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/*
 * 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.client;

import org.opencms.gwt.client.util.CmsDebugLog;
import org.opencms.ui.components.extensions.CmsMaxHeightExtension;
import org.opencms.ui.shared.components.CmsMaxHeightState;
import org.opencms.ui.shared.rpc.I_CmsMaxHeightServerRpc;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.ui.Widget;
import com.vaadin.client.ComponentConnector;
import com.vaadin.client.ServerConnector;
import com.vaadin.client.communication.StateChangeEvent;
import com.vaadin.client.communication.StateChangeEvent.StateChangeHandler;
import com.vaadin.client.extensions.AbstractExtensionConnector;
import com.vaadin.shared.ui.Connect;

/**
 * This connector will manipulate the CSS classes of the extended widget depending on the scroll position.

*/ @Connect(CmsMaxHeightExtension.class) public class CmsMaxHeightConnector extends AbstractExtensionConnector { /** The serial version id. */ private static final long serialVersionUID = -3661096843568550285L; /** The currently set height. */ private int m_currentHeight; /** Flag indicating the required height is currently being evaluated. */ private boolean m_evaluating; /** The native mutation observer. */ private JavaScriptObject m_mutationObserver; /** The RPC proxy. */ private I_CmsMaxHeightServerRpc m_rpc; /** Flag which is set when this connector is unregistered. */ private boolean m_unregistered; /** The widget to enhance. */ private Widget m_widget; /** * Constructor.

*/ public CmsMaxHeightConnector() { m_currentHeight = -1; m_rpc = getRpcProxy(I_CmsMaxHeightServerRpc.class); } /** * @see com.vaadin.client.ui.AbstractConnector#getState() */ @Override public CmsMaxHeightState getState() { return (CmsMaxHeightState)super.getState(); } /** * @see com.vaadin.client.ui.AbstractConnector#onUnregister() */ @Override public void onUnregister() { super.onUnregister(); m_unregistered = true; removeObserver(); } /** * @see com.vaadin.client.extensions.AbstractExtensionConnector#extend(com.vaadin.client.ServerConnector) */ @Override protected void extend(ServerConnector target) { target.isEnabled(); // Get the extended widget m_widget = ((ComponentConnector)target).getWidget(); addMutationObserver(m_widget.getElement()); addStateChangeHandler(new StateChangeHandler() { @SuppressWarnings("synthetic-access") public void onStateChanged(StateChangeEvent stateChangeEvent) { m_currentHeight = -1; handleMutation(); } }); } /** * Handles the widget mutation.

*/ protected void handleMutation() { if (m_unregistered) { removeObserver(); return; } int maxHeight = getState().getMaxHeight(); if (m_currentHeight > 0) { removeObserver(); // clear height m_widget.getElement().getStyle().clearHeight(); if ((m_widget.getOffsetHeight() + 10) < m_currentHeight) { m_currentHeight = -1; m_rpc.fixHeight(m_currentHeight); } else { m_widget.getElement().getStyle().setHeight(m_currentHeight, Unit.PX); } addMutationObserver(m_widget.getElement()); } else if ((maxHeight > 0) && (m_widget.getOffsetHeight() > maxHeight)) { m_currentHeight = maxHeight; m_rpc.fixHeight(m_currentHeight); } } /** * Adds a native mutation observer to the widget element.

* * @param element the element */ private native void addMutationObserver(Element element)/*-{ var self = this; var observer = new MutationObserver( function(mutations) { [email protected]::handleMutation()(); }); [email protected]::m_mutationObserver = observer; // configuration of the observer: var config = { attributes : true, childList : true, characterData : true, subtree : true }; // pass in the target node, as well as the observer options observer.observe(element, config); }-*/; /** * Removes the mutation observer.

*/ private native void removeObserver()/*-{ if ([email protected]::m_mutationObserver != null) { [email protected]::m_mutationObserver .disconnect(); [email protected]::m_mutationObserver = null; } }-*/; }





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