1 files changed, 105 insertions, 0 deletions
diff --git a/app/src/main/java/de/danoeh/antennapod/view/PagerIndicatorView.java b/app/src/main/java/de/danoeh/antennapod/view/PagerIndicatorView.java
new file mode 100644
index 000000000..60ef820a9
--- /dev/null
+++ b/app/src/main/java/de/danoeh/antennapod/view/PagerIndicatorView.java
@@ -0,0 +1,105 @@
+package de.danoeh.antennapod.view;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.database.DataSetObserver;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.util.AttributeSet;
+import android.view.View;
+import androidx.annotation.Nullable;
+import androidx.vectordrawable.graphics.drawable.ArgbEvaluator;
+import androidx.viewpager.widget.ViewPager;
+
+public class PagerIndicatorView extends View {
+    private final Paint paint = new Paint();
+    private float position = 0;
+    private int numPages = 0;
+    private int disabledPage = -1;
+    private int circleColor = 0;
+    private int circleColorHighlight = -1;
+
+    public PagerIndicatorView(Context context) {
+        super(context);
+        setup();
+    }
+
+    public PagerIndicatorView(Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+        setup();
+    }
+
+    public PagerIndicatorView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        setup();
+    }
+
+    private void setup() {
+        paint.setAntiAlias(true);
+        paint.setStyle(Paint.Style.FILL);
+
+        int[] colorAttrs = new int[] { android.R.attr.textColorSecondary };
+        TypedArray a = getContext().obtainStyledAttributes(colorAttrs);
+        circleColorHighlight = a.getColor(0, 0xffffffff);
+        circleColor = (Integer) new ArgbEvaluator().evaluate(0.8f, 0x00ffffff, circleColorHighlight);
+        a.recycle();
+    }
+
+    public void setViewPager(ViewPager pager) {
+        numPages = pager.getAdapter().getCount();
+        pager.getAdapter().registerDataSetObserver(new DataSetObserver() {
+            @Override
+            public void onChanged() {
+                numPages = pager.getAdapter().getCount();
+                invalidate();
+            }
+        });
+        pager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
+            @Override
+            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+                PagerIndicatorView.this.position = position + positionOffset;
+                invalidate();
+            }
+        });
+    }
+
+    public void setDisabledPage(int disabledPage) {
+        this.disabledPage = disabledPage;
+        invalidate();
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+
+        for (int i = 0; i < numPages; i++) {
+            if ((int) Math.floor(position) == i) {
+                // This is the current dot
+                drawCircle(canvas, i, (float) (1 - (position - Math.floor(position))));
+            } else if ((int) Math.ceil(position) == i) {
+                // This is the next dot
+                drawCircle(canvas, i, (float) (position - Math.floor(position)));
+            } else {
+                drawCircle(canvas, i, 0);
+            }
+        }
+    }
+
+    private void drawCircle(Canvas canvas, int position, float frac) {
+        float circleRadiusSmall = canvas.getHeight() * 0.26f;
+        float circleRadiusBig = canvas.getHeight() * 0.35f;
+        float circleRadiusDelta = (circleRadiusBig - circleRadiusSmall);
+        float start = 0.5f * (canvas.getWidth() - numPages * 1.5f * canvas.getHeight());
+        paint.setStrokeWidth(canvas.getHeight() * 0.3f);
+
+        if (position == disabledPage) {
+            paint.setStyle(Paint.Style.STROKE);
+        } else {
+            paint.setStyle(Paint.Style.FILL_AND_STROKE);
+        }
+
+        paint.setColor((Integer) new ArgbEvaluator().evaluate(frac, circleColor, circleColorHighlight));
+        canvas.drawCircle(start + (position * 1.5f + 0.75f) * canvas.getHeight(), 0.5f * canvas.getHeight(),
+                circleRadiusSmall + frac * circleRadiusDelta, paint);
+    }
+}
+\ No newline at end of file