KeygaurdBottomArea additional API cleanup

* Moves alpha setting of the ambient indication area into KBAV, as it
  already manages alpha for other child views
* Removes the need to get the ambient indication area from
  CentralSurfaces
* Cleans up overly poweful getter that gets the indication area from
  KBAV to only return a weaker object: an animator, one per each
  of the two indication areas

Bug: 235403546
Test: manually verified that the bottom buttons and "which song is
playing?" area show, hide, and animate appropriately.

Change-Id: I47760e3d400e01bfb6b1fa1cdaa6ae6dcd5ea521

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

@@ -265,9 +265,6 @@ public interface CentralSurfaces extends Dumpable, ActivityStarter, LifecycleOwn
 
     boolean isPulsing();
 
-    @Nullable
-    View getAmbientIndicationContainer();
-
     boolean isOccluded();
 
     //TODO: These can / should probably be moved to NotificationPresenter or ShadeController

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

@@ -1888,12 +1888,6 @@ public class CentralSurfacesImpl extends CoreStartable implements
         return mDozeServiceHost.isPulsing();
     }
 
-    @androidx.annotation.Nullable
-    @Override
-    public View getAmbientIndicationContainer() {
-        return mAmbientIndicationContainer;
-    }
-
     /**
      * When the keyguard is showing and covered by a "showWhenLocked" activity it
      * is occluded. This is controlled by {@link com.android.server.policy.PhoneWindowManager}

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

@@ -39,6 +39,7 @@ import android.util.Log;
 import android.util.TypedValue;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.ViewPropertyAnimator;
 import android.view.WindowInsets;
 import android.widget.FrameLayout;
 import android.widget.ImageView;
@@ -62,6 +63,9 @@ import com.android.systemui.qrcodescanner.controller.QRCodeScannerController;
 import com.android.systemui.statusbar.policy.KeyguardStateController;
 import com.android.systemui.wallet.controller.QuickAccessWalletController;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Implementation for the bottom area of the Keyguard, including camera/phone affordance and status
  * text.
@@ -347,8 +351,17 @@ public class KeyguardBottomAreaView extends FrameLayout {
         dozeTimeTick();
     }
 
-    public View getIndicationArea() {
-        return mIndicationArea;
+    /**
+     * Returns a list of animators to use to animate the indication areas.
+     */
+    public List<ViewPropertyAnimator> getIndicationAreaAnimators() {
+        List<ViewPropertyAnimator> animators =
+                new ArrayList<>(mAmbientIndicationArea != null ? 2 : 1);
+        animators.add(mIndicationArea.animate());
+        if (mAmbientIndicationArea != null) {
+            animators.add(mAmbientIndicationArea.animate());
+        }
+        return animators;
     }
 
     @Override
@@ -418,9 +431,17 @@ public class KeyguardBottomAreaView extends FrameLayout {
     }
 
     /**
-     * Sets the alpha of the indication areas and affordances, excluding the lock icon.
+     * Sets the alpha of various sub-components, for example the indication areas and bottom quick
+     * action buttons. Does not set the alpha of the lock icon.
      */
-    public void setAffordanceAlpha(float alpha) {
+    public void setComponentAlphas(float alpha) {
+        setImportantForAccessibility(
+                alpha == 0f
+                        ? View.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
+                        : View.IMPORTANT_FOR_ACCESSIBILITY_AUTO);
+        if (mAmbientIndicationArea != null) {
+            mAmbientIndicationArea.setAlpha(alpha);
+        }
         mIndicationArea.setAlpha(alpha);
         mWalletButton.setAlpha(alpha);
         mQRCodeScannerButton.setAlpha(alpha);

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

@@ -3194,14 +3194,7 @@ public final class NotificationPanelViewController extends PanelViewController {
                 getExpandedFraction());
         float alpha = Math.min(expansionAlpha, 1 - computeQsExpansionFraction());
         alpha *= mBottomAreaShadeAlpha;
-        mKeyguardBottomArea.setAffordanceAlpha(alpha);
-        mKeyguardBottomArea.setImportantForAccessibility(
-                alpha == 0f ? View.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
-                        : View.IMPORTANT_FOR_ACCESSIBILITY_AUTO);
-        View ambientIndicationContainer = mCentralSurfaces.getAmbientIndicationContainer();
-        if (ambientIndicationContainer != null) {
-            ambientIndicationContainer.setAlpha(alpha);
-        }
+        mKeyguardBottomArea.setComponentAlphas(alpha);
         mLockIconViewController.setAlpha(alpha);
     }
 

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

@@ -41,6 +41,7 @@ import android.view.VelocityTracker;
 import android.view.View;
 import android.view.ViewConfiguration;
 import android.view.ViewGroup;
+import android.view.ViewPropertyAnimator;
 import android.view.ViewTreeObserver;
 import android.view.animation.Interpolator;
 
@@ -66,6 +67,7 @@ import com.android.systemui.util.time.SystemClock;
 import com.android.wm.shell.animation.FlingAnimationUtils;
 
 import java.io.PrintWriter;
+import java.util.List;
 
 public abstract class PanelViewController {
     public static final boolean DEBUG = PanelView.DEBUG;
@@ -1034,16 +1036,19 @@ public abstract class PanelViewController {
         animator.start();
         setAnimator(animator);
 
-        View[] viewsToAnimate = {
-                mKeyguardBottomArea.getIndicationArea(),
-                mCentralSurfaces.getAmbientIndicationContainer()};
-        for (View v : viewsToAnimate) {
-            if (v == null) {
-                continue;
-            }
-            v.animate().translationY(-mHintDistance).setDuration(250).setInterpolator(
-                    Interpolators.FAST_OUT_SLOW_IN).withEndAction(() -> v.animate().translationY(
-                    0).setDuration(450).setInterpolator(mBounceInterpolator).start()).start();
+        final List<ViewPropertyAnimator> indicationAnimators =
+                mKeyguardBottomArea.getIndicationAreaAnimators();
+        for (final ViewPropertyAnimator indicationAreaAnimator : indicationAnimators) {
+            indicationAreaAnimator
+                    .translationY(-mHintDistance)
+                    .setDuration(250)
+                    .setInterpolator(Interpolators.FAST_OUT_SLOW_IN)
+                    .withEndAction(() -> indicationAreaAnimator
+                            .translationY(0)
+                            .setDuration(450)
+                            .setInterpolator(mBounceInterpolator)
+                            .start())
+                    .start();
         }
     }