org.wisepersist.gwt.uploader.demo.client.ImageButtonAndProgressText.java Source code

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Here is the source code for org.wisepersist.gwt.uploader.demo.client.ImageButtonAndProgressText.java

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/*
 * 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.i18n.client.NumberFormat;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
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.FileQueueErrorEvent;
import org.wisepersist.gwt.uploader.client.events.FileQueueErrorHandler;
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.events.UploadSuccessEvent;
import org.wisepersist.gwt.uploader.client.events.UploadSuccessHandler;

/**
 * Uploader Image Button and Progress text label example of GWT Uploader.
 *
 * @author delight.wjk@gmail.com
 */
public class ImageButtonAndProgressText implements EntryPoint, UploaderSample {

    private final Label progressLabel = new Label();
    private final Uploader uploader = new Uploader();

    public void onModuleLoad() {
        //noinspection GwtToHtmlReferences
        RootPanel.get("ImageButtonAndProgressText").add(getUploaderPanel());
    }

    @Override
    public Widget getUploaderPanel() {
        progressLabel.setStyleName("progressLabel");
        uploader.setUploadURL("/upload").setButtonImageURL(AppResources.INSTANCE.upload().getSafeUri().asString())
                .setButtonWidth(133).setButtonHeight(22).setFileSizeLimit("50 MB")
                .setButtonCursor(Uploader.Cursor.HAND).setButtonAction(Uploader.ButtonAction.SELECT_FILE)
                .setUploadProgressHandler(new UploadProgressHandler() {
                    public boolean onUploadProgress(UploadProgressEvent uploadProgressEvent) {
                        progressLabel.setText(NumberFormat.getPercentFormat().format(
                                uploadProgressEvent.getBytesComplete() / uploadProgressEvent.getBytesTotal()));
                        return true;
                    }
                }).setUploadSuccessHandler(new UploadSuccessHandler() {
                    public boolean onUploadSuccess(UploadSuccessEvent uploadSuccessEvent) {
                        resetText();
                        StringBuilder sb = new StringBuilder();
                        sb.append("File ").append(uploadSuccessEvent.getFile().getName())
                                .append(" uploaded successfully at ")
                                .append(NumberFormat.getDecimalFormat()
                                        .format(uploadSuccessEvent.getFile().getAverageSpeed() / 1024))
                                .append(" kilobit per second");
                        progressLabel.setText(sb.toString());
                        return true;
                    }
                }).setFileDialogCompleteHandler(new FileDialogCompleteHandler() {
                    public boolean onFileDialogComplete(FileDialogCompleteEvent fileDialogCompleteEvent) {
                        if (fileDialogCompleteEvent.getTotalFilesInQueue() > 0
                                && uploader.getStats().getUploadsInProgress() <= 0) {
                            progressLabel.setText("0%");
                            uploader.startUpload();
                        }
                        return true;
                    }
                }).setFileQueueErrorHandler(new FileQueueErrorHandler() {
                    public boolean onFileQueueError(FileQueueErrorEvent fileQueueErrorEvent) {
                        resetText();
                        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) {
                        resetText();
                        Window.alert("Upload of file " + uploadErrorEvent.getFile().getName() + " failed due to ["
                                + uploadErrorEvent.getErrorCode().toString() + "]: "
                                + uploadErrorEvent.getMessage());
                        return true;
                    }
                });

        VerticalPanel verticalPanel = new VerticalPanel();
        verticalPanel.add(uploader);
        verticalPanel.add(progressLabel);
        verticalPanel.setCellHorizontalAlignment(uploader, HorizontalPanel.ALIGN_LEFT);
        verticalPanel.setCellHorizontalAlignment(progressLabel, HorizontalPanel.ALIGN_LEFT);
        return verticalPanel;
    }

    @Override
    public final String getUploaderCode() {
        return AppResources.INSTANCE.sourceImageButtonAndProgressText().getText();
    }

    private void resetText() {
        progressLabel.setText("");
    }
}