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+### FileDrop
+
+Renders a file drag and drop component for a single file.
+
+Create a ref called `dropRef` for this component.
+Initialize `state.drag` and `state.filename` to `false` and `''` respectively.
+The variables `dragCounter` and `state.drag` are used to determine if a file is being dragged, while `state.filename` is used to store the dropped file's name.
+Create the `handleDrag`, `handleDragIn`, `handleDragOut` and `handleDrop` methods to handle drag and drop functionality,  bind them to the component's context.
+Each of the methods will handle a specific event, the listeners for which are created and removed in `componentDidMount` and `componentWillUnmount` respectively.
+`handleDrag` prevents the browser from opening the dragged file, `handleDragIn` and `handleDragOut` handle the dragged file entering and exiting the component, while `handleDrop` handles the file being dropped and passes it to `this.props.handleDrop`.
+In the `render()` method, create an appropriately styled `<div>` and use `state.drag` and `state.filename` to determine its contents and style. 
+Finally, bind the `ref` of the created `<div>` to `dropRef`.
+
+
+```css
+.filedrop {
+  min-height: 120px;
+  border: 3px solid #D3D3D3;
+  text-align: center;
+  font-size: 24px;
+  padding: 32px;
+  border-radius: 4px;
+}
+
+.filedrop.drag {
+  border: 3px dashed #1E90FF;
+}
+
+.filedrop.ready {
+  border: 3px solid #32CD32;
+}
+```
+
+```jsx
+class FileDrop extends React.Component {
+  constructor(props) {
+    super(props);
+    this.dropRef = React.createRef();
+    this.state = {
+      drag: false,
+      filename: ''
+    }
+    this.handleDrag = this.handleDrag.bind(this);
+    this.handleDragIn = this.handleDragIn.bind(this);
+    this.handleDragOut = this.handleDragOut.bind(this);
+    this.handleDrop = this.handleDrop.bind(this);
+  }
+
+  handleDrag(e) {
+    e.preventDefault();
+    e.stopPropagation();
+  }
+
+  handleDragIn(e) {
+    e.preventDefault();
+    e.stopPropagation();
+    this.dragCounter++;
+    if (e.dataTransfer.items && e.dataTransfer.items.length > 0) 
+      this.setState({ drag: true });
+  }
+
+  handleDragOut(e) {
+    e.preventDefault();
+    e.stopPropagation();
+    this.dragCounter--;
+    if (this.dragCounter === 0) 
+      this.setState({ drag: false });
+  }
+
+  handleDrop(e) {
+    e.preventDefault();
+    e.stopPropagation();
+    this.setState({ drag: false });
+    if (e.dataTransfer.files && e.dataTransfer.files.length > 0) {
+      this.props.handleDrop(e.dataTransfer.files[0]);
+      this.setState({ filename : e.dataTransfer.files[0].name});
+      e.dataTransfer.clearData();
+      this.dragCounter = 0;
+    }
+  }
+
+  componentDidMount() {
+    let div = this.dropRef.current;
+    div.addEventListener('dragenter', this.handleDragIn);
+    div.addEventListener('dragleave', this.handleDragOut);
+    div.addEventListener('dragover', this.handleDrag);
+    div.addEventListener('drop', this.handleDrop);
+  }
+
+  componentWillUnmount() {
+    let div = this.dropRef.current;
+    div.removeEventListener('dragenter', this.handleDragIn);
+    div.removeEventListener('dragleave', this.handleDragOut);
+    div.removeEventListener('dragover', this.handleDrag);
+    div.removeEventListener('drop', this.handleDrop);
+  }
+
+  render() {
+    return (
+      <div ref={this.dropRef} className={this.state.drag ? 'filedrop drag' : this.state.filename ? 'filedrop ready' : 'filedrop'}>
+        {this.state.filename && !this.state.drag ? 
+          <div>{this.state.filename}</div>
+          : <div>Drop files here!</div>
+        }
+      </div>
+    )
+  }
+}
+```
+
+```jsx
+ReactDOM.render(<FileDrop handleDrop={console.log}/>, document.getElementById('root'));
+```
+
+<!-- tags: visual,input,state,class -->
+
+<!-- expertise: 2 -->