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Creating a 'onChangeScrollState' callback function prop… #227
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…(if exists) in componentDidUpdate when pastState.isScrolling !== this.state.isScrolling. Also, allowing function props/handlers to be null or undefined to prevent function call/binding when not needed.
…s to be a more accurate timing as perhaps no need to wait for React to perform update.
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…to be called (if exists) in componentDidUpdate when pastState.isScrolling !== this.state.isScrolling. Maybe it should go into componentWillUpdate?
This function prop allows me to set "pointer-events: none" on a parent element while scrolling. In my case, list items (
displayables) are within a horizontally scrollable container which causes Chrome to lag/skip slightly during scrolling. Settingpointer-events: noneon the element withoverflow-x: auto, during vertical scrolling, fixes this.Another edit included in this PR is changing a couple of defaultProps for function props/properties from
function(){}to either null or undefined, so function doesn't get bound to an element at all if not provided/used. Point was to slightly improve performance, if possible.In near future, would like to convert to ES6 module syntax (
class Infinite extends React.Component { ...) if no one else has started on this.