Package com.vaadin.flow.component.treegrid

Class TreeGrid<T>

java.lang.Object

com.vaadin.flow.component.Component

com.vaadin.flow.component.grid.Grid<T>

com.vaadin.flow.component.treegrid.TreeGrid<T>

Type Parameters:

T - the grid bean type

All Implemented Interfaces:

AttachNotifier, BlurNotifier<Grid<T>>, DetachNotifier, Focusable<Grid<T>>, FocusNotifier<Grid<T>>, HasElement, HasEnabled, HasSize, HasStyle, HasTheme, SortEvent.SortNotifier<Grid<T>,GridSortOrder<T>>, HasDataGenerators<T>, HasDataView<T,Void,GridDataView<T>>, HasLazyDataView<T,Void,GridLazyDataView<T>>, HasListDataView<T,GridListDataView<T>>, HasHierarchicalDataProvider<T>, Serializable

@JsModule("@vaadin/grid/src/vaadin-grid-tree-toggle.js")
public class TreeGrid<T>
extends Grid<T>
implements HasHierarchicalDataProvider<T>

Tree Grid is a component for displaying hierarchical tabular data grouped into expandable and collapsible nodes. Tree Grid is an extension of the Grid component and all Grid’s features are available in Tree Grid as well.

Author:

Vaadin Ltd

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.vaadin.flow.component.grid.Grid

Grid.AbstractGridExtension<T>, Grid.Column<T>, Grid.DataCommunicatorBuilder<T,U extends ArrayUpdater>, Grid.MultiSortPriority, Grid.NestedNullBehavior, Grid.SelectionMode, Grid.UpdateQueue

Nested classes/interfaces inherited from interface com.vaadin.flow.component.BlurNotifier

BlurNotifier.BlurEvent<C extends Component>

Nested classes/interfaces inherited from interface com.vaadin.flow.component.FocusNotifier

FocusNotifier.FocusEvent<C extends Component>

Constructor Summary

Constructors

Constructor	Description
TreeGrid()	Creates a new TreeGrid without support for creating columns based on property names.
TreeGrid(HierarchicalDataProvider<T,?> dataProvider)	Creates a new TreeGrid using the given HierarchicalDataProvider, without support for creating columns based on property names.
TreeGrid(Class<T> beanType)	Creates a new TreeGrid with an initial set of columns for each of the bean's properties.

Method Summary

Modifier and Type	Method	Description
Registration	addCollapseListener(ComponentEventListener<CollapseEvent<T,TreeGrid<T>>> listener)	Adds a CollapseEvent listener to this TreeGrid.
<V extends Component> Grid.Column<T>	addComponentHierarchyColumn(ValueProvider<T,V> componentProvider)	Adds a new Hierarchy column that shows components.
Registration	addExpandListener(ComponentEventListener<ExpandEvent<T,TreeGrid<T>>> listener)	Adds an ExpandEvent listener to this TreeGrid.
Grid.Column<T>	addHierarchyColumn(ValueProvider<T,?> valueProvider)	Adds a new Hierarchy column to this Grid with a value provider.
void	collapse(Collection<T> items)	Collapse the given items.
protected void	collapse(Collection<T> items, boolean userOriginated)	Collapse the given items.
void	collapse(T... items)	Collapse the given items.
void	collapseRecursively(Collection<T> items, int depth)	Collapse the given items and their children recursively until the given depth.
void	collapseRecursively(Stream<T> items, int depth)	Collapse the given items and their children recursively until the given depth.
protected GridArrayUpdater	createDefaultArrayUpdater(SerializableBiFunction<GridArrayUpdater.UpdateQueueData,Integer,Grid.UpdateQueue> updateQueueFactory)
void	expand(Collection<T> items)	Expands the given items.
protected void	expand(Collection<T> items, boolean userOriginated)	Expands the given items.
void	expand(T... items)	Expands the given items.
void	expandRecursively(Collection<T> items, int depth)	Expands the given items and their children recursively until the given depth.
void	expandRecursively(Stream<T> items, int depth)	Expands the given items and their children recursively until the given depth.
HierarchicalDataCommunicator<T>	getDataCommunicator()	Returns the data communicator of this Grid.
HierarchicalDataProvider<T,SerializablePredicate<T>>	getDataProvider()	Returns the data provider of this grid.
GridDataView<T>	getGenericDataView()	Deprecated. not supported
protected Collection<T>	getItemsWithChildrenRecursively(Collection<T> items, int depth)	Gets given items and their children recursively until the given depth.
GridLazyDataView<T>	getLazyDataView()	Deprecated. not supported
GridListDataView<T>	getListDataView()	Deprecated. not supported
boolean	isExpanded(T item)	Returns whether a given item is expanded or collapsed.
void	scrollToIndex(int rowIndex)	The effective index of an item depends on the complete hierarchy of the tree.
Grid.Column<T>	setColumns(String hierarchyPropertyName, ValueProvider<T,?> valueProvider, Collection<String> propertyNames)	Note: This method can only be used for a TreeGrid created from a bean type with TreeGrid(Class).
void	setDataProvider(DataProvider<T,?> dataProvider)
void	setDataProvider(HierarchicalDataProvider<T,?> hierarchicalDataProvider)	Sets the hierarchical data provider for this listing.
Grid.Column<T>	setHierarchyColumn(String propertyName)	Note: This method can only be used for a TreeGrid created from a bean type with TreeGrid(Class).
Grid.Column<T>	setHierarchyColumn(String propertyName, ValueProvider<T,?> valueProvider)	Note: This method can only be used for a TreeGrid created from a bean type with TreeGrid(Class).
GridLazyDataView<T>	setItems(BackEndDataProvider<T,Void> dataProvider)	Deprecated. use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.
GridLazyDataView<T>	setItems(CallbackDataProvider.FetchCallback<T,Void> fetchCallback)	Deprecated. use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.
GridListDataView<T>	setItems(ListDataProvider<T> dataProvider)	Deprecated. use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.
GridListDataView<T>	setItems(Collection<T> items)	Deprecated. use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.
GridListDataView<T>	setItems(T... items)	Deprecated. use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.
void	setUniqueKeyDataGenerator(String propertyName, ValueProvider<T,String> uniqueKeyProvider)	Sets property name and value provider for unique key in row's generated JSON.

Methods inherited from class com.vaadin.flow.component.grid.Grid

addCellFocusListener, addColumn, addColumn, addColumn, addColumn, addColumn, addColumn, addColumn, addColumn, addColumn, addColumnReorderListener, addColumnResizeListener, addColumns, addComponentColumn, addContextMenu, addDataGenerator, addDragEndListener, addDragStartListener, addDropListener, addFirstHeaderRow, addItemClickListener, addItemDoubleClickListener, addSelectionListener, addSortListener, addThemeVariants, addValueProvider, appendFooterRow, appendHeaderRow, asMultiSelect, asSingleSelect, compareMaybeComparables, configureBeanType, createColumn, createColumnId, createEditor, createSortingComparator, deselect, deselectAll, getArrayUpdater, getBeanType, getClassNameGenerator, getColumnByKey, getColumnLayers, getColumns, getDefaultColumnFactory, getDefaultHeaderRow, getDragFilter, getDropFilter, getDropMode, getEditor, getFooterRows, getHeaderRows, getNestedNullBehavior, getPageSize, getPropertySet, getSelectedItems, getSelectionModel, getSortOrder, getUniqueKeyProperty, getUniqueKeyProvider, initConnector, insertColumnLayer, isAllRowsVisible, isColumnReorderingAllowed, isDetailsVisible, isDetailsVisibleOnClick, isHeightByRows, isMultiSort, isRowsDraggable, isVerticalScrollingEnabled, onAttach, onDataProviderChange, onDetach, onEnabledStateChanged, prependFooterRow, prependHeaderRow, recalculateColumnWidths, removeAllColumns, removeColumn, removeColumnByKey, removeColumnLayer, removeColumns, removeThemeVariants, scrollToEnd, scrollToStart, select, setAllRowsVisible, setClassNameGenerator, setColumnKey, setColumnOrder, setColumnOrder, setColumnReorderingAllowed, setColumns, setDefaultMultiSortPriority, setDetailsVisible, setDetailsVisibleOnClick, setDragDataGenerator, setDragFilter, setDropFilter, setDropMode, setHeightByRows, setItemDetailsRenderer, setItems, setItems, setItems, setMultiSort, setMultiSort, setNestedNullBehavior, setPageSize, setRowsDraggable, setSelectionDragDetails, setSelectionMode, setSelectionModel, setSortableColumns, setUniqueKeyProperty, setUniqueKeyProvider, setVerticalScrollingEnabled, sort, updateSelectionModeOnClient

Methods inherited from class com.vaadin.flow.component.Component

addListener, findAncestor, fireEvent, from, get, getChildren, getElement, getEventBus, getId, getListeners, getLocale, getParent, getTranslation, getTranslation, getTranslation, getTranslation, getTranslation, getTranslation, getUI, hasListener, isAttached, isTemplateMapped, isVisible, scrollIntoView, set, setElement, setId, setVisible

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.vaadin.flow.component.AttachNotifier

addAttachListener

Methods inherited from interface com.vaadin.flow.component.BlurNotifier

addBlurListener

Methods inherited from interface com.vaadin.flow.component.DetachNotifier

addDetachListener

Methods inherited from interface com.vaadin.flow.component.Focusable

addFocusShortcut, blur, focus, getTabIndex, setTabIndex

Methods inherited from interface com.vaadin.flow.component.FocusNotifier

addFocusListener

Methods inherited from interface com.vaadin.flow.component.HasElement

getElement

Methods inherited from interface com.vaadin.flow.component.HasEnabled

isEnabled, setEnabled

Methods inherited from interface com.vaadin.flow.data.provider.hierarchy.HasHierarchicalDataProvider

getTreeData, setItems, setItems, setTreeData

Methods inherited from interface com.vaadin.flow.data.provider.HasLazyDataView

setItems

Methods inherited from interface com.vaadin.flow.component.HasSize

getHeight, getHeightUnit, getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, getWidth, getWidthUnit, setHeight, setHeight, setHeightFull, setMaxHeight, setMaxHeight, setMaxWidth, setMaxWidth, setMinHeight, setMinHeight, setMinWidth, setMinWidth, setSizeFull, setSizeUndefined, setWidth, setWidth, setWidthFull

Methods inherited from interface com.vaadin.flow.component.HasStyle

addClassName, addClassNames, getClassName, getClassNames, getStyle, hasClassName, removeClassName, removeClassNames, setClassName, setClassName

Methods inherited from interface com.vaadin.flow.component.HasTheme

addThemeName, addThemeNames, getThemeName, getThemeNames, hasThemeName, removeThemeName, removeThemeNames, setThemeName, setThemeName

Constructor Detail

TreeGrid

public TreeGrid()

Creates a new TreeGrid without support for creating columns based on property names. Use an alternative constructor, such as TreeGrid(Class), to create a TreeGrid that automatically sets up columns based on the type of presented data.

TreeGrid

public TreeGrid(Class<T> beanType)

Creates a new TreeGrid with an initial set of columns for each of the bean's properties. The property-values of the bean will be converted to Strings. Full names of the properties will be used as the column keys and the property captions will be used as the column headers.

Parameters:

beanType - the bean type to use, not null

TreeGrid

public TreeGrid(HierarchicalDataProvider<T,?> dataProvider)

Creates a new TreeGrid using the given HierarchicalDataProvider, without support for creating columns based on property names. Use an alternative constructor, such as TreeGrid(Class), to create a TreeGrid that automatically sets up columns based on the type of presented data.

Parameters:

dataProvider - the data provider, not null

Method Detail

createDefaultArrayUpdater

protected GridArrayUpdater createDefaultArrayUpdater(SerializableBiFunction<GridArrayUpdater.UpdateQueueData,Integer,Grid.UpdateQueue> updateQueueFactory)

Overrides:

createDefaultArrayUpdater in class Grid<T>

setUniqueKeyDataGenerator

public void setUniqueKeyDataGenerator(String propertyName,
                                      ValueProvider<T,String> uniqueKeyProvider)

Sets property name and value provider for unique key in row's generated JSON.

Default property name is 'key' and value is generated by bean's hashCode method.

Parameters:

propertyName - Property name in JSON data

uniqueKeyProvider - Value provider for the target property in JSON data

addExpandListener

public Registration addExpandListener(ComponentEventListener<ExpandEvent<T,TreeGrid<T>>> listener)

Adds an ExpandEvent listener to this TreeGrid.

Parameters:

listener - the listener to add

Returns:

a registration for the listener

See Also:

ExpandEvent

addCollapseListener

public Registration addCollapseListener(ComponentEventListener<CollapseEvent<T,TreeGrid<T>>> listener)

Adds a CollapseEvent listener to this TreeGrid.

Parameters:

listener - the listener to add

Returns:

a registration for the listener

See Also:

CollapseEvent

setDataProvider

public void setDataProvider(DataProvider<T,?> dataProvider)

Description copied from class: Grid

Specified by:

setDataProvider in interface HasHierarchicalDataProvider<T>

Overrides:

setDataProvider in class Grid<T>

Parameters:

dataProvider - the data provider, not null

setDataProvider

public void setDataProvider(HierarchicalDataProvider<T,?> hierarchicalDataProvider)

Description copied from interface: HasHierarchicalDataProvider

Sets the hierarchical data provider for this listing. The data provider provides the items and the hierarchy as needed.

Specified by:

setDataProvider in interface HasHierarchicalDataProvider<T>

Parameters:

hierarchicalDataProvider - the hierarchical data provider to use, not null

setItems

@Deprecated
public GridLazyDataView<T> setItems(BackEndDataProvider<T,Void> dataProvider)

Deprecated.

use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.

Tree grid does not support data views. Use setDataProvider(HierarchicalDataProvider) instead. This method is inherited from Grid and it will throw an UnsupportedOperationException.

Specified by:

setItems in interface HasLazyDataView<T,Void,GridLazyDataView<T>>

Overrides:

setItems in class Grid<T>

Parameters:

dataProvider - the data provider

Returns:

the data view

setItems

@Deprecated
public GridLazyDataView<T> setItems(CallbackDataProvider.FetchCallback<T,Void> fetchCallback)

Deprecated.

use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.

Tree grid supports only hierarchical data so use another method instead. This method is inherited from Grid and it will throw an UnsupportedOperationException.

Specified by:

setItems in interface HasLazyDataView<T,Void,GridLazyDataView<T>>

Parameters:

fetchCallback - the fetch callback

Returns:

the data view

setItems

@Deprecated
public GridListDataView<T> setItems(ListDataProvider<T> dataProvider)

Deprecated.

use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.

Tree grid supports only hierarchical data providers so use another method instead. This method is inherited from Grid and it will throw an UnsupportedOperationException.

Specified by:

setItems in interface HasListDataView<T,GridListDataView<T>>

Overrides:

setItems in class Grid<T>

Parameters:

dataProvider - the data provider

Returns:

the data view

setItems

@Deprecated
public GridListDataView<T> setItems(T... items)

Deprecated.

use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.

Tree grid supports only hierarchical data so use another method instead. This method is inherited from Grid and it will throw an UnsupportedOperationException.

Specified by:

setItems in interface HasListDataView<T,GridListDataView<T>>

Parameters:

items - the items to display, not null

Returns:

the data view

setItems

@Deprecated
public GridListDataView<T> setItems(Collection<T> items)

Deprecated.

use setDataProvider(HierarchicalDataProvider), HasHierarchicalDataProvider.setItems(Collection, ValueProvider), HasHierarchicalDataProvider.setItems(Stream, ValueProvider) or HasHierarchicalDataProvider.setTreeData(TreeData) instead.

Tree grid supports only hierarchical data, so use another method instead. This method is inherited from Grid and it will throw an UnsupportedOperationException.

Specified by:

setItems in interface HasListDataView<T,GridListDataView<T>>

Parameters:

items - the items to display, not null

Returns:

the data view

getListDataView

@Deprecated
public GridListDataView<T> getListDataView()

Deprecated.

not supported

Tree grid does not support list data view, this will throw an UnsupportedOperationException.

Specified by:

getListDataView in interface HasListDataView<T,GridListDataView<T>>

Overrides:

getListDataView in class Grid<T>

Returns:

exception is thrown

getLazyDataView

@Deprecated
public GridLazyDataView<T> getLazyDataView()

Deprecated.

not supported

Tree grid does not support list data view, this will throw an UnsupportedOperationException.

Specified by:

getLazyDataView in interface HasLazyDataView<T,Void,GridLazyDataView<T>>

Overrides:

getLazyDataView in class Grid<T>

Returns:

exception is thrown

getGenericDataView

@Deprecated
public GridDataView<T> getGenericDataView()

Deprecated.

not supported

Tree grid does not support list data view, this will throw an UnsupportedOperationException.

Specified by:

getGenericDataView in interface HasDataView<T,Void,GridDataView<T>>

Overrides:

getGenericDataView in class Grid<T>

Returns:

exception is thrown

See Also:

Grid.getListDataView(), Grid.getLazyDataView()

addHierarchyColumn

public Grid.Column<T> addHierarchyColumn(ValueProvider<T,?> valueProvider)

Adds a new Hierarchy column to this Grid with a value provider. The value is converted to String when sent to the client by using String.valueOf(Object).

Hierarchy column is rendered by using 'vaadin-grid-tree-toggle' web component.

Parameters:

valueProvider - the value provider

Returns:

the created hierarchy column

addComponentHierarchyColumn

public <V extends Component> Grid.Column<T> addComponentHierarchyColumn(ValueProvider<T,V> componentProvider)

Adds a new Hierarchy column that shows components.

NOTE: Using ComponentRenderer is not as efficient as the built in renderers.

Type Parameters:

V - the component type

Parameters:

componentProvider - a value provider that will return a component for the given item

Returns:

the new column

See Also:

Grid.addColumn(Renderer), Grid.removeColumn(Column)

setHierarchyColumn

public Grid.Column<T> setHierarchyColumn(String propertyName)

Note: This method can only be used for a TreeGrid created from a bean type with TreeGrid(Class).

Resets columns and their order based on bean properties.

This is a shortcut for removing all columns and then calling Grid.addColumn(String) for each property except hierarchy column in the bean and addHierarchyColumn(String) for the given propertyName.

Previous column order is preserved.

You can add columns for nested properties with dot notation, eg. "property.nestedProperty"

Note that this also resets the headers and footers.

Parameters:

propertyName - a target hierarchy column property name

Returns:

the created hierarchy column

setHierarchyColumn

public Grid.Column<T> setHierarchyColumn(String propertyName,
                                         ValueProvider<T,?> valueProvider)

Note: This method can only be used for a TreeGrid created from a bean type with TreeGrid(Class).

Resets columns and their order based on bean properties.

This is a shortcut for removing all columns and then calling Grid.addColumn(String) for each property except hierarchy column in the bean and addHierarchyColumn(String) or addHierarchyColumn(ValueProvider) for the given propertyName.

Previous column order is preserved.

You can add columns for nested properties with dot notation, eg. "property.nestedProperty"

Note that this also resets the headers and footers.

Parameters:

propertyName - a target hierarchy column property name

valueProvider - optional value provider

Returns:

the created hierarchy column

setColumns

public Grid.Column<T> setColumns(String hierarchyPropertyName,
                                 ValueProvider<T,?> valueProvider,
                                 Collection<String> propertyNames)

Note: This method can only be used for a TreeGrid created from a bean type with TreeGrid(Class).

Sets the columns and their order based on the given properties.

This is a shortcut for removing all columns and then calling Grid.addColumn(String) for each property except hierarchy property in the bean and addHierarchyColumn(String) for the given hierarchyPropertyName.

You can add columns for nested properties with dot notation, eg. "property.nestedProperty"

Note that this also resets the headers and footers.

Parameters:

hierarchyPropertyName - a target hierarchy column property name

valueProvider - optional value provider

propertyNames - set of properties to create columns for. Including given hierarchyPropertyName

Returns:

the hierarchy column

expand

public void expand(T... items)

Expands the given items.

If an item is currently expanded, does nothing. If an item does not have any children, does nothing.

Parameters:

items - the items to expand

expand

public void expand(Collection<T> items)

Expands the given items.

If an item is currently expanded, does nothing. If an item does not have any children, does nothing.

Parameters:

items - the items to expand

expand

protected void expand(Collection<T> items,
                      boolean userOriginated)

Expands the given items.

Parameters:

items - the items to expand

userOriginated - true if a ExpandEvent triggered by this operation is user originated, false otherwise.

expandRecursively

public void expandRecursively(Stream<T> items,
                              int depth)

Expands the given items and their children recursively until the given depth.

depth describes the maximum distance between a given item and its descendant, meaning that expandRecursively(items, 0) expands only the given items while expandRecursively(items, 2) expands the given items as well as their children and grandchildren.

This method will not fire events for expanded nodes.

Parameters:

items - the items to expand recursively

depth - the maximum depth of recursion

Since:

8.4

expandRecursively

public void expandRecursively(Collection<T> items,
                              int depth)

Expands the given items and their children recursively until the given depth.

depth describes the maximum distance between a given item and its descendant, meaning that expandRecursively(items, 0) expands only the given items while expandRecursively(items, 2) expands the given items as well as their children and grandchildren.

This method will not fire events for expanded nodes.

Parameters:

items - the items to expand recursively

depth - the maximum depth of recursion

Since:

8.4

collapse

public void collapse(T... items)

Collapse the given items.

For items that are already collapsed, does nothing.

Parameters:

items - the collection of items to collapse

collapse

public void collapse(Collection<T> items)

Collapse the given items.

For items that are already collapsed, does nothing.

Parameters:

items - the collection of items to collapse

collapse

protected void collapse(Collection<T> items,
                        boolean userOriginated)

Collapse the given items.

Parameters:

items - the collection of items to collapse

userOriginated - true if a CollapseEvent triggered by this operation is user originated, false otherwise.

collapseRecursively

public void collapseRecursively(Stream<T> items,
                                int depth)

Collapse the given items and their children recursively until the given depth.

depth describes the maximum distance between a given item and its descendant, meaning that collapseRecursively(items, 0) collapses only the given items while collapseRecursively(items, 2) collapses the given items as well as their children and grandchildren.

This method will not fire events for collapsed nodes.

Parameters:

items - the items to collapse recursively

depth - the maximum depth of recursion

Since:

8.4

collapseRecursively

public void collapseRecursively(Collection<T> items,
                                int depth)

Collapse the given items and their children recursively until the given depth.

depth describes the maximum distance between a given item and its descendant, meaning that collapseRecursively(items, 0) collapses only the given items while collapseRecursively(items, 2) collapses the given items as well as their children and grandchildren.

This method will not fire events for collapsed nodes.

Parameters:

items - the items to collapse recursively

depth - the maximum depth of recursion

Since:

8.4

getItemsWithChildrenRecursively

protected Collection<T> getItemsWithChildrenRecursively(Collection<T> items,
                                                        int depth)

Gets given items and their children recursively until the given depth.

depth describes the maximum distance between a given item and its descendant, meaning that getItemsWithChildrenRecursively(items, 0) gets only the given items while getItemsWithChildrenRecursively(items, 2) gets the given items as well as their children and grandchildren.

Parameters:

items - the items to expand recursively

depth - the maximum depth of recursion

Returns:

collection of given items and their children recursively until the given depth

isExpanded

public boolean isExpanded(T item)

Returns whether a given item is expanded or collapsed.

Parameters:

item - the item to check

Returns:

true if the item is expanded, false if collapsed

getDataCommunicator

public HierarchicalDataCommunicator<T> getDataCommunicator()

Description copied from class: Grid

Returns the data communicator of this Grid.

Overrides:

getDataCommunicator in class Grid<T>

Returns:

the data communicator, not null

getDataProvider

public HierarchicalDataProvider<T,SerializablePredicate<T>> getDataProvider()

Description copied from class: Grid

Returns the data provider of this grid.

To get information and control over the items in the grid, use either Grid.getListDataView() or Grid.getLazyDataView() instead.

Specified by:

getDataProvider in interface HasHierarchicalDataProvider<T>

Overrides:

getDataProvider in class Grid<T>

Returns:

the data provider of this grid, not null

scrollToIndex

public void scrollToIndex(int rowIndex)

The effective index of an item depends on the complete hierarchy of the tree. TreeGrid uses lazy loading for performance reasons and does not know about the complete hierarchy. Without the knowledge of the complete hierarchy, TreeGrid can’t reliably calculate an exact scroll position. This uncertainty makes this method unreliable and so should be avoided.

Overrides:

scrollToIndex in class Grid<T>

Parameters:

rowIndex - zero based index of the item to scroll to in the current view.