Контекст функции

Question

Подскажите как передать в функцию getMouse контекст нашего объекта, что бы оно видело console.log(this.ourdiv.style);

import React from "react";
class Main extends React.Component {
  constructor(props) {
    super(props);
    let deltaX;
    let deltaY;
    this.state = {
      divStyle: {
        width: "1000px",
        height: "500px",
        outline: "1px solid red",
        position: "relative"
      },
      move: {
        width: "200px",
        height: "100px",
        outline: "1px solid green",
        position: "absolute"
  }
}


}
getMouse(e) {
    console.log(this.ourdiv.style);
}
MouseDown(e) {
    var mousePosX = e.pageX;
    var mousePosY = e.pageY;
    console.log(this.ourdiv.style);
    var divPosX = this.ourdiv.offsetLeft;
    var divPosY = this.ourdiv.offsetTop;
    this.deltaX = mousePosX - divPosX;
    this.deltaY = mousePosY - divPosY;
    window.addEventListener("mousemove", this.getMouse);
    this.ourdiv.onmouseup = function() {
      window.removeEventListener("mousemove", this.getMouse);
    }
  }
render() {
return ( <
  div >
  <
  div style = {
    this.state.divStyle
  } >
  <
  div style = {
    this.state.move
  }
  ref = {
    (ourdiv) => this.ourdiv = ourdiv
  }
  onMouseDown = {
    this.MouseDown.bind(this)
  } > < /div> <
  /div> <
  /div>
)


}
}
export default Main;

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>