Adding accessibility scroll support to PagedView.

1. Added support for accessibility scroll action to
   PagedView.

2. Exposed AppsCustomizePagedView and Workspace for
   acessibility if otherwise specified.

bug:5932640

Change-Id: I812e7c285cbc4d925390b9fae48a18acc68432ce

3 files changed, 40 insertions, 1 deletions

diff --git a/src/com/android/launcher2/AppsCustomizePagedView.java b/src/com/android/launcher2/AppsCustomizePagedView.java
index 5c91d35cc..358054535 100644
--- a/src/com/android/launcher2/AppsCustomizePagedView.java
+++ b/src/com/android/launcher2/AppsCustomizePagedView.java
@@ -279,6 +279,11 @@ public class AppsCustomizePagedView extends PagedViewWithDraggableItems implemen
         mWidgetPreviewIconPaddedDimension =
             (int) (mAppIconSize * (1 + (2 * sWidgetPreviewIconPaddingPercentage)));
         mFadeInAdjacentScreens = false;
+
+        // Unless otherwise specified this view is important for accessibility.
+        if (getImportantForAccessibility() == View.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
+            setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
+        }
     }
 
     @Override
diff --git a/src/com/android/launcher2/PagedView.java b/src/com/android/launcher2/PagedView.java
index 5d9cf81eb..02f1c22b8 100644
--- a/src/com/android/launcher2/PagedView.java
+++ b/src/com/android/launcher2/PagedView.java
@@ -24,6 +24,7 @@ import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Canvas;
 import android.graphics.Rect;
+import android.os.Bundle;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.util.AttributeSet;
@@ -1854,7 +1855,13 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
     @Override
     public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
         super.onInitializeAccessibilityNodeInfo(info);
-        info.setScrollable(true);
+        info.setScrollable(getPageCount() > 1);
+        if (getCurrentPage() < getPageCount() - 1) {
+            info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
+        }
+        if (getCurrentPage() > 0) {
+            info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
+        }
     }
 
     @Override
@@ -1868,6 +1875,28 @@ public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarc
         }
     }
 
+    @Override
+    public boolean performAccessibilityAction(int action, Bundle arguments) {
+        if (super.performAccessibilityAction(action, arguments)) {
+            return true;
+        }
+        switch (action) {
+            case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
+                if (getCurrentPage() < getPageCount() - 1) {
+                    scrollRight();
+                    return true;
+                }
+            } break;
+            case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
+                if (getCurrentPage() > 0) {
+                    scrollLeft();
+                    return true;
+                }
+            } break;
+        }
+        return false;
+    }
+
     protected String getCurrentPageDescription() {
         return String.format(getContext().getString(R.string.default_scroll_format),
                  getNextPage() + 1, getChildCount());
diff --git a/src/com/android/launcher2/Workspace.java b/src/com/android/launcher2/Workspace.java
index d15d31843..00684bdfc 100644
--- a/src/com/android/launcher2/Workspace.java
+++ b/src/com/android/launcher2/Workspace.java
@@ -342,6 +342,11 @@ public class Workspace extends SmoothPagedView
 
         // Disable multitouch across the workspace/all apps/customize tray
         setMotionEventSplittingEnabled(true);
+
+        // Unless otherwise specified this view is important for accessibility.
+        if (getImportantForAccessibility() == View.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
+            setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
+        }
     }
 
     // estimate the size of a widget with spans hSpan, vSpan. return MAX_VALUE for each