com.google.gwt.sample.mobilewebapp.client.activity.TaskActivity.java Source code

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Here is the source code for com.google.gwt.sample.mobilewebapp.client.activity.TaskActivity.java

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/*
 * Copyright 2011 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.mobilewebapp.client.activity;

import com.google.gwt.activity.shared.AbstractActivity;
import com.google.gwt.sample.mobilewebapp.client.ClientFactory;
import com.google.gwt.sample.mobilewebapp.client.event.TaskEditEvent;
import com.google.gwt.sample.mobilewebapp.presenter.task.TaskEditPresenter;
import com.google.gwt.sample.mobilewebapp.presenter.task.TaskPlace;
import com.google.gwt.sample.mobilewebapp.presenter.task.TaskReadPresenter;
import com.google.gwt.sample.mobilewebapp.shared.TaskProxy;
import com.google.gwt.sample.ui.client.PresentsWidgets;
import com.google.gwt.user.client.ui.AcceptsOneWidget;
import com.google.web.bindery.event.shared.ResettableEventBus;

/**
 * An activity that shows details on a particular task, and allows the user to
 * edit it.
 */
public class TaskActivity extends AbstractActivity {
    private PresentsWidgets presenter;

    private final TaskPlace place;

    private final ClientFactory clientFactory;

    private ResettableEventBus childEventBus;

    /**
     * Construct a new {@link TaskActivity}.
     * 
     * @param clientFactory the {@link ClientFactory} of shared resources
     * @param place configuration for this activity
     */
    public TaskActivity(ClientFactory clientFactory, TaskPlace place) {
        this.place = place;
        this.clientFactory = clientFactory;
    }

    @Override
    public String mayStop() {
        return presenter.mayStop();
    }

    @Override
    public void onCancel() {
        presenter.stop();
    }

    @Override
    public void onStop() {
        childEventBus.removeHandlers();
        presenter.stop();
    }

    public void start(final AcceptsOneWidget container, com.google.gwt.event.shared.EventBus eventBus) {
        this.childEventBus = new ResettableEventBus(eventBus);
        eventBus.addHandler(TaskEditEvent.TYPE, new TaskEditEvent.Handler() {
            @Override
            public void onTaskEdit(TaskEditEvent event) {
                // Stop the read presenter
                onStop();
                presenter = startEdit(event.getReadOnlyTask());
                container.setWidget(presenter);
            }
        });

        if (place.getTaskId() == null) {
            presenter = startCreate();
        } else {
            presenter = startDisplay(place);
        }
        container.setWidget(presenter);
    }

    private PresentsWidgets startCreate() {
        PresentsWidgets rtn = new TaskEditPresenter(clientFactory);
        rtn.start(childEventBus);
        return rtn;
    }

    private PresentsWidgets startDisplay(TaskPlace place) {
        PresentsWidgets rtn = new TaskReadPresenter(clientFactory, place);
        rtn.start(childEventBus);
        return rtn;
    }

    private PresentsWidgets startEdit(TaskProxy readOnlyTask) {
        PresentsWidgets rtn = new TaskEditPresenter(clientFactory, readOnlyTask);
        rtn.start(childEventBus);
        return rtn;
    }
}