循环列表嵌套问题

[NiurouLee]

我们开发中遇到了一个纵向列表的元素中，嵌套了一个横向列表，因此我添加了如下修改

        public LoopScrollRect parentScorll;
        public virtual void OnBeginDrag(PointerEventData eventData)
        {
            if (this.IgnoreDragEvent || eventData.button != PointerEventData.InputButton.Left)
                return;

            if (!IsActive())
                return;
            if (parentScorll)
            {
                if (Mathf.Abs(eventData.delta.x) - Mathf.Abs(eventData.delta.y) > triggerParentValue)
                {
                    m_curDirection = Direction.Horizontal;
                }

                if (Mathf.Abs(eventData.delta.y) - Mathf.Abs(eventData.delta.x) > triggerParentValue)
                {
                    m_curDirection = Direction.Vertical;
                }

                if (m_curDirection != direction)
                {
                    //当前操作方向不等于滑动方向，将事件传给父对象
                    //当Parent是自己的时候会死循环StackOverflow
                    if (parentScorll.gameObject != this.gameObject)
                    {
                        ExecuteEvents.Execute(parentScorll.gameObject, eventData, ExecuteEvents.beginDragHandler);
                    }

                    return;
                }

                if (IgnoreMove)
                {
                    //当Parent是自己的时候会死循环StackOverflow
                    if (parentScorll.gameObject != this.gameObject)
                    {
                        ExecuteEvents.Execute(parentScorll.gameObject, eventData, ExecuteEvents.beginDragHandler);
                    }

                    return;
                }
            }
            //End
            StopMovement();
            UpdateBounds();

            m_PointerStartLocalCursor = Vector2.zero;
            RectTransformUtility.ScreenPointToLocalPointInRectangle(viewRect, eventData.position,
                eventData.pressEventCamera, out m_PointerStartLocalCursor);
            m_ContentStartPosition = m_Content.anchoredPosition;
            m_Dragging = true;
        }

        public virtual void OnEndDrag(PointerEventData eventData)
        {
            if (this.IgnoreDragEvent || eventData.button != PointerEventData.InputButton.Left)
                return;
            if (parentScorll)
            {
                if (parentScorll.m_Dragging)
                {
                    if (parentScorll.gameObject != this.gameObject)
                    {
                        ExecuteEvents.Execute(parentScorll.gameObject, eventData, ExecuteEvents.endDragHandler);
                        m_Dragging = false;
                        
                        return;
                    }
                }

                
                if (Mathf.Abs(eventData.delta.x) - Mathf.Abs(eventData.delta.y) > triggerParentValue)
                {
                    m_curDirection = Direction.Horizontal;
                }

                if (Mathf.Abs(eventData.delta.y) - Mathf.Abs(eventData.delta.x) > triggerParentValue)
                {
                    m_curDirection = Direction.Vertical;
                }

                if (m_curDirection != direction)
                {
                    //当前操作方向不等于滑动方向，将事件传给父对象
                    //当Parent是自己的时候会死循环StackOverflow
                    if (parentScorll.gameObject != this.gameObject&&parentScorll.m_Dragging)
                    {
                        ExecuteEvents.Execute(parentScorll.gameObject, eventData, ExecuteEvents.endDragHandler);
                        m_Dragging = false;

                        return;
                    }
                    

                }
                if (IgnoreMove)
                {
                    //当Parent是自己的时候会死循环StackOverflow
                    if (parentScorll.gameObject != this.gameObject)
                    {
                        ExecuteEvents.Execute(parentScorll.gameObject, eventData, ExecuteEvents.endDragHandler);
                    }

                    return;
                }
            }

            //End
            m_Dragging = false;

            if (vertical && verticalNormalizedPosition <= 0)
            {
                dataSource.OnEndTopDrag();
            }

            if (horizontal && horizontalNormalizedPosition <= 0)
            {
                dataSource.OnEndTopDrag();
            }

            OnEndDragEvent?.Invoke();
        }

[qiankanglai]

这个需求我也是做过的=。= 本质其实是嵌套scroll的时候，如何判定当前drag是谁来响应...

我琢磨下这个如何做成一个通用逻辑加进来，也许可以加一个口子暴露给外部逻辑来处理(这样控件本身就不关心了)

[qiankanglai]

我尝试了下几种写法，最后还是倾向于这种需求下就继承一个子类出来override OnBeginDrag/OnEndDrag接管了...
因为这种比较定制的逻辑如果直接加到LoopScrollRectBase的话，导致开关来控制有点困难emmm

我之前的写法比较接近Nested Scrollrect，其实是一个意思