chore(combobox): fix positioning

.changeset/lucky-colts-grow.md

@@ -0,0 +1,6 @@
+---
+'@twilio-paste/combobox': patch
+'@twilio-paste/core': patch
+---
+
+[Combobox] Now opens the dropdown menu upwards when positioned towards the bottom of the viewport.

packages/paste-core/components/combobox/src/ListboxPositioner.tsx

@@ -0,0 +1,65 @@
+import * as React from 'react';
+import {Box, type BoxStyleProps} from '@twilio-paste/box';
+import {useRect} from '@radix-ui/react-use-rect';
+import {useWindowSize} from '@twilio-paste/utils';
+
+interface ListBoxPositionerProps {
+  children: React.ReactNode;
+  inputBoxRef: React.RefObject<HTMLElement>;
+  dropdownBoxRef: React.RefObject<HTMLElement>;
+}
+
+export const ListBoxPositioner: React.FC<ListBoxPositionerProps> = ({inputBoxRef, dropdownBoxRef, ...props}) => {
+  const {height: windowHeight} = useWindowSize();
+  const inputBoxDimensions = useRect(inputBoxRef.current);
+  const dropdownBoxDimensions = useRect(dropdownBoxRef.current);
+  const dropdownBoxHeight = dropdownBoxDimensions?.height;
+
+  const styles = React.useMemo((): BoxStyleProps => {
+    if (dropdownBoxHeight == null || inputBoxDimensions == null || dropdownBoxHeight === 0) {
+      return {};
+    }
+
+    /*
+     *  Scenarios:
+     * 1- Dropdown height is bigger than window height
+     *   - Then show at the top of the viewport
+     * 2- Dropdown height + inputbox bottom is bigger than viewport height
+     *   - Show upwards
+     * 3- Dropdown height + inputbox bottom is smaller than viewport height
+     *   - Show downwards
+     */
+    if (windowHeight) {
+      if (dropdownBoxHeight >= windowHeight) {
+        return {
+          position: 'fixed',
+          top: 0,
+          left: inputBoxDimensions?.left,
+          right: inputBoxDimensions?.right,
+          width: inputBoxDimensions?.width,
+        };
+      }
+      if (dropdownBoxHeight + inputBoxDimensions?.bottom >= windowHeight) {
+        return {
+          position: 'fixed',
+          // 6px to account for border things, should be fine on all themes
+          top: inputBoxDimensions?.top - dropdownBoxHeight - 6,
+          left: inputBoxDimensions?.left,
+          right: inputBoxDimensions?.right,
+          width: inputBoxDimensions?.width,
+        };
+      }
+    }
+
+    return {
+      position: 'fixed',
+      top: inputBoxDimensions?.bottom,
+      left: inputBoxDimensions?.left,
+      right: inputBoxDimensions?.right,
+      width: inputBoxDimensions?.width,
+    };
+  }, [inputBoxDimensions, dropdownBoxHeight, windowHeight]);
+
+  return <Box {...props} {...styles} zIndex="zIndex90" />;
+};
+ListBoxPositioner.displayName = 'ListBoxPositioner';

packages/paste-core/components/combobox/src/multiselect/MultiselectCombobox.tsx

@@ -12,8 +12,8 @@ import {FormPillGroup, FormPill, useFormPillState} from '@twilio-paste/form-pill
 import {useComboboxPrimitive, useMultiSelectPrimitive} from '@twilio-paste/combobox-primitive';
 import {InputBox, InputChevronWrapper, getInputChevronIconColor} from '@twilio-paste/input-box';
 import {Portal} from '@twilio-paste/reakit-library';
-import {useRect} from '@radix-ui/react-use-rect';
 
+import {ListBoxPositioner} from '../ListboxPositioner';
 import {GrowingInput} from './GrowingInput';
 import {ComboboxListbox} from '../styles/ComboboxListbox';
 import {ComboboxItems} from '../ComboboxItems';
@@ -61,7 +61,6 @@ export const MultiselectCombobox = React.forwardRef<HTMLInputElement, Multiselec
 
     // gets the dimensions of the inputBox to position the listbox
     const inputBoxRef = React.useRef<HTMLDivElement>(null);
-    const inputBoxDimensions = useRect(inputBoxRef.current);
 
     const onSelectedItemsChange = React.useCallback(
       (changes: any) => {
@@ -363,14 +362,7 @@ export const MultiselectCombobox = React.forwardRef<HTMLInputElement, Multiselec
           </Box>
         </InputBox>
         <Portal>
-          <Box
-            position="fixed"
-            top={inputBoxDimensions?.bottom}
-            left={inputBoxDimensions?.left}
-            right={inputBoxDimensions?.right}
-            width={inputBoxDimensions?.width}
-            zIndex="zIndex90"
-          >
+          <ListBoxPositioner inputBoxRef={inputBoxRef} dropdownBoxRef={parentRef}>
             <ComboboxListbox
               {...getMenuProps({ref: parentRef})}
               element={`${element}_LISTBOX`}
@@ -393,7 +385,7 @@ export const MultiselectCombobox = React.forwardRef<HTMLInputElement, Multiselec
                 emptyState={emptyState}
               />
             </ComboboxListbox>
-          </Box>
+          </ListBoxPositioner>
         </Portal>
         {helpText && (
           <HelpText id={helpTextId} variant={getHelpTextVariant(variant, hasError)} element={`${element}_HELP_TEXT`}>

packages/paste-core/components/combobox/src/singleselect/Combobox.tsx

@@ -11,14 +11,14 @@ import {HelpText} from '@twilio-paste/help-text';
 import type {HelpTextVariants} from '@twilio-paste/help-text';
 import type {InputVariants} from '@twilio-paste/input';
 import {Portal} from '@twilio-paste/reakit-library';
-import {useRect} from '@radix-ui/react-use-rect';
 
 import {ComboboxInputSelect} from '../styles/ComboboxInputSelect';
 import {ComboboxInputWrapper} from '../styles/ComboboxInputWrapper';
 import {ComboboxListbox} from '../styles/ComboboxListbox';
 import {ComboboxItems} from '../ComboboxItems';
 import type {ComboboxProps} from '../types';
 import {extractPropsFromState} from './extractPropsFromState';
+import {ListBoxPositioner} from '../ListboxPositioner';
 
 const getHelpTextVariant = (variant: InputVariants, hasError: boolean | undefined): HelpTextVariants => {
   if (hasError && variant === 'inverse') {
@@ -75,7 +75,6 @@ const Combobox = React.forwardRef<HTMLInputElement, ComboboxProps>(
 
     // gets the dimensions of the inputBox to position the listbox
     const inputBoxRef = React.useRef<HTMLDivElement>(null);
-    const inputBoxDimensions = useRect(inputBoxRef.current);
 
     const {
       getComboboxProps,
@@ -183,15 +182,7 @@ const Combobox = React.forwardRef<HTMLInputElement, ComboboxProps>(
           </ComboboxInputWrapper>
         </InputBox>
         <Portal>
-          <Box
-            position="fixed"
-            top={inputBoxDimensions?.bottom}
-            left={inputBoxDimensions?.left}
-            right={inputBoxDimensions?.right}
-            width={inputBoxDimensions?.width}
-            zIndex="zIndex90"
-            display={isOpen ? 'block' : 'none'}
-          >
+          <ListBoxPositioner inputBoxRef={inputBoxRef} dropdownBoxRef={parentRef}>
             <ComboboxListbox hidden={!isOpen} element={`${element}_LISTBOX`} {...getMenuProps({ref: parentRef})}>
               <ComboboxItems
                 ref={scrollToIndexRef}
@@ -208,7 +199,7 @@ const Combobox = React.forwardRef<HTMLInputElement, ComboboxProps>(
                 emptyState={emptyState}
               />
             </ComboboxListbox>
-          </Box>
+          </ListBoxPositioner>
         </Portal>
         {helpText && (
           <HelpText id={helpTextId} variant={getHelpTextVariant(variant, hasError)}>

packages/paste-core/components/combobox/stories/Combobox.stories.tsx

@@ -150,6 +150,40 @@ export const DefaultCombobox: StoryFn = () => {
 
 DefaultCombobox.storyName = 'Combobox';
 
+export const BottomOfScreen: StoryFn = () => {
+  return (
+    <>
+      <Box height="size50" width="100%" />
+      <Combobox
+        items={iconItems}
+        labelText="Choose a component:"
+        helpText="This is the help text"
+        optionTemplate={(item: IconItems) => (
+          <MediaObject verticalAlign="center">
+            {item.iconLeft ? (
+              <MediaFigure spacing="space20">
+                <InformationIcon decorative={false} size="sizeIcon20" title="information" />
+              </MediaFigure>
+            ) : null}
+
+            <MediaBody>{item.label}</MediaBody>
+            {item.iconRight ? (
+              <MediaFigure spacing="space20">
+                <InformationIcon decorative={false} size="sizeIcon20" title="information" />
+              </MediaFigure>
+            ) : null}
+          </MediaObject>
+        )}
+        itemToString={(item: IconItems) => (item ? String(item.label) : '')}
+      />
+    </>
+  );
+};
+BottomOfScreen.storyName = 'Bottom of screen';
+BottomOfScreen.parameters = {
+  chromatic: {disableSnapshot: true},
+};
+
 const ItemToString = ({name}: {name: string}): string => name;
 
 export const VirtualizedCombobox: StoryFn = () => {

packages/paste-core/components/combobox/stories/MultiselectCombobox.stories.tsx

@@ -66,6 +66,34 @@ export const MultiselectComboboxBasic = (): React.ReactNode => {
 };
 MultiselectComboboxBasic.storyName = 'Basic';
 
+export const BottomOfScreen = (): React.ReactNode => {
+  const [inputValue, setInputValue] = React.useState('');
+  const filteredItems = React.useMemo(() => getFilteredItems(inputValue), [inputValue]);
+
+  return (
+    <>
+      <Box height="size50" width="100%" />
+      <MultiselectCombobox
+        labelText="Choose a Paste Component"
+        selectedItemsLabelText="Selected Paste components"
+        helpText="Paste components are the building blocks of your product UI."
+        items={filteredItems}
+        onInputValueChange={({inputValue: newInputValue = ''}) => {
+          setInputValue(newInputValue);
+        }}
+        onSelectedItemsChange={(selectedItems: string[]) => {
+          // eslint-disable-next-line no-console
+          console.log(selectedItems);
+        }}
+      />
+    </>
+  );
+};
+BottomOfScreen.storyName = 'Bottom of screen';
+BottomOfScreen.parameters = {
+  chromatic: {disableSnapshot: true},
+};
+
 /*
  * Basic - Inverse
  */

packages/paste-core/components/sidebar/stories/full-composition/components/Console.tsx

@@ -58,6 +58,7 @@ export const Console: React.FC<React.PropsWithChildren<{collapsed: boolean; setC
     <Box minWidth="1200px">
       {/* Can be placed anywhere - position fixed */}
       <Sidebar
+        aria-label={id}
         collapsed={collapsed}
         variant="compact"
         sidebarNavigationSkipLinkID={sidebarNavigationSkipLinkID}

packages/paste-core/components/sidebar/stories/full-composition/components/Flex.tsx

@@ -47,6 +47,7 @@ export const Flex: React.FC<React.PropsWithChildren<{collapsed: boolean; setColl
   return (
     <Box minWidth="1200px">
       <Sidebar
+        aria-label={id}
         sidebarNavigationSkipLinkID={sidebarNavigationSkipLinkID}
         topbarSkipLinkID={topbarSkipLinkID}
         mainContentSkipLinkID={mainContentSkipLinkID}

packages/paste-core/components/sidebar/stories/full-composition/components/Segment.tsx

@@ -57,6 +57,7 @@ export const Segment: React.FC<React.PropsWithChildren<{collapsed: boolean; setC
     <Box minWidth="1200px">
       {/* Can be placed anywhere - position fixed */}
       <Sidebar
+        aria-label={id}
         sidebarNavigationSkipLinkID={sidebarNavigationSkipLinkID}
         topbarSkipLinkID={topbarSkipLinkID}
         mainContentSkipLinkID={mainContentSkipLinkID}

packages/paste-core/components/sidebar/stories/full-composition/docs.stories.tsx

@@ -49,6 +49,7 @@ export const Docs: StoryFn = () => {
     <Box minWidth="1200px">
       {/* Can be placed anywhere - position fixed */}
       <Sidebar
+        aria-label={id}
         sidebarNavigationSkipLinkID={sidebarNavigationSkipLinkID}
         topbarSkipLinkID={topbarSkipLinkID}
         mainContentSkipLinkID={mainContentSkipLinkID}
@@ -107,8 +108,8 @@ export const Docs: StoryFn = () => {
       {/* Must wrap content area */}
       <SidebarPushContentWrapper collapsed={pushSidebarCollapsed} variant="compact">
         <Topbar id={topbarSkipLinkID}>
-          <TopbarActions justify="start">
-            <InPageNavigation aria-label="Product" marginBottom="space0">
+          <TopbarActions justify="start" aria-label={topbarSkipLinkID}>
+            <InPageNavigation aria-label={`Product ${topbarSkipLinkID}`} marginBottom="space0">
               <InPageNavigationItem href="#" currentPage>
                 Messaging
               </InPageNavigationItem>