Keyguard - fix overzealous sliding security view

Bug 7453429

Change the detection of sliding the security view to require crossing
the border between sections in the correct direction. This also
improves the feel of re-opening the slider.

Change-Id: I57797f926e017ea2cf41f7c48e0fe77ac0f78460

Author: adamp

policy/src/com/android/internal/policy/impl/keyguard/SlidingChallengeLayout.java

@@ -16,6 +16,8 @@
 
 package com.android.internal.policy.impl.keyguard;
 
+import com.android.internal.R;
+
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
@@ -29,7 +31,6 @@
 import android.util.AttributeSet;
 import android.util.FloatProperty;
 import android.util.Log;
-import android.util.MathUtils;
 import android.util.Property;
 import android.view.MotionEvent;
 import android.view.VelocityTracker;
@@ -40,8 +41,6 @@
 import android.view.animation.Interpolator;
 import android.widget.Scroller;
 
-import com.android.internal.R;
-
 /**
  * This layout handles interaction with the sliding security challenge views
  * that overlay/resize other keyguard contents.
@@ -53,7 +52,7 @@ public class SlidingChallengeLayout extends ViewGroup implements ChallengeLayout
     // The drag handle is measured in dp above & below the top edge of the
     // challenge view; these parameters change based on whether the challenge 
     // is open or closed.
-    private static final int DRAG_HANDLE_CLOSED_ABOVE = 64; // dp
+    private static final int DRAG_HANDLE_CLOSED_ABOVE = 8; // dp
     private static final int DRAG_HANDLE_CLOSED_BELOW = 0; // dp
     private static final int DRAG_HANDLE_OPEN_ABOVE = 8; // dp
     private static final int DRAG_HANDLE_OPEN_BELOW = 0; // dp
@@ -581,18 +580,16 @@ public boolean onInterceptTouchEvent(MotionEvent ev) {
                     final float x = ev.getX(i);
                     final float y = ev.getY(i);
                     if (!mIsBouncing && mActivePointerId == INVALID_POINTER
-                                && ((isInDragHandle(x, y) && MathUtils.sq(x - mGestureStartX)
-                                        + MathUtils.sq(y - mGestureStartY) > mTouchSlopSquare)
-                                || crossedDragHandle(x, y, mGestureStartY)
+                                && (crossedDragHandle(x, y, mGestureStartY)
                                 || (isInChallengeView(x, y) &&
-                                       mScrollState == SCROLL_STATE_SETTLING))) {
+                                        mScrollState == SCROLL_STATE_SETTLING))) {
                         mActivePointerId = ev.getPointerId(i);
                         mGestureStartX = x;
                         mGestureStartY = y;
                         mGestureStartChallengeBottom = getChallengeBottom();
                         mDragging = true;
                         mChallengeView.setLayerType(LAYER_TYPE_HARDWARE, null);
-                    } else if (isInChallengeView(x, y)) {
+                    } else if (mChallengeShowing && isInChallengeView(x, y)) {
                         mBlockDrag = true;
                     }
                 }
@@ -767,11 +764,19 @@ private boolean isPointInView(float x, float y, View view) {
     }
 
     private boolean crossedDragHandle(float x, float y, float initialY) {
+
         final int challengeTop = mChallengeView.getTop();
-        return  x >= 0 &&
-                x < getWidth() &&
-                initialY < (challengeTop - getDragHandleSizeAbove()) &&
-                y > challengeTop + getDragHandleSizeBelow();
+        final boolean horizOk = x >= 0 && x < getWidth();
+
+        final boolean vertOk;
+        if (mChallengeShowing) {
+            vertOk = initialY < (challengeTop - getDragHandleSizeAbove()) &&
+                    y > challengeTop + getDragHandleSizeBelow();
+        } else {
+            vertOk = initialY > challengeTop + getDragHandleSizeBelow() &&
+                    y < challengeTop - getDragHandleSizeAbove();
+        }
+        return horizOk && vertOk;
     }
 
     @Override