Sensitive Notification Reveal Animation Preparations

This CL includes some setup for the Sensitive Notification Reveal Animation.

Test: Manual, i.e. checking sensitive reveal animation when face unlocking. With this change, the animation has still issues related to the notification size change when revealing the private content. Therefore the Flag is deactivated by default.
Bug: 243634602
Change-Id: Iddcc9b0555bfe77266847d687604c2611db099a6
diff --git a/packages/SystemUI/src/com/android/systemui/flags/Flags.kt b/packages/SystemUI/src/com/android/systemui/flags/Flags.kt
index 6d0d893..0afdf66 100644
--- a/packages/SystemUI/src/com/android/systemui/flags/Flags.kt
+++ b/packages/SystemUI/src/com/android/systemui/flags/Flags.kt
@@ -117,6 +117,9 @@
     val ANIMATED_NOTIFICATION_SHADE_INSETS =
         unreleasedFlag(270682168, "animated_notification_shade_insets", teamfood = true)
 
+    // TODO(b/268005230): Tracking Bug
+    @JvmField val SENSITIVE_REVEAL_ANIM = unreleasedFlag(268005230, "sensitive_reveal_anim")
+
     // 200 - keyguard/lockscreen
     // ** Flag retired **
     // public static final BooleanFlag KEYGUARD_LAYOUT =
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRow.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRow.java
index bbabde3..55cb5d3 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRow.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRow.java
@@ -2805,9 +2805,10 @@
         int intrinsicBefore = getIntrinsicHeight();
         mSensitive = sensitive;
         mSensitiveHiddenInGeneral = hideSensitive;
-        if (intrinsicBefore != getIntrinsicHeight()) {
-            // The animation has a few flaws and is highly visible, so jump cut instead.
-            notifyHeightChanged(false /* needsAnimation */);
+        int intrinsicAfter = getIntrinsicHeight();
+        if (intrinsicBefore != intrinsicAfter) {
+            boolean needsAnimation = mFeatureFlags.isEnabled(Flags.SENSITIVE_REVEAL_ANIM);
+            notifyHeightChanged(needsAnimation);
         }
     }
 
@@ -2864,13 +2865,19 @@
         View[] publicViews = new View[]{mPublicLayout};
         View[] hiddenChildren = showingPublic ? privateViews : publicViews;
         View[] shownChildren = showingPublic ? publicViews : privateViews;
+        // disappear/appear overlap: 10 percent of duration
+        long overlap = duration / 10;
+        // disappear duration: 1/3 of duration + half of overlap
+        long disappearDuration = duration / 3 + overlap / 2;
+        // appear duration: 2/3 of duration + half of overlap
+        long appearDuration = (duration - disappearDuration) + overlap / 2;
         for (final View hiddenView : hiddenChildren) {
             hiddenView.setVisibility(View.VISIBLE);
             hiddenView.animate().cancel();
             hiddenView.animate()
                     .alpha(0f)
                     .setStartDelay(delay)
-                    .setDuration(duration)
+                    .setDuration(disappearDuration)
                     .withEndAction(() -> {
                         hiddenView.setVisibility(View.INVISIBLE);
                         resetAllContentAlphas();
@@ -2882,8 +2889,8 @@
             showView.animate().cancel();
             showView.animate()
                     .alpha(1f)
-                    .setStartDelay(delay)
-                    .setDuration(duration);
+                    .setStartDelay(delay + duration - appearDuration)
+                    .setDuration(appearDuration);
         }
     }
 
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRowTest.java b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRowTest.java
index 9e23d54..2a005f2 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRowTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/notification/row/ExpandableNotificationRowTest.java
@@ -103,6 +103,7 @@
 
         FakeFeatureFlags fakeFeatureFlags = new FakeFeatureFlags();
         fakeFeatureFlags.set(Flags.NOTIFICATION_ANIMATE_BIG_PICTURE, true);
+        fakeFeatureFlags.set(Flags.SENSITIVE_REVEAL_ANIM, false);
         mNotificationTestHelper.setFeatureFlags(fakeFeatureFlags);
     }