it.unibo.cs.v2.client.MainPage.java Source code

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Here is the source code for it.unibo.cs.v2.client.MainPage.java

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/* Copyright 2011 Massimo Gengarelli <gengarel@cs.unibo.it>
 * This file is part of Floz Configurator.
 * Floz Configurator is free software: you can redistribute it and/or modify it 
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or 
 * (at your option) any later version.
 *
 * Floz Configurator 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with Floz Configurator. If not, see http://www.gnu.org/licenses/.
 */

package it.unibo.cs.v2.client;

import it.unibo.cs.v2.servlets.ShutdownMachine;
import it.unibo.cs.v2.servlets.ShutdownMachineAsync;
import it.unibo.cs.v2.shared.MachineProcessInfo;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.History;
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.HTML;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.Widget;

public class MainPage extends HTMLPanel implements ValueChangeHandler<String> {
    private static MainPage instance;
    private final String WELCOME = "<h2>Welcome to Live ShockVM!</h2>"
            + "This is the main interface of <b>Live ShockVM</b>, use the left panel to create a new machine or to start up"
            + " the machines you've already created. The left panel is divided into three menus: the one with your name is the main menu, where you can create "
            + "a new machine; the second one is a short brief of the machines you already own while the latter one displays the MOTD of Live ShockVM.";

    private final HTML label = new HTML(WELCOME);
    private HTML vncApplet = new HTML();

    private Wizard newWizard = new NewMachineWizard();

    private final ShutdownMachineAsync shutdownMachineProxy = (ShutdownMachineAsync) GWT
            .create(ShutdownMachine.class);

    protected MainPage() {
        super("");
        getElement().getStyle().setPaddingLeft(3, Unit.EM);

        add(label);
    }

    public static MainPage getInstance() {
        if (instance == null)
            instance = new MainPage();

        return instance;
    }

    @Override
    public void onValueChange(ValueChangeEvent<String> event) {
        JS.restoreContainer();

        // Clear the page and show the new one
        clear();

        String historyToken = event.getValue();

        if (historyToken.equals(HistoryTokens.START)) {
            label.setHTML(WELCOME);
            add(label);
        }

        else if (historyToken.equals(HistoryTokens.NEWMACHINE)) {
            if (newWizard.hasFinished())
                newWizard = new NewMachineWizard();

            ((Widget) newWizard).setVisible(true);
            add((Widget) newWizard);
        }

        else if (historyToken.equals(HistoryTokens.PREBUILT))
            add(new PrebuiltWizard());

        else if (historyToken.equals(HistoryTokens.EXPORT))
            add(new ExportMachineWizard());

        History.newItem("", false);
    }

    public void showApplet(final MachineProcessInfo mpi, final boolean newWindow) {
        JS.restoreContainer();

        clear();

        add(vncApplet);

        vncApplet.getElement().setId("vncAppletContainer");

        vncApplet.setHTML("<h2>Viewing " + mpi.getMachineName() + " (" + mpi.getPid() + ")</h2>"
                + "<p><b>Warning:</b> if you can't connect and you're sure your machine is running, "
                + "click on disconnect a couple of times and then reconnect. This is a known bug of <b>websockify</b>.</p>"
                + "<div id=\"controls\"></div><div id=\"empty\"></div>");
        JS.showVNC("forse.v2.cs.unibo.it", String.valueOf(9000 + mpi.getVncServer()));
        //      JS.showVNC("192.168.0.202", "9091");

        //      vncApplet.setHTML("<h2>Viewing " + mpi.getMachineName() + " (" + mpi.getPid() + ")</h2>" +
        //            "<b>To shutdown this machine, freeing the VNC server, " +
        //            "please use the \"Shutdown this machine\" button positioned on the bottom of the page</b><br />" +
        //            "<applet code=\"VncViewer.class\" archive=\"VncViewer.jar\" width=\"800\" height=\"600\">" +
        //            "<param name=\"port\" value=\"" + (5900+mpi.getVncServer()) + "\"/>" +
        //            "<param name=\"open new window\" value=\"" + (newWindow? "yes" : "no") + "\"/>" +
        //            "<param name=\"view only\" value=\"" + (mpi.isOwned()? "no" : "yes") + "\"/>" +
        //            "</applet>");
        final Button shutdown = new Button("Shutdown this machine");
        add(shutdown);

        shutdown.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                shutdownMachineProxy.shutdownMachine(mpi, new AsyncCallback<Void>() {

                    @Override
                    public void onSuccess(Void result) {
                        JS.restoreContainer();
                        vncApplet.setHTML("<h2>Thank you</h2><span style=\"color: green\">"
                                + "Machine successfully shut down.</span>");
                        remove(shutdown);
                    }

                    @Override
                    public void onFailure(Throwable caught) {
                        Window.alert(caught.getMessage());
                    }
                });
            }
        });
    }
}