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/*
* Copyright 2000-2013 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the 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.
*
* @return a component (typically a layout) to use as content
*/
public void setContent(Component content);
}
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