fix: Context menus can extend outside of window bounds

closes #2492

app/components/ContextMenu/index.js

@@ -5,6 +5,7 @@ import { Menu } from "reakit/Menu";
 import styled from "styled-components";
 import breakpoint from "styled-components-breakpoint";
 import usePrevious from "hooks/usePrevious";
+import useWindowSize from "hooks/useWindowSize";
 import {
   fadeIn,
   fadeAndSlideUp,
@@ -18,6 +19,9 @@ type Props = {|
   placement?: string,
   animating?: boolean,
   children: React.Node,
+  unstable_disclosureRef?: {
+    current: null | React.ElementRef<"button">,
+  },
   onOpen?: () => void,
   onClose?: () => void,
   hide?: () => void,
@@ -30,6 +34,9 @@ export default function ContextMenu({
   ...rest
 }: Props) {
   const previousVisible = usePrevious(rest.visible);
+  const [maxHeight, setMaxHeight] = React.useState(undefined);
+  const backgroundRef = React.useRef();
+  const { height: windowHeight } = useWindowSize();
 
   React.useEffect(() => {
     if (rest.visible && !previousVisible) {
@@ -44,6 +51,23 @@ export default function ContextMenu({
     }
   }, [onOpen, onClose, previousVisible, rest.visible]);
 
+  // sets the menu height based on the available space between the disclosure/
+  // trigger and the bottom of the window
+  React.useLayoutEffect(() => {
+    const padding = 8;
+
+    if (rest.visible) {
+      setMaxHeight(
+        rest.unstable_disclosureRef?.current
+          ? windowHeight -
+              rest.unstable_disclosureRef.current.getBoundingClientRect()
+                .bottom -
+              padding
+          : undefined
+      );
+    }
+  }, [rest.visible, rest.unstable_disclosureRef, windowHeight]);
+
   return (
     <>
       <Menu hideOnClickOutside preventBodyScroll {...rest}>
@@ -60,6 +84,8 @@ export default function ContextMenu({
                 dir="auto"
                 topAnchor={topAnchor}
                 rightAnchor={rightAnchor}
+                ref={backgroundRef}
+                style={maxHeight && topAnchor ? { maxHeight } : undefined}
               >
                 {rest.visible || rest.animating ? children : null}
               </Background>

app/hooks/useWindowSize.js

@@ -4,8 +4,8 @@ import * as React from "react";
 
 export default function useWindowSize() {
   const [windowSize, setWindowSize] = React.useState({
-    width: undefined,
-    height: undefined,
+    width: parseInt(window.innerWidth),
+    height: parseInt(window.innerHeight),
   });
 
   React.useEffect(() => {
@@ -13,8 +13,8 @@ export default function useWindowSize() {
     const handleResize = debounce(() => {
       // Set window width/height to state
       setWindowSize({
-        width: window.innerWidth,
-        height: window.innerHeight,
+        width: parseInt(window.innerWidth),
+        height: parseInt(window.innerHeight),
       });
     }, 100);