com.google.gwt.view.client

Class SelectionModel.AbstractSelectionModel<T>

java.lang.Object

com.google.gwt.view.client.SelectionModel.AbstractSelectionModel<T>

Type Parameters:

T - the data type of records in the list

All Implemented Interfaces:

HasHandlers, ProvidesKey<T>, SelectionChangeEvent.HasSelectionChangedHandlers, SelectionModel<T>

Direct Known Subclasses:

DefaultSelectionModel, MultiSelectionModel, NoSelectionModel, SingleSelectionModel

Enclosing interface:

SelectionModel<T>

public abstract static class SelectionModel.AbstractSelectionModel<T>
extends Object
implements SelectionModel<T>

A default implementation of SelectionModel that provides listener addition and removal.

Nested Class Summary

Nested classes/interfaces inherited from interface com.google.gwt.view.client.SelectionModel

SelectionModel.AbstractSelectionModel<T>

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractSelectionModel(ProvidesKey<T> keyProvider) Construct an AbstractSelectionModel with a given key provider.

Method Summary

Modifier and Type	Method and Description
HandlerRegistration	addSelectionChangeHandler(SelectionChangeEvent.Handler handler) Adds a SelectionChangeEvent handler.
void	fireEvent(GwtEvent<?> event) Fires the given event to the handlers listening to the event's type.
protected void	fireSelectionChangeEvent() Fire a SelectionChangeEvent.
Object	getKey(T item) Get the key for a list item.
ProvidesKey<T>	getKeyProvider() Returns a ProvidesKey instance that simply returns the input data item.
protected boolean	isEventCancelled() Return true if the next scheduled event should be canceled.
protected boolean	isEventScheduled() Return true if an event is scheduled to be fired.
protected void	scheduleSelectionChangeEvent() Schedules a SelectionChangeEvent to fire at the end of the current event loop.
protected void	setEventCancelled(boolean isEventCancelled) Set whether the next scheduled event should be canceled.
protected void	setEventScheduled(boolean isEventScheduled) Set whether an event is scheduled to be fired.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, toString

Methods inherited from interface com.google.gwt.view.client.SelectionModel

isSelected, setSelected

Constructor Detail

AbstractSelectionModel

protected AbstractSelectionModel(ProvidesKey<T> keyProvider)

Construct an AbstractSelectionModel with a given key provider.

Parameters:

keyProvider - an instance of ProvidesKey, or null if the record object should act as its own key

Method Detail

addSelectionChangeHandler

public HandlerRegistration addSelectionChangeHandler(SelectionChangeEvent.Handler handler)

Description copied from interface: SelectionModel

Adds a SelectionChangeEvent handler.

Specified by:

addSelectionChangeHandler in interface SelectionChangeEvent.HasSelectionChangedHandlers

Specified by:

addSelectionChangeHandler in interface SelectionModel<T>

Parameters:

handler - the handler

Returns:

the registration for the event

fireEvent

public void fireEvent(GwtEvent<?> event)

Description copied from interface: HasHandlers

Fires the given event to the handlers listening to the event's type.

Any exceptions thrown by handlers will be bundled into a UmbrellaException and then re-thrown after all handlers have completed. An exception thrown by a handler will not prevent other handlers from executing.

Specified by:

fireEvent in interface HasHandlers

Parameters:

event - the event

getKey

public Object getKey(T item)

Description copied from interface: ProvidesKey

Get the key for a list item.

Specified by:

getKey in interface ProvidesKey<T>

Parameters:

item - the list item

Returns:

the key that represents the item

getKeyProvider

public ProvidesKey<T> getKeyProvider()

Returns a ProvidesKey instance that simply returns the input data item.

Returns:

the key provider, which may be null

fireSelectionChangeEvent

protected void fireSelectionChangeEvent()

Fire a SelectionChangeEvent. Multiple firings may be coalesced.

isEventCancelled

protected boolean isEventCancelled()

Return true if the next scheduled event should be canceled.

Returns:

true if the event is canceled

isEventScheduled

protected boolean isEventScheduled()

Return true if an event is scheduled to be fired.

Returns:

true if the event is scheduled

scheduleSelectionChangeEvent

protected void scheduleSelectionChangeEvent()

Schedules a SelectionChangeEvent to fire at the end of the current event loop.

setEventCancelled

protected void setEventCancelled(boolean isEventCancelled)

Set whether the next scheduled event should be canceled.

Parameters:

isEventCancelled - if true, cancel the event

setEventScheduled

protected void setEventScheduled(boolean isEventScheduled)

Set whether an event is scheduled to be fired.

Parameters:

isEventScheduled - if true, schedule the event