From f377b92f396097b1c4213f2eb84f1e8e6794226d Mon Sep 17 00:00:00 2001
From: Haruki Yano <haruki.y.11g@gmail.com>
Date: Tue, 2 Nov 2021 00:32:59 +0900
Subject: [PATCH] Fixed to work property when under the scroll rect.

---
 Assets/Demo/Scenes/CarouselDemo.unity         | 13 +++
 .../Runtime/Scripts/CarouselView.cs           |  1 +
 .../Runtime/Scripts/ScrollEventPropagator.cs  | 85 +++++++++++++++++++
 .../Scripts/ScrollEventPropagator.cs.meta     | 11 +++
 4 files changed, 110 insertions(+)
 create mode 100644 Assets/FancyCarouselView/Runtime/Scripts/ScrollEventPropagator.cs
 create mode 100644 Assets/FancyCarouselView/Runtime/Scripts/ScrollEventPropagator.cs.meta

diff --git a/Assets/Demo/Scenes/CarouselDemo.unity b/Assets/Demo/Scenes/CarouselDemo.unity
index d6f06b0..33e6f2c 100644
--- a/Assets/Demo/Scenes/CarouselDemo.unity
+++ b/Assets/Demo/Scenes/CarouselDemo.unity
@@ -617,6 +617,7 @@ GameObject:
   - component: {fileID: 1539422976}
   - component: {fileID: 1539422974}
   - component: {fileID: 1539422973}
+  - component: {fileID: 1539422978}
   m_Layer: 5
   m_Name: Carousel View
   m_TagString: Untagged
@@ -733,6 +734,18 @@ CanvasRenderer:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 1539422972}
   m_CullTransparentMesh: 0
+--- !u!114 &1539422978
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 1539422972}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 85aedb7fe77344521bcb21f230abd15a, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
 --- !u!1 &1553209351
 GameObject:
   m_ObjectHideFlags: 0
diff --git a/Assets/FancyCarouselView/Runtime/Scripts/CarouselView.cs b/Assets/FancyCarouselView/Runtime/Scripts/CarouselView.cs
index 4b526ae..7ab3493 100644
--- a/Assets/FancyCarouselView/Runtime/Scripts/CarouselView.cs
+++ b/Assets/FancyCarouselView/Runtime/Scripts/CarouselView.cs
@@ -17,6 +17,7 @@ namespace FancyCarouselView.Runtime.Scripts
     /// <typeparam name="TCell"></typeparam>
     [RequireComponent(typeof(CarouselScroller))]
     [RequireComponent(typeof(Image))]
+    [RequireComponent(typeof(ScrollEventPropagator))]
     [DisallowMultipleComponent]
     public abstract class CarouselView<TData, TCell> : FancyScrollView<TData, CarouselContext<TData, TCell>>,
         ICarouselView<TData, TCell>, IBeginDragHandler, IDragHandler,
diff --git a/Assets/FancyCarouselView/Runtime/Scripts/ScrollEventPropagator.cs b/Assets/FancyCarouselView/Runtime/Scripts/ScrollEventPropagator.cs
new file mode 100644
index 0000000..ad133a3
--- /dev/null
+++ b/Assets/FancyCarouselView/Runtime/Scripts/ScrollEventPropagator.cs
@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using FancyScrollView;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.UI;
+
+namespace FancyCarouselView.Runtime.Scripts
+{
+    [RequireComponent(typeof(Scroller))]
+    public class ScrollEventPropagator : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
+    {
+        private IEnumerable<IBeginDragHandler> _beginDragHandlers;
+        private IEnumerable<IDragHandler> _dragHandlers;
+        private IEnumerable<IEndDragHandler> _endDragHandlers;
+        private bool _isEnabled;
+        private Scroller _scroller;
+
+        private void Start()
+        {
+            _scroller = GetComponent<Scroller>();
+            var parentScrollRect = GetComponentInParent<ScrollRect>();
+            if (parentScrollRect != null)
+            {
+                _beginDragHandlers = parentScrollRect.GetComponents<IBeginDragHandler>();
+                _dragHandlers = parentScrollRect.GetComponents<IDragHandler>();
+                _endDragHandlers = parentScrollRect.GetComponents<IEndDragHandler>();
+            }
+        }
+
+        void IBeginDragHandler.OnBeginDrag(PointerEventData eventData)
+        {
+            if (_scroller.ScrollDirection == ScrollDirection.Vertical
+                && Math.Abs(eventData.delta.x) > Math.Abs(eventData.delta.y))
+            {
+                _isEnabled = true;
+            }
+            else if (_scroller.ScrollDirection == ScrollDirection.Horizontal
+                     && Math.Abs(eventData.delta.x) < Math.Abs(eventData.delta.y))
+            {
+                _isEnabled = true;
+            }
+            else
+            {
+                _isEnabled = false;
+            }
+
+            if (!_isEnabled || _beginDragHandlers == null)
+            {
+                return;
+            }
+
+            foreach (var handler in _beginDragHandlers)
+            {
+                handler.OnBeginDrag(eventData);
+            }
+        }
+
+        void IDragHandler.OnDrag(PointerEventData eventData)
+        {
+            if (!_isEnabled || _dragHandlers == null)
+            {
+                return;
+            }
+
+            foreach (var handler in _dragHandlers)
+            {
+                handler.OnDrag(eventData);
+            }
+        }
+
+        void IEndDragHandler.OnEndDrag(PointerEventData eventData)
+        {
+            if (!_isEnabled || _endDragHandlers == null)
+            {
+                return;
+            }
+
+            foreach (var handler in _endDragHandlers)
+            {
+                handler.OnEndDrag(eventData);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/FancyCarouselView/Runtime/Scripts/ScrollEventPropagator.cs.meta b/Assets/FancyCarouselView/Runtime/Scripts/ScrollEventPropagator.cs.meta
new file mode 100644
index 0000000..47c4241
--- /dev/null
+++ b/Assets/FancyCarouselView/Runtime/Scripts/ScrollEventPropagator.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 85aedb7fe77344521bcb21f230abd15a
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: