initial move of Sheet as subcomponent of Frame

src/components/Frame/Frame.tsx

@@ -2,6 +2,7 @@ import * as React from 'react';
 import {MobileCancelMajorMonotone} from '@shopify/polaris-icons';
 import {classNames} from '@shopify/react-utilities/styles';
 import {CSSTransition} from 'react-transition-group';
+import {noop} from 'babel-types';
 import {navigationBarCollapsed} from '../../utilities/breakpoints';
 import Button from '../Button';
 import Icon from '../Icon';
@@ -17,8 +18,9 @@ import {
   FrameContext,
   frameContextTypes,
   ToastProps,
+  SheetProps,
 } from './types';
-import {ToastManager, Loading, ContextualSaveBar} from './components';
+import {ToastManager, Loading, ContextualSaveBar, Sheet} from './components';
 
 import styles from './Frame.scss';
 
@@ -44,6 +46,7 @@ export interface State {
   loadingStack: number;
   toastMessages: (ToastProps & {id: string})[];
   showContextualSaveBar: boolean;
+  sheet: SheetProps;
 }
 
 export const GLOBAL_RIBBON_CUSTOM_PROPERTY = '--global-ribbon-height';
@@ -64,6 +67,7 @@ export class Frame extends React.PureComponent<CombinedProps, State> {
     toastMessages: [],
     mobileView: isMobileView(),
     showContextualSaveBar: false,
+    sheet: initializeSheet(),
   };
 
   private contextualSaveBar: ContextualSaveBarProps | null;
@@ -104,6 +108,7 @@ export class Frame extends React.PureComponent<CombinedProps, State> {
       toastMessages,
       showContextualSaveBar,
       mobileView,
+      sheet,
     } = this.state;
     const {
       children,
@@ -240,6 +245,8 @@ export class Frame extends React.PureComponent<CombinedProps, State> {
         />
       ) : null;
 
+    const sheetMarkup = <Sheet {...sheet} />;
+
     return (
       <div
         className={frameClassName}
@@ -263,11 +270,21 @@ export class Frame extends React.PureComponent<CombinedProps, State> {
         </main>
         <ToastManager toastMessages={toastMessages} />
         {globalRibbonMarkup}
+        {sheetMarkup}
         <EventListener event="resize" handler={this.handleResize} />
       </div>
     );
   }
 
+  // showSheet
+  // takes sheet props
+  // if current sheet is open, should hide sheet first
+  // calls setState on the sheet property with recieved sheet props
+
+  // hideSheet
+  // takes no props
+  // calls setState on the sheet property with initializeSheet()
+
   private setGlobalRibbonHeight = () => {
     const {globalRibbonContainer} = this;
     if (globalRibbonContainer) {
@@ -404,4 +421,12 @@ function isMobileView() {
   return navigationBarCollapsed().matches;
 }
 
+function initializeSheet(): SheetProps {
+  return {
+    open: false,
+    children: null,
+    onClose: noop,
+  };
+}
+
 export default withAppProvider<Props>()(Frame);

src/components/Frame/components/Sheet/Sheet.scss

@@ -0,0 +1,71 @@
+$sheet-desktop-width: rem(380px);
+
+.Sheet {
+  position: fixed;
+  bottom: 0;
+  width: 100vw;
+  height: 100%;
+  background: color('white');
+  box-shadow: shadow('layer');
+
+  &.desktop {
+    right: 0;
+    width: $sheet-desktop-width;
+  }
+
+  &:focus {
+    outline: 0;
+  }
+}
+
+.Container {
+  position: fixed;
+  z-index: z-index('modal', $fixed-element-stacking-order);
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+
+  &.desktop {
+    left: auto;
+    width: $sheet-desktop-width;
+  }
+}
+
+// Bottom
+.Bottom {
+  will-change: transform;
+  transition: transform duration('slow') easing('base');
+  transform-origin: bottom;
+}
+.enterBottom {
+  transform: translateY(100%);
+}
+.enterBottomActive {
+  transform: translateY(0%);
+}
+.exitBottom {
+  transform: translateY(0%);
+}
+.exitBottomActive {
+  transform: translateY(100%);
+}
+
+// Right
+.Right {
+  will-change: transform;
+  transition: transform duration('slow') easing('base');
+  transform-origin: right;
+}
+.enterRight {
+  transform: translateX(100%);
+}
+.enterRightActive {
+  transform: translateX(0%);
+}
+.exitRight {
+  transform: translateX(0%);
+}
+.exitRightActive {
+  transform: translateX(100%);
+}

src/components/Frame/components/Sheet/Sheet.tsx

@@ -0,0 +1,110 @@
+import * as React from 'react';
+
+import {CSSTransition} from 'react-transition-group';
+import debounce from 'lodash/debounce';
+import {classNames} from '@shopify/react-utilities/styles';
+
+import {navigationBarCollapsed} from '../../../../utilities/breakpoints';
+import {Key} from '../../../../types';
+import {layer, overlay, Duration} from '../../../shared';
+
+import TrapFocus from '../../../TrapFocus';
+import Portal from '../../../Portal';
+import KeypressListener from '../../../KeypressListener';
+import EventListener from '../../../EventListener';
+
+import {SheetProps as Props} from '../../types';
+
+import styles from './Sheet.scss';
+
+export const BOTTOM_CLASS_NAMES = {
+  enter: classNames(styles.Bottom, styles.enterBottom),
+  enterActive: classNames(styles.Bottom, styles.enterBottomActive),
+  exit: classNames(styles.Bottom, styles.exitBottom),
+  exitActive: classNames(styles.Bottom, styles.exitBottomActive),
+};
+
+export const RIGHT_CLASS_NAMES = {
+  enter: classNames(styles.Right, styles.enterRight),
+  enterActive: classNames(styles.Right, styles.enterRightActive),
+  exit: classNames(styles.Right, styles.exitRight),
+  exitActive: classNames(styles.Right, styles.exitRightActive),
+};
+
+export interface State {
+  mobile: boolean;
+}
+
+export default class Sheet extends React.PureComponent<Props, State> {
+  state: State = {
+    mobile: false,
+  };
+
+  private handleResize = debounce(
+    () => {
+      const {mobile} = this.state;
+      if (mobile !== isMobile()) {
+        this.setState({mobile: !mobile});
+      }
+    },
+    40,
+    {leading: true, trailing: true, maxWait: 40},
+  );
+
+  componentDidMount() {
+    const {mobile} = this.state;
+    if (mobile !== isMobile()) {
+      this.setState({mobile: !mobile});
+    }
+  }
+
+  render() {
+    const {children, open, onClose} = this.props;
+    const {mobile} = this.state;
+
+    const sheetClassName = classNames(styles.Sheet, !mobile && styles.desktop);
+
+    const containerClassName = classNames(
+      styles.Container,
+      !mobile && styles.desktop,
+    );
+
+    function Container() {
+      return (
+        <div className={containerClassName} {...layer.props} {...overlay.props}>
+          <TrapFocus trapping={open}>
+            <div role="dialog" tabIndex={-1} className={sheetClassName}>
+              {children}
+            </div>
+          </TrapFocus>
+        </div>
+      );
+    }
+
+    const sharedTransitionProps = {
+      timeout: Duration.Slow,
+      in: open,
+      mountOnEnter: true,
+      unmountOnExit: true,
+    };
+
+    const finalTransitionProps = {
+      classNames: mobile ? BOTTOM_CLASS_NAMES : RIGHT_CLASS_NAMES,
+      ...sharedTransitionProps,
+    };
+
+    return (
+      <Portal idPrefix="sheet">
+        <CSSTransition {...finalTransitionProps}>
+          <Container />
+        </CSSTransition>
+        <KeypressListener keyCode={Key.Escape} handler={onClose} />
+        <EventListener event="resize" handler={this.handleResize} />
+      </Portal>
+    );
+  }
+}
+
+export function isMobile(): boolean {
+  return navigationBarCollapsed().matches;
+}

src/components/Frame/components/Sheet/index.ts

@@ -0,0 +1,4 @@
+import Sheet from './Sheet';
+
+export {Props, isMobile} from './Sheet';
+export default Sheet;

src/components/Frame/components/Sheet/tests/Sheet.test.tsx

@@ -0,0 +1,70 @@
+import * as React from 'react';
+
+import {CSSTransition} from 'react-transition-group';
+import {noop} from '@shopify/javascript-utilities/other';
+import {matchMedia} from '@shopify/jest-dom-mocks';
+import {mountWithAppProvider} from 'test-utilities';
+
+import Sheet, {isMobile, BOTTOM_CLASS_NAMES, RIGHT_CLASS_NAMES} from '../Sheet';
+
+describe('<Sheet />', () => {
+  beforeEach(() => {
+    matchMedia.mock();
+  });
+
+  afterEach(() => {
+    matchMedia.restore();
+  });
+
+  const mockProps = {
+    open: true,
+    onClose: noop,
+  };
+
+  it('renders its children', () => {
+    const children = <div>Content</div>;
+
+    const sheet = mountWithAppProvider(
+      <Sheet {...mockProps}>{children}</Sheet>,
+    );
+
+    expect(sheet.find(children)).not.toBeNull();
+  });
+
+  it('renders a css transition component with bottom class names at mobile sizes', () => {
+    matchMedia.setMedia(() => ({matches: true}));
+
+    const sheet = mountWithAppProvider(
+      <Sheet {...mockProps}>
+        <div>Content</div>
+      </Sheet>,
+    );
+
+    expect(sheet.find(CSSTransition).props().classNames).toEqual(
+      BOTTOM_CLASS_NAMES,
+    );
+  });
+
+  it('renders a css transition component with right class names at desktop sizes', () => {
+    const sheet = mountWithAppProvider(
+      <Sheet {...mockProps}>
+        <div>Content</div>
+      </Sheet>,
+    );
+
+    expect(sheet.find(CSSTransition).props().classNames).toEqual(
+      RIGHT_CLASS_NAMES,
+    );
+  });
+
+  describe('isMobile', () => {
+    it('returns false by default', () => {
+      expect(isMobile()).toBe(false);
+    });
+
+    it('returns true at mobile sizes', () => {
+      matchMedia.setMedia(() => ({matches: true}));
+      expect(isMobile()).toBe(true);
+    });
+  });
+});

src/components/Frame/components/index.ts

@@ -9,3 +9,8 @@ export {
 } from './ToastManager';
 export {default as Loading, Props as LoadingProps} from './Loading';
 export {default as ContextualSaveBar} from './ContextualSaveBar';
+export {
+  default as Sheet,
+  Props as SheetProps,
+  isMobile as sheetIsMobile,
+} from './Sheet';

src/components/Frame/types.ts

@@ -67,3 +67,9 @@ export interface ToastProps {
   /** Adds an action next to the message (stand-alone app use only) */
   action?: Action;
 }
+
+export interface SheetProps {
+  open: boolean;
+  children: React.ReactNode;
+  onClose(): void;
+}