Java tutorial
/* * Copyright 2013-2018 Emmanuel BRUN (contact@amapj.fr) * * This file is part of AmapJ. * * AmapJ is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * AmapJ is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with AmapJ. If not, see <http://www.gnu.org/licenses/>. * * */ package fr.amapj.view.samples.test003; import java.util.Iterator; import com.vaadin.ui.Button; import com.vaadin.ui.Button.ClickEvent; import com.vaadin.ui.Component; import com.vaadin.ui.HorizontalLayout; @SuppressWarnings("serial") public class Segment extends HorizontalLayout { public Segment() { addStyleName("segment"); } public Segment addButton(Button b) { addComponent(b); b.addListener(new Button.ClickListener() { public void buttonClick(ClickEvent event) { if (event.getButton().getStyleName().indexOf("down") == -1) { event.getButton().addStyleName("down"); } else { event.getButton().removeStyleName("down"); } } }); updateButtonStyles(); return this; } private void updateButtonStyles() { int i = 0; Component c = null; for (Iterator<Component> iterator = getComponentIterator(); iterator.hasNext();) { c = iterator.next(); c.removeStyleName("first"); c.removeStyleName("last"); if (i == 0) { c.addStyleName("first"); } i++; } if (c != null) { c.addStyleName("last"); } } }