org.rest.client.activity.AboutActivity.java Source code

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Here is the source code for org.rest.client.activity.AboutActivity.java

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/*******************************************************************************
 * Copyright 2012 Pawe Pszty
 * 
 * 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 org.rest.client.activity;

import org.rest.client.ClientFactory;
import org.rest.client.RestClient;
import org.rest.client.place.AboutPlace;
import org.rest.client.tutorial.TutorialFactory;
import org.rest.client.ui.AboutView;

import com.allen_sauer.gwt.log.client.Log;
import com.google.gwt.chrome.def.BackgroundPageCallback;
import com.google.gwt.chrome.runtime.ManifestDetails;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONValue;
import com.google.gwt.user.client.ui.AcceptsOneWidget;
import com.google.web.bindery.event.shared.EventBus;

/**
 * Activities typically restore state ("wake up"), perform initialization
 * ("set up"), and load a corresponding UI ("show up")
 * 
 * @author Pawe Pszty
 * 
 */
public class AboutActivity extends AppActivity implements AboutView.Presenter {

    final private AboutPlace place;
    private EventBus eventBus;
    AboutView view = null;
    TutorialFactory tutorialFactory = null;

    public AboutActivity(AboutPlace place, ClientFactory clientFactory) {
        super(clientFactory);
        this.place = place;
    }

    @Override
    public void start(AcceptsOneWidget panel, com.google.gwt.event.shared.EventBus eventBus) {
        this.eventBus = eventBus;
        super.start(panel, eventBus);

        view = clientFactory.getAboutView();
        view.setPresenter(this);
        panel.setWidget(view.asWidget());
        getAppVersion();
        initPlusOne();
        activateTutorial();

        if (place.getToken().equals("donate")) {
            view.showDonateDialog();
        }
    }

    @Override
    public String mayStop() {
        if (tutorialFactory != null) {
            tutorialFactory.clear();
        }
        return null;
    }

    private void getAppVersion() {
        clientFactory.getChromeMessagePassing().postMessage("getManifest", "", new BackgroundPageCallback() {

            @Override
            public void onSuccess(String result) {
                try {
                    JSONValue value = JSONParser.parseStrict(result);
                    ManifestDetails manifest = value.isObject().getJavaScriptObject().cast();
                    if (view != null) {
                        view.setManifest(manifest);
                    } else {
                        if (RestClient.isDebug()) {
                            Log.warn("View is null. cant set manifest data.");
                        }
                    }
                } catch (Exception e) {
                    if (RestClient.isDebug()) {
                        Log.warn("Can't parse manifest info", e);
                    }
                }

            }

            @Override
            public void onError(String message) {
                if (RestClient.isDebug()) {
                    Log.error("Unknown error occured: " + message);
                }
            }
        });
    }

    private void activateTutorial() {
        tutorialFactory = new TutorialFactory("about");

        if (!tutorialFactory.canStartTutorial()) {
            return;
        }
        view.setUpTutorial(tutorialFactory);
    }

    void initPlusOne() {
        if (!isPlusLoaded()) {
            loadPlus();
        } else {
            _initPlusOneButton();
        }
    }

    private final native boolean isPlusLoaded()/*-{
                                               return !!($wnd.gapi);
                                               }-*/;

    private final native void loadPlus()/*-{
                                        $wnd.loadPlusApi();
                                        }-*/;

    private final native void _initPlusOneButton()/*-{
                                                  try{
                                                  $wnd.gapi.plusone.go();
                                                  } catch(e){
                                                  window.console.error(e);
                                                  }
                                                  }-*/;
}