Package com.google.gwt.user.client.ui

Class ValueListBox<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.client.ui.ValueListBox<T>

Type Parameters:

T - the value type

All Implemented Interfaces:

IsEditor<TakesValueEditor<T>>, HasAttachHandlers, HasValueChangeHandlers<T>, HasHandlers, EventListener, TakesValue<T>, Focusable, HasConstrainedValue<T>, HasEnabled, HasValue<T>, HasVisibility, IsRenderable, IsWidget

public class ValueListBox<T>
extends Composite
implements Focusable, HasConstrainedValue<T>, HasEnabled, IsEditor<TakesValueEditor<T>>

Implementation of HasConstrainedValue based on a SelectElement.

A Renderer is used to get user-presentable strings to display in the select element.

Nested Class Summary

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

UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled

Field Summary

Fields inherited from class com.google.gwt.user.client.ui.Widget

eventsToSink

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

DEBUG_ID_PREFIX, MISSING_ELEMENT_ERROR, SETELEMENT_TWICE_ERROR

Constructor Summary

Constructors

Constructor	Description
ValueListBox()
ValueListBox(Renderer<? super T> renderer)
ValueListBox(Renderer<? super T> renderer, ProvidesKey<T> keyProvider)

Method Summary

Modifier and Type	Method	Description
HandlerRegistration	addValueChangeHandler(ValueChangeHandler<T> handler)	Adds a ValueChangeEvent handler.
TakesValueEditor<T>	asEditor()	Returns a TakesValueEditor backed by the ValueListBox.
int	getTabIndex()	Gets the widget's position in the tab index.
T	getValue()	Gets this object's value.
boolean	isEnabled()	Returns true if the widget is enabled, false if not.
void	setAcceptableValues(Collection<T> newValues)	Set the acceptable values.
void	setAccessKey(char key)	Sets the widget's 'access key'.
void	setEnabled(boolean enabled)	Sets whether this widget is enabled.
void	setFocus(boolean focused)	Explicitly focus/unfocus this widget.
void	setTabIndex(int index)	Sets the widget's position in the tab index.
void	setValue(T value)	Set the value and display it in the select element.
void	setValue(T value, boolean fireEvents)	Sets this object's value.

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

claimElement, getWidget, initializeClaimedElement, initWidget, isAttached, onAttach, onBrowserEvent, 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, ensureHandlers, fireEvent, getHandlerCount, getHandlerManager, getLayoutData, getParent, isOrWasAttached, onLoad, onUnload, removeFromParent, replaceElement, setLayoutData, setParent, 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

Constructor Details

ValueListBox

public ValueListBox()

ValueListBox

public ValueListBox(Renderer<? super T> renderer)

ValueListBox

public ValueListBox(Renderer<? super T> renderer,
 ProvidesKey<T> keyProvider)

Method Details

addValueChangeHandler

public HandlerRegistration addValueChangeHandler(ValueChangeHandler<T> handler)

Description copied from interface: HasValueChangeHandlers

Adds a ValueChangeEvent handler.

Specified by:

addValueChangeHandler in interface HasValueChangeHandlers<T>

Parameters:

handler - the handler

Returns:

the registration for the event

asEditor

public TakesValueEditor<T> asEditor()

Returns a TakesValueEditor backed by the ValueListBox.

Specified by:

asEditor in interface IsEditor<T>

Returns:

an Editor of type E

getTabIndex

public int getTabIndex()

Description copied from interface: Focusable

Gets the widget's position in the tab index.

Specified by:

getTabIndex in interface Focusable

Returns:

the widget's tab index

getValue

public T getValue()

Description copied from interface: HasValue

Gets this object's value.

Specified by:

getValue in interface HasValue<T>

Specified by:

getValue in interface TakesValue<T>

Returns:

the object's value

See Also:

• TakesValue.setValue(V)

isEnabled

public boolean isEnabled()

Description copied from interface: HasEnabled

Returns true if the widget is enabled, false if not.

Specified by:

isEnabled in interface HasEnabled

setAcceptableValues

public void setAcceptableValues(Collection<T> newValues)

Description copied from interface: HasConstrainedValue

Set the acceptable values.

Specified by:

setAcceptableValues in interface HasConstrainedValue<T>

Parameters:

newValues - the acceptible values

setAccessKey

public void setAccessKey(char key)

Description copied from interface: Focusable

Sets the widget's 'access key'. This key is used (in conjunction with a browser-specific modifier key) to automatically focus the widget.

Specified by:

setAccessKey in interface Focusable

Parameters:

key - the widget's access key

setEnabled

public void setEnabled(boolean enabled)

Description copied from interface: HasEnabled

Sets whether this widget is enabled.

Specified by:

setEnabled in interface HasEnabled

Parameters:

enabled - true to enable the widget, false to disable it

setFocus

public void setFocus(boolean focused)

Description copied from interface: Focusable

Explicitly focus/unfocus this widget. Only one widget can have focus at a time, and the widget that does will receive all keyboard events. NOTE: Most browsers fire FocusEvents asynchronously. Especially within GWT tests, you'll need to make your test asynchronous to properly do verifications. See GWTTestCase#delayTestFinish for more information on how to do this.

Specified by:

setFocus in interface Focusable

Parameters:

focused - whether this widget should take focus or release it

setTabIndex

public void setTabIndex(int index)

Description copied from interface: Focusable

Sets the widget's position in the tab index. If more than one widget has the same tab index, each such widget will receive focus in an arbitrary order. Setting the tab index to -1 will cause this widget to be removed from the tab order.

Specified by:

setTabIndex in interface Focusable

Parameters:

index - the widget's tab index

setValue

public void setValue(T value)

Set the value and display it in the select element. Add the value to the acceptable set if it is not already there.

Specified by:

setValue in interface HasValue<T>

Specified by:

setValue in interface TakesValue<T>

Parameters:

value - the object's new value

See Also:

• TakesValue.getValue()

setValue

public void setValue(T value,
 boolean fireEvents)

Description copied from interface: HasValue

Sets this object's value. Fires ValueChangeEvent when fireEvents is true and the new value does not equal the existing value.

It is acceptable to fail assertions or throw (documented) unchecked exceptions in response to bad values.

Specified by:

setValue in interface HasValue<T>

Parameters:

value - the object's new value

fireEvents - fire events if true and value is new