com.vaadin.ui

Class CustomField<T>

java.lang.Object

com.vaadin.server.AbstractClientConnector

com.vaadin.ui.AbstractComponent

com.vaadin.ui.AbstractField<T>

com.vaadin.ui.CustomField<T>

Type Parameters:

T - field value type

All Implemented Interfaces:

HasValue<T>, ContextClickEvent.ContextClickNotifier, MethodEventSource, ClientConnector, Sizeable, Connector, Component, Component.Focusable, HasComponents, Serializable, Iterable<Component>

Direct Known Subclasses:

ColorPickerHistory, ColorPickerSelect

public abstract class CustomField<T>
extends AbstractField<T>
implements HasComponents

A HasValue whose UI content can be constructed by the user, enabling the creation of e.g. form fields by composing Vaadin components. Customization of both the visual presentation and the logic of the field is possible.

Subclasses must implement initContent().

Most custom fields can simply compose a user interface that calls the methods AbstractField.doSetValue(Object) and HasValue.getValue() when necessary.

Since:

8.0

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface com.vaadin.ui.HasComponents

HasComponents.ComponentAttachDetachNotifier, HasComponents.ComponentAttachEvent, HasComponents.ComponentAttachListener, HasComponents.ComponentDetachEvent, HasComponents.ComponentDetachListener

Nested classes/interfaces inherited from interface com.vaadin.ui.Component

Component.ErrorEvent, Component.Event, Component.Focusable, Component.Listener

Nested classes/interfaces inherited from interface com.vaadin.server.ClientConnector

ClientConnector.AttachEvent, ClientConnector.AttachListener, ClientConnector.ConnectorErrorEvent, ClientConnector.DetachEvent, ClientConnector.DetachListener

Nested classes/interfaces inherited from interface com.vaadin.server.Sizeable

Sizeable.Unit

Nested classes/interfaces inherited from interface com.vaadin.data.HasValue

HasValue.ValueChangeEvent<V>, HasValue.ValueChangeListener<V>

Field Summary

Fields inherited from class com.vaadin.ui.AbstractComponent

DESIGN_ATTR_PLAIN_TEXT

Fields inherited from interface com.vaadin.server.Sizeable

SIZE_UNDEFINED, UNITS_CM, UNITS_EM, UNITS_EX, UNITS_INCH, UNITS_MM, UNITS_PERCENTAGE, UNITS_PICAS, UNITS_PIXELS, UNITS_POINTS

Constructor Summary

Constructors

Constructor and Description
CustomField() Constructs a new custom field.

Method Summary

Modifier and Type	Method and Description
void	attach() Constructs the content and notifies it that the CustomField is attached to a window.
void	focus() Sets the focus for this component if the component is Focusable.
protected Component	getContent() Returns the content (UI) of the custom component.
protected CustomFieldState	getState() Returns the shared state bean with information to be sent from the server to the client.
protected CustomFieldState	getState(boolean markAsDirty) Returns the shared state for this connector.
int	getTabIndex() Gets the tabulator index of the Focusable component.
protected abstract Component	initContent() Create the content component or layout for the field.
Iterator<Component>	iterator() Gets an iterator to the collection of contained components.
void	setFocusDelegate(Component.Focusable focusDelegate) Sets the component to which all methods from the Focusable interface should be delegated.
void	setHeight(float height, Sizeable.Unit unit) Sets the height of the object.
void	setTabIndex(int tabIndex) Sets the tabulator index of the Focusable component.
void	setWidth(float width, Sizeable.Unit unit) Sets the width of the object.

Methods inherited from class com.vaadin.ui.AbstractField

addValueChangeListener, createValueChange, doSetValue, getCustomAttributes, isDifferentValue, isReadOnly, isRequiredIndicatorVisible, readDesign, setReadOnly, setRequiredIndicatorVisible, setValue, setValue, writeDesign

Methods inherited from class com.vaadin.ui.AbstractComponent

addContextClickListener, addListener, addShortcutListener, addStyleName, beforeClientResponse, detach, findAncestor, fireComponentErrorEvent, fireComponentEvent, getActionManager, getCaption, getComponentError, getData, getDebugId, getDescription, getErrorMessage, getHeight, getHeightUnits, getIcon, getId, getLocale, getParent, getPrimaryStyleName, getStyleName, getWidth, getWidthUnits, isCaptionAsHtml, isConnectorEnabled, isEnabled, isOrHasAncestor, isResponsive, isVisible, removeContextClickListener, removeListener, removeShortcutListener, removeStyleName, setCaption, setCaptionAsHtml, setComponentError, setData, setDebugId, setDescription, setDescription, setEnabled, setHeight, setHeightUndefined, setIcon, setId, setLocale, setParent, setPrimaryStyleName, setResponsive, setSizeFull, setSizeUndefined, setStyleName, setVisible, setWidth, setWidthUndefined

Methods inherited from class com.vaadin.server.AbstractClientConnector

addAttachListener, addDetachListener, addExtension, addListener, addListener, addListener, addMethodInvocationToQueue, createState, encodeState, equals, fireEvent, getAllChildrenIterable, getConnectorId, getErrorHandler, getExtensions, getListeners, getResource, getRpcManager, getRpcProxy, getSession, getStateType, getUI, handleConnectorRequest, hashCode, hasListeners, isAttached, isThis, markAsDirty, markAsDirtyRecursive, registerRpc, registerRpc, removeAttachListener, removeDetachListener, removeExtension, removeListener, removeListener, removeListener, removeListener, requestRepaint, requestRepaintAll, retrievePendingRpcCalls, setErrorHandler, setResource, updateDiffstate

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.vaadin.ui.Component

addListener, addStyleName, addStyleNames, getCaption, getDescription, getIcon, getId, getLocale, getParent, getPrimaryStyleName, getStyleName, getUI, isEnabled, isVisible, readDesign, removeListener, removeStyleName, removeStyleNames, setCaption, setEnabled, setIcon, setId, setParent, setPrimaryStyleName, setStyleName, setStyleName, setVisible, writeDesign

Methods inherited from interface com.vaadin.server.ClientConnector

addAttachListener, addDetachListener, beforeClientResponse, detach, encodeState, getErrorHandler, getExtensions, getRpcManager, getStateType, handleConnectorRequest, isAttached, isConnectorEnabled, markAsDirty, markAsDirtyRecursive, removeAttachListener, removeDetachListener, removeExtension, requestRepaint, requestRepaintAll, retrievePendingRpcCalls, setErrorHandler

Methods inherited from interface com.vaadin.shared.Connector

getConnectorId

Methods inherited from interface com.vaadin.server.Sizeable

getHeight, getHeightUnits, getWidth, getWidthUnits, setHeight, setHeightUndefined, setSizeFull, setSizeUndefined, setWidth, setWidthUndefined

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface com.vaadin.data.HasValue

clear, getDefaultValidator, getEmptyValue, getOptionalValue, getValue, isEmpty

Constructor Detail

CustomField

public CustomField()

Constructs a new custom field.

The component is implemented by wrapping the methods of the composition root component given as parameter. The composition root must be set before the component can be used.

Method Detail

attach

public void attach()

Constructs the content and notifies it that the CustomField is attached to a window.

Specified by:

attach in interface ClientConnector

Specified by:

attach in interface Component

Overrides:

attach in class AbstractComponent

See Also:

Component.attach()

getContent

protected Component getContent()

Returns the content (UI) of the custom component.

Returns:

Component

initContent

protected abstract Component initContent()

Create the content component or layout for the field. Subclasses of CustomField should implement this method. Note that this method is called when the CustomField is attached to a layout or when getContent() is called explicitly for the first time. It is only called once for a CustomField.

Returns:

Component representing the UI of the CustomField

setHeight

public void setHeight(float height,
                      Sizeable.Unit unit)

Description copied from interface: Sizeable

Sets the height of the object. Negative number implies unspecified size (terminal is free to set the size).

Specified by:

setHeight in interface Sizeable

Overrides:

setHeight in class AbstractComponent

Parameters:

height - the height of the object.

unit - the unit used for the width.

setWidth

public void setWidth(float width,
                     Sizeable.Unit unit)

Description copied from interface: Sizeable

Sets the width of the object. Negative number implies unspecified size (terminal is free to set the size).

Specified by:

setWidth in interface Sizeable

Overrides:

setWidth in class AbstractComponent

Parameters:

width - the width of the object.

unit - the unit used for the width.

getState

protected CustomFieldState getState()

Description copied from class: AbstractComponent

Returns the shared state bean with information to be sent from the server to the client. Subclasses should override this method and set any relevant fields of the state returned by super.getState().

Overrides:

getState in class AbstractField<T>

Returns:

updated component shared state

getState

protected CustomFieldState getState(boolean markAsDirty)

Description copied from class: AbstractClientConnector

Returns the shared state for this connector.

Overrides:

getState in class AbstractField<T>

Parameters:

markAsDirty - true if the connector should automatically be marked dirty, false otherwise

Returns:

The shared state for this connector. Never null.

See Also:

AbstractClientConnector.getState()

iterator

public Iterator<Component> iterator()

Description copied from interface: HasComponents

Gets an iterator to the collection of contained components. Using this iterator it is possible to step through all components contained in this container.

The iterator is typically unmodifiable, and calls to Iterator.remove() throw an exception.

Specified by:

iterator in interface HasComponents

Specified by:

iterator in interface Iterable<Component>

Returns:

the component iterator.

setFocusDelegate

public void setFocusDelegate(Component.Focusable focusDelegate)

Sets the component to which all methods from the Focusable interface should be delegated.

Set this to a wrapped field to include that field in the tabbing order, to make it receive focus when focus() is called and to make it be correctly focused when used as a Grid editor component.

By default, Focusable events are handled by the super class and ultimately ignored.

Parameters:

focusDelegate - the focusable component to which focus events are redirected

focus

public void focus()

Description copied from class: AbstractComponent

Sets the focus for this component if the component is Focusable.

Specified by:

focus in interface Component.Focusable

Overrides:

focus in class AbstractField<T>

See Also:

FieldEvents, FieldEvents.FocusEvent, FieldEvents.FocusListener, FieldEvents.BlurEvent, FieldEvents.BlurListener

getTabIndex

public int getTabIndex()

Description copied from interface: Component.Focusable

Gets the tabulator index of the Focusable component.

Specified by:

getTabIndex in interface Component.Focusable

Overrides:

getTabIndex in class AbstractField<T>

Returns:

tab index set for the Focusable component

See Also:

Component.Focusable.setTabIndex(int)

setTabIndex

public void setTabIndex(int tabIndex)

Description copied from interface: Component.Focusable

Sets the tabulator index of the Focusable component. The tab index property is used to specify the order in which the fields are focused when the user presses the Tab key. Components with a defined tab index are focused sequentially first, and then the components with no tab index.

 Form loginBox = new Form();
 loginBox.setCaption("Login");
 layout.addComponent(loginBox);

 // Create the first field which will be focused
 TextField username = new TextField("User name");
 loginBox.addField("username", username);

 // Set focus to the user name
 username.focus();

 TextField password = new TextField("Password");
 loginBox.addField("password", password);

 Button login = new Button("Login");
 loginBox.getFooter().addComponent(login);

 // An additional component which natural focus order would
 // be after the button.
 CheckBox remember = new CheckBox("Remember me");
 loginBox.getFooter().addComponent(remember);

 username.setTabIndex(1);
 password.setTabIndex(2);
 remember.setTabIndex(3); // Different than natural place
 login.setTabIndex(4);
 

After all focusable user interface components are done, the browser can begin again from the component with the smallest tab index, or it can take the focus out of the page, for example, to the location bar.

If the tab index is not set (is set to zero), the default tab order is used. The order is somewhat browser-dependent, but generally follows the HTML structure of the page.

A negative value means that the component is completely removed from the tabulation order and can not be reached by pressing the Tab key at all.

Specified by:

setTabIndex in interface Component.Focusable

Overrides:

setTabIndex in class AbstractField<T>

Parameters:

tabIndex - the tab order of this component. Indexes usually start from 1. Zero means that default tab order should be used. A negative value means that the field should not be included in the tabbing sequence.

See Also:

Component.Focusable.getTabIndex()