Java tutorial
/* * Copyright (c) 2016 WisePersist.org * * 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 org.wisepersist.gwt.uploader.demo.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Image; import com.google.gwt.user.client.ui.RootPanel; import com.google.gwt.user.client.ui.VerticalPanel; import com.google.gwt.user.client.ui.Widget; import org.wisepersist.gwt.uploader.client.Uploader; import org.wisepersist.gwt.uploader.client.events.FileDialogCompleteEvent; import org.wisepersist.gwt.uploader.client.events.FileDialogCompleteHandler; import org.wisepersist.gwt.uploader.client.events.FileDialogStartEvent; import org.wisepersist.gwt.uploader.client.events.FileDialogStartHandler; import org.wisepersist.gwt.uploader.client.events.FileQueueErrorEvent; import org.wisepersist.gwt.uploader.client.events.FileQueueErrorHandler; import org.wisepersist.gwt.uploader.client.events.FileQueuedEvent; import org.wisepersist.gwt.uploader.client.events.FileQueuedHandler; import org.wisepersist.gwt.uploader.client.events.UploadCompleteEvent; import org.wisepersist.gwt.uploader.client.events.UploadCompleteHandler; import org.wisepersist.gwt.uploader.client.events.UploadErrorEvent; import org.wisepersist.gwt.uploader.client.events.UploadErrorHandler; import org.wisepersist.gwt.uploader.client.events.UploadProgressEvent; import org.wisepersist.gwt.uploader.client.events.UploadProgressHandler; import org.wisepersist.gwt.uploader.client.progress.ProgressBar; import java.util.LinkedHashMap; import java.util.Map; /** * Uploader Image Button with multiple file selection and GWT Progress Bars example of * GWT SWF Uploader. * * @author delight.wjk@gmail.com */ public class MultiUploadWithProgressBar implements EntryPoint, UploaderSample { private final Uploader uploader = new Uploader(); public void onModuleLoad() { //noinspection GwtToHtmlReferences RootPanel.get("MultiUploadWithProgressBar").add(getUploaderPanel()); } @Override public Widget getUploaderPanel() { final VerticalPanel progressBarPanel = new VerticalPanel(); final Map<String, ProgressBar> progressBars = new LinkedHashMap<String, ProgressBar>(); final Map<String, Image> cancelButtons = new LinkedHashMap<String, Image>(); uploader.setUploadURL("/upload").setButtonImageURL(AppResources.INSTANCE.upload().getSafeUri().asString()) .setButtonWidth(133).setButtonHeight(22).setFileSizeLimit("50 MB") .setButtonCursor(Uploader.Cursor.HAND).setButtonAction(Uploader.ButtonAction.SELECT_FILES) .setFileQueuedHandler(new FileQueuedHandler() { public boolean onFileQueued(final FileQueuedEvent fileQueuedEvent) { // Create a Progress Bar for this file final ProgressBar progressBar = new ProgressBar(0.0, 1.0, 0.0, new CancelProgressBarTextFormatter()); progressBar.setTitle(fileQueuedEvent.getFile().getName()); progressBar.setHeight("18px"); progressBar.setWidth("200px"); progressBars.put(fileQueuedEvent.getFile().getId(), progressBar); // Add Cancel Button Image final Image cancelButton = new Image( AppResources.INSTANCE.cancel().getSafeUri().asString()); cancelButton.setStyleName("cancelButton"); cancelButton.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { uploader.cancelUpload(fileQueuedEvent.getFile().getId(), false); progressBars.get(fileQueuedEvent.getFile().getId()).setProgress(-1.0d); cancelButton.removeFromParent(); } }); cancelButtons.put(fileQueuedEvent.getFile().getId(), cancelButton); // Add the Bar and Button to the interface HorizontalPanel progressBarAndButtonPanel = new HorizontalPanel(); progressBarAndButtonPanel.add(progressBar); progressBarAndButtonPanel.add(cancelButton); progressBarPanel.add(progressBarAndButtonPanel); return true; } }).setUploadProgressHandler(new UploadProgressHandler() { public boolean onUploadProgress(UploadProgressEvent uploadProgressEvent) { ProgressBar progressBar = progressBars.get(uploadProgressEvent.getFile().getId()); progressBar.setProgress((double) uploadProgressEvent.getBytesComplete() / uploadProgressEvent.getBytesTotal()); return true; } }).setUploadCompleteHandler(new UploadCompleteHandler() { public boolean onUploadComplete(UploadCompleteEvent uploadCompleteEvent) { cancelButtons.get(uploadCompleteEvent.getFile().getId()).removeFromParent(); // Call upload to see if any additional files are queued uploader.startUpload(); return true; } }).setFileDialogStartHandler(new FileDialogStartHandler() { public boolean onFileDialogStartEvent(FileDialogStartEvent fileDialogStartEvent) { if (uploader.getStats().getUploadsInProgress() <= 0) { // Clear the uploads that have completed, if none are in process progressBarPanel.clear(); progressBars.clear(); cancelButtons.clear(); } return true; } }).setFileDialogCompleteHandler(new FileDialogCompleteHandler() { public boolean onFileDialogComplete(FileDialogCompleteEvent fileDialogCompleteEvent) { if (uploader.getStats().getUploadsInProgress() <= 0) { uploader.startUpload(); } return true; } }).setFileQueueErrorHandler(new FileQueueErrorHandler() { public boolean onFileQueueError(FileQueueErrorEvent fileQueueErrorEvent) { Window.alert("Upload of file " + fileQueueErrorEvent.getFile().getName() + " failed due to [" + fileQueueErrorEvent.getErrorCode().toString() + "]: " + fileQueueErrorEvent.getMessage()); return true; } }).setUploadErrorHandler(new UploadErrorHandler() { public boolean onUploadError(UploadErrorEvent uploadErrorEvent) { cancelButtons.get(uploadErrorEvent.getFile().getId()).removeFromParent(); Window.alert("Upload of file " + uploadErrorEvent.getFile().getName() + " failed due to [" + uploadErrorEvent.getErrorCode().toString() + "]: " + uploadErrorEvent.getMessage()); return true; } }); HorizontalPanel horizontalPanel = new HorizontalPanel(); horizontalPanel.add(uploader); horizontalPanel.add(progressBarPanel); horizontalPanel.setVerticalAlignment(HorizontalPanel.ALIGN_MIDDLE); horizontalPanel.setCellHorizontalAlignment(uploader, HorizontalPanel.ALIGN_LEFT); horizontalPanel.setCellHorizontalAlignment(progressBarPanel, HorizontalPanel.ALIGN_RIGHT); return horizontalPanel; } @Override public final String getUploaderCode() { return AppResources.INSTANCE.sourceMultiUploadWithProgressBar().getText(); } protected class CancelProgressBarTextFormatter extends ProgressBar.TextFormatter { @Override protected String getText(ProgressBar bar, double curProgress) { if (curProgress < 0) { return "Cancelled"; } return ((int) (100 * bar.getPercent())) + "%"; } } }