1 /** 2 * This file Copyright (c) 2018 Magnolia International 3 * Ltd. (http://www.magnolia-cms.com). All rights reserved. 4 * 5 * 6 * This file is dual-licensed under both the Magnolia 7 * Network Agreement and the GNU General Public License. 8 * You may elect to use one or the other of these licenses. 9 * 10 * This file is distributed in the hope that it will be 11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the 12 * implied warranty of MERCHANTABILITY or FITNESS FOR A 13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. 14 * Redistribution, except as permitted by whichever of the GPL 15 * or MNA you select, is prohibited. 16 * 17 * 1. For the GPL license (GPL), you can redistribute and/or 18 * modify this file under the terms of the GNU General 19 * Public License, Version 3, as published by the Free Software 20 * Foundation. You should have received a copy of the GNU 21 * General Public License, Version 3 along with this program; 22 * if not, write to the Free Software Foundation, Inc., 51 23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 24 * 25 * 2. For the Magnolia Network Agreement (MNA), this file 26 * and the accompanying materials are made available under the 27 * terms of the MNA which accompanies this distribution, and 28 * is available at http://www.magnolia-cms.com/mna.html 29 * 30 * Any modifications to this file must keep this entire header 31 * intact. 32 * 33 */ 34 package info.magnolia.ui.vaadin.layout; 35 36 import static java.util.Collections.emptyList; 37 import static java.util.stream.Collectors.toList; 38 39 import info.magnolia.ui.vaadin.gwt.shared.Range; 40 41 import java.util.List; 42 43 import com.vaadin.data.provider.DataProvider; 44 import com.vaadin.data.provider.Query; 45 46 /** 47 * Component for displaying thumbnails of items. 48 * 49 * @param <T> item type. 50 */ 51 public abstract class LazyThumbnailLayout<T> extends LazyLayout<T> { 52 53 private DataProvider<T, ?> dataProvider; 54 55 protected LazyThumbnailLayout(DataProvider<T, ?> dataProvider) { 56 this.dataProvider = dataProvider; 57 dataProvider.addDataProviderListener(event -> { 58 refresh(); 59 markAsDirty(); 60 }); 61 } 62 63 @Override 64 public int size() { 65 return dataProvider.size(new Query<>()); 66 } 67 68 @Override 69 protected List<T> fetchItems(Range added) { 70 return dataProvider.fetch(new Query<>(added.getStart(), added.getEnd(), emptyList(), null, null)).collect(toList()); 71 } 72 }