From 0c7065912dc0b4fe8b9d6885b623f7fa6d4d8162 Mon Sep 17 00:00:00 2001
From: Curtis Belmonte <curtislb@google.com>
Date: Wed, 3 Mar 2021 10:51:49 -0800
Subject: [PATCH] Adjust UDFPS prompt for 3-button nav and landscape

Modifies the layout of BiometricPrompt for under-display fingerprint
sensors so that the fingerprint icon is aligned with the sensor when the
device is in the landscape orientation and/or using 3-button navigation.

Test: atest AuthBiometricViewTest
Test: Manually, using the biometric integration test app

Bug: 179044674
Change-Id: I4da075b4cbf8b7119c071361336ddebd0a505ce0
---
 .../res/layout/auth_biometric_contents.xml    |  18 +-
 packages/SystemUI/res/values/styles.xml       |   6 +
 .../biometrics/AuthBiometricUdfpsView.java    | 280 ++++++++++++++----
 .../biometrics/AuthBiometricView.java         |   1 +
 .../biometrics/AuthContainerView.java         |  32 ++
 .../biometrics/AuthPanelController.java       |  59 +++-
 .../biometrics/AuthBiometricViewTest.java     |  56 +++-
 7 files changed, 367 insertions(+), 85 deletions(-)

diff --git a/packages/SystemUI/res/layout/auth_biometric_contents.xml b/packages/SystemUI/res/layout/auth_biometric_contents.xml
index aed067c302536..eef37ab20c693 100644
--- a/packages/SystemUI/res/layout/auth_biometric_contents.xml
+++ b/packages/SystemUI/res/layout/auth_biometric_contents.xml
@@ -39,37 +39,34 @@
 
     <Space android:id="@+id/space_above_icon"
         android:layout_width="match_parent"
-        android:layout_height="48dp"
-        android:visibility="visible" />
+        android:layout_height="48dp" />
 
-    <!-- Use a frame layout since certain biometrics (such as UDFPS) require the icon to be centered
-         within a certain area on the display. This makes it easy to 1) guarantee max size, and
-         2) center the icon within the reserved area. -->
-    <FrameLayout android:id="@+id/biometric_icon_frame"
+    <FrameLayout
+        android:id="@+id/biometric_icon_frame"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_gravity="center_horizontal">
+
         <ImageView
             android:id="@+id/biometric_icon"
             android:layout_width="@dimen/biometric_dialog_biometric_icon_size"
             android:layout_height="@dimen/biometric_dialog_biometric_icon_size"
             android:layout_gravity="center"
             android:scaleType="fitXY" />
+
     </FrameLayout>
 
-    <!-- For sensors such as UDFPS, this view is used during custom measurement/layoutto add extra
+    <!-- For sensors such as UDFPS, this view is used during custom measurement/layout to add extra
          padding so that the biometric icon is always in the right physical position. -->
     <Space android:id="@+id/space_below_icon"
         android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:visibility="gone" />
+        android:layout_height="12dp" />
 
     <TextView
         android:id="@+id/indicator"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:paddingHorizontal="24dp"
-        android:paddingVertical="12dp"
         android:textSize="12sp"
         android:gravity="center_horizontal"
         android:accessibilityLiveRegion="polite"
@@ -84,6 +81,7 @@
         style="?android:attr/buttonBarStyle"
         android:orientation="horizontal"
         android:paddingTop="16dp">
+
         <Space android:id="@+id/leftSpacer"
             android:layout_width="8dp"
             android:layout_height="match_parent"
diff --git a/packages/SystemUI/res/values/styles.xml b/packages/SystemUI/res/values/styles.xml
index ec26b8d7a6a8e..3c48548cc0fe6 100644
--- a/packages/SystemUI/res/values/styles.xml
+++ b/packages/SystemUI/res/values/styles.xml
@@ -244,6 +244,8 @@
         <item name="android:paddingTop">12dp</item>
         <item name="android:paddingHorizontal">24dp</item>
         <item name="android:textSize">24sp</item>
+        <item name="android:singleLine">true</item>
+        <item name="android:ellipsize">marquee</item>
     </style>
 
     <style name="TextAppearance.AuthCredential.Subtitle">
@@ -251,6 +253,8 @@
         <item name="android:paddingTop">8dp</item>
         <item name="android:paddingHorizontal">24dp</item>
         <item name="android:textSize">16sp</item>
+        <item name="android:singleLine">true</item>
+        <item name="android:ellipsize">marquee</item>
     </style>
 
     <style name="TextAppearance.AuthCredential.Description">
@@ -258,6 +262,8 @@
         <item name="android:paddingTop">8dp</item>
         <item name="android:paddingHorizontal">24dp</item>
         <item name="android:textSize">14sp</item>
+        <item name="android:singleLine">true</item>
+        <item name="android:ellipsize">marquee</item>
     </style>
 
     <style name="TextAppearance.AuthCredential.Error">
diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/AuthBiometricUdfpsView.java b/packages/SystemUI/src/com/android/systemui/biometrics/AuthBiometricUdfpsView.java
index cc608ef87bc6b..007080bc8603f 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/AuthBiometricUdfpsView.java
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/AuthBiometricUdfpsView.java
@@ -16,17 +16,22 @@
 
 package com.android.systemui.biometrics;
 
+import android.annotation.IdRes;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.content.Context;
+import android.graphics.Insets;
 import android.graphics.Rect;
 import android.hardware.fingerprint.FingerprintSensorPropertiesInternal;
 import android.util.AttributeSet;
 import android.util.Log;
+import android.view.Surface;
 import android.view.View;
 import android.view.WindowInsets;
 import android.view.WindowManager;
+import android.widget.FrameLayout;
 
+import com.android.internal.annotations.VisibleForTesting;
 import com.android.systemui.R;
 
 /**
@@ -51,53 +56,38 @@ public class AuthBiometricUdfpsView extends AuthBiometricFingerprintView {
         mSensorProps = prop;
     }
 
-    /**
-     * For devices where the sensor is too high up, calculates the amount of padding necessary to
-     * move/center the biometric icon within the sensor's physical location.
-     */
-    static int calculateBottomSpacerHeight(int displayHeightPx, int navbarHeightPx,
-            int dialogBottomMarginPx, @NonNull View buttonBar, @NonNull View textIndicator,
-            @NonNull FingerprintSensorPropertiesInternal sensorProperties) {
-        final int sensorDistanceFromBottom = displayHeightPx - sensorProperties.sensorLocationY
-                - sensorProperties.sensorRadius;
-
-        final int spacerHeight = sensorDistanceFromBottom
-                - textIndicator.getMeasuredHeight()
-                - buttonBar.getMeasuredHeight()
-                - dialogBottomMarginPx
-                - navbarHeightPx;
-
-        Log.d(TAG, "Display height: " + displayHeightPx
-                + ", Distance from bottom: " + sensorDistanceFromBottom
-                + ", Bottom margin: " + dialogBottomMarginPx
-                + ", Navbar height: " + navbarHeightPx
-                + ", Spacer height: " + spacerHeight);
-
-        return spacerHeight;
+    @Override
+    @NonNull
+    AuthDialog.LayoutParams onMeasureInternal(int width, int height) {
+        final int displayRotation = getDisplay().getRotation();
+        switch (displayRotation) {
+            case Surface.ROTATION_0:
+                return onMeasureInternalPortrait(width, height);
+            case Surface.ROTATION_90:
+            case Surface.ROTATION_270:
+                return onMeasureInternalLandscape(width, height);
+            default:
+                Log.e(TAG, "Unsupported display rotation: " + displayRotation);
+                return super.onMeasureInternal(width, height);
+        }
     }
 
-    @Override
-    AuthDialog.LayoutParams onMeasureInternal(int width, int height) {
-        final View spaceBelowIcon = findViewById(R.id.space_below_icon);
-        spaceBelowIcon.setVisibility(View.VISIBLE);
-
+    @NonNull
+    private AuthDialog.LayoutParams onMeasureInternalPortrait(int width, int height) {
         // Get the height of the everything below the icon. Currently, that's the indicator and
-        // button bar
-        final View textIndicator = findViewById(R.id.indicator);
-        final View buttonBar = findViewById(R.id.button_bar);
+        // button bar.
+        final int textIndicatorHeight = getViewHeightPx(R.id.indicator);
+        final int buttonBarHeight = getViewHeightPx(R.id.button_bar);
 
         // Figure out where the bottom of the sensor anim should be.
         // Navbar + dialogMargin + buttonBar + textIndicator + spacerHeight = sensorDistFromBottom
-        final int dialogBottomMarginPx = getResources()
-                .getDimensionPixelSize(R.dimen.biometric_dialog_border_padding);
-        final WindowManager wm = getContext().getSystemService(WindowManager.class);
-        final Rect bounds = wm.getCurrentWindowMetrics().getBounds();
-        final int navbarHeight = wm.getCurrentWindowMetrics().getWindowInsets()
-                .getInsets(WindowInsets.Type.navigationBars()).toRect().height();
-        final int displayHeight = bounds.height();
-
-        final int spacerHeight = calculateBottomSpacerHeight(displayHeight, navbarHeight,
-                dialogBottomMarginPx, buttonBar, textIndicator, mSensorProps);
+        final int dialogMargin = getDialogMarginPx();
+        final WindowManager windowManager = getContext().getSystemService(WindowManager.class);
+        final int displayHeight = getWindowBounds(windowManager).height();
+        final Insets navbarInsets = getNavbarInsets(windowManager);
+        final int bottomSpacerHeight = calculateBottomSpacerHeightForPortrait(
+                mSensorProps, displayHeight, textIndicatorHeight, buttonBarHeight,
+                dialogMargin, navbarInsets.bottom);
 
         // Go through each of the children and do the custom measurement.
         int totalHeight = 0;
@@ -105,22 +95,25 @@ public class AuthBiometricUdfpsView extends AuthBiometricFingerprintView {
         final int sensorDiameter = mSensorProps.sensorRadius * 2;
         for (int i = 0; i < numChildren; i++) {
             final View child = getChildAt(i);
-
             if (child.getId() == R.id.biometric_icon_frame) {
-                // Create a frame that's exactly the size of the sensor circle
-                child.measure(
-                        MeasureSpec.makeMeasureSpec(sensorDiameter, MeasureSpec.EXACTLY),
-                        MeasureSpec.makeMeasureSpec(sensorDiameter, MeasureSpec.EXACTLY));
-            } else if (child.getId() == R.id.biometric_icon) {
-                // Icon should never be larger than the circle
-                child.measure(
+                final FrameLayout iconFrame = (FrameLayout) child;
+                final View icon = iconFrame.getChildAt(0);
+
+                // Ensure that the icon is never larger than the sensor.
+                icon.measure(
                         MeasureSpec.makeMeasureSpec(sensorDiameter, MeasureSpec.AT_MOST),
                         MeasureSpec.makeMeasureSpec(sensorDiameter, MeasureSpec.AT_MOST));
+
+                // Create a frame that's exactly the height of the sensor circle.
+                iconFrame.measure(
+                        MeasureSpec.makeMeasureSpec(
+                                child.getLayoutParams().width, MeasureSpec.EXACTLY),
+                        MeasureSpec.makeMeasureSpec(sensorDiameter, MeasureSpec.EXACTLY));
             } else if (child.getId() == R.id.space_above_icon) {
                 child.measure(
                         MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
-                        MeasureSpec.makeMeasureSpec(child.getLayoutParams().height,
-                                MeasureSpec.EXACTLY));
+                        MeasureSpec.makeMeasureSpec(
+                                child.getLayoutParams().height, MeasureSpec.EXACTLY));
             } else if (child.getId() == R.id.button_bar) {
                 child.measure(
                         MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
@@ -128,8 +121,9 @@ public class AuthBiometricUdfpsView extends AuthBiometricFingerprintView {
                                 MeasureSpec.EXACTLY));
             } else if (child.getId() == R.id.space_below_icon) {
                 // Set the spacer height so the fingerprint icon is on the physical sensor area
-                child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
-                        MeasureSpec.makeMeasureSpec(spacerHeight, MeasureSpec.EXACTLY));
+                child.measure(
+                        MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
+                        MeasureSpec.makeMeasureSpec(bottomSpacerHeight, MeasureSpec.EXACTLY));
             } else {
                 child.measure(
                         MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY),
@@ -143,4 +137,184 @@ public class AuthBiometricUdfpsView extends AuthBiometricFingerprintView {
 
         return new AuthDialog.LayoutParams(width, totalHeight);
     }
+
+    @NonNull
+    private AuthDialog.LayoutParams onMeasureInternalLandscape(int width, int height) {
+        // Find the spacer height needed to vertically align the icon with the sensor.
+        final int titleHeight = getViewHeightPx(R.id.title);
+        final int subtitleHeight = getViewHeightPx(R.id.subtitle);
+        final int descriptionHeight = getViewHeightPx(R.id.description);
+        final int topSpacerHeight = getViewHeightPx(R.id.space_above_icon);
+        final int textIndicatorHeight = getViewHeightPx(R.id.indicator);
+        final int buttonBarHeight = getViewHeightPx(R.id.button_bar);
+        final WindowManager windowManager = getContext().getSystemService(WindowManager.class);
+        final Insets navbarInsets = getNavbarInsets(windowManager);
+        final int bottomSpacerHeight = calculateBottomSpacerHeightForLandscape(titleHeight,
+                subtitleHeight, descriptionHeight, topSpacerHeight, textIndicatorHeight,
+                buttonBarHeight, navbarInsets.bottom);
+
+        // Find the spacer width needed to horizontally align the icon with the sensor.
+        final int displayWidth = getWindowBounds(windowManager).width();
+        final int dialogMargin = getDialogMarginPx();
+        final int horizontalInset = navbarInsets.left + navbarInsets.right;
+        final int horizontalSpacerWidth = calculateHorizontalSpacerWidthForLandscape(
+                mSensorProps, displayWidth, dialogMargin, horizontalInset);
+
+        final int sensorDiameter = mSensorProps.sensorRadius * 2;
+        final int remeasuredWidth = sensorDiameter + 2 * horizontalSpacerWidth;
+
+        int remeasuredHeight = 0;
+        final int numChildren = getChildCount();
+        for (int i = 0; i < numChildren; i++) {
+            final View child = getChildAt(i);
+            if (child.getId() == R.id.biometric_icon_frame) {
+                final FrameLayout iconFrame = (FrameLayout) child;
+                final View icon = iconFrame.getChildAt(0);
+
+                // Ensure that the icon is never larger than the sensor.
+                icon.measure(
+                        MeasureSpec.makeMeasureSpec(sensorDiameter, MeasureSpec.AT_MOST),
+                        MeasureSpec.makeMeasureSpec(sensorDiameter, MeasureSpec.AT_MOST));
+
+                // Create a frame that's exactly the height of the sensor circle.
+                iconFrame.measure(
+                        MeasureSpec.makeMeasureSpec(remeasuredWidth, MeasureSpec.EXACTLY),
+                        MeasureSpec.makeMeasureSpec(sensorDiameter, MeasureSpec.EXACTLY));
+            } else if (child.getId() == R.id.space_above_icon || child.getId() == R.id.button_bar) {
+                // Adjust the width of the top spacer and button bar while preserving their heights.
+                child.measure(
+                        MeasureSpec.makeMeasureSpec(remeasuredWidth, MeasureSpec.EXACTLY),
+                        MeasureSpec.makeMeasureSpec(
+                                child.getLayoutParams().height, MeasureSpec.EXACTLY));
+            } else if (child.getId() == R.id.space_below_icon) {
+                // Adjust the bottom spacer height to align the fingerprint icon with the sensor.
+                child.measure(
+                        MeasureSpec.makeMeasureSpec(remeasuredWidth, MeasureSpec.EXACTLY),
+                        MeasureSpec.makeMeasureSpec(bottomSpacerHeight, MeasureSpec.EXACTLY));
+            } else {
+                // Use the remeasured width for all other child views.
+                child.measure(
+                        MeasureSpec.makeMeasureSpec(remeasuredWidth, MeasureSpec.EXACTLY),
+                        MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST));
+            }
+
+            if (child.getVisibility() != View.GONE) {
+                remeasuredHeight += child.getMeasuredHeight();
+            }
+        }
+
+        return new AuthDialog.LayoutParams(remeasuredWidth, remeasuredHeight);
+    }
+
+    private int getViewHeightPx(@IdRes int viewId) {
+        final View view = findViewById(viewId);
+        return view != null ? view.getMeasuredHeight() : 0;
+    }
+
+    private int getDialogMarginPx() {
+        return getResources().getDimensionPixelSize(R.dimen.biometric_dialog_border_padding);
+    }
+
+    @NonNull
+    private static Insets getNavbarInsets(@Nullable WindowManager windowManager) {
+        return windowManager != null && windowManager.getCurrentWindowMetrics() != null
+                ? windowManager.getCurrentWindowMetrics().getWindowInsets()
+                        .getInsets(WindowInsets.Type.navigationBars())
+                : Insets.NONE;
+    }
+
+    @NonNull
+    private static Rect getWindowBounds(@Nullable WindowManager windowManager) {
+        return windowManager != null && windowManager.getCurrentWindowMetrics() != null
+                ? windowManager.getCurrentWindowMetrics().getBounds()
+                : new Rect();
+    }
+
+    /**
+     * For devices in portrait orientation where the sensor is too high up, calculates the amount of
+     * padding necessary to center the biometric icon within the sensor's physical location.
+     */
+    @VisibleForTesting
+    static int calculateBottomSpacerHeightForPortrait(
+            @NonNull FingerprintSensorPropertiesInternal sensorProperties, int displayHeightPx,
+            int textIndicatorHeightPx, int buttonBarHeightPx, int dialogMarginPx,
+            int navbarBottomInsetPx) {
+
+        final int sensorDistanceFromBottom = displayHeightPx
+                - sensorProperties.sensorLocationY
+                - sensorProperties.sensorRadius;
+
+        final int spacerHeight = sensorDistanceFromBottom
+                - textIndicatorHeightPx
+                - buttonBarHeightPx
+                - dialogMarginPx
+                - navbarBottomInsetPx;
+
+        Log.d(TAG, "Display height: " + displayHeightPx
+                + ", Distance from bottom: " + sensorDistanceFromBottom
+                + ", Bottom margin: " + dialogMarginPx
+                + ", Navbar bottom inset: " + navbarBottomInsetPx
+                + ", Bottom spacer height (portrait): " + spacerHeight);
+
+        return spacerHeight;
+    }
+
+    /**
+     * For devices in landscape orientation where the sensor is too high up, calculates the amount
+     * of padding necessary to center the biometric icon within the sensor's physical location.
+     */
+    @VisibleForTesting
+    static int calculateBottomSpacerHeightForLandscape(int titleHeightPx, int subtitleHeightPx,
+            int descriptionHeightPx, int topSpacerHeightPx, int textIndicatorHeightPx,
+            int buttonBarHeightPx, int navbarBottomInsetPx) {
+
+        final int dialogHeightAboveIcon = titleHeightPx
+                + subtitleHeightPx
+                + descriptionHeightPx
+                + topSpacerHeightPx;
+
+        final int dialogHeightBelowIcon = textIndicatorHeightPx + buttonBarHeightPx;
+
+        final int bottomSpacerHeight = dialogHeightAboveIcon
+                - dialogHeightBelowIcon
+                - navbarBottomInsetPx;
+
+        Log.d(TAG, "Title height: " + titleHeightPx
+                + ", Subtitle height: " + subtitleHeightPx
+                + ", Description height: " + descriptionHeightPx
+                + ", Top spacer height: " + topSpacerHeightPx
+                + ", Text indicator height: " + textIndicatorHeightPx
+                + ", Button bar height: " + buttonBarHeightPx
+                + ", Navbar bottom inset: " + navbarBottomInsetPx
+                + ", Bottom spacer height (landscape): " + bottomSpacerHeight);
+
+        return bottomSpacerHeight;
+    }
+
+    /**
+     * For devices in landscape orientation where the sensor is too left/right, calculates the
+     * amount of padding necessary to center the biometric icon within the sensor's physical
+     * location.
+     */
+    @VisibleForTesting
+    static int calculateHorizontalSpacerWidthForLandscape(
+            @NonNull FingerprintSensorPropertiesInternal sensorProperties, int displayWidthPx,
+            int dialogMarginPx, int navbarHorizontalInsetPx) {
+
+        final int sensorDistanceFromEdge = displayWidthPx
+                - sensorProperties.sensorLocationY
+                - sensorProperties.sensorRadius;
+
+        final int horizontalPadding = sensorDistanceFromEdge
+                - dialogMarginPx
+                - navbarHorizontalInsetPx;
+
+        Log.d(TAG, "Display width: " + displayWidthPx
+                + ", Distance from edge: " + sensorDistanceFromEdge
+                + ", Dialog margin: " + dialogMarginPx
+                + ", Navbar horizontal inset: " + navbarHorizontalInsetPx
+                + ", Horizontal spacer width (landscape): " + horizontalPadding);
+
+        return horizontalPadding;
+    }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/AuthBiometricView.java b/packages/SystemUI/src/com/android/systemui/biometrics/AuthBiometricView.java
index 18206efefe9a4..d59a865e2adda 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/AuthBiometricView.java
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/AuthBiometricView.java
@@ -742,6 +742,7 @@ public abstract class AuthBiometricView extends LinearLayout {
      * @param height Height to constrain the measurements to.
      * @return See {@link AuthDialog.LayoutParams}
      */
+    @NonNull
     AuthDialog.LayoutParams onMeasureInternal(int width, int height) {
         int totalHeight = 0;
         final int numChildren = getChildCount();
diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java b/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java
index 935f893437544..d05e9278762dd 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java
@@ -32,8 +32,10 @@ import android.os.IBinder;
 import android.os.Looper;
 import android.os.UserManager;
 import android.util.Log;
+import android.view.Gravity;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
+import android.view.Surface;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.WindowInsets;
@@ -433,6 +435,29 @@ public class AuthContainerView extends LinearLayout
                     + mConfig.mPromptInfo.getAuthenticators());
         }
 
+        if (mBiometricView instanceof AuthBiometricUdfpsView) {
+            final int displayRotation = getDisplay().getRotation();
+            switch (displayRotation) {
+                case Surface.ROTATION_0:
+                    mPanelController.setPosition(AuthPanelController.POSITION_BOTTOM);
+                    setScrollViewGravity(Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM);
+                    break;
+                case Surface.ROTATION_90:
+                    mPanelController.setPosition(AuthPanelController.POSITION_RIGHT);
+                    setScrollViewGravity(Gravity.CENTER_VERTICAL | Gravity.RIGHT);
+                    break;
+                case Surface.ROTATION_270:
+                    mPanelController.setPosition(AuthPanelController.POSITION_LEFT);
+                    setScrollViewGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
+                    break;
+                default:
+                    Log.e(TAG, "Unsupported display rotation: " + displayRotation);
+                    mPanelController.setPosition(AuthPanelController.POSITION_BOTTOM);
+                    setScrollViewGravity(Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM);
+                    break;
+            }
+        }
+
         if (mConfig.mSkipIntro) {
             mContainerState = STATE_SHOWING;
         } else {
@@ -476,6 +501,13 @@ public class AuthContainerView extends LinearLayout
         }
     }
 
+    private void setScrollViewGravity(int gravity) {
+        final FrameLayout.LayoutParams params =
+                (FrameLayout.LayoutParams) mBiometricScrollView.getLayoutParams();
+        params.gravity = gravity;
+        mBiometricScrollView.setLayoutParams(params);
+    }
+
     @Override
     public void onDetachedFromWindow() {
         super.onDetachedFromWindow();
diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/AuthPanelController.java b/packages/SystemUI/src/com/android/systemui/biometrics/AuthPanelController.java
index 11503fbd0b1d8..fa50f895f83ec 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/AuthPanelController.java
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/AuthPanelController.java
@@ -18,6 +18,7 @@ package com.android.systemui.biometrics;
 
 import android.animation.AnimatorSet;
 import android.animation.ValueAnimator;
+import android.annotation.IntDef;
 import android.content.Context;
 import android.graphics.Outline;
 import android.util.Log;
@@ -27,10 +28,20 @@ import android.view.animation.AccelerateDecelerateInterpolator;
 
 import com.android.systemui.R;
 
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
 /**
  * Controls the back panel and its animations for the BiometricPrompt UI.
  */
 public class AuthPanelController extends ViewOutlineProvider {
+    public static final int POSITION_BOTTOM = 1;
+    public static final int POSITION_LEFT = 2;
+    public static final int POSITION_RIGHT = 3;
+
+    @IntDef({POSITION_BOTTOM, POSITION_LEFT, POSITION_RIGHT})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface Position {}
 
     private static final String TAG = "BiometricPrompt/AuthPanelController";
     private static final boolean DEBUG = false;
@@ -38,6 +49,7 @@ public class AuthPanelController extends ViewOutlineProvider {
     private final Context mContext;
     private final View mPanelView;
 
+    @Position private int mPosition = POSITION_BOTTOM;
     private boolean mUseFullScreen;
 
     private int mContainerWidth;
@@ -51,21 +63,44 @@ public class AuthPanelController extends ViewOutlineProvider {
 
     @Override
     public void getOutline(View view, Outline outline) {
-        final int left = (mContainerWidth - mContentWidth) / 2;
-        final int right = mContainerWidth - left;
+        final int left = getLeftBound(mPosition);
+        final int right = left + mContentWidth;
 
-        // If the content fits within the container, shrink the height to wrap the content.
-        // Otherwise, set the outline to be the display size minus the margin - the content within
-        // is scrollable.
-        final int top = mContentHeight < mContainerHeight
-                ? mContainerHeight - mContentHeight - mMargin
-                : mMargin;
+        // If the content fits in the container, shrink the height to wrap it. Otherwise, expand to
+        // fill the display (minus the margin), since the content is scrollable.
+        final int top = getTopBound(mPosition);
+        final int bottom = Math.min(top + mContentHeight, mContainerHeight - mMargin);
 
-        // TODO(b/139954942) Likely don't need to "+1" after we resolve the navbar styling.
-        final int bottom = mContainerHeight - mMargin + 1;
         outline.setRoundRect(left, top, right, bottom, mCornerRadius);
     }
 
+    private int getLeftBound(@Position int position) {
+        switch (position) {
+            case POSITION_BOTTOM:
+                return (mContainerWidth - mContentWidth) / 2;
+            case POSITION_LEFT:
+                return mMargin;
+            case POSITION_RIGHT:
+                return mContainerWidth - mContentWidth - mMargin;
+            default:
+                Log.e(TAG, "Unrecognized position: " + position);
+                return getLeftBound(POSITION_BOTTOM);
+        }
+    }
+
+    private int getTopBound(@Position int position) {
+        switch (position) {
+            case POSITION_BOTTOM:
+                return Math.max(mContainerHeight - mContentHeight - mMargin, mMargin);
+            case POSITION_LEFT:
+            case POSITION_RIGHT:
+                return Math.max((mContainerHeight - mContentHeight) / 2, mMargin);
+            default:
+                Log.e(TAG, "Unrecognized position: " + position);
+                return getTopBound(POSITION_BOTTOM);
+        }
+    }
+
     public void setContainerDimensions(int containerWidth, int containerHeight) {
         if (DEBUG) {
             Log.v(TAG, "Container Width: " + containerWidth + " Height: " + containerHeight);
@@ -74,6 +109,10 @@ public class AuthPanelController extends ViewOutlineProvider {
         mContainerHeight = containerHeight;
     }
 
+    public void setPosition(@Position int position) {
+        mPosition = position;
+    }
+
     public void setUseFullScreen(boolean fullScreen) {
         mUseFullScreen = fullScreen;
     }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/biometrics/AuthBiometricViewTest.java b/packages/SystemUI/tests/src/com/android/systemui/biometrics/AuthBiometricViewTest.java
index 49282ee360e25..7f8be91253168 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/biometrics/AuthBiometricViewTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/biometrics/AuthBiometricViewTest.java
@@ -22,10 +22,8 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.eq;
-import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
 
 import android.content.Context;
 import android.hardware.biometrics.PromptInfo;
@@ -333,16 +331,12 @@ public class AuthBiometricViewTest extends SysuiTestCase {
     }
 
     @Test
-    public void testUdfpsBottomSpacerCalculation() {
+    public void testUdfpsBottomSpacerHeightForPortrait() {
         final int displayHeightPx = 3000;
         final int navbarHeightPx = 10;
         final int dialogBottomMarginPx = 20;
-
-        final View buttonBar = mock(View.class);
-        when(buttonBar.getMeasuredHeight()).thenReturn(100);
-
-        final View textIndicator = mock(View.class);
-        when(textIndicator.getMeasuredHeight()).thenReturn(200);
+        final int buttonBarHeightPx = 100;
+        final int textIndicatorHeightPx = 200;
 
         final int sensorLocationX = 540;
         final int sensorLocationY = 1600;
@@ -353,9 +347,47 @@ public class AuthBiometricViewTest extends SysuiTestCase {
                 true /* resetLockoutRequiresHardwareAuthToken */, sensorLocationX, sensorLocationY,
                 sensorRadius);
 
-        assertEquals(970, AuthBiometricUdfpsView.calculateBottomSpacerHeight(
-                displayHeightPx, navbarHeightPx, dialogBottomMarginPx, buttonBar, textIndicator,
-                props));
+        assertEquals(970,
+                AuthBiometricUdfpsView.calculateBottomSpacerHeightForPortrait(
+                        props, displayHeightPx, textIndicatorHeightPx, buttonBarHeightPx,
+                        dialogBottomMarginPx, navbarHeightPx
+                ));
+    }
+
+    @Test
+    public void testUdfpsBottomSpacerHeightForLandscape() {
+        final int titleHeightPx = 320;
+        final int subtitleHeightPx = 240;
+        final int descriptionHeightPx = 200;
+        final int topSpacerHeightPx = 550;
+        final int textIndicatorHeightPx = 190;
+        final int buttonBarHeightPx = 160;
+        final int navbarBottomInsetPx = 75;
+
+        assertEquals(885,
+                AuthBiometricUdfpsView.calculateBottomSpacerHeightForLandscape(
+                        titleHeightPx, subtitleHeightPx, descriptionHeightPx, topSpacerHeightPx,
+                        textIndicatorHeightPx, buttonBarHeightPx, navbarBottomInsetPx));
+    }
+
+    @Test
+    public void testUdfpsHorizontalSpacerWidthForLandscape() {
+        final int displayWidthPx = 3000;
+        final int dialogMarginPx = 20;
+        final int navbarHorizontalInsetPx = 75;
+
+        final int sensorLocationX = 540;
+        final int sensorLocationY = 1600;
+        final int sensorRadius = 100;
+        final FingerprintSensorPropertiesInternal props = new FingerprintSensorPropertiesInternal(
+                0 /* sensorId */, SensorProperties.STRENGTH_STRONG, 5 /* maxEnrollmentsPerUser */,
+                FingerprintSensorProperties.TYPE_UDFPS_OPTICAL,
+                true /* resetLockoutRequiresHardwareAuthToken */, sensorLocationX, sensorLocationY,
+                sensorRadius);
+
+        assertEquals(1205,
+                AuthBiometricUdfpsView.calculateHorizontalSpacerWidthForLandscape(
+                        props, displayWidthPx, dialogMarginPx, navbarHorizontalInsetPx));
     }
 
     private PromptInfo buildPromptInfo(boolean allowDeviceCredential) {