Package com.vaadin.flow.component.grid

Class AbstractGridMultiSelectionModel<T>

java.lang.Object

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

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

Type Parameters:

T - the grid type

All Implemented Interfaces:

GridMultiSelectionModel<T>, GridSelectionModel<T>, DataGenerator<T>, SelectionModel<Grid<T>,T>, SelectionModel.Multi<Grid<T>,T>, Serializable

public abstract class AbstractGridMultiSelectionModel<T>
extends Grid.AbstractGridExtension<T>
implements GridMultiSelectionModel<T>

Abstract implementation of a GridMultiSelectionModel.

Author:

Vaadin Ltd.

See Also:

• Serialized Form

Nested Class Summary

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

GridMultiSelectionModel.SelectAllCheckboxVisibility

Nested classes/interfaces inherited from interface com.vaadin.flow.data.selection.SelectionModel

SelectionModel.Multi<C extends Component,T>, SelectionModel.Single<C extends Component,T>

Constructor Summary

Constructors

Constructor	Description
AbstractGridMultiSelectionModel(Grid<T> grid)	Constructor for passing a reference of the grid to this implementation.

Method Summary

Modifier and Type	Method	Description
Registration	addMultiSelectionListener(MultiSelectionListener<Grid<T>,T> listener)	Adds a selection listener that will be called when the selection is changed either by the user or programmatically.
Registration	addSelectionListener(SelectionListener<Grid<T>,T> listener)	Adds a generic listener to this selection model, accepting both single and multiselection events.
MultiSelect<Grid<T>,T>	asMultiSelect()	Gets a wrapper to use this multiselection model as a multiselect in Binder.
protected void	clientDeselectAll()
protected void	clientSelectAll()
void	deselect(T item)	Deselects the given item.
void	deselectAll()	Deselects all currently selected items, if any.
void	deselectFromClient(T item)	Handles the deselection of an item that originates from the client.
protected abstract void	fireSelectionEvent(SelectionEvent<Grid<T>,T> event)	Method for handling the firing of selection events.
void	generateData(T item, elemental.json.JsonObject jsonObject)	Adds custom data for the given item to its serialized JsonObject representation.
Optional<T>	getFirstSelectedItem()	Get first selected data item.
GridMultiSelectionModel.SelectAllCheckboxVisibility	getSelectAllCheckboxVisibility()	Gets the current mode for the select all checkbox visibility.
protected Set<Object>	getSelectedItemIds()	Returns an unmodifiable view of the selected item ids.
Set<T>	getSelectedItems()	Returns an immutable set of the currently selected items.
protected GridSelectionColumn	getSelectionColumn()
boolean	isDragSelect()	Gets whether grid drag select is enabled or not.
boolean	isSelectAllCheckboxVisible()	Returns whether the select all checkbox will be visible with the current setting of GridMultiSelectionModel.setSelectAllCheckboxVisibility(SelectAllCheckboxVisibility) and the type of data set to the Grid (in-memory or lazy).
boolean	isSelected(T item)	Returns whether the given item is currently selected.
boolean	isSelectionColumnFrozen()	Gets the the selection column's frozen state.
protected void	remove()	Remove this extension from its target.
void	select(T item)	Selects the given item.
void	selectAll()	Selects all available the items.
void	selectFromClient(T item)	Handles the selection of an item that originates from the client.
void	setDragSelect(boolean dragSelect)	If true, grid rows can be selected or deselected by dragging the mouse cursor over grid's selection column.
void	setSelectAllCheckboxVisibility(GridMultiSelectionModel.SelectAllCheckboxVisibility selectAllCheckBoxVisibility)	Sets the select all checkbox visibility mode.
void	setSelectionColumnFrozen(boolean frozen)	Sets the selection column's frozen state.
void	updateSelection(Set<T> addedItems, Set<T> removedItems)	Updates the selection by adding and removing the given items from it.

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

extend, getGrid, refresh

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.data.provider.DataGenerator

destroyAllData, destroyData, refreshData

Methods inherited from interface com.vaadin.flow.data.selection.SelectionModel.Multi

deselectItems, selectItems

Constructor Details

AbstractGridMultiSelectionModel

public AbstractGridMultiSelectionModel(Grid<T> grid)

Constructor for passing a reference of the grid to this implementation.

Parameters:

grid - reference to the grid for which this selection model is created

Method Details

remove

protected void remove()

Description copied from class: Grid.AbstractGridExtension

Remove this extension from its target.

Overrides:

remove in class Grid.AbstractGridExtension<T>

selectFromClient

public void selectFromClient(T item)

Description copied from interface: GridSelectionModel

Handles the selection of an item that originates from the client.

Specified by:

selectFromClient in interface GridSelectionModel<T>

Parameters:

item - the item being selected

deselectFromClient

public void deselectFromClient(T item)

Description copied from interface: GridSelectionModel

Handles the deselection of an item that originates from the client.

Specified by:

deselectFromClient in interface GridSelectionModel<T>

Parameters:

item - the item being deselected

getSelectedItems

public Set<T> getSelectedItems()

Description copied from interface: SelectionModel

Returns an immutable set of the currently selected items. It is safe to invoke other SelectionModel methods while iterating over the set.

Implementation note: the iteration order of the items in the returned set should be well-defined and documented by the implementing class.

Specified by:

getSelectedItems in interface SelectionModel<Grid<T>,T>

Returns:

the items in the current selection, not null

getSelectedItemIds

protected Set<Object> getSelectedItemIds()

Returns an unmodifiable view of the selected item ids.

Exposed to be overridden within subclasses.

The returned Set may be a direct view of the internal data structures of this class. A defensive copy should be made by callers when iterating over this Set and modifying the selection during iteration to avoid ConcurrentModificationExceptions.

Returns:

An unmodifiable view of the selected item ids. Updates in the selection may or may not be directly reflected in the Set.

getFirstSelectedItem

public Optional<T> getFirstSelectedItem()

Description copied from interface: SelectionModel

Get first selected data item.

This is the same as SelectionModel.Single.getSelectedItem() in case of single selection and the first selected item from SelectionModel.getSelectedItems() in case of multiselection.

Specified by:

getFirstSelectedItem in interface SelectionModel<Grid<T>,T>

Specified by:

getFirstSelectedItem in interface SelectionModel.Multi<Grid<T>,T>

Returns:

the first selected item.

select

public void select(T item)

Description copied from interface: SelectionModel

Selects the given item. Depending on the implementation, may cause other items to be deselected. If the item is already selected, does nothing.

Specified by:

select in interface SelectionModel<Grid<T>,T>

Specified by:

select in interface SelectionModel.Multi<Grid<T>,T>

Parameters:

item - the item to select, not null

deselect

public void deselect(T item)

Description copied from interface: SelectionModel

Deselects the given item. If the item is not currently selected, does nothing.

Specified by:

deselect in interface SelectionModel<Grid<T>,T>

Specified by:

deselect in interface SelectionModel.Multi<Grid<T>,T>

Parameters:

item - the item to deselect, not null

selectAll

public void selectAll()

Description copied from interface: SelectionModel.Multi

Selects all available the items.

Specified by:

selectAll in interface SelectionModel.Multi<Grid<T>,T>

deselectAll

public void deselectAll()

Description copied from interface: SelectionModel

Deselects all currently selected items, if any.

Specified by:

deselectAll in interface SelectionModel<Grid<T>,T>

updateSelection

public void updateSelection(Set<T> addedItems,
 Set<T> removedItems)

Description copied from interface: SelectionModel.Multi

Updates the selection by adding and removing the given items from it.

If all the added items were already selected and the removed items were not selected, this is a NO-OP.

Duplicate items (in both add & remove sets) are ignored.

Specified by:

updateSelection in interface SelectionModel.Multi<Grid<T>,T>

Parameters:

addedItems - the items to add, not null

removedItems - the items to remove, not null

isSelected

public boolean isSelected(T item)

Description copied from interface: SelectionModel

Returns whether the given item is currently selected.

Specified by:

isSelected in interface SelectionModel<Grid<T>,T>

Parameters:

item - the item to check, not null

Returns:

true if the item is selected, false otherwise

asMultiSelect

public MultiSelect<Grid<T>,T> asMultiSelect()

Description copied from interface: GridMultiSelectionModel

Gets a wrapper to use this multiselection model as a multiselect in Binder.

Specified by:

asMultiSelect in interface GridMultiSelectionModel<T>

Returns:

the multiselect wrapper

addSelectionListener

public Registration addSelectionListener(SelectionListener<Grid<T>,T> listener)

Description copied from interface: SelectionModel

Adds a generic listener to this selection model, accepting both single and multiselection events.

Specified by:

addSelectionListener in interface SelectionModel<Grid<T>,T>

Parameters:

listener - the listener to add, not null

Returns:

a registration handle for removing the listener

addMultiSelectionListener

public Registration addMultiSelectionListener(MultiSelectionListener<Grid<T>,T> listener)

Description copied from interface: GridMultiSelectionModel

Adds a selection listener that will be called when the selection is changed either by the user or programmatically.

Specified by:

addMultiSelectionListener in interface GridMultiSelectionModel<T>

Parameters:

listener - the multi selection listener, not null

Returns:

a registration for the listener

setSelectAllCheckboxVisibility

public void setSelectAllCheckboxVisibility(GridMultiSelectionModel.SelectAllCheckboxVisibility selectAllCheckBoxVisibility)

Description copied from interface: GridMultiSelectionModel

Sets the select all checkbox visibility mode.

The default value is GridMultiSelectionModel.SelectAllCheckboxVisibility.DEFAULT, which means that the checkbox is only visible if the grid's data provider is in-memory.

The select all checkbox will never be shown if the Grid uses lazy loading with unknown item count, i.e. no items count query provided to it, and even setting GridMultiSelectionModel.SelectAllCheckboxVisibility.VISIBLE won't make it visible.

Specified by:

setSelectAllCheckboxVisibility in interface GridMultiSelectionModel<T>

Parameters:

selectAllCheckBoxVisibility - the visiblity mode to use

See Also:

• GridMultiSelectionModel.SelectAllCheckboxVisibility

getSelectAllCheckboxVisibility

public GridMultiSelectionModel.SelectAllCheckboxVisibility getSelectAllCheckboxVisibility()

Description copied from interface: GridMultiSelectionModel

Gets the current mode for the select all checkbox visibility.

Specified by:

getSelectAllCheckboxVisibility in interface GridMultiSelectionModel<T>

Returns:

the select all checkbox visibility mode

See Also:

• GridMultiSelectionModel.SelectAllCheckboxVisibility
• GridMultiSelectionModel.isSelectAllCheckboxVisible()

isSelectAllCheckboxVisible

public boolean isSelectAllCheckboxVisible()

Description copied from interface: GridMultiSelectionModel

Returns whether the select all checkbox will be visible with the current setting of GridMultiSelectionModel.setSelectAllCheckboxVisibility(SelectAllCheckboxVisibility) and the type of data set to the Grid (in-memory or lazy).

The select all checkbox will never be shown if the Grid uses lazy loading with unknown item count, meaning that no count callback has been provided.

Specified by:

isSelectAllCheckboxVisible in interface GridMultiSelectionModel<T>

Returns:

true if the checkbox will be visible with the current settings

See Also:

• GridMultiSelectionModel.SelectAllCheckboxVisibility
• GridMultiSelectionModel.setSelectAllCheckboxVisibility(SelectAllCheckboxVisibility)

generateData

public void generateData(T item,
 elemental.json.JsonObject jsonObject)

Description copied from interface: DataGenerator

Adds custom data for the given item to its serialized JsonObject representation. This JSON object will be sent to client-side DataProvider.

Specified by:

generateData in interface DataGenerator<T>

Parameters:

item - the data item being serialized

jsonObject - the JSON object being sent to the client

setSelectionColumnFrozen

public void setSelectionColumnFrozen(boolean frozen)

Description copied from interface: GridMultiSelectionModel

Sets the selection column's frozen state.

Specified by:

setSelectionColumnFrozen in interface GridMultiSelectionModel<T>

Parameters:

frozen - whether to freeze or unfreeze the selection column

isSelectionColumnFrozen

public boolean isSelectionColumnFrozen()

Description copied from interface: GridMultiSelectionModel

Gets the the selection column's frozen state.

Specified by:

isSelectionColumnFrozen in interface GridMultiSelectionModel<T>

Returns:

whether the selection column is frozen

setDragSelect

public void setDragSelect(boolean dragSelect)

Description copied from interface: GridMultiSelectionModel

If true, grid rows can be selected or deselected by dragging the mouse cursor over grid's selection column.

Specified by:

setDragSelect in interface GridMultiSelectionModel<T>

Parameters:

dragSelect - true to enable drag select feature, false for disabling it

isDragSelect

public boolean isDragSelect()

Description copied from interface: GridMultiSelectionModel

Gets whether grid drag select is enabled or not.

Specified by:

isDragSelect in interface GridMultiSelectionModel<T>

Returns:

true if drag select feature is enabled, false otherwise

fireSelectionEvent

protected abstract void fireSelectionEvent(SelectionEvent<Grid<T>,T> event)

Method for handling the firing of selection events.

Parameters:

event - the selection event to fire

clientSelectAll

protected void clientSelectAll()

getSelectionColumn

protected GridSelectionColumn getSelectionColumn()

clientDeselectAll

protected void clientDeselectAll()