Android Open Source - pixel-art Vertical Seek Bar

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License

The source code is released under:
Apache License
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Java Source Code

package com.tokaracamara.android.verticalslidevar;
/*  w ww  . j a  v a  2s .  co  m*/
import android.content.Context;
import android.util.AttributeSet;

import com.jaween.pixelart.util.AbsVerticalSeekBar;


/**
 * A SeekBar is an extension of ProgressBar that adds a draggable thumb. The user can touch
 * the thumb and drag left or right to set the current progress level or use the arrow keys.
 * Placing focusable widgets to the left or right of a SeekBar is discouraged.
 * <p>
 * Clients of the SeekBar can attach a {@link SeekBar.OnSeekBarChangeListener} to
 * be notified of the user's actions.
 *
 * @attr ref android.R.styleable#SeekBar_thumb
 */
public class VerticalSeekBar extends AbsVerticalSeekBar {

    /**
     * A callback that notifies clients when the progress level has been
     * changed. This includes changes that were initiated by the user through a
     * touch gesture or arrow key/trackball as well as changes that were initiated
     * programmatically.
     */
    public interface OnSeekBarChangeListener {

        /**
         * Notification that the progress level has changed. Clients can use the fromUser parameter
         * to distinguish user-initiated changes from those that occurred programmatically.
         *
         * @param seekBar The SeekBar whose progress has changed
         * @param progress The current progress level. This will be in the range 0..max where max
         *        was set by {@link ProgressBar#setMax(int)}. (The default value for max is 100.)
         * @param fromUser True if the progress change was initiated by the user.
         */
        void onProgressChanged(VerticalSeekBar seekBar, int progress, boolean fromUser);

        /**
         * Notification that the user has started a touch gesture. Clients may want to use this
         * to disable advancing the seekbar.
         * @param seekBar The SeekBar in which the touch gesture began
         */
        void onStartTrackingTouch(VerticalSeekBar seekBar);

        /**
         * Notification that the user has finished a touch gesture. Clients may want to use this
         * to re-enable advancing the seekbar.
         * @param seekBar The SeekBar in which the touch gesture began
         */
        void onStopTrackingTouch(VerticalSeekBar seekBar);
    }

    private OnSeekBarChangeListener mOnSeekBarChangeListener;

    public VerticalSeekBar(Context context) {
        this(context, null);
    }

    public VerticalSeekBar(Context context, AttributeSet attrs) {
        this(context, attrs, android.R.attr.seekBarStyle);
    }

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

    @Override
    protected void onProgressRefresh(float scale, boolean fromUser) {
        super.onProgressRefresh(scale, fromUser);

        if (mOnSeekBarChangeListener != null) {
            mOnSeekBarChangeListener.onProgressChanged(this, getProgress(), fromUser);
        }
    }

    /**
     * Sets a listener to receive notifications of changes to the SeekBar's progress level. Also
     * provides notifications of when the user starts and stops a touch gesture within the SeekBar.
     *
     * @param l The seek bar notification listener
     *
     * @see SeekBar.OnSeekBarChangeListener
     */
    public void setOnSeekBarChangeListener(OnSeekBarChangeListener l) {
        mOnSeekBarChangeListener = l;
    }

    @Override
    protected void onStartTrackingTouch() {
        if (mOnSeekBarChangeListener != null) {
            mOnSeekBarChangeListener.onStartTrackingTouch(this);
        }
    }

    @Override
    protected void onStopTrackingTouch() {
        if (mOnSeekBarChangeListener != null) {
            mOnSeekBarChangeListener.onStopTrackingTouch(this);
        }
    }

}
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