001package org.gwtbootstrap3.client.ui.base.mixin; 002 003/* 004 * #%L 005 * GwtBootstrap3 006 * %% 007 * Copyright (C) 2013 GwtBootstrap3 008 * %% 009 * Licensed under the Apache License, Version 2.0 (the "License"); 010 * you may not use this file except in compliance with the License. 011 * You may obtain a copy of the License at 012 * 013 * http://www.apache.org/licenses/LICENSE-2.0 014 * 015 * Unless required by applicable law or agreed to in writing, software 016 * distributed under the License is distributed on an "AS IS" BASIS, 017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 018 * See the License for the specific language governing permissions and 019 * limitations under the License. 020 * #L% 021 */ 022 023import java.util.List; 024 025import org.gwtbootstrap3.client.ui.base.HasDataTarget; 026import org.gwtbootstrap3.client.ui.constants.Attributes; 027 028import com.google.gwt.dom.client.Document; 029import com.google.gwt.dom.client.Element; 030import com.google.gwt.user.client.ui.UIObject; 031import com.google.gwt.user.client.ui.Widget; 032 033/** 034 * @author Sven Jacobs 035 */ 036public class DataTargetMixin<T extends UIObject & HasDataTarget> extends AbstractMixin implements HasDataTarget { 037 038 /** 039 * Ensures the given element has a non-empty id. 040 * 041 * @param element The element being examined. 042 * @see Document#createUniqueId() 043 */ 044 private void ensureId(final Element element) { 045 final String id = element.getId(); 046 if (id == null || id.isEmpty()) { 047 element.setId(Document.get().createUniqueId()); 048 } 049 } 050 051 public DataTargetMixin(final T uiObject) { 052 super(uiObject); 053 } 054 055 @Override 056 public void setDataTargetWidget(final Widget widget) { 057 final Element element = widget.getElement(); 058 ensureId(element); 059 this.setDataTarget("#" + element.getId()); 060 } 061 062 @Override 063 public void setDataTargetWidgets(final List<Widget> widgets) { 064 final String styleName = Document.get().createUniqueId(); 065 for (final Widget widget : widgets) { 066 widget.addStyleName(styleName); 067 } 068 this.setDataTarget("." + styleName); 069 } 070 071 @Override 072 public void setDataTarget(final String dataTarget) { 073 if (dataTarget != null) { 074 uiObject.getElement().setAttribute(Attributes.DATA_TARGET, dataTarget); 075 } else { 076 uiObject.getElement().removeAttribute(Attributes.DATA_TARGET); 077 } 078 } 079 080 @Override 081 public String getDataTarget() { 082 return uiObject.getElement().getAttribute(Attributes.DATA_TARGET); 083 } 084}