LogScrollView.java

/*
 * Copyright (C) 2012 Tobias Brunner
 * Copyright (C) 2012 Giuliano Grassi
 * Copyright (C) 2012 Ralf Sager
 * Hochschule fuer Technik Rapperswil
 *
 * This program 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 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * 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 General Public License
 * for more details.
 */

package org.strongswan.android.ui;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ScrollView;

public class LogScrollView extends ScrollView
{
	private boolean mAutoScroll = true;

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

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

	public LogScrollView(Context context, AttributeSet attrs, int defStyle)
	{
		super(context, attrs, defStyle);
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev)
	{
		/* disable auto-scrolling when the user starts scrolling around */
		if (ev.getActionMasked() == MotionEvent.ACTION_DOWN)
		{
			mAutoScroll = false;
		}
		return super.onTouchEvent(ev);
	}

	/**
	 * Call this to move newly added content into view by scrolling to the bottom.
	 * Nothing happens if auto-scrolling is disabled.
	 */
	public void autoScroll()
	{
		if (mAutoScroll)
		{
			fullScroll(View.FOCUS_DOWN);
		}
	}

	@Override
	protected void onScrollChanged(int l, int t, int oldl, int oldt)
	{
		super.onScrollChanged(l, t, oldl, oldt);
		/* if the user scrolls to the bottom we enable auto-scrolling again */
		if (t == getChildAt(getChildCount() - 1).getHeight() - getHeight())
		{
			mAutoScroll = true;
		}
	}
}