com.google.gwt.view.client

Class DefaultSelectionModel<T>

java.lang.Object

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

com.google.gwt.view.client.DefaultSelectionModel<T>

Type Parameters:

T - the data type of records in the list

All Implemented Interfaces:

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

public abstract class DefaultSelectionModel<T>
extends SelectionModel.AbstractSelectionModel<T>

A convenience SelectionModel that allows items to be selected according to a subclass-defined rule, plus a list of positive or negative exceptions.

Nested Class Summary

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

SelectionModel.AbstractSelectionModel<T>

Constructor Summary

Constructors

Constructor and Description
DefaultSelectionModel() Constructs a DefaultSelectionModel without a key provider.
DefaultSelectionModel(ProvidesKey<T> keyProvider) Constructs a DefaultSelectionModel with the given key provider.

Method Summary

Modifier and Type	Method and Description
void	clearExceptions() Removes all exceptions.
protected void	fireSelectionChangeEvent() Fire a SelectionChangeEvent.
protected Map<Object,Boolean>	getExceptions(Map<Object,Boolean> output) Copies the exceptions map into a user-supplied map.
abstract boolean	isDefaultSelected(T item) Returns true if the given item should be selected by default.
boolean	isSelected(T item) If the given item is marked as an exception, return the exception value.
void	setSelected(T item, boolean selected) Sets an item's selection state.

Methods inherited from class com.google.gwt.view.client.SelectionModel.AbstractSelectionModel

addSelectionChangeHandler, fireEvent, getKey, getKeyProvider, isEventCancelled, isEventScheduled, scheduleSelectionChangeEvent, setEventCancelled, setEventScheduled

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, toString

Constructor Detail

DefaultSelectionModel

public DefaultSelectionModel()

Constructs a DefaultSelectionModel without a key provider.

DefaultSelectionModel

public DefaultSelectionModel(ProvidesKey<T> keyProvider)

Constructs a DefaultSelectionModel with the given key provider.

Parameters:

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

Method Detail

clearExceptions

public void clearExceptions()

Removes all exceptions.

isDefaultSelected

public abstract boolean isDefaultSelected(T item)

Returns true if the given item should be selected by default. Subclasses implement this method in order to define the default selection behavior.

Parameters:

item - an object of this SelectionModel's type

Returns:

true if the item should be selected by default

isSelected

public boolean isSelected(T item)

If the given item is marked as an exception, return the exception value. Otherwise, return the value of isDefaultSelected for the given item.

Parameters:

item - the object

Returns:

true if selected, false if not

setSelected

public void setSelected(T item,
                        boolean selected)

Sets an item's selection state. If the item is currently marked as an exception, and the new selected state differs from the previous selected state, the object is removed from the list of exceptions. Otherwise, the object is added to the list of exceptions with the given selected state.

Parameters:

item - the object to select or deselect

selected - true to select, false to deselect

fireSelectionChangeEvent

protected void fireSelectionChangeEvent()

Description copied from class: SelectionModel.AbstractSelectionModel

Fire a SelectionChangeEvent. Multiple firings may be coalesced.

Overrides:

fireSelectionChangeEvent in class SelectionModel.AbstractSelectionModel<T>

getExceptions

protected Map<Object,Boolean> getExceptions(Map<Object,Boolean> output)

Copies the exceptions map into a user-supplied map.

Parameters:

output - the user supplied map

Returns:

the user supplied map