Do not darken scrims when unlocking with fp

Scrims would darken because notification panel would collapse.
Introduced a method to ignore the panel expansion.

Test: atest packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/ScrimControllerTest.java
Test: unlock with fp from bouncer and AOD
Test: pull down QS after unlocking, look at scrims
Fixes: 74426737
Change-Id: I94f4a3f3b5ea1eed709c853d945e646cd3f41f78

packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java

@@ -126,6 +126,7 @@ public class ScrimController implements ViewTreeObserver.OnPreDrawListener,
     private float mExpansionFraction = 1f;
 
     private boolean mDarkenWhileDragging;
+    private boolean mExpansionAffectsAlpha = true;
     protected boolean mAnimateChange;
     private boolean mUpdatePending;
     private boolean mTracking;
@@ -381,6 +382,10 @@ public class ScrimController implements ViewTreeObserver.OnPreDrawListener,
     }
 
     private void applyExpansionToAlpha() {
+        if (!mExpansionAffectsAlpha) {
+            return;
+        }
+
         if (mState == ScrimState.UNLOCKED) {
             // Darken scrim as you pull down the shade when unlocked
             float behindFraction = getInterpolatedFraction();
@@ -912,6 +917,10 @@ public class ScrimController implements ViewTreeObserver.OnPreDrawListener,
         mScreenOn = false;
     }
 
+    public void setExpansionAffectsAlpha(boolean expansionAffectsAlpha) {
+        mExpansionAffectsAlpha = expansionAffectsAlpha;
+    }
+
     public interface Callback {
         default void onStart() {
         }

packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java

@@ -3688,6 +3688,7 @@ public class StatusBar extends SystemUI implements DemoMode,
     public void finishKeyguardFadingAway() {
         mKeyguardFadingAway = false;
         mKeyguardMonitor.notifyKeyguardDoneFading();
+        mScrimController.setExpansionAffectsAlpha(true);
     }
 
     // TODO: Move this to NotificationLockscreenUserManager.
@@ -4618,6 +4619,10 @@ public class StatusBar extends SystemUI implements DemoMode,
         final boolean wakeAndUnlocking = mFingerprintUnlockController.getMode()
                 == FingerprintUnlockController.MODE_WAKE_AND_UNLOCK;
 
+        // Do not animate the scrim expansion when it's triggered by the fingerprint sensor.
+        mScrimController.setExpansionAffectsAlpha(mFingerprintUnlockController.getMode()
+                != FingerprintUnlockController.MODE_UNLOCK);
+
         if (mBouncerShowing) {
             mScrimController.transitionTo(
                     mIsOccluded ? ScrimState.BOUNCER_OCCLUDED : ScrimState.BOUNCER);

packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/ScrimControllerTest.java

@@ -205,6 +205,25 @@ public class ScrimControllerTest extends SysuiTestCase {
         assertScrimVisibility(VISIBILITY_FULLY_TRANSPARENT, VISIBILITY_SEMI_TRANSPARENT);
     }
 
+    @Test
+    public void panelExpansionAffectsAlpha() {
+        mScrimController.setPanelExpansion(0f);
+        mScrimController.setPanelExpansion(0.5f);
+        mScrimController.transitionTo(ScrimState.UNLOCKED);
+        mScrimController.finishAnimationsImmediately();
+
+        final float scrimAlpha = mScrimBehind.getViewAlpha();
+        mScrimController.setExpansionAffectsAlpha(false);
+        mScrimController.setPanelExpansion(0.8f);
+        Assert.assertEquals("Scrim opacity shouldn't change when setExpansionAffectsAlpha "
+                + "is false", scrimAlpha, mScrimBehind.getViewAlpha(), 0.01f);
+
+        mScrimController.setExpansionAffectsAlpha(true);
+        mScrimController.setPanelExpansion(0.1f);
+        Assert.assertNotEquals("Scrim opacity should change when setExpansionAffectsAlpha "
+                + "is true", scrimAlpha, mScrimBehind.getViewAlpha(), 0.01f);
+    }
+
     @Test
     public void transitionToUnlockedFromAod() {
         // Simulate unlock with fingerprint