com.vaadin.ui
Class CustomComponent

java.lang.Object
  com.vaadin.server.AbstractClientConnector
      com.vaadin.ui.AbstractComponent
          com.vaadin.ui.CustomComponent

All Implemented Interfaces:

MethodEventSource, ClientConnector, Sizeable, com.vaadin.shared.Connector, Component, HasComponents, java.io.Serializable, java.lang.Iterable<Component>

Direct Known Subclasses:

ColorPickerHistory, ColorPickerSelect, DragAndDropWrapper, LoginForm

public class CustomComponent
extends AbstractComponent
implements HasComponents

Custom component provides a simple implementation of the Component interface to allow creating new UI components by composition of existing server-side components.

The component is used by inheriting the CustomComponent class and setting the composition root component. The composition root must be set with setCompositionRoot(Component) before the CustomComponent is used, such as by adding it to a layout, so it is preferable to set it in the constructor.

The composition root itself can contain more components. The advantage of wrapping it in a CustomComponent is that its details, such as interfaces, are hidden from the users of the component, thereby contributing to information hiding.

The CustomComponent does not display the caption of the composition root, so if you want to have it shown in the layout where the custom component is contained, you need to set it as caption of the CustomComponent.

The component expands horizontally and has undefined height by default.

Since:

3.0

Author:

Vaadin Ltd.

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

Field Summary

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

CustomComponent()
Constructs a new custom component.

CustomComponent(Component compositionRoot)
Constructs a new custom component.

Method Summary

int	getComponentCount() Gets the number of contained components.
protected Component	getCompositionRoot() Returns the composition root.
java.util.Iterator<Component>	iterator() Gets an iterator to the collection of contained components.
protected void	setCompositionRoot(Component compositionRoot) Sets the composition root for the component.

Methods inherited from class com.vaadin.ui.AbstractComponent

addListener, addShortcutListener, addStyleName, attach, beforeClientResponse, detach, findAncestor, fireComponentErrorEvent, fireComponentEvent, focus, getActionManager, getCaption, getComponentError, getData, getDebugId, getDescription, getErrorMessage, getHeight, getHeightUnits, getIcon, getId, getLocale, getParent, getPrimaryStyleName, getState, getState, getStyleName, getWidth, getWidthUnits, isConnectorEnabled, isEnabled, isImmediate, isOrHasAncestor, isReadOnly, isVisible, removeListener, removeShortcutListener, removeStyleName, setCaption, setComponentError, setData, setDebugId, setDescription, setEnabled, setHeight, setHeight, setIcon, setId, setImmediate, setLocale, setParent, setPrimaryStyleName, setReadOnly, setSizeFull, setSizeUndefined, setStyleName, setVisible, setWidth, setWidth

Methods inherited from class com.vaadin.server.AbstractClientConnector

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.vaadin.ui.Component

addListener, addStyleName, attach, getCaption, getDescription, getIcon, getId, getLocale, getParent, getPrimaryStyleName, getStyleName, getUI, isEnabled, isReadOnly, isVisible, removeListener, removeStyleName, setCaption, setEnabled, setIcon, setId, setParent, setPrimaryStyleName, setReadOnly, setStyleName, setVisible

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, setHeight, setSizeFull, setSizeUndefined, setWidth, setWidth

Constructor Detail

CustomComponent

public CustomComponent()

Constructs a new custom component.

Note that you must set the composition root before the component can be used, preferably in the constructor.

CustomComponent

public CustomComponent(Component compositionRoot)

Constructs a new custom component.

Parameters:

compositionRoot - the root of the composition component tree. It must not be null.

Method Detail

getCompositionRoot

protected Component getCompositionRoot()

Returns the composition root.

Returns:

the Component Composition root.

setCompositionRoot

protected void setCompositionRoot(Component compositionRoot)

Sets the composition root for the component.

You must set the composition root must to a non-null value before the component can be used. You can change it later.

Parameters:

compositionRoot - the root of the composition component tree.

iterator

public java.util.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.

Specified by:

iterator in interface HasComponents

Specified by:

iterator in interface java.lang.Iterable<Component>

Returns:

the component iterator.

getComponentCount

public int getComponentCount()

Gets the number of contained components. Consistent with the iterator returned by #getComponentIterator().

Returns:

the number of contained components (zero or one)