BreadcrumbsPresenter.java

/*
 * Copyright 2011 ArcBees 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.gwtplatform.samples.mobile.client.application.breadcrumbs;

import javax.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.ProxyStandard;
import com.gwtplatform.mvp.client.presenter.slots.NestedSlot;
import com.gwtplatform.mvp.client.proxy.PlaceManager;
import com.gwtplatform.mvp.client.proxy.Proxy;

/**
 * This is the top-level presenter of the hierarchy. Other presenters reveal themselves within this presenter. This
 * presenter display a breadcrumbs with the titles of the previously visited pages.
 */
public class BreadcrumbsPresenter extends Presenter<BreadcrumbsPresenter.MyView, BreadcrumbsPresenter.MyProxy> {
    /**
     * {@link BreadcrumbsPresenter}'s proxy.
     */
    @ProxyStandard
    public interface MyProxy extends Proxy<BreadcrumbsPresenter> {
    }

    /**
     * {@link BreadcrumbsPresenter}'s view.
     */
    public interface MyView extends View {
        void clearBreadcrumbs(int breadcrumbSize);

        void setBreadcrumbs(int index, String title);
    }

    /**
     * Use this in leaf presenters, inside their {@link #revealInParent} method.
     */
    public static final NestedSlot SLOT_MAIN_CONTENT = new NestedSlot();

    private final PlaceManager placeManager;

    @Inject
    BreadcrumbsPresenter(
            EventBus eventBus,
            MyView view,
            MyProxy proxy,
            PlaceManager placeManager) {
        super(eventBus, view, proxy, RevealType.Root);

        this.placeManager = placeManager;
    }

    @Override
    protected void onReset() {
        super.onReset();

        int size = placeManager.getHierarchyDepth();
        getView().clearBreadcrumbs(size);
        for (int i = 0; i < size; ++i) {
            getView().setBreadcrumbs(i, "Depth " + i);
        }
    }
}