Remove the accessibility focus search code.

1. In JellyBean we have added some APIs to search for next accessibility
   focus in various directions and set accessibility focus from hover.
   However, we have decided that there is not clean answer for how this
   should behave and the APIs were hidden. Now the accessibility service
  is responsible for that. The unused code is now taken out.

2. This patch also takes out the hidden attribute accessibiligyFocusable
   since we moved the responsibility for implementing focus search strategy
   to accessibility services and we did not need that for Jellybean which
   is a good sign that this is not needed. I general this is one less thing
   for an app developer to worry about. We can add this if needed later.

bug:6773816

Change-Id: I0c858d72c93a2b7ff1f8f35a08d33ec4b9eb85fd

1 files changed, 4 insertions, 231 deletions

diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
index b6f0aa2c9eee..3af1a3ecdb24 100644
--- a/core/java/android/view/View.java
+++ b/core/java/android/view/View.java
@@ -1007,14 +1007,6 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
     public static final int FOCUSABLES_TOUCH_MODE = 0x00000001;
 
     /**
-     * View flag indicating whether {@link #addFocusables(ArrayList, int, int)}
-     * should add only accessibility focusable Views.
-     *
-     * @hide
-     */
-    public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002;
-
-    /**
      * Use with {@link #focusSearch(int)}. Move focus to the previous selectable
      * item.
      */
@@ -1046,58 +1038,6 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
      */
     public static final int FOCUS_DOWN = 0x00000082;
 
-    // Accessibility focus directions.
-
-    /**
-     * The accessibility focus which is the current user position when
-     * interacting with the accessibility framework.
-     *
-     * @hide
-     */
-    public static final int FOCUS_ACCESSIBILITY =  0x00001000;
-
-    /**
-     * Use with {@link #focusSearch(int)}. Move acessibility focus left.
-     *
-     * @hide
-     */
-    public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY;
-
-    /**
-     * Use with {@link #focusSearch(int)}. Move acessibility focus up.
-     *
-     * @hide
-     */
-    public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY;
-
-    /**
-     * Use with {@link #focusSearch(int)}. Move acessibility focus right.
-     *
-     * @hide
-     */
-    public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY;
-
-    /**
-     * Use with {@link #focusSearch(int)}. Move acessibility focus down.
-     *
-     * @hide
-     */
-    public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY;
-
-    /**
-     * Use with {@link #focusSearch(int)}. Move acessibility focus forward.
-     *
-     * @hide
-     */
-    public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY;
-
-    /**
-     * Use with {@link #focusSearch(int)}. Move acessibility focus backward.
-     *
-     * @hide
-     */
-    public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY;
-
     /**
      * Bits of {@link #getMeasuredWidthAndState()} and
      * {@link #getMeasuredWidthAndState()} that provide the actual measured size.
@@ -2135,71 +2075,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
      */
     static final int VIEW_QUICK_REJECTED = 0x10000000;
 
-    // Accessiblity constants for mPrivateFlags2
-
-    /**
-     * Shift for the bits in {@link #mPrivateFlags2} related to the
-     * "accessibilityFocusable" attribute.
-     */
-    static final int ACCESSIBILITY_FOCUSABLE_SHIFT = 29;
-
-    /**
-     * The system determines whether the view can take accessibility focus - default (recommended).
-     * <p>
-     * Such a view is consideted by the focus search if it is:
-     * <ul>
-     * <li>
-     * Important for accessibility and actionable (clickable, long clickable, focusable)
-     * </li>
-     * <li>
-     * Important for accessibility, not actionable (clickable, long clickable, focusable),
-     * and does not have an actionable predecessor.
-     * </li>
-     * </ul>
-     * An accessibility srvice can request putting accessibility focus on such a view.
-     * </p>
-     *
-     * @hide
-     */
-    public static final int ACCESSIBILITY_FOCUSABLE_AUTO = 0x00000000;
-
-    /**
-     * The view can take accessibility focus.
-     * <p>
-     * A view that can take accessibility focus is always considered during focus
-     * search and an accessibility service can request putting accessibility focus
-     * on it.
-     * </p>
-     *
-     * @hide
-     */
-    public static final int ACCESSIBILITY_FOCUSABLE_YES = 0x00000001;
-
-    /**
-     * The view can not take accessibility focus.
-     * <p>
-     * A view that can not take accessibility focus is never considered during focus
-     * search and an accessibility service can not request putting accessibility focus
-     * on it.
-     * </p>
-     *
-     * @hide
-     */
-    public static final int ACCESSIBILITY_FOCUSABLE_NO = 0x00000002;
-
-    /**
-     * The default whether the view is accessiblity focusable.
-     */
-    static final int ACCESSIBILITY_FOCUSABLE_DEFAULT = ACCESSIBILITY_FOCUSABLE_AUTO;
-
-    /**
-     * Mask for obtainig the bits which specifies how to determine
-     * whether a view is accessibility focusable.
-     */
-    static final int ACCESSIBILITY_FOCUSABLE_MASK = (ACCESSIBILITY_FOCUSABLE_AUTO
-        | ACCESSIBILITY_FOCUSABLE_YES | ACCESSIBILITY_FOCUSABLE_NO)
-        << ACCESSIBILITY_FOCUSABLE_SHIFT;
-
+    // There are a couple of flags left in mPrivateFlags2
 
     /* End of masks for mPrivateFlags2 */
 
@@ -3216,8 +3092,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
         mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) |
                 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) |
                 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) |
-                (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) |
-                (ACCESSIBILITY_FOCUSABLE_DEFAULT << ACCESSIBILITY_FOCUSABLE_SHIFT);
+                (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT);
         mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
         setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS);
         mUserPaddingStart = -1;
@@ -4860,10 +4735,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
         }
 
         if (!isAccessibilityFocused()) {
-            final int mode = getAccessibilityFocusable();
-            if (mode == ACCESSIBILITY_FOCUSABLE_YES || mode == ACCESSIBILITY_FOCUSABLE_AUTO) {
-                info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
-            }
+            info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
         } else {
             info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS);
         }
@@ -6166,12 +6038,6 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
         if (views == null) {
             return;
         }
-        if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) {
-            if (isAccessibilityFocusable()) {
-                views.add(this);
-                return;
-            }
-        }
         if (!isFocusable()) {
             return;
         }
@@ -6336,29 +6202,6 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
         }
     }
 
-    private void requestAccessibilityFocusFromHover() {
-        if (includeForAccessibility() && isActionableForAccessibility()) {
-            requestAccessibilityFocus();
-        } else {
-            if (mParent != null) {
-                View nextFocus = mParent.findViewToTakeAccessibilityFocusFromHover(this, this);
-                if (nextFocus != null) {
-                    nextFocus.requestAccessibilityFocus();
-                }
-            }
-        }
-    }
-
-    private boolean canTakeAccessibilityFocusFromHover() {
-        if (includeForAccessibility() && isActionableForAccessibility()) {
-            return true;
-        }
-        if (mParent != null) {
-            return (mParent.findViewToTakeAccessibilityFocusFromHover(this, this) == this);
-        }
-        return false;
-    }
-
     /**
      * Clears accessibility focus without calling any callback methods
      * normally invoked in {@link #clearAccessibilityFocus()}. This method
@@ -6574,73 +6417,6 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
     }
 
     /**
-     * Gets the mode for determining whether this View can take accessibility focus.
-     *
-     * @return The mode for determining whether a View can take accessibility focus.
-     *
-     * @attr ref android.R.styleable#View_accessibilityFocusable
-     *
-     * @see #ACCESSIBILITY_FOCUSABLE_YES
-     * @see #ACCESSIBILITY_FOCUSABLE_NO
-     * @see #ACCESSIBILITY_FOCUSABLE_AUTO
-     *
-     * @hide
-     */
-    @ViewDebug.ExportedProperty(category = "accessibility", mapping = {
-            @ViewDebug.IntToString(from = ACCESSIBILITY_FOCUSABLE_AUTO, to = "auto"),
-            @ViewDebug.IntToString(from = ACCESSIBILITY_FOCUSABLE_YES, to = "yes"),
-            @ViewDebug.IntToString(from = ACCESSIBILITY_FOCUSABLE_NO, to = "no")
-        })
-    public int getAccessibilityFocusable() {
-        return (mPrivateFlags2 & ACCESSIBILITY_FOCUSABLE_MASK) >>> ACCESSIBILITY_FOCUSABLE_SHIFT;
-    }
-
-    /**
-     * Sets how to determine whether this view can take accessibility focus.
-     *
-     * @param mode How to determine whether this view can take accessibility focus.
-     *
-     * @attr ref android.R.styleable#View_accessibilityFocusable
-     *
-     * @see #ACCESSIBILITY_FOCUSABLE_YES
-     * @see #ACCESSIBILITY_FOCUSABLE_NO
-     * @see #ACCESSIBILITY_FOCUSABLE_AUTO
-     *
-     * @hide
-     */
-    public void setAccessibilityFocusable(int mode) {
-        if (mode != getAccessibilityFocusable()) {
-            mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSABLE_MASK;
-            mPrivateFlags2 |= (mode << ACCESSIBILITY_FOCUSABLE_SHIFT)
-                    & ACCESSIBILITY_FOCUSABLE_MASK;
-            notifyAccessibilityStateChanged();
-        }
-    }
-
-    /**
-     * Gets whether this view can take accessibility focus.
-     *
-     * @return Whether the view can take accessibility focus.
-     *
-     * @hide
-     */
-    public boolean isAccessibilityFocusable() {
-        final int mode = (mPrivateFlags2 & ACCESSIBILITY_FOCUSABLE_MASK)
-                >>> ACCESSIBILITY_FOCUSABLE_SHIFT;
-        switch (mode) {
-            case ACCESSIBILITY_FOCUSABLE_YES:
-                return true;
-            case ACCESSIBILITY_FOCUSABLE_NO:
-                return false;
-            case ACCESSIBILITY_FOCUSABLE_AUTO:
-                return canTakeAccessibilityFocusFromHover()
-                        || getAccessibilityNodeProvider() != null;
-            default:
-                throw new IllegalArgumentException("Unknow accessibility focusable mode: " + mode);
-        }
-    }
-
-    /**
      * Gets the parent for accessibility purposes. Note that the parent for
      * accessibility is not necessary the immediate parent. It is the first
      * predecessor that is important for accessibility.
@@ -6821,10 +6597,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
                 }
             } break;
             case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: {
-                final int mode = getAccessibilityFocusable();
-                if (!isAccessibilityFocused()
-                        && (mode == ACCESSIBILITY_FOCUSABLE_YES
-                                || mode == ACCESSIBILITY_FOCUSABLE_AUTO)) {
+                if (!isAccessibilityFocused()) {
                     return requestAccessibilityFocus();
                 }
             } break;