VerticalSeekBar.java

/*
 * Copyright (C) 2015 Federico Iosue (federico.iosue@gmail.com)
 *
 * 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 3 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package it.feio.android.omninotes.models.views;

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


public class VerticalSeekBar extends SeekBar {

    protected OnSeekBarChangeListener changeListener;
    protected int x, y, z, w;


    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);
    }


    @Override
    protected synchronized void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(h, w, oldh, oldw);

        this.x = w;
        this.y = h;
        this.z = oldw;
        this.w = oldh;
    }


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


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

        super.onDraw(c);
    }


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

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                setSelected(true);
                setPressed(true);
                if (changeListener != null)
                    changeListener.onStartTrackingTouch(this);
                break;
            case MotionEvent.ACTION_UP:
                setSelected(false);
                setPressed(false);
                if (changeListener != null)
                    changeListener.onStopTrackingTouch(this);
                break;
            case MotionEvent.ACTION_MOVE:
                int progress = getMax()
                        - (int) (getMax() * event.getY() / getHeight());
                setProgress(progress);
                onSizeChanged(getWidth(), getHeight(), 0, 0);
                if (changeListener != null)
                    changeListener.onProgressChanged(this, progress, true);
                break;

            case MotionEvent.ACTION_CANCEL:
                break;
        }
        return true;
    }


    @Override
    public synchronized void setOnSeekBarChangeListener(
            OnSeekBarChangeListener listener) {
        changeListener = listener;
    }


    @Override
    public synchronized void setProgress(int progress) {
        if (progress >= 0)
            super.setProgress(progress);

        else
            super.setProgress(0);
        onSizeChanged(x, y, z, w);
        if (changeListener != null)
            changeListener.onProgressChanged(this, progress, false);
    }
}