/*
* Copyright 2008 Google Inc.
*
* 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.google.gwt.gears.sample.uploaddemo.client;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.gears.client.Factory;
import com.google.gwt.gears.client.blob.Blob;
import com.google.gwt.gears.client.desktop.Desktop;
import com.google.gwt.gears.client.desktop.File;
import com.google.gwt.gears.client.desktop.OpenFilesHandler;
import com.google.gwt.gears.client.httprequest.HttpRequest;
import com.google.gwt.gears.client.httprequest.ProgressEvent;
import com.google.gwt.gears.client.httprequest.ProgressHandler;
import com.google.gwt.gears.client.httprequest.RequestCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.TextBox;
/**
* Roughly replicates a FORM upload using Gears.
* <p>
* When the user clicks the Browse button, the Desktop.openFiles method is
* invoked allowing the user to select a file. The selection is saved as a Blob
* reference and upload as the body of the POST request when the Upload button
* is clicked.
*/
public class UploadDemo implements EntryPoint {
final Factory factory = Factory.getInstance();
RootPanel root;
Blob selectedFile;
/**
* This is the entry point method.
*/
public void onModuleLoad() {
root = RootPanel.get();
final Button browse = new Button("Browse");
final Button upload = new Button("Upload");
upload.setEnabled(false);
final TextBox selected = new TextBox();
selected.setEnabled(false);
final SimplePanel progressInner = new SimplePanel();
progressInner.addStyleName("progressInner");
final SimplePanel progressGauge = new SimplePanel();
progressGauge.addStyleName("progressGauge");
progressGauge.add(progressInner);
final HTML result = new HTML();
browse.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
Desktop desktop = factory.createDesktop();
desktop.openFiles(new OpenFilesHandler() {
public void onOpenFiles(OpenFilesEvent event) {
File[] files = event.getFiles();
selected.setText(files[0].getName());
selectedFile = files[0].getBlob();
upload.setEnabled(true);
}
}, true);
}
});
upload.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
HttpRequest request = factory.createHttpRequest();
request.open("POST", GWT.getModuleBaseURL() + "upload");
request.setRequestHeader("X-Filename", selected.getText());
request.setCallback(new RequestCallback() {
public void onResponseReceived(HttpRequest request) {
String msg = request.getStatus() + " " + request.getResponseText();
if (request.getStatus() != 200) {
result.setHTML("<p style=\"color:red\">" + msg + "</p>");
} else {
result.setHTML("<p style=\"color:green\">" + msg + "</p>");
}
}
});
request.getUpload().setProgressHandler(new ProgressHandler() {
public void onProgress(ProgressEvent event) {
double pcnt = ((double) event.getLoaded() / event.getTotal());
progressInner.setWidth((int) Math.floor(pcnt * 100) + "%");
}
});
request.send(selectedFile);
}
});
HorizontalPanel inputPanel = new HorizontalPanel();
inputPanel.add(selected);
inputPanel.add(browse);
inputPanel.add(upload);
root.add(inputPanel);
root.add(new HTML("Progress:"));
root.add(progressGauge);
root.add(result);
}
}