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.client; import org.opencms.ade.upload.client.I_CmsUploadContext; import org.opencms.ade.upload.client.ui.CmsDialogUploadButtonHandler; import org.opencms.gwt.client.ui.input.upload.CmsFileInfo; import org.opencms.ui.components.extensions.CmsUploadAreaExtension; import org.opencms.ui.shared.components.CmsUploadAreaState; import org.opencms.ui.shared.rpc.I_CmsUploadRpc; import java.util.ArrayList; import java.util.List; import com.google.common.base.Supplier; import com.google.gwt.core.client.JavaScriptObject; import com.google.gwt.core.client.JsArray; import com.google.gwt.user.client.ui.Widget; import com.vaadin.client.ComponentConnector; import com.vaadin.client.ServerConnector; import com.vaadin.client.extensions.AbstractExtensionConnector; import com.vaadin.shared.ui.Connect; /** * The upload area connector.<p> */ @Connect(CmsUploadAreaExtension.class) public class CmsUploadAreaConnector extends AbstractExtensionConnector { /** The serial version id. */ private static final long serialVersionUID = 190108090241764065L; /** The RPC proxy. */ private I_CmsUploadRpc m_rpc; /** The widget to enhance. */ private Widget m_widget; /** * Constructor.<p> */ public CmsUploadAreaConnector() { m_rpc = getRpcProxy(I_CmsUploadRpc.class); } /** * @see com.vaadin.client.ui.AbstractConnector#getState() */ @Override public CmsUploadAreaState getState() { return (CmsUploadAreaState) super.getState(); } /** * @see com.vaadin.client.extensions.AbstractExtensionConnector#extend(com.vaadin.client.ServerConnector) */ @Override protected void extend(ServerConnector target) { // Get the extended widget m_widget = ((ComponentConnector) target).getWidget(); initUploadZone(m_widget.getElement()); } /** * Called on drag out.<p> */ void dragOut() { m_widget.removeStyleName("o-upload-drop"); } /** * Called on drag over.<p> */ void dragOver() { m_widget.addStyleName("o-upload-drop"); } /** * Called once the upload is finished<p> * * @param files the uploaded files */ void uploadFinished(List<String> files) { m_rpc.onUploadFinished(files); } /** * Initializes the upload drop zone event handlers.<p> * * @param element the drop zone element */ private native void initUploadZone(JavaScriptObject element)/*-{ // check for file api support if ((typeof FileReader == 'function' || typeof FileReader == 'object') && (typeof FormData == 'function' || typeof FormData == 'object')) { var self = this; function isFileDrag(event) { var result = true; var dt = event.dataTransfer; for (var i = 0; i < dt.types.length; i++) { // in case the types list contains text/html, we assume a DOM element is dragged, and no files if (dt.types[i] == "text/html") { result = false; break; } } return result; } function dragover(event) { if (isFileDrag(event)) { event.stopPropagation(); event.preventDefault(); self.@org.opencms.ui.client.CmsUploadAreaConnector::dragOver()(); } } function dragleave(event) { if (isFileDrag(event)) { event.stopPropagation(); event.preventDefault(); self.@org.opencms.ui.client.CmsUploadAreaConnector::dragOut()(); } } function drop(event) { if (isFileDrag(event)) { event.stopPropagation(); event.preventDefault(); self.@org.opencms.ui.client.CmsUploadAreaConnector::dragOut()(); var dt = event.dataTransfer; var files = dt.files; self.@org.opencms.ui.client.CmsUploadAreaConnector::openUploadWithFiles(Lcom/google/gwt/core/client/JavaScriptObject;)(files); } } element.addEventListener("dragover", dragover, false); element.addEventListener("dragexit", dragleave, false); element.addEventListener("dragleave", dragleave, false); element.addEventListener("dragend", dragleave, false); element.addEventListener("drop", drop, false); } }-*/; /** * Opens the upload dialog with the given file references to upload.<p> * * @param files the file references */ private void openUploadWithFiles(JavaScriptObject files) { JsArray<CmsFileInfo> cmsFiles = files.cast(); List<CmsFileInfo> fileObjects = new ArrayList<CmsFileInfo>(); for (int i = 0; i < cmsFiles.length(); ++i) { fileObjects.add(cmsFiles.get(i)); } CmsDialogUploadButtonHandler buttonHandler = new CmsDialogUploadButtonHandler( new Supplier<I_CmsUploadContext>() { /** * @see com.google.common.base.Supplier#get() */ public I_CmsUploadContext get() { return new I_CmsUploadContext() { public void onUploadFinished(List<String> uploadedFiles) { uploadFinished(uploadedFiles); } }; } }); buttonHandler.setIsTargetRootPath(true); buttonHandler.setTargetFolder(getState().getTargetFolderRootPath()); buttonHandler.openDialogWithFiles(fileObjects); } }