Add scrollingResetTimeInterval to WindowScroller

docs/WindowScroller.md

@@ -14,6 +14,7 @@ This may change with a future release but for the time being this HOC is should
 | onResize | Function |  | Callback to be invoked on-resize; it is passed the following named parameters: `({ height: number, width: number })`. |
 | onScroll | Function |  | Callback to be invoked on-scroll; it is passed the following named parameters: `({ scrollTop: number, scrollLeft: number })`. |
 | scrollElement | any |  | Element to attach scroll event listeners. Defaults to `window`. |
+| scrollingResetTimeInterval | Number |  | Wait this amount of time after the last scroll event before resetting WindowScroller `pointer-events`; defaults to 150ms. |
 
 ### Public Methods
 

source/WindowScroller/WindowScroller.jest.js

@@ -223,6 +223,34 @@ describe('WindowScroller', () => {
 
       done()
     })
+
+    it('should support a custom :scrollingResetTimeInterval prop', async (done) => {
+      const component = render(getMarkup({
+        scrollingResetTimeInterval: 500
+      }))
+
+      const rendered = findDOMNode(component)
+
+      expect(rendered.textContent).toContain('isScrolling:false')
+
+      simulateWindowScroll({ scrollY: 5000 })
+
+      expect(rendered.textContent).toContain('isScrolling:true')
+
+      await new Promise(resolve => setTimeout(resolve, 100))
+
+      expect(rendered.textContent).toContain('isScrolling:true')
+
+      await new Promise(resolve => setTimeout(resolve, 100))
+
+      expect(rendered.textContent).toContain('isScrolling:true')
+
+      await new Promise(resolve => setTimeout(resolve, 300))
+
+      expect(rendered.textContent).toContain('isScrolling:false')
+
+      done()
+    })
   })
 
   describe('onResize', () => {

source/WindowScroller/utils/onScroll.js

@@ -30,9 +30,18 @@ function enablePointerEventsAfterDelay () {
     clearTimeout(disablePointerEventsTimeoutId)
   }
 
+  var maximumTimeout = IS_SCROLLING_TIMEOUT
+  mountedInstances.forEach(function (instance) {
+    if (instance.props.scrollingResetTimeInterval) {
+      if (instance.props.scrollingResetTimeInterval > maximumTimeout) {
+        maximumTimeout = instance.props.scrollingResetTimeInterval
+      }
+    }
+  })
+
   disablePointerEventsTimeoutId = setTimeout(
       enablePointerEventsAfterDelayCallback,
-      IS_SCROLLING_TIMEOUT
+      maximumTimeout
     )
 }