Do not let pattern be dragged

Test: drag accross pattern
Test: start dragging from edges
Test: start drawing, drag outside the bounds
Test: repeat on small and large device
Fixes: 132687980
Change-Id: Idab9279dd7cb002cbd43aab0ce1d48f265d39f04
diff --git a/core/java/com/android/internal/widget/LockPatternView.java b/core/java/com/android/internal/widget/LockPatternView.java
index 2218267..3f6c4d4 100644
--- a/core/java/com/android/internal/widget/LockPatternView.java
+++ b/core/java/com/android/internal/widget/LockPatternView.java
@@ -627,6 +627,13 @@
     }
 
     /**
+     * If there are any cells being drawn.
+     */
+    public boolean isEmpty() {
+        return mPattern.isEmpty();
+    }
+
+    /**
      * Clear the pattern lookup table. Also reset the line fade start times for
      * the next attempt.
      */
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardPatternView.java b/packages/SystemUI/src/com/android/keyguard/KeyguardPatternView.java
index 362ead3..55ddfc3 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardPatternView.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardPatternView.java
@@ -248,7 +248,8 @@
 
     @Override
     public boolean disallowInterceptTouch(MotionEvent event) {
-        return mLockPatternScreenBounds.contains((int) event.getRawX(), (int) event.getRawY());
+        return !mLockPatternView.isEmpty()
+                || mLockPatternScreenBounds.contains((int) event.getRawX(), (int) event.getRawY());
     }
 
     /** TODO: hook this up */
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardSecurityContainer.java b/packages/SystemUI/src/com/android/keyguard/KeyguardSecurityContainer.java
index b6f42df..69630c4 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardSecurityContainer.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardSecurityContainer.java
@@ -271,8 +271,7 @@
         mSwipeUpToRetry = mUnlockMethodCache.isUnlockingWithFacePossible()
                 && securityMode != SecurityMode.SimPin
                 && securityMode != SecurityMode.SimPuk
-                && securityMode != SecurityMode.None
-                && securityMode != SecurityMode.Pattern;
+                && securityMode != SecurityMode.None;
     }
 
     public CharSequence getTitle() {