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Vaadin is a web application framework for Rich Internet Applications (RIA).
Vaadin enables easy development and maintenance of fast and
secure rich web
applications with a stunning look and feel and a wide browser support.
It features a server-side architecture with the majority of the logic
running
on the server. Ajax technology is used at the browser-side to ensure a
rich
and interactive user experience.
/*
* Copyright 2000-2016 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.client.ui;
import java.util.List;
import com.google.gwt.user.client.ui.Widget;
import com.vaadin.client.ComponentConnector;
/**
* Client side connector for subclasses of AbstractSingleComponentConnector.
*
* @since 7.0
*/
public abstract class AbstractSingleComponentContainerConnector
extends AbstractHasComponentsConnector {
/**
* Returns the content (only/first child) of the container.
*
* @return child connector or null if none (e.g. invisible or not set on
* server)
*/
protected ComponentConnector getContent() {
List children = getChildComponents();
if (children.isEmpty()) {
return null;
} else {
return children.get(0);
}
}
/**
* Returns the widget (if any) of the content of the container.
*
* @return widget of the only/first connector of the container, null if no
* content or if there is no widget for the connector
*/
protected Widget getContentWidget() {
ComponentConnector content = getContent();
if (null != content) {
return content.getWidget();
} else {
return null;
}
}
}