com.vaadin.ui.SingleComponentContainer API 8.27.7 | Vaadin

com.vaadin.ui.

All Superinterfaces:

ClientConnector, Component, Connector, HasComponents, HasComponents.ComponentAttachDetachNotifier, Iterable<Component>, Serializable, Sizeable

All Known Implementing Classes:

AbstractSingleComponentContainer, ColorPickerPopup, LegacyWindow, LoginForm, Panel, UI, Window
```
public interface SingleComponentContainer
extends HasComponents, HasComponents.ComponentAttachDetachNotifier
```
Interface for component containers that have one child component and do not support adding or removing components. For component containers that support multiple children, see ComponentContainer instead.

Since:

7.0

Nested Class Summary
- 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.ui.Component
  Component.ErrorEvent, Component.Event, Component.Focusable, Component.Listener
- 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.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

Method Summary

All Methods
Modifier and Type	Method	Description
`int`	`getComponentCount()`	Gets the number of children this `SingleComponentContainer` has.
`Component`	`getContent()`	Gets the content of this container.
`void`	`setContent(Component content)`	Sets the content of this container.

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.ui.Component
addListener, addStyleName, addStyleNames, attach, 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.shared.Connector
getConnectorId

Methods inherited from interface com.vaadin.ui.HasComponents
iterator

Methods inherited from interface com.vaadin.ui.HasComponents.ComponentAttachDetachNotifier
addComponentAttachListener, addComponentDetachListener, removeComponentAttachListener, removeComponentDetachListener

Methods inherited from interface java.lang.Iterable
forEach, spliterator

Methods inherited from interface com.vaadin.server.Sizeable
getHeight, getHeightUnits, getWidth, getWidthUnits, setHeight, setHeight, setHeightFull, setHeightUndefined, setSizeFull, setSizeUndefined, setWidth, setWidth, setWidthFull, setWidthUndefined

- Method Detail
  - getComponentCount
```
int getComponentCount()
```
    Gets the number of children this SingleComponentContainer has. This must be symmetric with what HasComponents.iterator() returns and thus typically return 1 if the content is set, 0 otherwise.
    
    Returns:
    
    The number of child components this container has.
  - getContent
```
Component getContent()
```
    Gets the content of this container. The content is a component that serves as the outermost item of the visual contents.
    
    Returns:
    
    a component to use as content
    
    See Also:
    
    setContent(Component)
  - setContent
```
void setContent(Component content)
```
    Sets the content of this container. The content is a component that serves as the outermost item of the visual contents. The content should always be set, either as a constructor parameter or by calling this method.