/*  _____ _
 * |_   _| |_  _ _ ___ ___ _ __  __ _
 *   | | | ' \| '_/ -_) -_) '  \/ _` |_
 *   |_| |_||_|_| \___\___|_|_|_\__,_(_)
 *
 * Threema for Android
 * Copyright (c) 2013-2020 Threema GmbH
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

package ch.threema.app.ui;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ListView;

public final class ConversationListView extends ListView {

	public ConversationListView(Context context) {
		super(context);
	}

	public ConversationListView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	private boolean isLastItemVisible() {
		// returns true if the last item in this list view is visible
		final int lastPos = getLastVisiblePosition();
		final int countPos = getCount();

		return (lastPos == countPos - 1);
	}

	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		// called when size of view changes (e.g. soft keyboard appears or screen is rotated)
		super.onSizeChanged(w, h, oldw, oldh);

		if (isLastItemVisible()) {
			// only scroll to end of list if last item is visible - otherwise stay put
		    setSelection(Integer.MAX_VALUE);
		}
	}

}
