com.sciencegadgets.client.UploadButton.java Source code

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Here is the source code for com.sciencegadgets.client.UploadButton.java

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/*******************************************************************************
 *     This file is part of ScienceGadgets, a collection of educational tools
 *     Copyright (C) 2012-2015 by John Gralyan
 *
 *     ScienceGadgets is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Affero General Public License as
 *     published by the Free Software Foundation, either version 3 of
 *     the License, or (at your option) any later version.
 *
 *     ScienceGadgets is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Affero General Public License for more details.
 *
 *     You should have received a copy of the GNU Affero General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *     
 *     Contact us at info@sciencegadgets.org
 *******************************************************************************/
package com.sciencegadgets.client;

import com.google.gwt.dom.client.InputElement;
import com.google.gwt.dom.client.Style.Display;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Timer;
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.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteEvent;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteHandler;
import com.google.gwt.user.client.ui.FormPanel.SubmitEvent;
import com.google.gwt.user.client.ui.FormPanel.SubmitHandler;
import com.sciencegadgets.client.entities.DataModerator;

public class UploadButton extends Composite {

    private FlowPanel contentPanel = new FlowPanel();
    private FormPanel shadowForm = new FormPanel();
    private FileUpload shadowUpload = new FileUpload();
    private Button uploadFace = new Button("Upload");
    private UploadButton uploadButton = this;

    // ========================================================================= //
    //                      INITILIZING                                                                                                              //
    // ========================================================================= //

    public UploadButton() {
        uploadButton.setEncoding(FormPanel.ENCODING_MULTIPART);
        uploadButton.setMethod(FormPanel.METHOD_POST);
        DataModerator.database.getBlobURL(new AsyncCallback<String>() {
            @Override
            public void onSuccess(String url) {
                url = url.replace("Silverado", "localhost");
                uploadButton.setAction(url);
            }

            @Override
            public void onFailure(Throwable caught) {
                Window.alert("Upload failed :(");
            }
        });

        initWidget(contentPanel);

        shadowUpload.getElement().getStyle().setDisplay(Display.NONE);
        shadowUpload.setName("upload");
        //                shadowUpload.getElement().setAttribute("multiple", "multiple");  
        shadowUpload.addChangeHandler(new ChangeHandler() {

            @Override
            public void onChange(ChangeEvent event) {
                shadowForm.submit();
                shadowForm.reset();
            }
        });

        shadowForm.addSubmitHandler(new SubmitHandler() {

            @Override
            public void onSubmit(SubmitEvent event) {
                //                                setLoadingFace();
            }
        });

        shadowForm.addSubmitCompleteHandler(new SubmitCompleteHandler() {

            @Override
            public void onSubmitComplete(SubmitCompleteEvent event) {
                String newUrl = event.getResults();
                setAction(newUrl);
            }
        });

        // Add the visible button
        uploadFace.addDomHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                shadowUpload.getElement().<InputElement>cast().click();

                uploadFace.addStyleName("shakes");

                new Timer() {

                    @Override
                    public void run() {
                        uploadFace.removeStyleName("shakes");
                    }

                }.schedule(700);

            }
        }, ClickEvent.getType());

        shadowForm.add(shadowUpload);
        contentPanel.add(uploadFace);
        contentPanel.add(shadowForm);
    }

    // ========================================================================= //
    //                      EXPOSED FORM METHODS                                                                                     //
    // ========================================================================= //

    public void setAction(String s) {
        shadowForm.setAction(s);
    }

    public void setEncoding(String s) {
        shadowForm.setEncoding(s);
    }

    public void setMethod(String s) {
        shadowForm.setMethod(s);
    }

    public void addSubmitHandler(SubmitHandler h) {
        shadowForm.addSubmitHandler(h);
    }

    public void addSubmitCompleteHandler(SubmitCompleteHandler h) {
        shadowForm.addSubmitCompleteHandler(h);
    }

}