[DOP-3497]: Add arrow key functionality (#32)

src/components/VersionSelector/Option.tsx

@@ -3,9 +3,9 @@ import { StyledLi, StyledOptionText, StyledPlaceholder } from './styled.elements
 import Checkmark from './CheckmarkSvg';
 import { OptionProps } from './types';
 
-export const Option = ({ option, value, selected, onClick }: OptionProps) => {
-  const KEY_ENTER = 'ENTER';
-  const KEY_SPACE = 'SPACE';
+export const Option = ({ option, value, selected, onClick, focused }: OptionProps) => {
+  const KEY_ENTER = 'Enter';
+  const KEY_SPACE = ' ';
 
   const handleKeyPress = (event: React.KeyboardEvent) => {
     if (event.key === KEY_ENTER || event.key === KEY_SPACE) {
@@ -14,7 +14,12 @@ export const Option = ({ option, value, selected, onClick }: OptionProps) => {
   };
 
   return (
-    <StyledLi onClick={() => onClick(value)} onKeyPress={handleKeyPress} selected={selected}>
+    <StyledLi
+      onClick={() => onClick(value)}
+      onKeyPress={handleKeyPress}
+      selected={selected}
+      focused={focused}
+    >
       {selected ? <Checkmark /> : <StyledPlaceholder />}
       <StyledOptionText>{option}</StyledOptionText>
     </StyledLi>

src/components/VersionSelector/VersionSelector.tsx

@@ -21,16 +21,32 @@ import { useOutsideClick } from './use-outside-click';
 const VersionSelectorComponent = ({
   resourceVersions,
   active,
-  rootUrl,
   description,
+  rootUrl,
 }: VersionSelectorProps): JSX.Element => {
-  const [selectedIdx, setSelectedIdx] = React.useState(
-    resourceVersions.indexOf(active.resourceVersion),
-  );
+  const initialSelectedIdx = resourceVersions.indexOf(active.resourceVersion);
   const [open, setOpen] = React.useState<boolean>(false);
+  const [focusedIdx, setFocusedIdx] = React.useState<number>(-1);
+  const [selectedIdx, setSelectedIdx] = React.useState<number>(initialSelectedIdx);
+
   const menuListRef = React.useRef(null);
+
+  const options = resourceVersions.map((option, i) => {
+    return (
+      <Option
+        key={`option-${i}`}
+        selected={i === selectedIdx}
+        value={option}
+        option={`${option}${i === resourceVersions.length - 1 ? ' (latest)' : ''}`}
+        onClick={option => handleClick(i, option)}
+        focused={i === focusedIdx}
+      />
+    );
+  });
+
   useOutsideClick(menuListRef, () => {
     if (open) setOpen(false);
+    setFocusedIdx(0);
   });
 
   const handleClick = (idx: number, resourceVersion: string) => {
@@ -47,8 +63,43 @@ const VersionSelectorComponent = ({
     return setOpen(false);
   };
 
+  const handleFocusChange = (event: React.KeyboardEvent<HTMLDivElement>) => {
+    const { key, shiftKey } = event;
+
+    if (key === 'ArrowDown' || (key === 'Tab' && !shiftKey)) {
+      // if we go down when we are already past the end, don't do anything
+      if (focusedIdx === resourceVersions.length) return;
+
+      if (focusedIdx === -1) {
+        // when first entering the dropdown via the down arrow key or tab,
+        // we want to open the modal
+        setOpen(true);
+      } else if (focusedIdx === resourceVersions.length - 1) {
+        // if we are at the last element of the dropdown, and attempt to go
+        // down again, we want to close the dropdown
+        setOpen(false);
+      }
+      setFocusedIdx(focusedIdx + 1);
+    } else if (key === 'ArrowUp' || (key === 'Tab' && shiftKey)) {
+      // if we go down when we are already past the end, don't do anything
+      if (focusedIdx === -1) return;
+
+      if (focusedIdx === resourceVersions.length) {
+        // in this scenario, we are entering the dropdown from below
+        // we open the dropdown and start from the bottom
+        setOpen(true);
+      } else if (focusedIdx === 0) {
+        // if we reach the first element in the drop down, and we attempt to go up again,
+        // we want to close the dropdown
+        setOpen(false);
+      }
+
+      setFocusedIdx(focusedIdx - 1);
+    }
+  };
+
   return (
-    <StyledWrapper ref={menuListRef}>
+    <StyledWrapper onKeyDown={handleFocusChange} ref={menuListRef}>
       <StyledSelectWrapper>
         <StyledLabel>Resource Version:</StyledLabel>
         {description && <StyledDescription>{description}</StyledDescription>}
@@ -62,17 +113,7 @@ const VersionSelectorComponent = ({
 
       <StyledDropdown open={open}>
         <div>
-          <StyledMenuList>
-            {resourceVersions.map((option, i) => (
-              <Option
-                key={`option-${i}`}
-                selected={i === selectedIdx}
-                value={option}
-                option={`${option}${i === resourceVersions.length - 1 ? ' (latest)' : ''}`}
-                onClick={option => handleClick(i, option)}
-              />
-            ))}
-          </StyledMenuList>
+          <StyledMenuList>{options}</StyledMenuList>
         </div>
       </StyledDropdown>
     </StyledWrapper>

src/components/VersionSelector/styled.elements.ts

@@ -121,26 +121,17 @@ export const enabledOptionStyle = css`
   &:hover {
     background-color: ${palette.gray.light2};
   }
-
-  &:focus-visible {
-    color: ${palette.blue.dark2};
-    background-color: ${palette.blue.light3};
-
-    &:before {
-      opacity: 1;
-      transform: scaleY(1);
-      background-color: ${palette.blue.base};
-    }
-  }
 `;
 
-export const StyledLi = styled.li.attrs<{ selected: boolean; disabled?: boolean }>(
-  ({ selected }) => ({
-    role: 'option',
-    'aria-selected': selected,
-    tabIndex: '0',
-  }),
-)<{ selected: boolean; disabled?: boolean }>`
+export const StyledLi = styled.li.attrs<{
+  selected: boolean;
+  disabled?: boolean;
+  focused?: boolean;
+}>(({ selected }) => ({
+  role: 'option',
+  'aria-selected': selected,
+  tabIndex: '0',
+}))<{ selected: boolean; disabled?: boolean; focused?: boolean }>`
   display: flex;
   width: 100%;
   outline: none;
@@ -150,9 +141,11 @@ export const StyledLi = styled.li.attrs<{ selected: boolean; disabled?: boolean
   padding: 8px 12px;
   cursor: pointer;
   color: ${palette.gray.dark3};
-
+  ${props =>
+    props.focused &&
+    `color: ${palette.blue.dark2};
+    background-color: ${palette.blue.light3};`}
   font-weight: ${props => (props.selected ? `bold` : `normal`)};
-
   &:before {
     content: '';
     position: absolute;
@@ -165,8 +158,14 @@ export const StyledLi = styled.li.attrs<{ selected: boolean; disabled?: boolean
     border-radius: 0px 4px 4px 0px;
     opacity: 0;
     transition: all ${transitionDuration.default}ms ease-in-out;
+    ${props =>
+      props.focused &&
+      `
+      opacity: 1;
+      transform: scaleY(1);
+      background-color: ${palette.blue.base};
+      `}
   }
-
   ${props => (props.disabled ? disabledOptionStyle : enabledOptionStyle)}
 `;
 

src/components/VersionSelector/types.ts

@@ -10,6 +10,7 @@ export interface VersionSelectorProps {
 }
 
 export interface OptionProps {
+  focused: boolean;
   option: string;
   value: string;
   selected: boolean;

src/components/__tests__/__snapshots__/VersionSelector.test.tsx.snap

@@ -54,7 +54,7 @@ exports[`VersionSelector should correctly render VersionSelector 1`] = `
       >
         <li
           aria-selected="false"
-          class="sc-pNWdM glxGCd"
+          class="sc-pNWdM kSTcTW"
           role="option"
           tabindex="0"
         >
@@ -69,7 +69,7 @@ exports[`VersionSelector should correctly render VersionSelector 1`] = `
         </li>
         <li
           aria-selected="false"
-          class="sc-pNWdM glxGCd"
+          class="sc-pNWdM kSTcTW"
           role="option"
           tabindex="0"
         >
@@ -84,7 +84,7 @@ exports[`VersionSelector should correctly render VersionSelector 1`] = `
         </li>
         <li
           aria-selected="true"
-          class="sc-pNWdM jlRKTH"
+          class="sc-pNWdM derVNM"
           role="option"
           selected=""
           tabindex="0"