/*
 * Copyright (C) Stichting Akvo (Akvo Foundation)
 *
 * This file is part of Akvo Caddisfly.
 *
 * Akvo Caddisfly is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Akvo Caddisfly is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Akvo Caddisfly. If not, see <http://www.gnu.org/licenses/>.
 */

package org.akvo.caddisfly.util;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.ListView;

/**
 * Utility functions for ListView manipulation.
 */
public final class ListViewUtil {

    private ListViewUtil() {
    }

    /**
     * Set the ListView height based on the number of rows and their height
     * <p/>
     * Height for ListView needs to be set if used as a child of another ListView.
     * The child ListView will not display any scrollbars so the height needs to be
     * set so that all the rows are visible
     *
     * @param listView    the list view
     * @param extraHeight extra bottom padding
     */
    @SuppressWarnings("SameParameterValue")
    public static void setListViewHeightBasedOnChildren(ListView listView, int extraHeight) {
        ListAdapter listAdapter = listView.getAdapter();
        if (listAdapter == null) {
            // pre-condition
            return;
        }

        int totalHeight = 0;
        for (int i = 0; i < listAdapter.getCount(); i++) {
            View listItem = listAdapter.getView(i, null, listView);
            listItem.measure(0, 0);
            totalHeight += listItem.getMeasuredHeight();
        }

        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = extraHeight + totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1));
        listView.setLayoutParams(params);
    }
}
