nz.co.doltech.gwtjui.demo.client.application.ApplicationPresenter.java Source code

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/*
 * Copyright 2015 Doltech Systems Ltd.
 *
 * 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 nz.co.doltech.gwtjui.demo.client.application;

import com.google.gwt.core.client.Scheduler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.Window;
import com.google.inject.Inject;
import com.google.web.bindery.event.shared.EventBus;
import com.gwtplatform.mvp.client.Presenter;
import com.gwtplatform.mvp.client.View;
import com.gwtplatform.mvp.client.annotations.ContentSlot;
import com.gwtplatform.mvp.client.annotations.ProxyStandard;
import com.gwtplatform.mvp.client.proxy.Proxy;
import com.gwtplatform.mvp.client.proxy.RevealContentHandler;

/**
 * @author Ben Dol
 */
public class ApplicationPresenter extends Presenter<ApplicationPresenter.MyView, ApplicationPresenter.MyProxy> {

    @ProxyStandard
    public interface MyProxy extends Proxy<ApplicationPresenter> {
    }

    public interface MyView extends View {
    }

    /**
     * Use this in leaf presenters, inside their {@link #revealInParent} method.
     */
    @ContentSlot
    public static final GwtEvent.Type<RevealContentHandler<?>> TYPE_SetMainContent = new GwtEvent.Type<>();

    @Inject
    ApplicationPresenter(final EventBus eventBus, final MyView view, final MyProxy proxy) {
        super(eventBus, view, proxy, RevealType.Root);

        // Making the window scroll to top on every page change
        History.addValueChangeHandler(new ValueChangeHandler<String>() {
            @Override
            public void onValueChange(ValueChangeEvent<String> event) {
                Scheduler.get().scheduleDeferred(new Command() {
                    @Override
                    public void execute() {
                        Window.scrollTo(0, 0);
                    }
                });
            }
        });
    }
}