From 4d5af6dd64bf778ed34bf3f0e223ecb9395a1629 Mon Sep 17 00:00:00 2001
From: Heinrich Reimer <heinrich@heinrichreimersoftware.com>
Date: Thu, 1 Sep 2016 16:02:44 +0200
Subject: [PATCH] Fixes #113

---
 .../view/SwipeBlockableViewPager.java         | 48 ++++++++++++-------
 1 file changed, 31 insertions(+), 17 deletions(-)

diff --git a/library/src/main/java/com/heinrichreimersoftware/materialintro/view/SwipeBlockableViewPager.java b/library/src/main/java/com/heinrichreimersoftware/materialintro/view/SwipeBlockableViewPager.java
index 3349857..90c2d1d 100644
--- a/library/src/main/java/com/heinrichreimersoftware/materialintro/view/SwipeBlockableViewPager.java
+++ b/library/src/main/java/com/heinrichreimersoftware/materialintro/view/SwipeBlockableViewPager.java
@@ -2,6 +2,7 @@
 
 import android.content.Context;
 import android.support.annotation.IntDef;
+import android.support.v4.view.PagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
@@ -21,7 +22,7 @@ public class SwipeBlockableViewPager extends ViewPager {
 
     private static final int SWIPE_DIRECTION_RIGHT = -1;
 
-    private static final int SWIPE_THRESHOLD = 5;
+    private static final int SWIPE_THRESHOLD = 0;
 
     private float initialX;
 
@@ -29,6 +30,8 @@ public class SwipeBlockableViewPager extends ViewPager {
 
     private boolean swipeLeftEnabled = true;
 
+    private boolean locked = false;
+
     public SwipeBlockableViewPager(Context context) {
         super(context);
     }
@@ -37,40 +40,51 @@ public SwipeBlockableViewPager(Context context, AttributeSet attrs) {
         super(context, attrs);
     }
 
-    public boolean isSwipeRightEnabled() {
-        return swipeRightEnabled;
-    }
-
     public void setSwipeRightEnabled(boolean swipeRightEnabled) {
         this.swipeRightEnabled = swipeRightEnabled;
     }
 
-    public boolean isSwipeLeftEnabled() {
-        return swipeLeftEnabled;
-    }
-
     public void setSwipeLeftEnabled(boolean swipeLeftEnabled) {
         this.swipeLeftEnabled = swipeLeftEnabled;
     }
 
     @Override
     public boolean onTouchEvent(MotionEvent event) {
-        if (getSwipeDirection(event) == SWIPE_DIRECTION_RIGHT && !swipeRightEnabled) {
-            return false;
-        } else if (getSwipeDirection(event) == SWIPE_DIRECTION_LEFT && !swipeLeftEnabled) {
-            return false;
-        }
-        return super.onTouchEvent(event);
+        return handleTouchEvent(event) && super.onTouchEvent(event);
     }
 
     @Override
     public boolean onInterceptTouchEvent(MotionEvent event) {
+        return handleTouchEvent(event) && super.onInterceptTouchEvent(event);
+    }
+
+    private boolean handleTouchEvent(MotionEvent event) {
         if (getSwipeDirection(event) == SWIPE_DIRECTION_RIGHT && !swipeRightEnabled) {
+            if (!locked) {
+                updatePosition();
+                locked = true;
+            }
             return false;
-        } else if (getSwipeDirection(event) == SWIPE_DIRECTION_LEFT && !swipeLeftEnabled) {
+        }
+        else if (getSwipeDirection(event) == SWIPE_DIRECTION_LEFT && !swipeLeftEnabled) {
+            if (!locked) {
+                updatePosition();
+                locked = true;
+            }
             return false;
         }
-        return super.onInterceptTouchEvent(event);
+        locked = false;
+        return true;
+    }
+
+    private void updatePosition() {
+        int currentItem = getCurrentItem();
+        scrollTo(currentItem * getWidth(), getScrollY());
+        PagerAdapter adapter = getAdapter();
+        if (adapter != null) {
+            adapter.notifyDataSetChanged();
+        }
+        setCurrentItem(currentItem);
     }
 
     @SwipeDirection