Don't let UdfpsView intercept touches when pauseAuth=true

The UdfpsView was still showing (with alpha 0) when
shouldPauseAuth=true, so touches weren't being sent to the window under
it. To avoid this, set the UdfpsView to invisible when
pauseAuth=true.

This CL also fixes a bug where it was possible to slide to
authenticate when auth was paused. The isWithinSensorArea method in
UdfpsController needs to have an extra check for whether auth is paused.

Test: manual, atest SystemUITests
Fixes: 187016303
Change-Id: Idcfe95e68cb5ee8e8472f1ecde2bd1fb74f9a151

packages/SystemUI/src/com/android/systemui/biometrics/UdfpsAnimationView.java

@@ -20,6 +20,8 @@ import android.annotation.Nullable;
 import android.content.Context;
 import android.graphics.RectF;
 import android.util.AttributeSet;
+import android.view.View;
+import android.view.ViewGroup;
 import android.widget.FrameLayout;
 
 /**
@@ -73,7 +75,15 @@ abstract class UdfpsAnimationView extends FrameLayout {
     }
 
     protected void updateAlpha() {
-        getDrawable().setAlpha(calculateAlpha());
+        int alpha = calculateAlpha();
+        getDrawable().setAlpha(alpha);
+
+        // this is necessary so that touches won't be intercepted if udfps is paused:
+        if (mPauseAuth && alpha == 0 && getParent() != null) {
+            ((ViewGroup) getParent()).setVisibility(View.INVISIBLE);
+        } else {
+            ((ViewGroup) getParent()).setVisibility(View.VISIBLE);
+        }
     }
 
     int calculateAlpha() {

packages/SystemUI/src/com/android/systemui/biometrics/UdfpsController.java

@@ -296,7 +296,13 @@ public class UdfpsController implements DozeReceiver, HbmCallback {
             // TODO: move isWithinSensorArea to UdfpsController.
             return udfpsView.isWithinSensorArea(x, y);
         }
-        return getSensorLocation().contains(x, y);
+
+        if (mView == null || mView.getAnimationViewController() == null) {
+            return false;
+        }
+
+        return !mView.getAnimationViewController().shouldPauseAuth()
+                && getSensorLocation().contains(x, y);
     }
 
     private boolean onTouch(View view, MotionEvent event, boolean fromUdfpsView) {
@@ -529,7 +535,7 @@ public class UdfpsController implements DozeReceiver, HbmCallback {
         final int paddingY = animation != null ? animation.getPaddingY() : 0;
 
         mCoreLayoutParams.flags = getCoreLayoutParamFlags();
-        if (animation.listenForTouchesOutsideView()) {
+        if (animation != null && animation.listenForTouchesOutsideView()) {
             mCoreLayoutParams.flags |= WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;
         }
 

packages/SystemUI/src/com/android/systemui/biometrics/UdfpsView.java

@@ -87,7 +87,8 @@ public class UdfpsView extends FrameLayout implements DozeReceiver, UdfpsIllumin
     // Don't propagate any touch events to the child views.
     @Override
     public boolean onInterceptTouchEvent(MotionEvent ev) {
-        return true;
+        return mAnimationViewController == null
+                || !mAnimationViewController.shouldPauseAuth();
     }
 
     @Override
@@ -131,13 +132,20 @@ public class UdfpsView extends FrameLayout implements DozeReceiver, UdfpsIllumin
     }
 
     void onTouchOutsideView() {
-        mAnimationViewController.onTouchOutsideView();
+        if (mAnimationViewController != null) {
+            mAnimationViewController.onTouchOutsideView();
+        }
     }
 
-    void setAnimationViewController(UdfpsAnimationViewController animationViewController) {
+    void setAnimationViewController(
+            @Nullable UdfpsAnimationViewController animationViewController) {
         mAnimationViewController = animationViewController;
     }
 
+    @Nullable UdfpsAnimationViewController getAnimationViewController() {
+        return mAnimationViewController;
+    }
+
     @Override
     protected void onAttachedToWindow() {
         super.onAttachedToWindow();