Java tutorial
/* * This library is part of OpenCms - * the Open Source Content Management System * * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * For further information about Alkacon Software, please see the * company website: http://www.alkacon.com * * For further information about OpenCms, please see the * project website: http://www.opencms.org * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ package org.opencms.ui.components.extensions; import org.opencms.ui.shared.components.CmsMaxHeightState; import org.opencms.ui.shared.rpc.I_CmsMaxHeightServerRpc; import java.util.List; import com.google.common.collect.Lists; import com.vaadin.server.AbstractExtension; import com.vaadin.server.Sizeable.Unit; import com.vaadin.ui.AbstractComponent; /** * Allows the use of max height in combination with vaadin layout components.<p> */ public class CmsMaxHeightExtension extends AbstractExtension implements I_CmsMaxHeightServerRpc { /** The serial version id. */ private static final long serialVersionUID = 3978957151754705873L; /** The extended component. */ private AbstractComponent m_component; /** The list of height change handlers. */ private List<Runnable> m_heightChangeHandlers = Lists.newArrayList(); /** * Constructor.<p> * * @param component the component to extend * @param maxHeight the max height */ public CmsMaxHeightExtension(AbstractComponent component, int maxHeight) { m_component = component; extend(component); registerRpc(this); getState().setMaxHeight(maxHeight); } /** * Adds an action to execute when the height is changed.<p> * * @param action the action */ public void addHeightChangeHandler(Runnable action) { m_heightChangeHandlers.add(action); } /** * @see org.opencms.ui.shared.rpc.I_CmsMaxHeightServerRpc#fixHeight(int) */ public void fixHeight(int height) { if (height < 1) { m_component.setHeightUndefined(); } else { m_component.setHeight(height, Unit.PIXELS); } for (Runnable handler : m_heightChangeHandlers) { handler.run(); } } /** * Removes a height change handler.<p> * * @param action the handler to remove */ public void removeHeightChangeHandler(Runnable action) { m_heightChangeHandlers.remove(action); } /** * Updates the maximum height.<p> * * @param maxHeight the new value for the maximum height */ public void updateMaxHeight(int maxHeight) { getState().setMaxHeight(maxHeight); } /** * @see com.vaadin.server.AbstractClientConnector#getState() */ @Override protected CmsMaxHeightState getState() { return (CmsMaxHeightState) super.getState(); } }