Rename JSX files with proper .jsx extension (#23733)

app/javascript/mastodon/components/column.jsx

@@ -0,0 +1,62 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { supportsPassiveEvents } from 'detect-passive-events';
+import { scrollTop } from '../scroll';
+
+export default class Column extends React.PureComponent {
+
+  static propTypes = {
+    children: PropTypes.node,
+    label: PropTypes.string,
+    bindToDocument: PropTypes.bool,
+  };
+
+  scrollTop () {
+    const scrollable = this.props.bindToDocument ? document.scrollingElement : this.node.querySelector('.scrollable');
+
+    if (!scrollable) {
+      return;
+    }
+
+    this._interruptScrollAnimation = scrollTop(scrollable);
+  }
+
+  handleWheel = () => {
+    if (typeof this._interruptScrollAnimation !== 'function') {
+      return;
+    }
+
+    this._interruptScrollAnimation();
+  };
+
+  setRef = c => {
+    this.node = c;
+  };
+
+  componentDidMount () {
+    if (this.props.bindToDocument) {
+      document.addEventListener('wheel', this.handleWheel, supportsPassiveEvents ? { passive: true } : false);
+    } else {
+      this.node.addEventListener('wheel', this.handleWheel, supportsPassiveEvents ? { passive: true } : false);
+    }
+  }
+
+  componentWillUnmount () {
+    if (this.props.bindToDocument) {
+      document.removeEventListener('wheel', this.handleWheel);
+    } else {
+      this.node.removeEventListener('wheel', this.handleWheel);
+    }
+  }
+
+  render () {
+    const { label, children } = this.props;
+
+    return (
+      <div role='region' aria-label={label} className='column' ref={this.setRef}>
+        {children}
+      </div>
+    );
+  }
+
+}