From a713516eb2fdeb5995523d95dfea3a2e4a5fd538 Mon Sep 17 00:00:00 2001
From: "Adam.Katz" <adam.katz@02CORM-QHCY4LGP.local>
Date: Thu, 21 Dec 2023 23:01:50 +0200
Subject: [PATCH] feat: added sensitivity controller to android

---
 .../reactnativepagerview/PagerViewViewManagerImpl.kt  | 11 +++++++++++
 .../com/reactnativepagerview/PagerViewViewManager.kt  |  7 +++++++
 src/PagerViewNativeComponent.ts                       |  3 +++
 3 files changed, 21 insertions(+)

diff --git a/android/src/main/java/com/reactnativepagerview/PagerViewViewManagerImpl.kt b/android/src/main/java/com/reactnativepagerview/PagerViewViewManagerImpl.kt
index 0abf6682..39afb909 100644
--- a/android/src/main/java/com/reactnativepagerview/PagerViewViewManagerImpl.kt
+++ b/android/src/main/java/com/reactnativepagerview/PagerViewViewManagerImpl.kt
@@ -3,6 +3,7 @@ package com.reactnativepagerview
 import android.view.View
 import androidx.viewpager2.widget.ViewPager2
 import com.facebook.react.uimanager.PixelUtil
+import androidx.recyclerview.widget.RecyclerView
 
 object PagerViewViewManagerImpl {
     const val NAME = "RNCViewPager"
@@ -20,6 +21,16 @@ object PagerViewViewManagerImpl {
         view.setCurrentItem(selectedTab, scrollSmooth)
     }
 
+    fun ViewPager2.reduceDragSensitivity(value: Int) {
+        val recyclerViewField = ViewPager2::class.java.getDeclaredField("mRecyclerView")
+        recyclerViewField.isAccessible = true
+       val recyclerView = recyclerViewField.get(this) as RecyclerView
+       val touchSlopField = RecyclerView::class.java.getDeclaredField("mTouchSlop")
+       touchSlopField.isAccessible = true
+       val touchSlop = touchSlopField.get(recyclerView) as Int
+       touchSlopField.set(recyclerView, touchSlop*value)
+    }
+
     fun addView(host: NestedScrollableHost, child: View?, index: Int) {
         if (child == null) {
             return
diff --git a/android/src/paper/java/com/reactnativepagerview/PagerViewViewManager.kt b/android/src/paper/java/com/reactnativepagerview/PagerViewViewManager.kt
index 4d0adffe..1ed255af 100644
--- a/android/src/paper/java/com/reactnativepagerview/PagerViewViewManager.kt
+++ b/android/src/paper/java/com/reactnativepagerview/PagerViewViewManager.kt
@@ -13,6 +13,7 @@ import com.facebook.react.uimanager.UIManagerModule
 import com.facebook.react.uimanager.ViewGroupManager
 import com.facebook.react.uimanager.annotations.ReactProp
 import com.facebook.react.uimanager.events.EventDispatcher
+import com.reactnativepagerview.PagerViewViewManagerImpl.reduceDragSensitivity
 import com.reactnativepagerview.event.PageScrollEvent
 import com.reactnativepagerview.event.PageScrollStateChangedEvent
 import com.reactnativepagerview.event.PageSelectedEvent
@@ -125,6 +126,12 @@ class PagerViewViewManager : ViewGroupManager<NestedScrollableHost>() {
         PagerViewViewManagerImpl.setLayoutDirection(host, value)
     }
 
+    @ReactProp(name = "scrollSensitivity", defaultInt = 2)
+   fun setScrollSensitivity(host: NestedScrollableHost, value: Int) {
+       val view = PagerViewViewManagerImpl.getViewPager(host)
+       view.reduceDragSensitivity(value)
+   }
+
     override fun getExportedCustomDirectEventTypeConstants(): MutableMap<String, Map<String, String>> {
         return MapBuilder.of(
                 PageScrollEvent.EVENT_NAME, MapBuilder.of("registrationName", "onPageScroll"),
diff --git a/src/PagerViewNativeComponent.ts b/src/PagerViewNativeComponent.ts
index f102aa96..7fe3ab63 100644
--- a/src/PagerViewNativeComponent.ts
+++ b/src/PagerViewNativeComponent.ts
@@ -22,6 +22,8 @@ export type OnPageScrollStateChangedEventData = Readonly<{
   pageScrollState: 'idle' | 'dragging' | 'settling';
 }>;
 
+export type ScrollSensitivity = 2 | 3 | 4 | 5 | 6 | 7 | 8;
+
 export interface NativeProps extends ViewProps {
   scrollEnabled?: WithDefault<boolean, true>;
   layoutDirection?: WithDefault<'ltr' | 'rtl', 'ltr'>;
@@ -35,6 +37,7 @@ export interface NativeProps extends ViewProps {
   onPageScroll?: DirectEventHandler<OnPageScrollEventData>;
   onPageSelected?: DirectEventHandler<OnPageSelectedEventData>;
   onPageScrollStateChanged?: DirectEventHandler<OnPageScrollStateChangedEventData>;
+  scrollSensitivity?: ScrollSensitivity;
 }
 
 type PagerViewViewType = HostComponent<NativeProps>;