Merge "Re-enable home screen rotation" into ub-launcher3-rvc-dev
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsViewStateController.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
index 3d6e519..2b13a1e 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
@@ -26,6 +26,7 @@
 import android.annotation.TargetApi;
 import android.os.Build;
 import android.util.FloatProperty;
+import android.view.Surface;
 import android.view.View;
 import android.view.animation.Interpolator;
 
@@ -91,8 +92,9 @@
                 buttonAlpha, LINEAR);
 
         View actionsView = mLauncher.getActionsView();
-        if (actionsView != null) {
-            propertySetter.setFloat(actionsView, VIEW_ALPHA, buttonAlpha, actionInterpolator);
+        int launcherRotation = mRecentsView.getPagedViewOrientedState().getLauncherRotation();
+        if (actionsView != null && launcherRotation == Surface.ROTATION_0) {
+            propertySetter.setViewAlpha(actionsView, buttonAlpha, actionInterpolator);
         }
     }
 
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/states/OverviewState.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/states/OverviewState.java
index bcfb11c..fc28da3 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/states/OverviewState.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/states/OverviewState.java
@@ -144,7 +144,6 @@
 
     @Override
     public void onStateTransitionEnd(Launcher launcher) {
-        launcher.getRotationHelper().setCurrentStateRequest(REQUEST_ROTATE);
         DiscoveryBounce.showForOverviewIfNeeded(launcher);
         RecentsView recentsView = launcher.getOverviewPanel();
         AccessibilityManagerCompat.sendCustomAccessibilityEvent(
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/BaseSwipeUpHandler.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/BaseSwipeUpHandler.java
index dc27056..3513ad5 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/BaseSwipeUpHandler.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/BaseSwipeUpHandler.java
@@ -322,13 +322,14 @@
             mAppWindowAnimationHelper.updateHomeBounds(getStackBounds(dp));
         }
         int displayRotation = 0;
-        if (mOrientedState != null) {
+        if (mOrientedState != null && !mOrientedState.areMultipleLayoutOrientationsDisabled()) {
             // TODO(b/150300347): The first recents animation after launcher is started with the
             //  foreground app not in landscape will look funky until that bug is fixed
             displayRotation = mOrientedState.getDisplayRotation();
 
             RectF tempRectF = new RectF(TEMP_RECT);
-            mOrientedState.mapRectFromNormalOrientation(tempRectF, dp.widthPx, dp.heightPx);
+            mOrientedState.mapRectFromRotation(displayRotation,
+                    tempRectF, dp.widthPx, dp.heightPx);
             tempRectF.roundOut(TEMP_RECT);
         }
         mAppWindowAnimationHelper.updateTargetRect(TEMP_RECT);
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/util/AppWindowAnimationHelper.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/util/AppWindowAnimationHelper.java
index 75a5976..b739838 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/util/AppWindowAnimationHelper.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/util/AppWindowAnimationHelper.java
@@ -160,9 +160,9 @@
     }
 
     private float getSrcToTargetScale() {
-        if (mOrientedState == null ||
-            (mOrientedState.getDisplayRotation() == Surface.ROTATION_0
-                || mOrientedState.getDisplayRotation() == Surface.ROTATION_180)) {
+        if (mOrientedState == null
+                || mOrientedState.isHomeRotationAllowed()
+                || mOrientedState.isDisplayPhoneNatural()) {
             return mSourceRect.width() / mTargetRect.width();
         } else {
             return mSourceRect.height() / mTargetRect.height();
@@ -277,8 +277,9 @@
                 mCurrentRect.offset(params.mOffset, 0);
             } else {
                 int displayRotation = mOrientedState.getDisplayRotation();
+                int launcherRotation = mOrientedState.getLauncherRotation();
                 mOrientedState.getOrientationHandler().offsetTaskRect(mCurrentRect,
-                    params.mOffset, displayRotation);
+                    params.mOffset, displayRotation, launcherRotation);
             }
         }
 
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/LauncherRecentsView.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/LauncherRecentsView.java
index 98eb29a..87b0ad2 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/LauncherRecentsView.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/LauncherRecentsView.java
@@ -88,10 +88,6 @@
         }
     };
 
-    private RotationHelper.ForcedRotationChangedListener mForcedRotationChangedListener =
-            isForcedRotation -> LauncherRecentsView.this
-                    .disableMultipleLayoutRotations(!isForcedRotation);
-
     public LauncherRecentsView(Context context) {
         this(context, null);
     }
@@ -344,7 +340,6 @@
         super.onAttachedToWindow();
         PluginManagerWrapper.INSTANCE.get(getContext()).addPluginListener(
                 mRecentsExtraCardPluginListener, RecentsExtraCard.class);
-        mActivity.getRotationHelper().addForcedRotationCallback(mForcedRotationChangedListener);
     }
 
     @Override
@@ -352,7 +347,6 @@
         super.onDetachedFromWindow();
         PluginManagerWrapper.INSTANCE.get(getContext()).removePluginListener(
                 mRecentsExtraCardPluginListener);
-        mActivity.getRotationHelper().removeForcedRotationCallback(mForcedRotationChangedListener);
     }
 
     @Override
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java
index a18f7ba..e8d314d 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/views/RecentsView.java
@@ -50,6 +50,7 @@
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
+import android.content.res.Configuration;
 import android.graphics.Canvas;
 import android.graphics.Point;
 import android.graphics.Rect;
@@ -72,6 +73,7 @@
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.OrientationEventListener;
+import android.view.Surface;
 import android.view.View;
 import android.view.ViewDebug;
 import android.view.ViewGroup;
@@ -128,6 +130,7 @@
 import com.android.systemui.shared.recents.model.Task;
 import com.android.systemui.shared.recents.model.ThumbnailData;
 import com.android.systemui.shared.system.ActivityManagerWrapper;
+import com.android.systemui.shared.system.ConfigurationCompat;
 import com.android.systemui.shared.system.LauncherEventUtil;
 import com.android.systemui.shared.system.PackageManagerWrapper;
 import com.android.systemui.shared.system.SyncRtSurfaceTransactionApplierCompat;
@@ -172,7 +175,7 @@
                 }
             };
 
-    protected final RecentsOrientedState mOrientationState = new RecentsOrientedState();
+    protected RecentsOrientedState mOrientationState;
 
     private OrientationEventListener mOrientationListener;
     private int mPreviousRotation;
@@ -343,6 +346,7 @@
         super(context, attrs, defStyleAttr);
         setPageSpacing(getResources().getDimensionPixelSize(R.dimen.recents_page_spacing));
         setEnableFreeScroll(true);
+        mOrientationState = new RecentsOrientedState(context);
 
         mFastFlingVelocity = getResources()
                 .getDimensionPixelSize(R.dimen.recents_fast_fling_velocity);
@@ -482,6 +486,7 @@
         SystemUiProxy.INSTANCE.get(getContext()).setPinnedStackAnimationListener(
                 mIPinnedStackAnimationListener);
         setActionsView();
+        mOrientationState.init();
     }
 
     @Override
@@ -496,6 +501,7 @@
         mIdp.removeOnChangeListener(this);
         SystemUiProxy.INSTANCE.get(getContext()).setPinnedStackAnimationListener(null);
         mIPinnedStackAnimationListener.setActivity(null);
+        mOrientationState.destroy();
     }
 
     @Override
@@ -549,9 +555,7 @@
     }
 
     public void setOverviewStateEnabled(boolean enabled) {
-        if (supportsVerticalLandscape()
-                && !TestProtocol.sDisableSensorRotation // Ignore hardware dependency for tests
-                && mOrientationListener.canDetectOrientation()) {
+        if (canEnableOverviewRotationAnimation()) {
             if (enabled) {
                 mOrientationListener.enable();
             } else {
@@ -567,6 +571,13 @@
         }
     }
 
+    private boolean canEnableOverviewRotationAnimation() {
+        return supportsVerticalLandscape() // not 3P launcher
+                && !TestProtocol.sDisableSensorRotation // Ignore hardware dependency for tests..
+                && mOrientationListener.canDetectOrientation() // ..but does the hardware even work?
+                && !mOrientationState.canLauncherAutoRotate(); // launcher is going to rotate itself
+    }
+
     public void onDigitalWellbeingToastShown() {
         if (!mDwbToastShown) {
             mDwbToastShown = true;
@@ -585,6 +596,15 @@
     }
 
     @Override
+    protected void onConfigurationChanged(Configuration newConfig) {
+        super.onConfigurationChanged(newConfig);
+        int windowConfigurationRotation = ConfigurationCompat
+                .getWindowConfigurationRotation(getResources().getConfiguration());
+        setLayoutInternal(mOrientationState.getTouchRotation(),
+                mOrientationState.getDisplayRotation(), windowConfigurationRotation);
+    }
+
+    @Override
     public boolean onTouchEvent(MotionEvent ev) {
         super.onTouchEvent(ev);
         final int x = (int) ev.getX();
@@ -778,7 +798,7 @@
         for (int i = 0; i < taskCount; i++) {
             getTaskViewAt(i).setFullscreenProgress(mFullscreenProgress);
         }
-        if (mActionsView != null) {
+        if (mActionsView != null && mOrientationState.getLauncherRotation() == Surface.ROTATION_0) {
             mActionsView.setVisibility(fullscreenProgress == 0 ? VISIBLE : INVISIBLE);
         }
     }
@@ -1561,11 +1581,17 @@
     }
 
     public void setLayoutRotation(int touchRotation, int displayRotation) {
-        if (mOrientationState.update(touchRotation, displayRotation)) {
+        int launcherRotation = mOrientationState.getLauncherRotation();
+        setLayoutInternal(touchRotation, displayRotation, launcherRotation);
+    }
+
+    private void setLayoutInternal(int touchRotation, int displayRotation, int launcherRotation) {
+        if (mOrientationState.update(touchRotation, displayRotation, launcherRotation)) {
             mOrientationHandler = mOrientationState.getOrientationHandler();
             mIsRtl = mOrientationHandler.getRecentsRtlSetting(getResources());
             setLayoutDirection(mIsRtl ? View.LAYOUT_DIRECTION_RTL : View.LAYOUT_DIRECTION_LTR);
             mClearAllButton.setRotation(mOrientationHandler.getDegreesRotated());
+            mActivity.getDragLayer().recreateControllers();
             requestLayout();
         }
     }
@@ -2022,7 +2048,8 @@
     public Consumer<MotionEvent> getEventDispatcher(float navbarRotation) {
         float degreesRotated;
         if (navbarRotation == 0) {
-            degreesRotated = mOrientationState.getTouchRotationDegrees();
+            degreesRotated = mOrientationState.areMultipleLayoutOrientationsDisabled() ? 0 :
+                    mOrientationHandler.getDegreesRotated();
         } else {
             degreesRotated = -navbarRotation;
         }
@@ -2035,7 +2062,8 @@
         // PagedOrientationHandler
         return e -> {
             if (navbarRotation != 0
-                    && !mOrientationState.areMultipleLayoutOrientationsDisabled()) {
+                    && !mOrientationState.areMultipleLayoutOrientationsDisabled()
+                    && !mOrientationState.getOrientationHandler().isLayoutNaturalToLauncher()) {
                 mOrientationState.flipVertical(e);
                 super.onTouchEvent(e);
                 mOrientationState.flipVertical(e);
diff --git a/quickstep/src/com/android/quickstep/OrientationTouchTransformer.java b/quickstep/src/com/android/quickstep/OrientationTouchTransformer.java
index 495c092..2e99500 100644
--- a/quickstep/src/com/android/quickstep/OrientationTouchTransformer.java
+++ b/quickstep/src/com/android/quickstep/OrientationTouchTransformer.java
@@ -22,6 +22,7 @@
 import static android.view.MotionEvent.ACTION_POINTER_DOWN;
 import static android.view.MotionEvent.ACTION_UP;
 
+import static com.android.launcher3.states.RotationHelper.deltaRotation;
 import static com.android.quickstep.util.RecentsOrientedState.postDisplayRotation;
 
 import android.content.res.Resources;
@@ -138,7 +139,8 @@
      * @param info The current displayInfo
      */
     void enableMultipleRegions(boolean enableMultipleRegions, DefaultDisplay.Info info) {
-        mEnableMultipleRegions = enableMultipleRegions;
+        mEnableMultipleRegions = enableMultipleRegions &&
+                mMode != SysUINavigationMode.Mode.TWO_BUTTONS;
         if (!enableMultipleRegions) {
             mQuickStepStartingRotation = -1;
             resetSwipeRegions(info);
@@ -364,16 +366,4 @@
             return false;
         }
     }
-
-    /**
-     * @return how many factors {@param newRotation} is rotated 90 degrees clockwise.
-     * E.g. 1->Rotated by 90 degrees clockwise, 2->Rotated 180 clockwise...
-     * A value of 0 means no rotation has been applied
-     */
-    @SurfaceRotation
-    private static int deltaRotation(int oldRotation, int newRotation) {
-        int delta = newRotation - oldRotation;
-        if (delta < 0) delta += 4;
-        return delta;
-    }
 }
diff --git a/quickstep/src/com/android/quickstep/util/RecentsOrientedState.java b/quickstep/src/com/android/quickstep/util/RecentsOrientedState.java
index f72e458..eefe8ac 100644
--- a/quickstep/src/com/android/quickstep/util/RecentsOrientedState.java
+++ b/quickstep/src/com/android/quickstep/util/RecentsOrientedState.java
@@ -16,20 +16,36 @@
 
 package com.android.quickstep.util;
 
+import static android.Manifest.permission.WRITE_SECURE_SETTINGS;
+import static android.content.pm.PackageManager.PERMISSION_GRANTED;
 import static android.hardware.camera2.params.OutputConfiguration.ROTATION_180;
+import static android.util.DisplayMetrics.DENSITY_DEVICE_STABLE;
 import static android.view.Surface.ROTATION_0;
 import static android.view.Surface.ROTATION_270;
 import static android.view.Surface.ROTATION_90;
 
+import static com.android.launcher3.config.FeatureFlags.FLAG_ENABLE_FIXED_ROTATION_TRANSFORM;
+import static com.android.launcher3.states.RotationHelper.ALLOW_ROTATION_PREFERENCE_KEY;
+import static com.android.launcher3.states.RotationHelper.FIXED_ROTATION_TRANSFORM_SETTING_NAME;
+import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
 import static java.lang.annotation.RetentionPolicy.SOURCE;
 
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Resources;
+import android.database.ContentObserver;
 import android.graphics.Matrix;
 import android.graphics.RectF;
+import android.os.Handler;
+import android.provider.Settings;
+import android.util.Log;
 import android.view.MotionEvent;
 import android.view.Surface;
 
 import androidx.annotation.IntDef;
 
+import com.android.launcher3.Utilities;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.touch.PagedOrientationHandler;
 import com.android.launcher3.touch.PortraitPagedViewHandler;
@@ -44,8 +60,17 @@
  * This class has initial default state assuming the device and foreground app have
  * no ({@link Surface#ROTATION_0} rotation.
  */
-public final class RecentsOrientedState {
+public final class RecentsOrientedState implements SharedPreferences.OnSharedPreferenceChangeListener {
 
+    private static final String TAG = "RecentsOrientedState";
+    private static final boolean DEBUG = false;
+
+    private ContentObserver mSystemAutoRotateObserver = new ContentObserver(new Handler()) {
+        @Override
+        public void onChange(boolean selfChange) {
+            updateAutoRotateSetting();
+        }
+    };
     @Retention(SOURCE)
     @IntDef({ROTATION_0, ROTATION_90, ROTATION_180, ROTATION_270})
     public @interface SurfaceRotation {}
@@ -54,15 +79,45 @@
 
     private @SurfaceRotation int mTouchRotation = ROTATION_0;
     private @SurfaceRotation int mDisplayRotation = ROTATION_0;
+    private @SurfaceRotation int mLauncherRotation = Surface.ROTATION_0;
+
     /**
      * If {@code true} we default to {@link PortraitPagedViewHandler} and don't support any fake
      * launcher orientations.
      */
     private boolean mDisableMultipleOrientations;
+    private boolean mIsHomeRotationAllowed;
+    private boolean mIsSystemRotationAllowed;
+
+    private final ContentResolver mContentResolver;
+    private final SharedPreferences mSharedPrefs;
+    private final boolean mAllowConfigurationDefaultValue;
+
 
     private final Matrix mTmpMatrix = new Matrix();
     private final Matrix mTmpInverseMatrix = new Matrix();
 
+    public RecentsOrientedState(Context context) {
+        mContentResolver = context.getContentResolver();
+        mSharedPrefs = Utilities.getPrefs(context);
+
+        Resources res = context.getResources();
+        int originalSmallestWidth = res.getConfiguration().smallestScreenWidthDp
+                * res.getDisplayMetrics().densityDpi / DENSITY_DEVICE_STABLE;
+        mAllowConfigurationDefaultValue = originalSmallestWidth >= 600;
+
+        boolean isForcedRotation = Utilities.getFeatureFlagsPrefs(context)
+                .getBoolean(FLAG_ENABLE_FIXED_ROTATION_TRANSFORM, true)
+                && !mAllowConfigurationDefaultValue;
+        UI_HELPER_EXECUTOR.execute(() -> {
+            if (context.checkSelfPermission(WRITE_SECURE_SETTINGS) == PERMISSION_GRANTED) {
+                Settings.Global.putInt(mContentResolver, FIXED_ROTATION_TRANSFORM_SETTING_NAME,
+                        isForcedRotation ? 1 : 0);
+            }
+        });
+        disableMultipleOrientations(!isForcedRotation);
+    }
+
     /**
      * Sets the appropriate {@link PagedOrientationHandler} for {@link #mOrientationHandler}
      * @param touchRotation The rotation the nav bar region that is touched is in
@@ -72,19 +127,33 @@
      *         false otherwise
      */
     public boolean update(
-            @SurfaceRotation int touchRotation, @SurfaceRotation int displayRotation) {
+            @SurfaceRotation int touchRotation, @SurfaceRotation int displayRotation,
+            int launcherRotation) {
         if (!FeatureFlags.ENABLE_FIXED_ROTATION_TRANSFORM.get()) {
             return false;
         }
         if (mDisableMultipleOrientations) {
             return false;
         }
-        if (mDisplayRotation == displayRotation && mTouchRotation == touchRotation) {
+        if (mDisplayRotation == displayRotation && mTouchRotation == touchRotation
+                && launcherRotation == mLauncherRotation) {
             return false;
         }
 
+        mLauncherRotation = launcherRotation;
         mDisplayRotation = displayRotation;
         mTouchRotation = touchRotation;
+
+        if ((mIsHomeRotationAllowed && mIsSystemRotationAllowed) ||
+                mLauncherRotation == mTouchRotation) {
+            // TODO(b/153476489) Need to determine when launcher is rotated
+            mOrientationHandler = PagedOrientationHandler.HOME_ROTATED;
+            if (DEBUG) {
+                Log.d(TAG, "Set Orientation Handler: " + mOrientationHandler);
+            }
+            return true;
+        }
+
         if (mTouchRotation == ROTATION_90) {
             mOrientationHandler = PagedOrientationHandler.LANDSCAPE;
         } else if (mTouchRotation == ROTATION_270) {
@@ -92,6 +161,9 @@
         } else {
             mOrientationHandler = PagedOrientationHandler.PORTRAIT;
         }
+        if (DEBUG) {
+            Log.d(TAG, "Set Orientation Handler: " + mOrientationHandler);
+        }
         return true;
     }
 
@@ -99,8 +171,12 @@
         return mDisableMultipleOrientations;
     }
 
+    public boolean canLauncherAutoRotate() {
+        return mIsHomeRotationAllowed && mIsSystemRotationAllowed;
+    }
+
     /**
-     * Setting this preference will render future calls to {@link #update(int, int)} as a no-op.
+     * Setting this preference renders future calls to {@link #update(int, int, int)} as a no-op.
      */
     public void disableMultipleOrientations(boolean disable) {
         mDisableMultipleOrientations = disable;
@@ -110,6 +186,39 @@
         }
     }
 
+    @Override
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String s) {
+        updateHomeRotationSetting();
+    }
+
+    private void updateAutoRotateSetting() {
+        try {
+            mIsSystemRotationAllowed = Settings.System.getInt(mContentResolver,
+                    Settings.System.ACCELEROMETER_ROTATION) == 1;
+        } catch (Settings.SettingNotFoundException e) {
+            Log.e(TAG, "autorotate setting not found", e);
+        }
+    }
+
+    private void updateHomeRotationSetting() {
+        mIsHomeRotationAllowed = mSharedPrefs.getBoolean(ALLOW_ROTATION_PREFERENCE_KEY,
+                mAllowConfigurationDefaultValue);
+    }
+
+    public void init() {
+        mSharedPrefs.registerOnSharedPreferenceChangeListener(this);
+        mContentResolver.registerContentObserver(
+                Settings.System.getUriFor(Settings.System.ACCELEROMETER_ROTATION),
+                false, mSystemAutoRotateObserver);
+        updateAutoRotateSetting();
+        updateHomeRotationSetting();
+    }
+
+    public void destroy() {
+        mSharedPrefs.unregisterOnSharedPreferenceChangeListener(this);
+        mContentResolver.unregisterContentObserver(mSystemAutoRotateObserver);
+    }
+
     @SurfaceRotation
     public int getDisplayRotation() {
         return mDisplayRotation;
@@ -120,6 +229,14 @@
         return mTouchRotation;
     }
 
+    public boolean isHomeRotationAllowed() {
+        return mIsHomeRotationAllowed;
+    }
+
+    public int getLauncherRotation() {
+        return mLauncherRotation;
+    }
+
     public int getTouchRotationDegrees() {
         switch (mTouchRotation) {
             case ROTATION_90:
@@ -166,8 +283,12 @@
     }
 
     public void mapRectFromNormalOrientation(RectF src, int screenWidth, int screenHeight) {
+        mapRectFromRotation(mDisplayRotation, src, screenWidth, screenHeight);
+    }
+
+    public void mapRectFromRotation(int rotation, RectF src, int screenWidth, int screenHeight) {
         mTmpMatrix.reset();
-        postDisplayRotation(mDisplayRotation, screenWidth, screenHeight, mTmpMatrix);
+        postDisplayRotation(rotation, screenWidth, screenHeight, mTmpMatrix);
         mTmpMatrix.mapRect(src);
     }
 
@@ -192,6 +313,10 @@
         }
     }
 
+    public boolean isDisplayPhoneNatural() {
+        return mDisplayRotation == Surface.ROTATION_0 || mDisplayRotation == Surface.ROTATION_180;
+    }
+
     /**
      * Posts the transformation on the matrix representing the provided display rotation
      */
diff --git a/src/com/android/launcher3/states/RotationHelper.java b/src/com/android/launcher3/states/RotationHelper.java
index 2e0521f..3640d8b 100644
--- a/src/com/android/launcher3/states/RotationHelper.java
+++ b/src/com/android/launcher3/states/RotationHelper.java
@@ -15,47 +15,44 @@
  */
 package com.android.launcher3.states;
 
-import static android.Manifest.permission.WRITE_SECURE_SETTINGS;
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_LOCKED;
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_NOSENSOR;
-import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
-import static android.content.pm.PackageManager.PERMISSION_GRANTED;
 import static android.util.DisplayMetrics.DENSITY_DEVICE_STABLE;
 
-import static com.android.launcher3.config.FeatureFlags.FLAG_ENABLE_FIXED_ROTATION_TRANSFORM;
-import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
-
 import android.app.Activity;
 import android.content.ContentResolver;
 import android.content.SharedPreferences;
 import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
 import android.content.res.Resources;
+import android.database.ContentObserver;
+import android.os.Handler;
 import android.provider.Settings;
+import android.util.Log;
 
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.util.UiThreadHelper;
 
-import java.util.ArrayList;
-import java.util.List;
-
 /**
  * Utility class to manage launcher rotation
  */
 public class RotationHelper implements OnSharedPreferenceChangeListener {
 
+    private static final String TAG = "RotationHelper";
+
     public static final String ALLOW_ROTATION_PREFERENCE_KEY = "pref_allowRotation";
 
     public static final String FIXED_ROTATION_TRANSFORM_SETTING_NAME = "fixed_rotation_transform";
     private final ContentResolver mContentResolver;
+    private boolean mSystemAutoRotateEnabled;
 
-    /**
-     * Listener to receive changes when {@link #FIXED_ROTATION_TRANSFORM_SETTING_NAME} flag changes.
-     */
-    public interface ForcedRotationChangedListener {
-        void onForcedRotationChanged(boolean isForcedRotation);
-    }
+    private ContentObserver mSystemAutoRotateObserver = new ContentObserver(new Handler()) {
+        @Override
+        public void onChange(boolean selfChange) {
+            updateAutoRotateSetting();
+        }
+    };
 
     public static boolean getAllowRotationDefaultValue() {
         // If the device's pixel density was scaled (usually via settings for A11y), use the
@@ -72,12 +69,9 @@
 
     private final Activity mActivity;
     private final SharedPreferences mSharedPrefs;
-    private final SharedPreferences mFeatureFlagsPrefs;
 
     private boolean mIgnoreAutoRotateSettings;
-    private boolean mAutoRotateEnabled;
-    private boolean mForcedRotation;
-    private List<ForcedRotationChangedListener> mForcedRotationChangedListeners = new ArrayList<>();
+    private boolean mHomeRotationEnabled;
 
     /**
      * Rotation request made by
@@ -108,67 +102,35 @@
         if (!mIgnoreAutoRotateSettings) {
             mSharedPrefs = Utilities.getPrefs(mActivity);
             mSharedPrefs.registerOnSharedPreferenceChangeListener(this);
-            mAutoRotateEnabled = mSharedPrefs.getBoolean(ALLOW_ROTATION_PREFERENCE_KEY,
+            mHomeRotationEnabled = mSharedPrefs.getBoolean(ALLOW_ROTATION_PREFERENCE_KEY,
                     getAllowRotationDefaultValue());
         } else {
             mSharedPrefs = null;
         }
 
         mContentResolver = activity.getContentResolver();
-        mFeatureFlagsPrefs = Utilities.getFeatureFlagsPrefs(mActivity);
-        mFeatureFlagsPrefs.registerOnSharedPreferenceChangeListener(this);
-        updateForcedRotation(true);
     }
 
-    /**
-     * @param setValueFromPrefs If true, then {@link #mForcedRotation} will get set to the value
-     *                          from the home developer settings. Otherwise it will not.
-     *                          This is primarily to allow tests to set their own conditions.
-     */
-    private void updateForcedRotation(boolean setValueFromPrefs) {
-        boolean isForcedRotation = mFeatureFlagsPrefs
-                .getBoolean(FLAG_ENABLE_FIXED_ROTATION_TRANSFORM, true)
-                && !getAllowRotationDefaultValue();
-        if (mForcedRotation == isForcedRotation) {
-            return;
+    private void updateAutoRotateSetting() {
+        int autoRotateEnabled = 0;
+        try {
+            autoRotateEnabled = Settings.System.getInt(mContentResolver,
+                    Settings.System.ACCELEROMETER_ROTATION);
+        } catch (Settings.SettingNotFoundException e) {
+            Log.e(TAG, "autorotate setting not found", e);
         }
-        if (setValueFromPrefs) {
-            mForcedRotation = isForcedRotation;
-        }
-        UI_HELPER_EXECUTOR.execute(() -> {
-            if (mActivity.checkSelfPermission(WRITE_SECURE_SETTINGS) == PERMISSION_GRANTED) {
-                Settings.Global.putInt(mContentResolver, FIXED_ROTATION_TRANSFORM_SETTING_NAME,
-                            mForcedRotation ? 1 : 0);
-            }
-        });
-        for (ForcedRotationChangedListener listener : mForcedRotationChangedListeners) {
-            listener.onForcedRotationChanged(mForcedRotation);
-        }
-    }
 
-    /**
-     * will not be called when first registering the listener.
-     */
-    public void addForcedRotationCallback(ForcedRotationChangedListener listener) {
-        mForcedRotationChangedListeners.add(listener);
-    }
-
-    public void removeForcedRotationCallback(ForcedRotationChangedListener listener) {
-        mForcedRotationChangedListeners.remove(listener);
+        mSystemAutoRotateEnabled = autoRotateEnabled == 1;
     }
 
     @Override
     public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String s) {
-        if (FLAG_ENABLE_FIXED_ROTATION_TRANSFORM.equals(s)) {
-            updateForcedRotation(true);
-            return;
-        }
-
-        boolean wasRotationEnabled = mAutoRotateEnabled;
-        mAutoRotateEnabled = mSharedPrefs.getBoolean(ALLOW_ROTATION_PREFERENCE_KEY,
+        boolean wasRotationEnabled = mHomeRotationEnabled;
+        mHomeRotationEnabled = mSharedPrefs.getBoolean(ALLOW_ROTATION_PREFERENCE_KEY,
                 getAllowRotationDefaultValue());
-        if (mAutoRotateEnabled != wasRotationEnabled) {
+        if (mHomeRotationEnabled != wasRotationEnabled) {
             notifyChange();
+            updateAutoRotateSetting();
         }
     }
 
@@ -197,10 +159,6 @@
     public void forceAllowRotationForTesting(boolean allowRotation) {
         mIgnoreAutoRotateSettings =
                 allowRotation || mActivity.getResources().getBoolean(R.bool.allow_rotation);
-        // TODO(b/150214193) Tests currently expect launcher to be able to be rotated
-        //   Modify tests for this new behavior
-        mForcedRotation = !allowRotation;
-        updateForcedRotation(false);
         notifyChange();
     }
 
@@ -208,6 +166,11 @@
         if (!mInitialized) {
             mInitialized = true;
             notifyChange();
+
+            mContentResolver.registerContentObserver(
+                    Settings.System.getUriFor(Settings.System.ACCELEROMETER_ROTATION),
+                    false, mSystemAutoRotateObserver);
+            updateAutoRotateSetting();
         }
     }
 
@@ -217,8 +180,7 @@
             if (mSharedPrefs != null) {
                 mSharedPrefs.unregisterOnSharedPreferenceChangeListener(this);
             }
-            mForcedRotationChangedListeners.clear();
-            mFeatureFlagsPrefs.unregisterOnSharedPreferenceChangeListener(this);
+            mContentResolver.unregisterContentObserver(mSystemAutoRotateObserver);
         }
     }
 
@@ -228,10 +190,7 @@
         }
 
         final int activityFlags;
-        if (mForcedRotation) {
-            // TODO(b/150214193) Properly address this
-            activityFlags = SCREEN_ORIENTATION_PORTRAIT;
-        } else if (mStateHandlerRequest != REQUEST_NONE) {
+        if (mStateHandlerRequest != REQUEST_NONE) {
             activityFlags = mStateHandlerRequest == REQUEST_LOCK ?
                     SCREEN_ORIENTATION_LOCKED : SCREEN_ORIENTATION_UNSPECIFIED;
         } else if (mCurrentTransitionRequest != REQUEST_NONE) {
@@ -240,7 +199,7 @@
         } else if (mCurrentStateRequest == REQUEST_LOCK) {
             activityFlags = SCREEN_ORIENTATION_LOCKED;
         } else if (mIgnoreAutoRotateSettings || mCurrentStateRequest == REQUEST_ROTATE
-                || mAutoRotateEnabled) {
+                || mHomeRotationEnabled) {
             activityFlags = SCREEN_ORIENTATION_UNSPECIFIED;
         } else {
             // If auto rotation is off, allow rotation on the activity, in case the user is using
@@ -253,11 +212,23 @@
         }
     }
 
+    /**
+     * @return how many factors {@param newRotation} is rotated 90 degrees clockwise.
+     * E.g. 1->Rotated by 90 degrees clockwise, 2->Rotated 180 clockwise...
+     * A value of 0 means no rotation has been applied
+     */
+    public static int deltaRotation(int oldRotation, int newRotation) {
+        int delta = newRotation - oldRotation;
+        if (delta < 0) delta += 4;
+        return delta;
+    }
+
     @Override
     public String toString() {
         return String.format("[mStateHandlerRequest=%d, mCurrentStateRequest=%d,"
-                + " mLastActivityFlags=%d, mIgnoreAutoRotateSettings=%b, mAutoRotateEnabled=%b]",
+                + " mLastActivityFlags=%d, mIgnoreAutoRotateSettings=%b, mHomeRotationEnabled=%b,"
+                        + " mSystemAutoRotateEnabled=%b]",
                 mStateHandlerRequest, mCurrentStateRequest, mLastActivityFlags,
-                mIgnoreAutoRotateSettings, mAutoRotateEnabled);
+                mIgnoreAutoRotateSettings, mHomeRotationEnabled, mSystemAutoRotateEnabled);
     }
 }
diff --git a/src/com/android/launcher3/touch/HomeRotatedPageHandler.java b/src/com/android/launcher3/touch/HomeRotatedPageHandler.java
new file mode 100644
index 0000000..710b676
--- /dev/null
+++ b/src/com/android/launcher3/touch/HomeRotatedPageHandler.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.touch;
+
+import android.graphics.RectF;
+import android.view.Surface;
+
+public class HomeRotatedPageHandler extends PortraitPagedViewHandler {
+    @Override
+    public void offsetTaskRect(RectF rect, float value, int displayRotation, int launcherRotation) {
+        if (launcherRotation == Surface.ROTATION_0) {
+            super.offsetTaskRect(rect, value, displayRotation, launcherRotation);
+        } else if (launcherRotation == Surface.ROTATION_90) {
+            if (displayRotation == Surface.ROTATION_0) {
+                rect.offset(0, value);
+            } else if (displayRotation == Surface.ROTATION_90) {
+                rect.offset(value, 0);
+            } else if (displayRotation == Surface.ROTATION_180) {
+                rect.offset(-value, 0);
+            } else {
+                rect.offset(-value, 0);
+            }
+        } else if (launcherRotation == Surface.ROTATION_270) {
+            if (displayRotation == Surface.ROTATION_0) {
+                rect.offset(0, -value);
+            } else if (displayRotation == Surface.ROTATION_90) {
+                rect.offset(value, 0);
+            } else if (displayRotation == Surface.ROTATION_180) {
+                rect.offset(0, -value);
+            } else {
+                rect.offset(value, 0);
+            }
+        } // TODO (b/149609488) handle 180 case as well
+    }
+}
diff --git a/src/com/android/launcher3/touch/LandscapePagedViewHandler.java b/src/com/android/launcher3/touch/LandscapePagedViewHandler.java
index bab5747..f9f3bf4 100644
--- a/src/com/android/launcher3/touch/LandscapePagedViewHandler.java
+++ b/src/com/android/launcher3/touch/LandscapePagedViewHandler.java
@@ -78,6 +78,11 @@
     }
 
     @Override
+    public boolean isLayoutNaturalToLauncher() {
+        return false;
+    }
+
+    @Override
     public void adjustFloatingIconStartVelocity(PointF velocity) {
         float oldX = velocity.x;
         float oldY = velocity.y;
@@ -182,7 +187,7 @@
     }
 
     @Override
-    public void offsetTaskRect(RectF rect, float value, int displayRotation) {
+    public void offsetTaskRect(RectF rect, float value, int displayRotation, int launcherRotation) {
         if (displayRotation == Surface.ROTATION_0) {
             rect.offset(0, value);
         } else if (displayRotation == Surface.ROTATION_90) {
diff --git a/src/com/android/launcher3/touch/PagedOrientationHandler.java b/src/com/android/launcher3/touch/PagedOrientationHandler.java
index 50606ec..ba4c064 100644
--- a/src/com/android/launcher3/touch/PagedOrientationHandler.java
+++ b/src/com/android/launcher3/touch/PagedOrientationHandler.java
@@ -42,6 +42,7 @@
     PagedOrientationHandler PORTRAIT = new PortraitPagedViewHandler();
     PagedOrientationHandler LANDSCAPE = new LandscapePagedViewHandler();
     PagedOrientationHandler SEASCAPE = new SeascapePagedViewHandler();
+    PagedOrientationHandler HOME_ROTATED = new HomeRotatedPageHandler();
 
     interface Int2DAction<T> {
         void call(T target, int x, int y);
@@ -79,7 +80,7 @@
     void setMaxScroll(AccessibilityEvent event, int maxScroll);
     boolean getRecentsRtlSetting(Resources resources);
     float getDegreesRotated();
-    void offsetTaskRect(RectF rect, float value, int delta);
+    void offsetTaskRect(RectF rect, float value, int delta, int launcherRotation);
     int getPrimaryValue(int x, int y);
     int getSecondaryValue(int x, int y);
     void delegateScrollTo(PagedView pagedView, int secondaryScroll, int primaryScroll);
@@ -89,6 +90,7 @@
     void scrollerStartScroll(OverScroller scroller, int newPosition);
     void getCurveProperties(PagedView view, Rect insets, CurveProperties out);
     boolean isGoingUp(float displacement);
+    boolean isLayoutNaturalToLauncher();
 
     /**
      * Maps the velocity from the coordinate plane of the foreground app to that
diff --git a/src/com/android/launcher3/touch/PortraitPagedViewHandler.java b/src/com/android/launcher3/touch/PortraitPagedViewHandler.java
index 245138f..7c44eba 100644
--- a/src/com/android/launcher3/touch/PortraitPagedViewHandler.java
+++ b/src/com/android/launcher3/touch/PortraitPagedViewHandler.java
@@ -78,6 +78,11 @@
     }
 
     @Override
+    public boolean isLayoutNaturalToLauncher() {
+        return true;
+    }
+
+    @Override
     public void adjustFloatingIconStartVelocity(PointF velocity) {
         //no-op
     }
@@ -180,7 +185,7 @@
     }
 
     @Override
-    public void offsetTaskRect(RectF rect, float value, int displayRotation) {
+    public void offsetTaskRect(RectF rect, float value, int displayRotation, int launcherRotation) {
         if (displayRotation == Surface.ROTATION_0) {
             rect.offset(value, 0);
         } else if (displayRotation == Surface.ROTATION_90) {
diff --git a/src/com/android/launcher3/touch/SeascapePagedViewHandler.java b/src/com/android/launcher3/touch/SeascapePagedViewHandler.java
index eebd87f..5ce8a57 100644
--- a/src/com/android/launcher3/touch/SeascapePagedViewHandler.java
+++ b/src/com/android/launcher3/touch/SeascapePagedViewHandler.java
@@ -36,7 +36,7 @@
     }
 
     @Override
-    public void offsetTaskRect(RectF rect, float value, int displayRotation) {
+    public void offsetTaskRect(RectF rect, float value, int displayRotation, int launcherRotation) {
         if (displayRotation == Surface.ROTATION_0) {
             rect.offset(0, value);
         } else if (displayRotation == Surface.ROTATION_90) {
diff --git a/src/com/android/launcher3/views/FloatingIconView.java b/src/com/android/launcher3/views/FloatingIconView.java
index e114cf8..5b3840f 100644
--- a/src/com/android/launcher3/views/FloatingIconView.java
+++ b/src/com/android/launcher3/views/FloatingIconView.java
@@ -124,7 +124,6 @@
         super.onAttachedToWindow();
         if (!mIsOpening) {
             getViewTreeObserver().addOnGlobalLayoutListener(this);
-            mLauncher.getRotationHelper().setCurrentTransitionRequest(REQUEST_LOCK);
         }
     }