org.solovyev.android.sherlock.ActionBarNavigationFragmentListener.java Source code

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Here is the source code for org.solovyev.android.sherlock.ActionBarNavigationFragmentListener.java

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/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Contact details
 *
 * Email: se.solovyev@gmail.com
 * Site:  http://se.solovyev.org
 */

package org.solovyev.android.sherlock;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import org.solovyev.android.list.ListAdapter;

import javax.annotation.Nonnull;
import java.util.List;

/**
 * User: serso
 * Date: 8/7/12
 * Time: 12:01 PM
 */
public class ActionBarNavigationFragmentListener<T extends Fragment> implements ActionBar.OnNavigationListener {

    @Nonnull
    private final SherlockFragmentActivity activity;

    @Nonnull
    private List<? extends FragmentItem> items;

    private int selected = -1;

    @Nonnull
    private ListAdapter<String> adapter;

    public ActionBarNavigationFragmentListener(@Nonnull SherlockFragmentActivity activity,
            @Nonnull List<? extends FragmentItem> items, @Nonnull List<String> itemLabels) {
        assert items.size() == itemLabels.size();
        this.activity = activity;
        this.items = items;
        this.adapter = AndroidSherlockUtils.newSherlockDefaultAdapter(activity, itemLabels);
    }

    @Nonnull
    public synchronized ListAdapter getAdapter() {
        return adapter;
    }

    @Override
    public boolean onNavigationItemSelected(int itemPosition, long itemId) {
        final FragmentManager fragmentManager = this.activity.getSupportFragmentManager();

        final FragmentTransaction ft = fragmentManager.beginTransaction();
        try {
            if (selected != itemPosition) {
                if (selected >= 0 && selected < items.size()) {
                    items.get(selected).onUnselected(ft);
                }

                if (itemPosition < items.size()) {
                    items.get(itemPosition).onSelected(ft);
                    selected = itemPosition;
                }
            }
        } finally {
            if (ft != null && !ft.isEmpty()) {
                ft.commit();
            }
        }

        return true;
    }
}