12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061 |
- /*
- * Copyright 2000-2018 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<ComponentConnector> 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;
- }
- }
-
- }
|