edu.ycp.cs.netcoder.client.NetCoder_GWT2.java Source code

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Here is the source code for edu.ycp.cs.netcoder.client.NetCoder_GWT2.java

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// NetCoder - a web-based pedagogical programming environment
// Copyright (C) 2011, Jaime Spacco <jspacco@knox.edu>
// Copyright (C) 2011, David H. Hovemeyer <dhovemey@ycp.edu>
//
// This program 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.
//
// This program 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/>.

package edu.ycp.cs.netcoder.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.RootLayoutPanel;

import edu.ycp.cs.netcoder.shared.util.Publisher;
import edu.ycp.cs.netcoder.shared.util.Subscriber;
import edu.ycp.cs.netcoder.shared.util.SubscriptionRegistrar;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class NetCoder_GWT2 implements EntryPoint, Subscriber, ResizeHandler {
    // Client session data.
    private Session session;

    // Subscription registrar
    private SubscriptionRegistrar subscriptionRegistrar;

    // Currently-active NetCoderView.
    private NetCoderView currentView;

    /**
     * This is the entry point method.
     */
    public void onModuleLoad() {
        // Create session
        session = new Session();
        session.add(new WindowResizeNotifier());

        // Create a SubscriptionRegistrar
        subscriptionRegistrar = new DefaultSubscriptionRegistrar();

        // Observe Session changes
        session.subscribe(Session.Event.LOGIN, this, subscriptionRegistrar);
        session.subscribe(Session.Event.LOGOUT, this, subscriptionRegistrar);
        session.subscribe(Session.Event.PROBLEM_CHOSEN, this, subscriptionRegistrar);

        // Get window ResizeEvents so we can publish them to views
        Window.addResizeHandler(this);

        changeView(new LoginView(session));
    }

    @Override
    public void onResize(ResizeEvent event) {
        // Publish window ResizeEvent
        session.get(WindowResizeNotifier.class).notifySubscribers(WindowResizeNotifier.WINDOW_RESIZED, event);
    }

    public void changeView(NetCoderView view) {
        if (currentView != null) {
            currentView.deactivate();
            RootLayoutPanel.get().remove(currentView);
        }
        RootLayoutPanel.get().add(view);
        view.activate();
        currentView = view;
    }

    @Override
    public void eventOccurred(Object key, Publisher publisher, Object hint) {
        if (key == Session.Event.LOGIN) {
            changeView(new CourseAndProblemView(session));
        } else if (key == Session.Event.LOGOUT) {
            changeView(new LoginView(session));
        } else if (key == Session.Event.PROBLEM_CHOSEN) {
            changeView(new DevelopmentView(session));
        }
    }

    @Override
    public void unsubscribeFromAll() {
        session.unsubscribeFromAll(this);
    }
}