| /* |
| * 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 { |
| String cwFileUploadButton(); |
| |
| String cwFileUploadDescription(); |
| |
| String cwFileUploadName(); |
| |
| String cwFileUploadNoFileError(); |
| |
| String cwFileUploadSelectFile(); |
| |
| String cwFileUploadSuccessful(); |
| } |
| |
| /** |
| * An instance of the constants. |
| */ |
| @ShowcaseData |
| private final CwConstants constants; |
| |
| /** |
| * Constructor. |
| * |
| * @param constants the constants |
| */ |
| public CwFileUpload(CwConstants constants) { |
| super(constants.cwFileUploadName(), constants.cwFileUploadDescription(), |
| true); |
| this.constants = constants; |
| } |
| |
| /** |
| * 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(CwFileUpload.class, new RunAsyncCallback() { |
| |
| public void onFailure(Throwable caught) { |
| callback.onFailure(caught); |
| } |
| |
| public void onSuccess() { |
| callback.onSuccess(onInitialize()); |
| } |
| }); |
| } |
| } |