/*
* 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.sample.showcase.client.content.widgets;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.RunAsyncCallback;
import com.google.gwt.i18n.client.Constants;
import com.google.gwt.sample.showcase.client.ContentWidget;
import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseData;
import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseSource;
import com.google.gwt.sample.showcase.client.ShowcaseAnnotations.ShowcaseStyle;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
/**
* Example file.
*/
@ShowcaseStyle(".gwt-FileUpload")
public class CwFileUpload extends ContentWidget {
/**
* The constants used in this Content Widget.
*/
@ShowcaseSource
public static interface CwConstants extends Constants,
ContentWidget.CwConstants {
String cwFileUploadButton();
String cwFileUploadDescription();
String cwFileUploadName();
String cwFileUploadNoFileError();
String cwFileUploadSelectFile();
String cwFileUploadSuccessful();
}
/**
* An instance of the constants.
*/
@ShowcaseData
private CwConstants constants;
/**
* Constructor.
*
* @param constants the constants
*/
public CwFileUpload(CwConstants constants) {
super(constants);
this.constants = constants;
}
@Override
public String getDescription() {
return constants.cwFileUploadDescription();
}
@Override
public String getName() {
return constants.cwFileUploadName();
}
/**
* Initialize this example.
*/
@ShowcaseSource
@Override
public Widget onInitialize() {
// Create a vertical panel to align the content
VerticalPanel vPanel = new VerticalPanel();
// Add a label
vPanel.add(new HTML(constants.cwFileUploadSelectFile()));
// Add a file upload widget
final FileUpload fileUpload = new FileUpload();
fileUpload.ensureDebugId("cwFileUpload");
vPanel.add(fileUpload);
// Add a button to upload the file
Button uploadButton = new Button(constants.cwFileUploadButton());
uploadButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
String filename = fileUpload.getFilename();
if (filename.length() == 0) {
Window.alert(constants.cwFileUploadNoFileError());
} else {
Window.alert(constants.cwFileUploadSuccessful());
}
}
});
vPanel.add(new HTML("<br>"));
vPanel.add(uploadButton);
// Return the layout panel
return vPanel;
}
@Override
protected void asyncOnInitialize(final AsyncCallback<Widget> callback) {
GWT.runAsync(new RunAsyncCallback() {
public void onFailure(Throwable caught) {
callback.onFailure(caught);
}
public void onSuccess() {
callback.onSuccess(onInitialize());
}
});
}
}