7/n: Add enrollment animation

Fixes: 112005540

Test: Tested with ag/4749121

Change-Id: I7d51187f7b8b7a6c2c34c984740b76bc9fd89262

src/com/android/settings/biometrics/face/FaceEnrollAnimationDrawable.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.biometrics.face;
 
+import android.animation.TimeAnimator;
+import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.ColorFilter;
@@ -26,16 +28,43 @@ import android.graphics.PorterDuffXfermode;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 
-/**
- * A drawable containing the circle cutout.
- */
-public class FaceEnrollAnimationDrawable extends Drawable {
+import com.android.settings.biometrics.BiometricEnrollSidecar;
 
+/**
+ * A drawable containing the circle cutout as well as the animations.
+ */
+public class FaceEnrollAnimationDrawable extends Drawable
+        implements BiometricEnrollSidecar.Listener {
+
+    // Tune this parameter so the UI looks nice - and so that we don't have to draw the animations
+    // outside our bounds. A fraction of each rotating dot should be overlapping the camera preview.
+    private static final int BORDER_BOUNDS = 20;
+
+    private final Context mContext;
+    private final ParticleCollection.Listener mListener;
     private Rect mBounds;
     private final Paint mSquarePaint;
     private final Paint mCircleCutoutPaint;
 
-    public FaceEnrollAnimationDrawable() {
+    private ParticleCollection mParticleCollection;
+
+    private TimeAnimator mTimeAnimator;
+
+    private final ParticleCollection.Listener mAnimationListener
+            = new ParticleCollection.Listener() {
+        @Override
+        public void onEnrolled() {
+            if (mTimeAnimator != null && mTimeAnimator.isStarted()) {
+                mTimeAnimator.end();
+                mListener.onEnrolled();
+            }
+        }
+    };
+
+    public FaceEnrollAnimationDrawable(Context context, ParticleCollection.Listener listener) {
+        mContext = context;
+        mListener = listener;
+
         mSquarePaint = new Paint();
         mSquarePaint.setColor(Color.WHITE);
         mSquarePaint.setAntiAlias(true);
@@ -46,9 +75,35 @@ public class FaceEnrollAnimationDrawable extends Drawable {
         mCircleCutoutPaint.setAntiAlias(true);
     }
 
+    @Override
+    public void onEnrollmentHelp(int helpMsgId, CharSequence helpString) {
+        mParticleCollection.onEnrollmentHelp(helpMsgId, helpString);
+    }
+
+    @Override
+    public void onEnrollmentError(int errMsgId, CharSequence errString) {
+        mParticleCollection.onEnrollmentError(errMsgId, errString);
+    }
+
+    @Override
+    public void onEnrollmentProgressChange(int steps, int remaining) {
+        mParticleCollection.onEnrollmentProgressChange(steps, remaining);
+    }
+
     @Override
     protected void onBoundsChange(Rect bounds) {
         mBounds = bounds;
+        mParticleCollection =
+                new ParticleCollection(mContext, mAnimationListener, bounds, BORDER_BOUNDS);
+
+        if (mTimeAnimator == null) {
+            mTimeAnimator = new TimeAnimator();
+            mTimeAnimator.setTimeListener((animation, totalTimeMs, deltaTimeMs) -> {
+                mParticleCollection.update(totalTimeMs, deltaTimeMs);
+                FaceEnrollAnimationDrawable.this.invalidateSelf();
+            });
+            mTimeAnimator.start();
+        }
     }
 
     @Override
@@ -63,7 +118,10 @@ public class FaceEnrollAnimationDrawable extends Drawable {
 
         // Clear a circle in the middle for the camera preview
         canvas.drawCircle(mBounds.exactCenterX(), mBounds.exactCenterY(),
-                mBounds.height() / 2, mCircleCutoutPaint);
+                mBounds.height() / 2 - BORDER_BOUNDS, mCircleCutoutPaint);
+
+        // Draw the animation
+        mParticleCollection.draw(canvas);
 
         canvas.restore();
     }