Merge "Add accessibility scroll actions to TabWidget" into jb-mr1-dev

Author: sganov

core/java/android/widget/TabWidget.java

@@ -24,6 +24,7 @@
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
+import android.os.Bundle;
 import android.util.AttributeSet;
 import android.view.View;
 import android.view.View.OnFocusChangeListener;
@@ -434,6 +435,42 @@ public void sendAccessibilityEventUnchecked(AccessibilityEvent event) {
     public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
         super.onInitializeAccessibilityNodeInfo(info);
         info.setClassName(TabWidget.class.getName());
+
+        final int tabCount = getTabCount();
+
+        if (tabCount > 1) {
+            if (mSelectedTab > 0) {
+                info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
+                info.setScrollable(true);
+            }
+
+            if (mSelectedTab < (tabCount - 1)) {
+                info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
+                info.setScrollable(true);
+            }
+        }
+    }
+
+    @Override
+    public boolean performAccessibilityAction(int action, Bundle arguments) {
+        final int tabCount = getTabCount();
+
+        switch (action) {
+            case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD:
+                if ((tabCount > 1) && (mSelectedTab > 0)) {
+                    focusCurrentTab(mSelectedTab - 1);
+                    return true;
+                }
+                return false;
+            case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD:
+                if ((tabCount > 1) && (mSelectedTab < (tabCount - 1))) {
+                    focusCurrentTab(mSelectedTab + 1);
+                    return true;
+                }
+                return false;
+        }
+
+        return super.performAccessibilityAction(action, arguments);
     }
 
     /**