Fixing scrolling up in App Apps.

Done by scrolling only when scroll position is not zero. This way, the
scroll gesture can't close All Apps.

Bug: 110103162
Test: TaplTests suite
Change-Id: Icfe47d2bcc0210ae221df169d6c35cd1be10ff86

3 files changed, 70 insertions, 7 deletions

diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index 7c5bb1af8..a8513185e 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -602,4 +602,8 @@ public final class Utilities {
         msg.setAsynchronous(true);
         handler.sendMessage(msg);
     }
+
+    public interface Consumer<T> {
+        void accept(T var1);
+    }
 }
diff --git a/src/com/android/launcher3/allapps/AllAppsContainerView.java b/src/com/android/launcher3/allapps/AllAppsContainerView.java
index fdf32af6d..40cf0f3d0 100644
--- a/src/com/android/launcher3/allapps/AllAppsContainerView.java
+++ b/src/com/android/launcher3/allapps/AllAppsContainerView.java
@@ -21,6 +21,7 @@ import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.Point;
 import android.graphics.Rect;
+import android.os.Bundle;
 import android.os.Process;
 import android.support.animation.DynamicAnimation;
 import android.support.annotation.NonNull;
@@ -48,6 +49,7 @@ import com.android.launcher3.ItemInfo;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
+import com.android.launcher3.compat.AccessibilityManagerCompat;
 import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.keyboard.FocusedItemDecorator;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
@@ -549,4 +551,16 @@ public class AllAppsContainerView extends SpringRelativeLayout implements DragSo
                     && verticalFadingEdge);
         }
     }
+
+    @Override
+    public boolean performAccessibilityAction(int action, Bundle arguments) {
+        if (AccessibilityManagerCompat.processTestRequest(
+                mLauncher, "TAPL_GET_SCROLL", action, arguments,
+                response ->
+                        response.putInt("scrollY", getActiveRecyclerView().getCurrentScrollY()))) {
+            return true;
+        }
+
+        return super.performAccessibilityAction(action, arguments);
+    }
 }
diff --git a/src/com/android/launcher3/compat/AccessibilityManagerCompat.java b/src/com/android/launcher3/compat/AccessibilityManagerCompat.java
index 29fc2bc60..32fb5332c 100644
--- a/src/com/android/launcher3/compat/AccessibilityManagerCompat.java
+++ b/src/com/android/launcher3/compat/AccessibilityManagerCompat.java
@@ -18,9 +18,11 @@ package com.android.launcher3.compat;
 
 import android.accessibilityservice.AccessibilityServiceInfo;
 import android.content.Context;
+import android.os.Bundle;
 import android.view.View;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityManager;
+import android.view.accessibility.AccessibilityNodeInfo;
 
 import com.android.launcher3.Utilities;
 
@@ -49,17 +51,60 @@ public class AccessibilityManagerCompat {
     }
 
     public static void sendEventToTest(Context context, String eventTag) {
-        if (!Utilities.IS_RUNNING_IN_TEST_HARNESS) return;
+        final AccessibilityManager accessibilityManager = getAccessibilityManagerForTest(context);
+        if (accessibilityManager == null) return;
 
+        sendEventToTest(accessibilityManager, eventTag, null);
+    }
+
+    private static void sendEventToTest(
+            AccessibilityManager accessibilityManager, String eventTag, Bundle data) {
+        final AccessibilityEvent e = AccessibilityEvent.obtain(
+                AccessibilityEvent.TYPE_ANNOUNCEMENT);
+        e.setClassName(eventTag);
+        e.setParcelableData(data);
+        accessibilityManager.sendAccessibilityEvent(e);
+    }
+
+    /**
+     * Returns accessibility manager to be used for communication with UI Automation tests.
+     * The tests may exchange custom accessibility messages with the launcher; the accessibility
+     * manager is used in these communications.
+     *
+     * If the launcher runs not under a test, the return is null, and no attempt to process or send
+     * custom accessibility messages should be made.
+     */
+    private static AccessibilityManager getAccessibilityManagerForTest(Context context) {
+        // If not running in a test harness, don't participate in test exchanges.
+        if (!Utilities.IS_RUNNING_IN_TEST_HARNESS) return null;
+
+        // Additional safety check: when running under UI Automation, accessibility is enabled,
+        // but the list of accessibility services is empty. Return null if this is not the case.
         final AccessibilityManager accessibilityManager = getManager(context);
-        if (accessibilityManager.isEnabled() &&
+        if (!accessibilityManager.isEnabled() ||
                 accessibilityManager.getEnabledAccessibilityServiceList(
-                        AccessibilityServiceInfo.FEEDBACK_ALL_MASK).size() == 0) {
+                        AccessibilityServiceInfo.FEEDBACK_ALL_MASK).size() > 0) {
+            return null;
+        }
+
+        return accessibilityManager;
+    }
+
+    public static boolean processTestRequest(Context context, String eventTag, int action,
+            Bundle request, Utilities.Consumer<Bundle> responseFiller) {
+        final AccessibilityManager accessibilityManager = getAccessibilityManagerForTest(context);
+        if (accessibilityManager == null) return false;
 
-            final AccessibilityEvent e = AccessibilityEvent.obtain(
-                    AccessibilityEvent.TYPE_ANNOUNCEMENT);
-            e.setClassName(eventTag);
-            accessibilityManager.sendAccessibilityEvent(e);
+        // The test sends a request via a ACTION_SET_TEXT.
+        if (action == AccessibilityNodeInfo.ACTION_SET_TEXT &&
+                eventTag.equals(request.getCharSequence(
+                        AccessibilityNodeInfo.ACTION_ARGUMENT_SET_TEXT_CHARSEQUENCE))) {
+            final Bundle response = new Bundle();
+            responseFiller.accept(response);
+            AccessibilityManagerCompat.sendEventToTest(
+                    accessibilityManager, eventTag + "_RESPONSE", response);
+            return true;
         }
+        return false;
     }
 }