1 files changed, 129 insertions, 0 deletions
diff --git a/app/src/main/java/de/danoeh/antennapod/view/ChapterSeekBar.java b/app/src/main/java/de/danoeh/antennapod/view/ChapterSeekBar.java
new file mode 100644
index 000000000..5e80198d5
--- /dev/null
+++ b/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);
+    }
+}