VerticalSeekBar.java

/*
The contents of this file are subject to the Mozilla Public License
Version 1.1 (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.mozilla.org/MPL/

Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
License for the specific language governing rights and limitations
under the License.

The Original Code is collection of files collectively known as Open Camera.

The Initial Developer of the Original Code is Almalence Inc.
Portions created by Initial Developer are Copyright (C) 2013 
by Almalence Inc. All Rights Reserved.
 */

package com.almalence.ui;

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.SeekBar;

/***
 * VerticalSeekBar - implements vertical seekbar control
 ***/
public class VerticalSeekBar extends SeekBar
{

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

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

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

	protected void onSizeChanged(int w, int h, int oldw, int oldh)
	{
		super.onSizeChanged(h, w, oldh, oldw);
	}

	@Override
	protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
	{
		super.onMeasure(heightMeasureSpec, widthMeasureSpec);
		setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
	}

	protected void onDraw(Canvas c)
	{
		c.rotate(-90);
		c.translate(-getHeight(), 0);
		super.onDraw(c);
	}

	private OnSeekBarChangeListener	onChangeListener;

	@Override
	public void setOnSeekBarChangeListener(OnSeekBarChangeListener onChangeListener)
	{
		this.onChangeListener = onChangeListener;
	}

	private int	lastProgress	= 0;

	@Override
	public boolean onTouchEvent(MotionEvent event)
	{
		if (!isEnabled())
		{
			return false;
		}

		switch (event.getAction())
		{
		case MotionEvent.ACTION_DOWN:
			onChangeListener.onStartTrackingTouch(this);
			setPressed(true);
			setSelected(true);
			break;
		case MotionEvent.ACTION_MOVE:
			super.onTouchEvent(event);
			int progress = getMax() - (int) (getMax() * event.getY() / getHeight());

			// Ensure progress stays within boundaries
			if (progress < 0)
				progress = 0;
			if (progress > getMax())
				progress = getMax();
			setProgress(progress); // Draw progress
			if (progress != lastProgress)
			{
				// Only enact listener if the progress has actually changed
				lastProgress = progress;
				onChangeListener.onProgressChanged(this, progress, true);
			}

			onSizeChanged(getWidth(), getHeight(), 0, 0);
			setPressed(true);
			setSelected(true);
			break;
		case MotionEvent.ACTION_UP:
			onChangeListener.onStopTrackingTouch(this);
			setPressed(false);
			setSelected(false);
			break;
		case MotionEvent.ACTION_CANCEL:
			super.onTouchEvent(event);
			setPressed(false);
			setSelected(false);
			break;
		default:
			break;
		}
		return true;
	}

	public synchronized void setProgressAndThumb(int progress)
	{
		setProgress(progress);
		onSizeChanged(getWidth(), getHeight(), 0, 0);
		if (progress != lastProgress)
		{
			// Only enact listener if the progress has actually changed
			lastProgress = progress;
			
			// Just update UI. This change caused programmaticaly, not by user.
			onChangeListener.onProgressChanged(this, progress, false);
		}
	}

	public synchronized void setMaximum(int maximum)
	{
		setMax(maximum);
	}

	public synchronized int getMaximum()
	{
		return getMax();
	}
}