Java tutorial
/* Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.klwork.explorer.ui.custom; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import com.klwork.explorer.I18nManager; import com.klwork.explorer.Messages; import com.klwork.explorer.NotificationManager; import com.klwork.explorer.ViewToolManager; import com.klwork.explorer.ui.mainlayout.ExplorerLayout; import com.vaadin.event.dd.DragAndDropEvent; import com.vaadin.event.dd.DropHandler; import com.vaadin.event.dd.acceptcriteria.AcceptAll; import com.vaadin.event.dd.acceptcriteria.AcceptCriterion; import com.vaadin.server.StreamVariable; import com.vaadin.ui.Alignment; import com.vaadin.ui.DragAndDropWrapper; import com.vaadin.ui.DragAndDropWrapper.WrapperTransferable; import com.vaadin.ui.Html5File; import com.vaadin.ui.Label; import com.vaadin.ui.Panel; import com.vaadin.ui.ProgressIndicator; import com.vaadin.ui.Upload; import com.vaadin.ui.Upload.FailedEvent; import com.vaadin.ui.Upload.FailedListener; import com.vaadin.ui.Upload.FinishedEvent; import com.vaadin.ui.Upload.FinishedListener; import com.vaadin.ui.Upload.ProgressListener; import com.vaadin.ui.Upload.Receiver; import com.vaadin.ui.Upload.StartedEvent; import com.vaadin.ui.Upload.StartedListener; import com.vaadin.ui.VerticalLayout; import com.vaadin.ui.themes.Reindeer; /** * Component that can be used to upload files using file-select and * HTML5 file dragging. Exposes events to listen to upload start, progress, * finish and cancel. * * @author Joram Barrez * @author Frederik Heremans */ public class UploadComponent extends VerticalLayout implements StartedListener, FinishedListener, FailedListener, ProgressListener, DropHandler { private static final long serialVersionUID = 1L; // Services protected I18nManager i18nManager; protected NotificationManager notificationManager; // Ui components protected ProgressIndicator progressIndicator; protected Upload upload; protected Receiver receiver; // Additional listeners can be attached to the upload components protected List<FinishedListener> finishedListeners = new ArrayList<FinishedListener>(); protected List<StartedListener> startedListeners = new ArrayList<StartedListener>(); protected boolean showGenericFailureMessage = true; protected List<FailedListener> failedListeners = new ArrayList<FailedListener>(); protected List<ProgressListener> progressListeners = new ArrayList<ProgressListener>(); public UploadComponent(String description, Receiver receiver) { this.receiver = receiver; this.i18nManager = ViewToolManager.getI18nManager(); this.notificationManager = ViewToolManager.getNotificationManager(); init(description); } // UI initialisation ---------------------------------------------------------------------------- protected void init(String description) { setSpacing(true); setSizeFull(); addDescription(description); addUpload(); addOrLabel();//or addDropPanel();// } protected void addDescription(String description) { if (description != null) { Label descriptionLabel = new Label(description); descriptionLabel.addStyleName(Reindeer.LABEL_SMALL); descriptionLabel.addStyleName(ExplorerLayout.STYLE_DEPLOYMENT_UPLOAD_DESCRIPTION); addComponent(descriptionLabel); } } protected void addUpload() { this.upload = new Upload(null, receiver); upload.setButtonCaption(i18nManager.getMessage(Messages.UPLOAD_SELECT)); upload.setImmediate(true); addComponent(upload); setComponentAlignment(upload, Alignment.MIDDLE_CENTER); // register ourselves as listener for upload events upload.addListener((StartedListener) this); upload.addListener((FailedListener) this); upload.addListener((FinishedListener) this); upload.addListener((ProgressListener) this); } protected void addOrLabel() { Label orLabel = new Label("or"); orLabel.setSizeUndefined(); orLabel.addStyleName(Reindeer.LABEL_SMALL); addComponent(orLabel); setComponentAlignment(orLabel, Alignment.MIDDLE_CENTER); } protected void addDropPanel() { Panel dropPanel = new Panel(); dropPanel.setContent(new VerticalLayout()); DragAndDropWrapper dragAndDropWrapper = new DragAndDropWrapper(dropPanel); //WW_TODO ? dragAndDropWrapper.setDropHandler(this); dragAndDropWrapper.setWidth("80%"); addComponent(dragAndDropWrapper); setComponentAlignment(dragAndDropWrapper, Alignment.MIDDLE_CENTER); // Label dropLabel = new Label(i18nManager.getMessage(Messages.UPLOAD_DROP)); dropLabel.setSizeUndefined(); ((VerticalLayout) dropPanel.getContent()).addComponent(dropLabel); ((VerticalLayout) dropPanel.getContent()).setComponentAlignment(dropLabel, Alignment.MIDDLE_CENTER); } // File upload event handling ------------------------------------------------------------------- public void uploadStarted(StartedEvent event) { removeAllComponents(); // Visible components are replaced by a progress bar this.progressIndicator = new ProgressIndicator(); progressIndicator.setPollingInterval(500); addComponent(progressIndicator); setComponentAlignment(progressIndicator, Alignment.MIDDLE_CENTER); for (StartedListener startedListener : startedListeners) { startedListener.uploadStarted(event); } } public void updateProgress(long readBytes, long contentLength) { progressIndicator.setValue(new Float(readBytes / (float) contentLength)); for (ProgressListener progressListener : progressListeners) { progressListener.updateProgress(readBytes, contentLength); } } public void uploadFinished(FinishedEvent event) { // Hide progress indicator progressIndicator.setVisible(false); for (FinishedListener finishedListener : finishedListeners) { finishedListener.uploadFinished(event); } } public void uploadFailed(FailedEvent event) { for (FailedListener failedListener : failedListeners) { failedListener.uploadFailed(event); } } // Drag and drop handling (DropHandler) --------------------------------------------------------- public void drop(DragAndDropEvent event) { WrapperTransferable transferable = (WrapperTransferable) event.getTransferable(); Html5File[] files = transferable.getFiles(); if (files.length > 0) { final Html5File file = files[0]; // only support for one file upload at this moment file.setStreamVariable(new StreamVariable() { private static final long serialVersionUID = 1L; public void streamingStarted(StreamingStartEvent event) { uploadStarted(null); // event doesnt matter here } public void streamingFinished(StreamingEndEvent event) { uploadFinished(null); // event doesnt matter here } public void streamingFailed(StreamingErrorEvent event) { uploadFailed(null); } public void onProgress(StreamingProgressEvent event) { updateProgress(event.getBytesReceived(), event.getContentLength()); } public boolean listenProgress() { return true; } public boolean isInterrupted() { return false; } public OutputStream getOutputStream() { return receiver.receiveUpload(file.getFileName(), file.getType()); } }); } } public AcceptCriterion getAcceptCriterion() { return AcceptAll.get(); } // Upload Listeners ---------------------------------------------------------------------------- public void addFinishedListener(FinishedListener finishedListener) { finishedListeners.add(finishedListener); } public void addStartedListener(StartedListener startedListener) { startedListeners.add(startedListener); } public void addFailedListener(FailedListener failedListener) { failedListeners.add(failedListener); } public void addProgressListener(ProgressListener progressListener) { progressListeners.add(progressListener); } }