Add Drawer to DS

design-system/packages/modals/package.json

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+{
+  "name": "@keystone-ui/modals",
+  "version": "1.0.0",
+  "private": true,
+  "license": "MIT",
+  "main": "dist/modals.cjs.js",
+  "module": "dist/modals.esm.js",
+  "devDependencies": {
+    "@types/react": "^16.9.51"
+  },
+  "dependencies": {
+    "@babel/runtime": "^7.11.2",
+    "@keystone-ui/button": "*",
+    "@keystone-ui/core": "*",
+    "react": "^16.13.1",
+    "react-focus-lock": "^2.4.1",
+    "react-remove-scroll": "^2.4.0",
+    "react-transition-group": "^4.4.1"
+  },
+  "engines": {
+    "node": ">=10.0.0"
+  },
+  "repository": "https://github.com/keystonejs/keystone/tree/master/design-system/packages/modals"
+}

design-system/packages/modals/src/Blanket.tsx

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+/** @jsx jsx */
+
+import { HTMLAttributes, forwardRef } from 'react';
+import { jsx, keyframes, useTheme } from '@keystone-ui/core';
+
+const fadeInAnim = keyframes({
+  from: {
+    opacity: 0,
+  },
+});
+const easing = 'cubic-bezier(0.2, 0, 0, 1)';
+
+export const Blanket = forwardRef<HTMLDivElement, HTMLAttributes<HTMLDivElement>>((props, ref) => {
+  const theme = useTheme();
+
+  return (
+    <div
+      ref={ref}
+      css={{
+        animation: `${fadeInAnim} 320ms ${easing}`,
+        backgroundColor: 'rgba(0, 0, 0, 0.3)', // TODO get this from the theme
+        bottom: 0,
+        left: 0,
+        position: 'fixed',
+        right: 0,
+        top: 0,
+        zIndex: theme.elevation.e400,
+      }}
+      {...props}
+    />
+  );
+});

design-system/packages/modals/src/Drawer.tsx

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+/** @jsx jsx */
+
+import { MutableRefObject, ReactNode } from 'react';
+import { Button } from '@keystone-ui/button';
+import { jsx, makeId, useId, useTheme, Heading } from '@keystone-ui/core';
+
+import { DrawerBase } from './DrawerBase';
+import { useDrawerControllerContext } from './DrawerController';
+import { ActionsType } from './types';
+
+type DrawerProps = {
+  actions: ActionsType;
+  children: ReactNode;
+  id?: string;
+  initialFocusRef?: MutableRefObject<any>;
+  title: string;
+  width?: 'narrow' | 'wide';
+};
+
+export const Drawer = ({
+  actions,
+  children,
+  title,
+  id,
+  initialFocusRef,
+  width = 'narrow',
+}: DrawerProps) => {
+  const transitionState = useDrawerControllerContext();
+  const { cancel, confirm } = actions;
+  const { spacing } = useTheme();
+
+  const safeClose = actions.confirm.loading ? () => {} : actions.cancel.action;
+
+  const instanceId = useId(id);
+  const headingId = makeId(instanceId, 'heading');
+
+  return (
+    <DrawerBase
+      transitionState={transitionState}
+      aria-labelledby={headingId}
+      initialFocusRef={initialFocusRef}
+      onSubmit={actions.confirm.action}
+      onClose={safeClose}
+      width={width}
+    >
+      <div css={{ padding: `${spacing.large}px ${spacing.xlarge}px` }}>
+        <Heading id={headingId} type="h3">
+          {title}
+        </Heading>
+      </div>
+
+      <div css={{ overflowY: 'auto', padding: `0 ${spacing.xlarge}px` }}>{children}</div>
+
+      <div
+        css={{
+          display: 'flex',
+          flexShrink: 0,
+          flexDirection: 'column',
+          padding: `${spacing.large}px ${spacing.xlarge}px`,
+
+          '> button + button': {
+            marginTop: spacing.small,
+          },
+        }}
+      >
+        <Button tone="active" weight="bold" type="submit" isLoading={confirm.loading}>
+          {confirm.label}
+        </Button>
+        <Button onClick={safeClose} disabled={confirm.loading} weight="none" tone="passive">
+          {cancel.label}
+        </Button>
+      </div>
+    </DrawerBase>
+  );
+};

design-system/packages/modals/src/DrawerBase.tsx

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+/** @jsx jsx */
+
+import { Fragment, KeyboardEvent, MutableRefObject, ReactNode, useCallback, useRef } from 'react';
+import FocusLock from 'react-focus-lock';
+import { RemoveScroll } from 'react-remove-scroll';
+import { makeId, useId, useTheme, Portal, jsx } from '@keystone-ui/core';
+import { Blanket } from './Blanket';
+
+import { useDrawerManager } from './drawer-context';
+import { TransitionState } from './types';
+import { DrawerControllerContextProvider } from './DrawerController';
+
+const widths = {
+  narrow: 448,
+  wide: 720,
+};
+const easing = 'cubic-bezier(0.2, 0, 0, 1)';
+
+export type DrawerBaseProps = {
+  children: ReactNode;
+  initialFocusRef?: MutableRefObject<any>;
+  onClose: () => void;
+  transitionState: TransitionState;
+  onSubmit?: () => void;
+  width?: keyof typeof widths;
+};
+
+const blanketTransition = {
+  entering: { opacity: 0 },
+  entered: { opacity: 1 },
+  exiting: { opacity: 0 },
+  exited: { opacity: 0 },
+};
+
+export const DrawerBase = ({
+  children,
+  initialFocusRef,
+  onClose,
+  onSubmit,
+  width = 'narrow',
+  transitionState,
+  ...props
+}: DrawerBaseProps) => {
+  const theme = useTheme();
+  const containerRef = useRef(null);
+
+  const id = useId();
+  const uniqueKey = makeId('drawer', id);
+
+  // sync drawer state
+  let drawerDepth = useDrawerManager(uniqueKey);
+
+  const onKeyDown = (event: KeyboardEvent) => {
+    if (event.key === 'Escape' && !event.defaultPrevented) {
+      event.preventDefault();
+      onClose();
+    }
+  };
+
+  const activateFocusLock = useCallback(() => {
+    if (initialFocusRef && initialFocusRef.current) {
+      initialFocusRef.current.focus();
+    }
+  }, [initialFocusRef]);
+
+  const dialogTransition = getDialogTransition(drawerDepth);
+
+  let Tag: 'div' | 'form' = 'div';
+  if (onSubmit) {
+    Tag = 'form';
+    let oldOnSubmit = onSubmit;
+    // @ts-ignore
+    onSubmit = (event: any) => {
+      if (!event.defaultPrevented) {
+        event.preventDefault();
+        oldOnSubmit();
+      }
+    };
+  }
+
+  return (
+    <Portal>
+      <Fragment>
+        <Blanket
+          onClick={onClose}
+          style={{
+            transition: `opacity 150ms linear`,
+            ...blanketTransition[transitionState],
+            zIndex: theme.elevation.e400,
+          }}
+        />
+        <FocusLock autoFocus returnFocus onActivation={activateFocusLock}>
+          <RemoveScroll enabled>
+            <Tag
+              onSubmit={onSubmit}
+              aria-modal="true"
+              role="dialog"
+              ref={containerRef}
+              tabIndex={-1}
+              onKeyDown={onKeyDown}
+              style={dialogTransition[transitionState]}
+              css={{
+                backgroundColor: theme.colors.background,
+                borderRadius: theme.radii.large,
+                bottom: theme.spacing.small,
+                boxShadow: theme.shadow.s400,
+                position: 'fixed',
+                right: theme.spacing.small,
+                top: theme.spacing.small,
+                transition: `transform 150ms ${easing}`,
+                width: widths[width],
+                zIndex: theme.elevation.e400,
+
+                // flex layout must be applied here so content will grow/shrink properly
+                display: 'flex',
+                flexDirection: 'column',
+              }}
+              {...props}
+            >
+              <DrawerControllerContextProvider value={null}>
+                {children}
+              </DrawerControllerContextProvider>
+            </Tag>
+          </RemoveScroll>
+        </FocusLock>
+      </Fragment>
+    </Portal>
+  );
+};
+
+// Utils
+// ------------------------------
+
+function getDialogTransition(depth: number) {
+  let scaleInc = 0.05;
+  let transformValue = `scale(${1 - scaleInc * depth}) translateX(-${depth * 40}px)`;
+
+  return {
+    entering: { transform: 'translateX(100%)' },
+    entered: { transform: transformValue },
+    exiting: { transform: 'translateX(100%)' },
+    exited: { transform: 'translateX(100%)' },
+  };
+}

design-system/packages/modals/src/DrawerController.tsx

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+import React, { ReactNode, useContext } from 'react';
+import { Transition } from 'react-transition-group';
+
+import { TransitionState } from './types';
+
+type DrawerControllerProps = {
+  isOpen: boolean;
+  children: ReactNode;
+};
+
+const DrawerControllerContext = React.createContext<null | TransitionState>(null);
+
+export const DrawerControllerContextProvider = DrawerControllerContext.Provider;
+
+export const useDrawerControllerContext = () => {
+  let context = useContext(DrawerControllerContext);
+  if (!context) {
+    throw new Error(
+      'Drawers must be wrapped in a <DrawerController>. You should generally do this outside of the component that renders the <Drawer> or <TabbedDrawer>.'
+    );
+  }
+
+  return context;
+};
+
+export const DrawerController = ({ isOpen, children }: DrawerControllerProps) => {
+  return (
+    <Transition appear mountOnEnter unmountOnExit in={isOpen} timeout={150}>
+      {(transitionState: TransitionState) => (
+        <DrawerControllerContextProvider value={transitionState}>
+          {children}
+        </DrawerControllerContextProvider>
+      )}
+    </Transition>
+  );
+};

design-system/packages/modals/src/drawer-context.tsx

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+import React, { ReactNode, useCallback, useEffect, useState } from 'react';
+
+export type ModalState = {
+  drawerStack: string[];
+  pushToDrawerStack: (drawerKey: string) => void;
+  popFromDrawerStack: () => void;
+};
+
+const ModalContext = React.createContext<ModalState | null>(null);
+
+export const DrawerProvider = ({ children }: { children: ReactNode }) => {
+  let [drawerStack, setDrawerStack] = useState<string[]>([]);
+
+  const pushToDrawerStack = useCallback((key: string) => {
+    setDrawerStack(stack => [...stack, key]);
+  }, []);
+  const popFromDrawerStack = useCallback(() => {
+    setDrawerStack(stack => {
+      let less = stack.slice(0, -1);
+      return less;
+    });
+  }, []);
+
+  const context = {
+    drawerStack,
+    pushToDrawerStack,
+    popFromDrawerStack,
+  };
+
+  return <ModalContext.Provider value={context}>{children}</ModalContext.Provider>;
+};
+
+// Utils
+// ------------------------------
+export const useDrawerManager = (uniqueKey: string) => {
+  const modalState = React.useContext(ModalContext);
+
+  if (modalState === null) {
+    throw new Error(
+      'This component must have a <DrawerProvider/> ancestor in the same React tree.'
+    );
+  }
+
+  // keep the stack in sync on mount/unmount
+  useEffect(() => {
+    modalState.pushToDrawerStack(uniqueKey);
+    return () => {
+      modalState.popFromDrawerStack();
+    };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+  // the last key in the array is the "top" modal visually, so the depth is the inverse index
+  // be careful not to mutate the stack
+  let depth = modalState.drawerStack.slice().reverse().indexOf(uniqueKey);
+  // if it's not in the stack already,
+  // we know that it should be the last drawer in the stack but the effect hasn't happened yet
+  // so we need to make the depth 0 so the depth is correct even though the effect hasn't happened yet
+  return depth === -1 ? 0 : depth;
+};

design-system/packages/modals/src/index.tsx

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+export { Drawer } from './Drawer';
+export { DrawerProvider } from './drawer-context';
+export { DrawerController } from './DrawerController';

design-system/packages/modals/src/types.ts

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+type Action = {
+  action: () => void;
+  label: string;
+};
+
+export type ActionsType = {
+  cancel: Action;
+  confirm: Action & {
+    loading?: boolean;
+  };
+};
+
+export type TransitionState = 'entering' | 'entered' | 'exiting' | 'exited';