = "Sara";

  >         /*
  >          * Redraw the CellList. Sarah/Sara will still be selected because we
  >          * identify her by ID. If we did not use a keyProvider, Sara would not be
  >          * selected.
  >          */
  >         cellList.redraw();

  >         // Add the widgets to the root panel.
  >         RootPanel.get().add(cellList);
  >       }
  >     }

### Nested Class Summary

Nested Classes
`static interface` `DataGrid.Resources` A ClientBundle that provides images for this widget.
`static interface` `DataGrid.Style` Styles used by this widget.
`(package private) static class` `DataGrid.TableWidget` A simple widget wrapper around a table element.

### Nested classes/interfaces inherited from class com.google.gwt.user.cellview.client.AbstractCellTable

`AbstractCellTable.CellTableKeyboardSelectionHandler<T>, AbstractCellTable.TableSectionChangeHandler, AbstractCellTable.Template`

### Nested classes/interfaces inherited from class com.google.gwt.user.cellview.client.AbstractHasData

`AbstractHasData.DefaultKeyboardSelectionHandler<T>, AbstractHasData.RedrawEvent`

### Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject

`UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled`

### Nested classes/interfaces inherited from interface com.google.gwt.user.cellview.client.HasKeyboardPagingPolicy

`HasKeyboardPagingPolicy.KeyboardPagingPolicy`

### Nested classes/interfaces inherited from interface com.google.gwt.user.cellview.client.HasKeyboardSelectionPolicy

`HasKeyboardSelectionPolicy.KeyboardSelectionPolicy`

### Field Summary

Fields
`(package private) DataGrid.TableWidget` `tableData`
`(package private) DataGrid.TableWidget` `tableFooter`
`(package private) DataGrid.TableWidget` `tableHeader`

### Fields inherited from class com.google.gwt.user.cellview.client.AbstractHasData

`isFocused`

### Fields inherited from class com.google.gwt.user.client.ui.UIObject

`DEBUG_ID_PREFIX`

### Constructor Summary

Constructors
Constructor and Description
`DataGrid()` Constructs a table with a default page size of 50.
`DataGrid(int pageSize)` Constructs a table with the given page size.
`DataGrid(int pageSize, DataGrid.Resources resources)` Constructs a table with the given page size with the specified `DataGrid.Resources`.
`DataGrid(int pageSize, DataGrid.Resources resources, ProvidesKey<T> keyProvider)` Constructs a table with the given page size, the specified `DataGrid.Resources`, and the given key provider.
`DataGrid(int pageSize, DataGrid.Resources resources, ProvidesKey<T> keyProvider, Widget loadingIndicator)` Constructs a table with the given page size, the specified `DataGrid.Resources`, and the given key provider.
`DataGrid(int pageSize, ProvidesKey<T> keyProvider)` Constructs a table with the given page size and the given `key provider`.
`DataGrid(ProvidesKey<T> keyProvider)` Constructs a table with a default page size of 50, and the given `key provider`.

### Method Summary

All Methods Instance Methods Concrete Methods
`void` `addColumnStyleName(int index, java.lang.String styleName)` Add a style name to the `col` element at the specified index, creating it if necessary.
`void` `clearTableWidth()` Clear the width of the tables in this widget, which causes them to fill the available width.
`protected void` `doSetColumnWidth(int column, java.lang.String width)` Set the width of a column.
`protected void` `doSetHeaderVisible(boolean isFooter, boolean isVisible)` Show or hide a header section.
`protected TableSectionElement` `getTableBodyElement()` Get the tbody element that contains the render row values.
`protected TableSectionElement` `getTableFootElement()` Get the tfoot element that contains the footers.
`protected TableSectionElement` `getTableHeadElement()` Get the thead element that contains the headers.
`protected void` `onLoadingStateChanged(LoadingStateChangeEvent.LoadingState state)` Called when the loading state changes.
`void` `onResize()` This method must be called whenever the implementor's size has been modified.
`protected void` `refreshColumnWidths()`
`void` `removeColumnStyleName(int index, java.lang.String styleName)` Remove a style from the `col` element at the specified index.
`void` `setAlwaysShowScrollBars(boolean alwaysShowScrollBars)` Sets whether this grid always shows its scroll bars, or only when necessary.
`void` `setEmptyTableWidget(Widget widget)` Set the widget to display when the table has no rows.
`void` `setLoadingIndicator(Widget widget)` Set the widget to display when the data is loading.
`void` `setMinimumTableWidth(double value, Style.Unit unit)` Set the minimum width of the tables in this widget.
`void` `setTableWidth(double value, Style.Unit unit)` Set the width of the tables in this widget.

### Methods inherited from class com.google.gwt.user.cellview.client.AbstractCellTable

`addColumn, addColumn, addColumn, addColumn, addColumn, addColumn, addColumn, addColumnSortHandler, addRowHoverHandler, clearColumnWidth, clearColumnWidth, convertToElements, dependsOnSelection, flush, getChildContainer, getChildElement, getColumn, getColumnCount, getColumnIndex, getColumnSortList, getColumnWidth, getColumnWidth, getEmptyTableWidget, getFooter, getFooterBuilder, getHeader, getHeaderBuilder, getKeyboardSelectedColumn, getKeyboardSelectedElement, getKeyboardSelectedSubRow, getLoadingIndicator, getRealColumnCount, getResources, getRowElement, getRowStyles, getSubRowElement, insertColumn, insertColumn, insertColumn, insertColumn, insertColumn, insertColumn, insertColumn, isAutoFooterRefreshDisabled, isAutoHeaderRefreshDisabled, isKeyboardNavigationSuppressed, isSkipRowHoverCheck, isSkipRowHoverFloatElementCheck, isSkipRowHoverStyleUpdate, onBlur, onBrowserEvent2, onFocus, redrawFooters, redrawHeaders, removeColumn, removeColumn, renderRowValues, renderRowValuesLegacy, replaceAllChildren, replaceChildren, resetFocusOnCell, setAutoFooterRefreshDisabled, setAutoHeaderRefreshDisabled, setColumnWidth, setColumnWidth, setColumnWidth, setColumnWidth, setFooterBuilder, setHeaderBuilder, setKeyboardSelected, setKeyboardSelectedColumn, setKeyboardSelectedColumn, setKeyboardSelectedRow, setKeyboardSelectedRow, setRowStyles, setSkipRowHoverCheck, setSkipRowHoverFloatElementCheck, setSkipRowHoverStyleUpdate, setTableBuilder`

### Methods inherited from class com.google.gwt.user.cellview.client.AbstractHasData

`addCellPreviewHandler, addLoadingStateChangeHandler, addRangeChangeHandler, addRedrawHandler, addRowCountChangeHandler, addValueChangeHandler, adopt, cellConsumesEventType, checkRowBounds, convertToElements, doAttach, doDetach, getAccessKey, getDisplayedItem, getDisplayedItems, getKeyboardPagingPolicy, getKeyboardSelectedRow, getKeyboardSelectionPolicy, getKeyProvider, getPageSize, getPageStart, getPresenter, getRowContainer, getRowCount, getSelectionModel, getTabIndex, getValueKey, getVisibleItem, getVisibleItemCount, getVisibleItems, getVisibleRange, isRowCountExact, isRowWithinBounds, onBrowserEvent, onUnload, redraw, redrawRow, replaceAllChildren, replaceChildren, setAccessKey, setFocus, setFocusable, setKeyboardPagingPolicy, setKeyboardSelectedRow, setKeyboardSelectionHandler, setKeyboardSelectionPolicy, setPageSize, setPageStart, setRowCount, setRowCount, setRowData, setRowData, setSelected, setSelectionModel, setSelectionModel, setTabIndex, setVisibleRange, setVisibleRange, setVisibleRangeAndClearData, showOrHide`

### Methods inherited from class com.google.gwt.user.client.ui.Composite

`claimElement, getWidget, initializeClaimedElement, initWidget, isAttached, onAttach, onDetach, render, render, resolvePotentialElement, setWidget`

### Methods inherited from class com.google.gwt.user.client.ui.Widget

`addAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, doAttachChildren, doDetachChildren, fireEvent, getHandlerCount, getLayoutData, getParent, isOrWasAttached, onLoad, removeFromParent, setLayoutData, sinkEvents, unsinkEvents`

### Methods inherited from class com.google.gwt.user.client.ui.UIObject

`addStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, setElement, setElement, setHeight, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setVisible, setWidth, sinkBitlessEvent, toString`

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

### Methods inherited from interface com.google.gwt.event.shared.HasHandlers

`fireEvent`

### Field Detail

#### tableData

    final DataGrid.TableWidget tableData

#### tableFooter

    final DataGrid.TableWidget tableFooter

#### tableHeader

    final DataGrid.TableWidget tableHeader

### Constructor Detail

#### DataGrid

    public DataGrid()

Constructs a table with a default page size of 50.

#### DataGrid

    public DataGrid(int pageSize)

Constructs a table with the given page size.

Parameters:
  `pageSize` - the page size

#### DataGrid

    public DataGrid(int pageSize,
                    ProvidesKey<T> keyProvider)

Constructs a table with the given page size and the given `key provider`.

Parameters:
  `pageSize` - the page size
  `keyProvider` - an instance of ProvidesKey<T>, or null if the record object should act as its own key

#### DataGrid

    public DataGrid(int pageSize,
                    DataGrid.Resources resources)

Constructs a table with the given page size with the specified `DataGrid.Resources`.

Parameters:
  `pageSize` - the page size
  `resources` - the resources to use for this widget

#### DataGrid

    public DataGrid(int pageSize,
                    DataGrid.Resources resources,
                    ProvidesKey<T> keyProvider)

Constructs a table with the given page size, the specified `DataGrid.Resources`, and the given key provider.

Parameters:
  `pageSize` - the page size
  `resources` - the resources to use for this widget
  `keyProvider` - an instance of ProvidesKey<T>, or null if the record object should act as its own key

#### DataGrid

    public DataGrid(int pageSize,
                    DataGrid.Resources resources,
                    ProvidesKey<T> keyProvider,
                    Widget loadingIndicator)

Constructs a table with the given page size, the specified `DataGrid.Resources`, and the given key provider.

Parameters:
  `pageSize` - the page size
  `resources` - the resources to use for this widget
  `keyProvider` - an instance of ProvidesKey<T>, or null if the record object should act as its own key
  `loadingIndicator` - the widget to use as a loading indicator, or null to disable

#### DataGrid

    public DataGrid(ProvidesKey<T> keyProvider)

Constructs a table with a default page size of 50, and the given `key provider`.

Parameters:
  `keyProvider` - an instance of ProvidesKey<T>, or null if the record object should act as its own key

### Method Detail

#### addColumnStyleName

    public void addColumnStyleName(int index,
                                   java.lang.String styleName)

Description copied from class: `AbstractCellTable`
Add a style name to the `col` element at the specified index, creating it if necessary.

Specified by:
  `addColumnStyleName` in class `AbstractCellTable<T>`
Parameters:
  `index` - the column index
  `styleName` - the style name to add

#### clearTableWidth

    public void clearTableWidth()

Clear the width of the tables in this widget, which causes them to fill the available width.

The table width is not the same as the width of this widget. If the tables are narrower than this widget, there will be a gap between the table and the edge of the widget. If the tables are wider than this widget, a horizontal scrollbar will appear so the user can scroll horizontally.

See Also:
  `#setMinimumTableWidth(double, Unit)`, `#setTableWidth(double, Unit)`

#### onResize

    public void onResize()

Description copied from interface: `RequiresResize`
This method must be called whenever the implementor's size has been modified.

Specified by:
  `onResize` in interface `RequiresResize`

#### removeColumnStyleName

    public void removeColumnStyleName(int index,
                                      java.lang.String styleName)

Description copied from class: `AbstractCellTable`
Remove a style from the `col` element at the specified index.

Specified by:
  `removeColumnStyleName` in class `AbstractCellTable<T>`
Parameters:
  `index` - the column index
  `styleName` - the style name to remove

#### setAlwaysShowScrollBars

    public void setAlwaysShowScrollBars(boolean alwaysShowScrollBars)

Sets whether this grid always shows its scroll bars, or only when necessary.

Parameters:
  `alwaysShowScrollBars` - `true` to show scroll bars at all times

#### setEmptyTableWidget

    public void setEmptyTableWidget(Widget widget)

Description copied from class: `AbstractCellTable`
Set the widget to display when the table has no rows.

Overrides:
  `setEmptyTableWidget` in class `AbstractCellTable<T>`
Parameters:
  `widget` - the empty table widget, or null to disable

#### setLoadingIndicator

    public void setLoadingIndicator(Widget widget)

Description copied from class: `AbstractCellTable`
Set the widget to display when the data is loading.

Overrides:
  `setLoadingIndicator` in class `AbstractCellTable<T>`
Parameters:
  `widget` - the loading indicator, or null to disable

#### setMinimumTableWidth

    public void setMinimumTableWidth(double value,
                                     Style.Unit unit)

Set the minimum width of the tables in this widget. If the widget become narrower than the minimum width, a horizontal scrollbar will appear so the user can scroll horizontally.

Note that this method is not supported in IE6 and earlier versions of IE.

Parameters:
  `value` - the width
  `unit` - the unit of the width
See Also:
  `#setTableWidth(double, Unit)`

#### setTableWidth

    public void setTableWidth(double value,
                              Style.Unit unit)

Set the width of the tables in this widget. By default, the width is not set and the tables take the available width.

The table width is not the same as the width of this widget. If the tables are narrower than this widget, there will be a gap between the table and the edge of the widget. If the tables are wider than this widget, a horizontal scrollbar will appear so the user can scroll horizontally.

If your table has many columns and you want to ensure that the columns are not truncated, you probably want to use `#setMinimumTableWidth(double, Unit)` instead. That will ensure that the table is wide enough, but it will still allow the table to expand to 100% if the user has a wide screen.

Note that setting the width in percentages will not work on older versions of IE because it does not account for scrollbars when calculating the width.

Parameters:
  `value` - the width
  `unit` - the unit of the width
See Also:
  `#setMinimumTableWidth(double, Unit)`

#### doSetColumnWidth

    protected void doSetColumnWidth(int column,
                                    java.lang.String width)

Description copied from class: `AbstractCellTable`
Set the width of a column.

Specified by:
  `doSetColumnWidth` in class `AbstractCellTable<T>`
Parameters:
  `column` - the column index
  `width` - the width, or null to clear the width

#### doSetHeaderVisible

    protected void doSetHeaderVisible(boolean isFooter,
                                      boolean isVisible)

Description copied from class: `AbstractCellTable`
Show or hide a header section.

Specified by:
  `doSetHeaderVisible` in class `AbstractCellTable<T>`
Parameters:
  `isFooter` - true for the footer, false for the header
  `isVisible` - true to show, false to hide

#### getTableBodyElement

    protected TableSectionElement getTableBodyElement()

Description copied from class: `AbstractCellTable`
Get the tbody element that contains the render row values.

Specified by:
  `getTableBodyElement` in class `AbstractCellTable<T>`

#### getTableFootElement

    protected TableSectionElement getTableFootElement()

Description copied from class: `AbstractCellTable`
Get the tfoot element that contains the footers.

Specified by:
  `getTableFootElement` in class `AbstractCellTable<T>`

#### getTableHeadElement

    protected TableSectionElement getTableHeadElement()

Description copied from class: `AbstractCellTable`
Get the thead element that contains the headers.

Specified by:
  `getTableHeadElement` in class `AbstractCellTable<T>`

#### onLoadingStateChanged

    protected void onLoadingStateChanged(LoadingStateChangeEvent.LoadingState state)

Called when the loading state changes.

Overrides:
  `onLoadingStateChanged` in class `AbstractHasData<T>`
Parameters:
  `state` - the new loading state

#### refreshColumnWidths

    protected void refreshColumnWidths()

Overrides:
  `refreshColumnWidths` in class `AbstractCellTable<T>`