AudioMediaSwitcher.java

/*****************************************************************************
 * AudioMediaSwitcher.java
 *****************************************************************************
 * Copyright © 2011-2014 VLC authors and VideoLAN
 *
 * 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.
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

package org.videolan.vlc.widget;

import org.videolan.vlc.PlaybackService;

import android.content.Context;
import android.graphics.Bitmap;
import android.util.AttributeSet;
import android.view.LayoutInflater;


public abstract class AudioMediaSwitcher extends FlingViewGroup {

    private AudioMediaSwitcherListener mAudioMediaSwitcherListener;

    private boolean hasPrevious;
    private int previousPosition;

    public AudioMediaSwitcher(Context context, AttributeSet attrs) {
        super(context, attrs);

        setOnViewSwitchedListener(mViewSwitchListener);
    }

    public void updateMedia(PlaybackService service) {
        removeAllViews();

        hasPrevious = false;
        previousPosition = 0;

        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (service.hasPrevious()) {
            addMediaView(inflater,
                    service.getTitlePrev(),
                    service.getArtistPrev(),
                    service.getCoverPrev());
            hasPrevious = true;
        }
        if (service.hasMedia())
            addMediaView(inflater,
                    service.getTitle(),
                    service.getArtist(),
                    service.getCover());
        if (service.hasNext())
            addMediaView(inflater,
                    service.getTitleNext(),
                    service.getArtistNext(),
                    service.getCoverNext());

        if (service.hasPrevious() && service.hasMedia()) {
            previousPosition = 1;
            scrollTo(1);
        }
        else
            scrollTo(0);
    }

    protected abstract void addMediaView(LayoutInflater inflater, String title, String artist, Bitmap cover);

    private final ViewSwitchListener mViewSwitchListener = new ViewSwitchListener() {

        @Override
        public void onSwitching(float progress) {
            if (mAudioMediaSwitcherListener != null)
                mAudioMediaSwitcherListener.onMediaSwitching();
        }

        @Override
        public void onSwitched(int position) {
            if (mAudioMediaSwitcherListener != null)
            {
                if (previousPosition != position) {
                    if (position == 0 && hasPrevious)
                        mAudioMediaSwitcherListener.onMediaSwitched(AudioMediaSwitcherListener.PREVIOUS_MEDIA);
                    if (position == 1 && !hasPrevious)
                        mAudioMediaSwitcherListener.onMediaSwitched(AudioMediaSwitcherListener.NEXT_MEDIA);
                    else if (position == 2)
                        mAudioMediaSwitcherListener.onMediaSwitched(AudioMediaSwitcherListener.NEXT_MEDIA);
                    previousPosition = position;
                }
                else
                    mAudioMediaSwitcherListener.onMediaSwitched(AudioMediaSwitcherListener.CURRENT_MEDIA);
            }
        }

        @Override
        public void onTouchDown() {
            if (mAudioMediaSwitcherListener != null)
                mAudioMediaSwitcherListener.onTouchDown();
        }

        @Override
        public void onTouchUp() {
            if (mAudioMediaSwitcherListener != null)
                mAudioMediaSwitcherListener.onTouchUp();
        }

        @Override
        public void onTouchClick() {
            if (mAudioMediaSwitcherListener != null)
                mAudioMediaSwitcherListener.onTouchClick();
        }

        @Override
        public void onBackSwitched() {}
    };

    public void setAudioMediaSwitcherListener(AudioMediaSwitcherListener l) {
        mAudioMediaSwitcherListener = l;
    }

    public static interface AudioMediaSwitcherListener {
        public final static int PREVIOUS_MEDIA = 1;
        public final static int CURRENT_MEDIA = 2;
        public final static int NEXT_MEDIA = 3;

        void onMediaSwitching();

        void onMediaSwitched(int position);

        void onTouchDown();

        void onTouchUp();

        void onTouchClick();
    }
}