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

Class ValueBoxBase<T>

java.lang.Object

com.google.gwt.user.client.ui.UIObject

com.google.gwt.user.client.ui.Widget

com.google.gwt.user.client.ui.FocusWidget

com.google.gwt.user.client.ui.ValueBoxBase<T>

Type Parameters:

T - the value type

All Implemented Interfaces:

IsEditor<ValueBoxEditor<T>>, HasAllDragAndDropHandlers, HasAllFocusHandlers, HasAllGestureHandlers, HasAllKeyHandlers, HasAllMouseHandlers, HasAllTouchHandlers, HasBlurHandlers, HasChangeHandlers, HasClickHandlers, HasDoubleClickHandlers, HasDragEndHandlers, HasDragEnterHandlers, HasDragHandlers, HasDragLeaveHandlers, HasDragOverHandlers, HasDragStartHandlers, HasDropHandlers, HasFocusHandlers, HasGestureChangeHandlers, HasGestureEndHandlers, HasGestureStartHandlers, HasKeyDownHandlers, HasKeyPressHandlers, HasKeyUpHandlers, HasMouseDownHandlers, HasMouseMoveHandlers, HasMouseOutHandlers, HasMouseOverHandlers, HasMouseUpHandlers, HasMouseWheelHandlers, HasTouchCancelHandlers, HasTouchEndHandlers, HasTouchMoveHandlers, HasTouchStartHandlers, HasAttachHandlers, HasValueChangeHandlers<T>, HasHandlers, AutoDirectionHandler.Target, HasDirection, HasDirectionEstimator, EventListener, TakesValue<T>, Focusable, HasEnabled, HasFocus, HasName, HasText, HasValue<T>, HasVisibility, IsWidget, SourcesClickEvents, SourcesFocusEvents, SourcesKeyboardEvents, SourcesMouseEvents

Direct Known Subclasses:

TextBoxBase, ValueBox

public class ValueBoxBase<T>
extends FocusWidget
implements HasChangeHandlers, HasName, HasDirectionEstimator, HasValue<T>, HasText, AutoDirectionHandler.Target, IsEditor<ValueBoxEditor<T>>

Abstract base class for all text entry widgets.

Use in UiBinder Templates

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	ValueBoxBase.TextAlignment	Alignment values for setAlignment(com.google.gwt.user.client.ui.ValueBoxBase.TextAlignment).

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

UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled

Nested classes/interfaces inherited from interface com.google.gwt.i18n.client.HasDirection

HasDirection.Direction

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

Modifier	Constructor	Description
protected	ValueBoxBase(Element elem, Renderer<T> renderer, Parser<T> parser)	Creates a value box that wraps the given browser element handle.

Method Summary

Modifier and Type	Method	Description
HandlerRegistration	addChangeHandler(ChangeHandler handler)	Adds a ChangeEvent handler.
HandlerRegistration	addValueChangeHandler(ValueChangeHandler<T> handler)	Adds a ValueChangeEvent handler.
ValueBoxEditor<T>	asEditor()	Returns an Editor that is backed by the ValueBoxBase.
void	cancelKey()	If a keyboard event is currently being handled on this text box, calling this method will suppress it.
int	getCursorPos()	Gets the current position of the cursor (this also serves as the beginning of the text selection).
HasDirection.Direction	getDirection()	Gets the directionality of the widget.
DirectionEstimator	getDirectionEstimator()	Gets the direction estimation model of the auto-dir handler.
protected com.google.gwt.user.client.ui.impl.TextBoxImpl	getImpl()
String	getName()	Gets the widget's name.
String	getSelectedText()	Gets the text currently selected within this text box.
int	getSelectionLength()	Gets the length of the current text selection.
String	getText()	Gets this object's text.
T	getValue()	Return the parsed value, or null if the field is empty or parsing fails.
T	getValueOrThrow()	Return the parsed value, or null if the field is empty.
boolean	isReadOnly()	Determines whether or not the widget is read-only.
void	onBrowserEvent(Event event)	Fired whenever a browser event is received.
protected void	onLoad()	This method is called immediately after a widget becomes attached to the browser's document.
void	removeChangeListener(ChangeListener listener)	Deprecated. Use the HandlerRegistration.removeHandler() method on the object returned by addChangeHandler(com.google.gwt.event.dom.client.ChangeHandler) instead
void	selectAll()	Selects all of the text in the box.
void	setAlignment(ValueBoxBase.TextAlignment align)
void	setCursorPos(int pos)	Sets the cursor position.
void	setDirection(HasDirection.Direction direction)	Sets the directionality for a widget.
void	setDirectionEstimator(boolean enabled)	Toggles on / off direction estimation.
void	setDirectionEstimator(DirectionEstimator directionEstimator)	Sets the direction estimation model of the auto-dir handler.
void	setKey(char key)	Deprecated. this method only works in IE and should not have been added to the API
void	setName(String name)	Sets the widget's name.
void	setReadOnly(boolean readOnly)	Turns read-only mode on or off.
void	setSelectionRange(int pos, int length)	Sets the range of text to be selected.
void	setText(String text)	Sets this object's text.
void	setValue(T value)	Sets this object's value without firing any events.
void	setValue(T value, boolean fireEvents)	Sets this object's value.

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

addBlurHandler, addClickHandler, addClickListener, addDoubleClickHandler, addDragEndHandler, addDragEnterHandler, addDragHandler, addDragLeaveHandler, addDragOverHandler, addDragStartHandler, addDropHandler, addFocusHandler, addFocusListener, addGestureChangeHandler, addGestureEndHandler, addGestureStartHandler, addKeyboardListener, addKeyDownHandler, addKeyPressHandler, addKeyUpHandler, addMouseDownHandler, addMouseListener, addMouseMoveHandler, addMouseOutHandler, addMouseOverHandler, addMouseUpHandler, addMouseWheelHandler, addMouseWheelListener, addTouchCancelHandler, addTouchEndHandler, addTouchMoveHandler, addTouchStartHandler, getFocusImpl, getTabIndex, isEnabled, onAttach, removeClickListener, removeFocusListener, removeKeyboardListener, removeMouseListener, removeMouseWheelListener, setAccessKey, setEnabled, setFocus, setTabIndex

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, isAttached, isOrWasAttached, onDetach, 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, resolvePotentialElement, 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

Methods inherited from interface com.google.gwt.event.dom.client.HasKeyUpHandlers

addKeyUpHandler

Constructor Details

ValueBoxBase

protected ValueBoxBase(Element elem,
 Renderer<T> renderer,
 Parser<T> parser)

Creates a value box that wraps the given browser element handle. This is only used by subclasses.

Parameters:

elem - the browser element to wrap

Method Details

addChangeHandler

public HandlerRegistration addChangeHandler(ChangeHandler handler)

Description copied from interface: HasChangeHandlers

Adds a ChangeEvent handler.

Specified by:

addChangeHandler in interface HasChangeHandlers

Parameters:

handler - the change handler

Returns:

HandlerRegistration used to remove this handler

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 ValueBoxEditor<T> asEditor()

Returns an Editor that is backed by the ValueBoxBase. The default implementation returns ValueBoxEditor.of(ValueBoxBase). Subclasses may override this method to provide custom error-handling when using the Editor framework.

Specified by:

asEditor in interface IsEditor<T>

Returns:

an Editor of type E

cancelKey

public void cancelKey()

If a keyboard event is currently being handled on this text box, calling this method will suppress it. This allows listeners to easily filter keyboard input.

getCursorPos

public int getCursorPos()

Gets the current position of the cursor (this also serves as the beginning of the text selection).

Returns:

the cursor's position

getDirection

public HasDirection.Direction getDirection()

Description copied from interface: HasDirection

Gets the directionality of the widget.

Specified by:

getDirection in interface HasDirection

Returns:

RTL if the directionality is right-to-left, LTR if the directionality is left-to-right, or DEFAULT if the directionality is not explicitly specified

getDirectionEstimator

public DirectionEstimator getDirectionEstimator()

Gets the direction estimation model of the auto-dir handler.

Specified by:

getDirectionEstimator in interface HasDirectionEstimator

getName

public String getName()

Description copied from interface: HasName

Gets the widget's name.

Specified by:

getName in interface HasName

Returns:

the widget's name

getSelectedText

public String getSelectedText()

Gets the text currently selected within this text box.

Returns:

the selected text, or an empty string if none is selected

getSelectionLength

public int getSelectionLength()

Gets the length of the current text selection.

Returns:

the text selection length

getText

public String getText()

Description copied from interface: HasText

Gets this object's text.

Specified by:

getText in interface AutoDirectionHandler.Target

Specified by:

getText in interface HasText

Returns:

the object's text

getValue

public T getValue()

Return the parsed value, or null if the field is empty or parsing fails.

Specified by:

getValue in interface HasValue<T>

Specified by:

getValue in interface TakesValue<T>

Returns:

the object's value

See Also:

• TakesValue.setValue(V)

getValueOrThrow

public T getValueOrThrow()
                  throws ParseException

Return the parsed value, or null if the field is empty.

Throws:

ParseException - if the value cannot be parsed

isReadOnly

public boolean isReadOnly()

Determines whether or not the widget is read-only.

Returns:

true if the widget is currently read-only, false if the widget is currently editable

onBrowserEvent

public void onBrowserEvent(Event event)

Description copied from interface: EventListener

Fired whenever a browser event is received.

Specified by:

onBrowserEvent in interface EventListener

Overrides:

onBrowserEvent in class Widget

Parameters:

event - the event received

removeChangeListener

@Deprecated
public void removeChangeListener(ChangeListener listener)

Deprecated.

Use the HandlerRegistration.removeHandler() method on the object returned by addChangeHandler(com.google.gwt.event.dom.client.ChangeHandler) instead

selectAll

public void selectAll()

Selects all of the text in the box. This will only work when the widget is attached to the document and not hidden.

setAlignment

public void setAlignment(ValueBoxBase.TextAlignment align)

setCursorPos

public void setCursorPos(int pos)

Sets the cursor position. This will only work when the widget is attached to the document and not hidden.

Parameters:

pos - the new cursor position

setDirection

public void setDirection(HasDirection.Direction direction)

Description copied from interface: HasDirection

Sets the directionality for a widget.

Specified by:

setDirection in interface HasDirection

Parameters:

direction - RTL if the directionality should be set to right-to-left, LTR if the directionality should be set to left-to-right DEFAULT if the directionality should not be explicitly set

setDirectionEstimator

public void setDirectionEstimator(boolean enabled)

Toggles on / off direction estimation.

Specified by:

setDirectionEstimator in interface HasDirectionEstimator

Parameters:

enabled - Whether to enable direction estimation. If true, sets the DirectionEstimator object to a default DirectionEstimator.

setDirectionEstimator

public void setDirectionEstimator(DirectionEstimator directionEstimator)

Sets the direction estimation model of the auto-dir handler.

Specified by:

setDirectionEstimator in interface HasDirectionEstimator

Parameters:

directionEstimator - The DirectionEstimator to be set. null means turning off direction estimation.

setKey

@Deprecated
public void setKey(char key)

Deprecated.

this method only works in IE and should not have been added to the API

If a keyboard event is currently being handled by the text box, this method replaces the unicode character or key code associated with it. This allows listeners to easily filter keyboard input.

Parameters:

key - the new key value

setName

public void setName(String name)

Description copied from interface: HasName

Sets the widget's name.

Specified by:

setName in interface HasName

Parameters:

name - the widget's new name

setReadOnly

public void setReadOnly(boolean readOnly)

Turns read-only mode on or off.

Parameters:

readOnly - if true, the widget becomes read-only; if false the widget becomes editable

setSelectionRange

public void setSelectionRange(int pos,
 int length)

Sets the range of text to be selected. This will only work when the widget is attached to the document and not hidden.

Parameters:

pos - the position of the first character to be selected

length - the number of characters to be selected

setText

public void setText(String text)

Sets this object's text. Note that some browsers will manipulate the text before adding it to the widget. For example, most browsers will strip all \r from the text, except IE which will add a \r before each \n. Use getText() to get the text directly from the widget.

Specified by:

setText in interface AutoDirectionHandler.Target

Specified by:

setText in interface HasText

Parameters:

text - the object's new text

setValue

public void setValue(T value)

Description copied from interface: HasValue

Sets this object's value without firing any events. This should be identical to calling setValue(value, false).

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

Widgets must accept null as a valid value. By convention, setting a widget to null clears value, calling getValue() on a cleared widget returns null. Widgets that can not be cleared (e.g. CheckBox) must find another valid meaning for null input.

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

getImpl

protected com.google.gwt.user.client.ui.impl.TextBoxImpl getImpl()

onLoad

protected void onLoad()

Description copied from class: Widget

This method is called immediately after a widget becomes attached to the browser's document.

Overrides:

onLoad in class Widget