From a8f0c6ddba0e002032d6fa78a2f4635c44db6bbc Mon Sep 17 00:00:00 2001
From: Allan Wang <me@allanwang.ca>
Date: Thu, 6 Jul 2017 23:42:18 -0700
Subject: Support other axis

---
 .../ca/allanwang/kau/swipe/SwipeBackLayout.kt      |  1 +
 .../ca/allanwang/kau/swipe/ViewDragHelper.java     | 69 ++++++++++++++++++----
 .../kotlin/ca/allanwang/kau/sample/AnimActivity.kt |  2 +-
 3 files changed, 60 insertions(+), 12 deletions(-)

diff --git a/core/src/main/kotlin/ca/allanwang/kau/swipe/SwipeBackLayout.kt b/core/src/main/kotlin/ca/allanwang/kau/swipe/SwipeBackLayout.kt
index 00aa33d..63efa01 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/swipe/SwipeBackLayout.kt
+++ b/core/src/main/kotlin/ca/allanwang/kau/swipe/SwipeBackLayout.kt
@@ -115,6 +115,7 @@ class SwipeBackLayout @JvmOverloads constructor(context: Context, attrs: Attribu
             field = value
             horizontal = edgeFlag == SWIPE_EDGE_LEFT || edgeFlag == SWIPE_EDGE_RIGHT
             dragHelper.setEdgeTrackingEnabled(value)
+            dragHelper.edgeFlag = value
         }
 
     private var horizontal = true
diff --git a/core/src/main/kotlin/ca/allanwang/kau/swipe/ViewDragHelper.java b/core/src/main/kotlin/ca/allanwang/kau/swipe/ViewDragHelper.java
index 8f7f27c..3368e10 100644
--- a/core/src/main/kotlin/ca/allanwang/kau/swipe/ViewDragHelper.java
+++ b/core/src/main/kotlin/ca/allanwang/kau/swipe/ViewDragHelper.java
@@ -13,6 +13,11 @@ import android.widget.OverScroller;
 
 import java.util.Arrays;
 
+import static ca.allanwang.kau.swipe.SwipeBackHelperKt.SWIPE_EDGE_BOTTOM;
+import static ca.allanwang.kau.swipe.SwipeBackHelperKt.SWIPE_EDGE_LEFT;
+import static ca.allanwang.kau.swipe.SwipeBackHelperKt.SWIPE_EDGE_RIGHT;
+import static ca.allanwang.kau.swipe.SwipeBackHelperKt.SWIPE_EDGE_TOP;
+
 /**
  * Created by Allan Wang on 2017-07-05.
  * <p>
@@ -99,6 +104,8 @@ public class ViewDragHelper implements ViewDragHelperExtras {
     // Distance to travel before a drag may begin
     private int mTouchSlop;
 
+    public int edgeFlag = SWIPE_EDGE_LEFT;
+
     // Last known position/pointer tracking
     private int mActivePointerId = INVALID_POINTER;
     private float[] mInitialMotionX;
@@ -1221,24 +1228,64 @@ public class ViewDragHelper implements ViewDragHelperExtras {
      * @param child Child to check
      * @param dx    Motion since initial position along X axis
      * @param dy    Motion since initial position along Y axis
-     * @return 1 if the touch slop has been crossed on horizontal
+     * @return 1 if the touch slop has been crossed on our desired axis
      * -       0 if the touch slop has not been crossed
-     * -       -1 if the touch slop has been crossed on vertical
+     * -       -1 if the touch slop has been crossed on the other axis
      * -       2 if the touch slop has been crossed on both
      */
     private int checkTouchSlop(View child, float dx, float dy) {
         if (child == null) {
             return 0;
         }
-        if (dx <= mTouchSlop && Math.abs(dy) <= mTouchSlop) {
-            return 0;
-        } else if (dx > mTouchSlop && Math.abs(dy) <= mTouchSlop) {
-            mDragState = STATE_DRAGGING;
-            return 1;
-        } else if (dx <= mTouchSlop && Math.abs(dy) > mTouchSlop) {
-            mDragState = STATE_IDLE;
-            cancel();
-            return -1;
+        switch (edgeFlag) {
+            case SWIPE_EDGE_LEFT:
+                if (dx <= mTouchSlop && Math.abs(dy) <= mTouchSlop) {
+                    return 0;
+                } else if (dx > mTouchSlop && Math.abs(dy) <= mTouchSlop) {
+                    mDragState = STATE_DRAGGING;
+                    return 1;
+                } else if (dx <= mTouchSlop && Math.abs(dy) > mTouchSlop) {
+                    mDragState = STATE_IDLE;
+                    cancel();
+                    return -1;
+                }
+                break;
+            case SWIPE_EDGE_RIGHT:
+                if (dx >= -mTouchSlop && Math.abs(dy) <= mTouchSlop) {
+                    return 0;
+                } else if (dx < -mTouchSlop && Math.abs(dy) <= mTouchSlop) {
+                    mDragState = STATE_DRAGGING;
+                    return 1;
+                } else if (dx >= mTouchSlop && Math.abs(dy) > mTouchSlop) {
+                    mDragState = STATE_IDLE;
+                    cancel();
+                    return -1;
+                }
+                break;
+            case SWIPE_EDGE_TOP:
+                if (dy <= mTouchSlop && Math.abs(dx) <= mTouchSlop) {
+                    return 0;
+                } else if (dy > mTouchSlop && Math.abs(dx) <= mTouchSlop) {
+                    mDragState = STATE_DRAGGING;
+                    return 1;
+                } else if (dy <= mTouchSlop && Math.abs(dx) > mTouchSlop) {
+                    mDragState = STATE_IDLE;
+                    cancel();
+                    return -1;
+                }
+                break;
+            case SWIPE_EDGE_BOTTOM:
+                if (dy >= -mTouchSlop && Math.abs(dx) <= mTouchSlop) {
+                    return 0;
+                } else if (dy < -mTouchSlop && Math.abs(dx) <= mTouchSlop) {
+                    mDragState = STATE_DRAGGING;
+                    return 1;
+                } else if (dy >= mTouchSlop && Math.abs(dx) > mTouchSlop) {
+                    mDragState = STATE_IDLE;
+                    cancel();
+                    return -1;
+                }
+                break;
         }
         return 2;
     }
diff --git a/sample/src/main/kotlin/ca/allanwang/kau/sample/AnimActivity.kt b/sample/src/main/kotlin/ca/allanwang/kau/sample/AnimActivity.kt
index 909e71b..707a244 100644
--- a/sample/src/main/kotlin/ca/allanwang/kau/sample/AnimActivity.kt
+++ b/sample/src/main/kotlin/ca/allanwang/kau/sample/AnimActivity.kt
@@ -93,7 +93,7 @@ class AnimActivity : AppCompatActivity() {
             true
         }
         kauSwipeOnCreate {
-            edgeFlag = SWIPE_EDGE_LEFT
+            edgeFlag = SWIPE_EDGE_BOTTOM
         }
     }
 
-- 
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