There are a few different ways you could do this. One is through composition:

var React = require(react);

var _ = require(underscore);



var ScrollWrapper = React.createClass({

    propTypes: {

        onWindowScroll: React.PropTypes.func

    },



    handleScroll: function(event) {

        // Do something generic, if you have to

        console.log(ScrollWrapper's handleScroll);



        // Call the passed-in prop

        if (this.props.onWindowScroll) this.props.onWindowScroll(event);

    },



    render: function () {

        return this.props.children;

    },



    componentDidMount: function() {

        if (this.props.onWindowScroll) window.addEventListener(scroll, this.handleScroll);

    },



    componentWillUnmount: function() {

        if (this.props.onWindowScroll) window.removeEventListener(scroll, this.handleScroll);

    }

});



var ComponentA = React.createClass({

    handleScroll: function(event) {

        console.log(ComponentA's handleScroll);

    },



    render: function() {

        return (

            <ScrollWrapper onWindowScroll={this.handleScroll}>

                <div>whatever</div>

            </ScrollWrapper>

        );

    }

});

Now, you can place your generic logic in the ScrollWrapper component, and suddenly it becomes reusable. You could create a ComponentB that renders a ScrollWrapper just like ComponentA does.

To satisfy your example, maybe you'll have to pass the ScrollWrapper some extra props from ComponentA. Maybe you'll pass it a prop that contains an instance of the ref to call your logic on. You could even pass it some options or arguments to customize the tween or the bounds. I didn't code any of this because I think you'll understand it and be able to customize/write it for yourself with the base I've provided.

The other way to achieve this sort of thing is through a Mixin. Although, there's a lot of talk about if Mixins are good or bad, and they might even be being deprecated by React in the future? You can do some reading about this and decide for yourself what you think.