Chapter dividers for the progress bar (#4915)

app/src/main/java/de/danoeh/antennapod/fragment/AudioPlayerFragment.java

@@ -29,6 +29,7 @@ import de.danoeh.antennapod.activity.CastEnabledActivity;
 import de.danoeh.antennapod.activity.MainActivity;
 import de.danoeh.antennapod.core.event.FavoritesEvent;
 import de.danoeh.antennapod.core.event.PlaybackPositionEvent;
+import de.danoeh.antennapod.core.feed.Chapter;
 import de.danoeh.antennapod.core.event.UnreadItemsUpdateEvent;
 import de.danoeh.antennapod.core.feed.FeedItem;
 import de.danoeh.antennapod.core.feed.FeedMedia;
@@ -46,6 +47,7 @@ import de.danoeh.antennapod.dialog.SkipPreferenceDialog;
 import de.danoeh.antennapod.dialog.SleepTimerDialog;
 import de.danoeh.antennapod.dialog.VariableSpeedDialog;
 import de.danoeh.antennapod.menuhandler.FeedItemMenuHandler;
+import de.danoeh.antennapod.view.ChapterSeekBar;
 import de.danoeh.antennapod.ui.common.PlaybackSpeedIndicatorView;
 import io.reactivex.Maybe;
 import io.reactivex.android.schedulers.AndroidSchedulers;
@@ -63,7 +65,7 @@ import java.util.List;
  * Shows the audio player.
  */
 public class AudioPlayerFragment extends Fragment implements
-        SeekBar.OnSeekBarChangeListener, Toolbar.OnMenuItemClickListener {
+        ChapterSeekBar.OnSeekBarChangeListener, Toolbar.OnMenuItemClickListener {
     public static final String TAG = "AudioPlayerFragment";
     private static final int POS_COVER = 0;
     private static final int POS_DESCR = 1;
@@ -77,7 +79,7 @@ public class AudioPlayerFragment extends Fragment implements
     private ViewPager2 pager;
     private TextView txtvPosition;
     private TextView txtvLength;
-    private SeekBar sbPosition;
+    private ChapterSeekBar sbPosition;
     private ImageButton butRev;
     private TextView txtvRev;
     private ImageButton butPlay;
@@ -172,12 +174,33 @@ public class AudioPlayerFragment extends Fragment implements
         return root;
     }
 
-    public void setHasChapters(boolean hasChapters) {
+    private void setHasChapters(boolean hasChapters) {
         this.hasChapters = hasChapters;
         tabLayoutMediator.detach();
         tabLayoutMediator.attach();
     }
 
+    private void setChapterDividers(Playable media) {
+
+        if (media == null) {
+            return;
+        }
+
+        float[] dividerPos = null;
+
+        if (hasChapters) {
+            List<Chapter> chapters = media.getChapters();
+            dividerPos = new float[chapters.size()];
+            float duration = media.getDuration();
+
+            for (int i = 0; i < chapters.size(); i++) {
+                dividerPos[i] = chapters.get(i).getStart() / duration;
+            }
+        }
+        
+        sbPosition.setDividerPos(dividerPos);
+    }
+
     public View getExternalPlayerHolder() {
         return getView().findViewById(R.id.playerFragment);
     }
@@ -298,6 +321,7 @@ public class AudioPlayerFragment extends Fragment implements
         disposable = Maybe.create(emitter -> {
             Playable media = controller.getMedia();
             if (media != null) {
+                media.loadChapterMarks(getContext());
                 emitter.onSuccess(media);
             } else {
                 emitter.onComplete();
@@ -389,8 +413,15 @@ public class AudioPlayerFragment extends Fragment implements
         if (controller == null) {
             return;
         }
+
+        if (media != null && media.getChapters() != null) {
+            setHasChapters(media.getChapters().size() > 0);
+        } else {
+            setHasChapters(false);
+        }
         updatePosition(new PlaybackPositionEvent(controller.getPosition(), controller.getDuration()));
         updatePlaybackSpeedButton(media);
+        setChapterDividers(media);
         setupOptionsMenu(media);
     }
 

app/src/main/java/de/danoeh/antennapod/fragment/ChaptersFragment.java

@@ -137,7 +137,6 @@ public class ChaptersFragment extends Fragment {
             return;
         }
         adapter.setMedia(media);
-        ((AudioPlayerFragment) getParentFragment()).setHasChapters(adapter.getItemCount() > 0);
         int positionOfCurrentChapter = getCurrentChapter(media);
         updateChapterSelection(positionOfCurrentChapter);
     }

app/src/main/java/de/danoeh/antennapod/view/ChapterSeekBar.java

@@ -0,0 +1,129 @@
+package de.danoeh.antennapod.view;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.util.AttributeSet;
+import de.danoeh.antennapod.ui.common.ThemeUtils;
+
+public class ChapterSeekBar extends androidx.appcompat.widget.AppCompatSeekBar {
+
+    private float top;
+    private float width;
+    private float bottom;
+    private float density;
+    private float progressPrimary;
+    private float progressSecondary;
+    private float[] dividerPos;
+    private final Paint paintBackground = new Paint();
+    private final Paint paintProgressPrimary = new Paint();
+    private final Paint paintProgressSecondary = new Paint();
+
+    public ChapterSeekBar(Context context) {
+        super(context);
+        init(context);
+    }
+
+    public ChapterSeekBar(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context);
+    }
+
+    public ChapterSeekBar(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        init(context);
+    }
+
+    private void init(Context context) {
+        setBackground(null); // Removes the thumb shadow
+        dividerPos = null;
+        density = context.getResources().getDisplayMetrics().density;
+        paintBackground.setColor(ThemeUtils.getColorFromAttr(getContext(),
+                de.danoeh.antennapod.core.R.attr.currently_playing_background));
+        paintBackground.setAlpha(128);
+        paintProgressPrimary.setColor(ThemeUtils.getColorFromAttr(getContext(),
+                de.danoeh.antennapod.core.R.attr.colorPrimary));
+        paintProgressSecondary.setColor(ThemeUtils.getColorFromAttr(getContext(),
+                de.danoeh.antennapod.core.R.attr.seek_background));
+    }
+
+    /**
+     * Sets the relative positions of the chapter dividers.
+     * @param dividerPos of the chapter dividers relative to the duration of the media.
+     */
+    public void setDividerPos(final float[] dividerPos) {
+        if (dividerPos != null) {
+            this.dividerPos = new float[dividerPos.length + 2];
+            this.dividerPos[0] = 0;
+            System.arraycopy(dividerPos, 0, this.dividerPos, 1, dividerPos.length);
+            this.dividerPos[this.dividerPos.length - 1] = 1;
+        } else {
+            this.dividerPos = null;
+        }
+    }
+
+    @Override
+    protected synchronized void onDraw(Canvas canvas) {
+        top = getTop() + density * 7.5f;
+        bottom = getBottom() - density * 7.5f;
+        width = (float) (getRight() - getPaddingRight() - getLeft() - getPaddingLeft());
+        progressSecondary = getSecondaryProgress() / (float) getMax() * width;
+        progressPrimary = getProgress() / (float) getMax() * width;
+
+        if (dividerPos == null) {
+            drawProgress(canvas);
+        } else {
+            drawProgressChapters(canvas);
+        }
+        drawThumb(canvas);
+    }
+
+    private void drawProgress(Canvas canvas) {
+        final int saveCount = canvas.save();
+        canvas.translate(getPaddingLeft(), getPaddingTop());
+        canvas.drawRect(0, top, width, bottom, paintBackground);
+        canvas.drawRect(0, top, progressSecondary, bottom, paintProgressSecondary);
+        canvas.drawRect(0, top, progressPrimary, bottom, paintProgressPrimary);
+        canvas.restoreToCount(saveCount);
+    }
+
+    private void drawProgressChapters(Canvas canvas) {
+        final int saveCount = canvas.save();
+        int currChapter = 1;
+        float chapterMargin = density * 0.6f;
+        float topExpanded = getTop() + density * 7;
+        float bottomExpanded = getBottom() - density * 7;
+
+        canvas.translate(getPaddingLeft(), getPaddingTop());
+
+        for (int i = 1; i < dividerPos.length; i++) {
+            float right = dividerPos[i] * width - chapterMargin;
+            float left = dividerPos[i - 1] * width + chapterMargin;
+            float rightCurr = dividerPos[currChapter] * width - chapterMargin;
+            float leftCurr = dividerPos[currChapter - 1] * width + chapterMargin;
+
+            canvas.drawRect(left, top, right, bottom, paintBackground);
+
+            if (right < progressPrimary) {
+                currChapter = i + 1;
+                canvas.drawRect(left, top, right, bottom, paintProgressPrimary);
+            } else if (isPressed()) {
+                canvas.drawRect(leftCurr, topExpanded, rightCurr, bottomExpanded, paintBackground);
+                canvas.drawRect(leftCurr, topExpanded, progressPrimary, bottomExpanded, paintProgressPrimary);
+            } else {
+                if (progressSecondary > leftCurr) {
+                    canvas.drawRect(leftCurr, top, progressSecondary, bottom, paintProgressSecondary);
+                }
+                canvas.drawRect(leftCurr, top, progressPrimary, bottom, paintProgressPrimary);
+            }
+        }
+        canvas.restoreToCount(saveCount);
+    }
+
+    private void drawThumb(Canvas canvas) {
+        final int saveCount = canvas.save();
+        canvas.translate(getPaddingLeft() - getThumbOffset(), getPaddingTop());
+        getThumb().draw(canvas);
+        canvas.restoreToCount(saveCount);
+    }
+}

app/src/main/res/layout/audioplayer_fragment.xml

@@ -88,7 +88,7 @@
             android:layoutDirection="ltr"
             android:orientation="vertical">
 
-        <SeekBar
+        <de.danoeh.antennapod.view.ChapterSeekBar
                 android:id="@+id/sbPosition"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"