com.vaadin.ui.SingleComponentContainer Maven / Gradle / Ivy
/*
* Copyright (C) 2000-2024 Vaadin Ltd
*
* This program is available under Vaadin Commercial License and Service Terms.
*
* See for the full
* license.
*/
package com.vaadin.ui;
import com.vaadin.ui.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
* {@link ComponentContainer} instead.
*
* @since 7.0
*/
public interface SingleComponentContainer
extends HasComponents, ComponentAttachDetachNotifier {
/**
* Gets the number of children this {@link SingleComponentContainer} has.
* This must be symmetric with what {@link #iterator()} returns and thus
* typically return 1 if the content is set, 0 otherwise.
*
* @return The number of child components this container has.
*/
public int getComponentCount();
/**
* Gets the content of this container. The content is a component that
* serves as the outermost item of the visual contents.
*
* @return a component to use as content
*
* @see #setContent(Component)
*/
public Component getContent();
/**
* 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.
*
*/
public void setContent(Component content);
}