nl-design-system · Robbert · Oct 16, 2023 · Oct 12, 2023
diff --git a/components/flex-wrap-fallback/README.md b/components/flex-wrap-fallback/README.md
@@ -0,0 +1,9 @@
+<!-- @license CC0-1.0 -->
+
+# Flex wrap fallback
+
+The _flex wrap fallback_ component will choose between the default slot, and a fallback slot, based on flexbox wrapping. When the default content wraps over multiple lines, it will display the fallback content instead.
+
+For example: you can choose between a menu bar navigation for wide screens, and a hamburger menu for narrow screens.
+
+**Warning:** this component is experimental.
diff --git a/components/flex-wrap-fallback/tokens.json b/components/flex-wrap-fallback/tokens.json
@@ -0,0 +1,5 @@
+{
+  "utrecht": {
+    "flex-wrap-fallback": {}
+  }
+}
diff --git a/packages/storybook-web-component/src/FlexWrapFallback.stories.tsx b/packages/storybook-web-component/src/FlexWrapFallback.stories.tsx
@@ -0,0 +1,155 @@
+/* @license CC0-1.0 */
+
+import type { Meta, StoryObj } from '@storybook/react';
+import readme from '@utrecht/components/flex-wrap-fallback/README.md?raw';
+import tokensDefinition from '@utrecht/components/flex-wrap-fallback/tokens.json';
+import tokens from '@utrecht/design-tokens/dist/index.json';
+import {
+  UtrechtButton,
+  UtrechtButtonGroup,
+  UtrechtDrawer,
+  UtrechtFlexWrapFallback,
+  UtrechtLink,
+} from '@utrecht/web-component-library-react';
+import React, { PropsWithChildren, ReactNode } from 'react';
+import { designTokenStory } from './design-token-story';
+
+interface FlexWrapFallbackStoryProps {
+  fallback?: ReactNode;
+}
+
+const FlexWrapFallbackStory = ({ children, fallback, ...restProps }: PropsWithChildren<FlexWrapFallbackStoryProps>) => (
+  <UtrechtFlexWrapFallback {...restProps}>
+    {children}
+    {fallback}
+  </UtrechtFlexWrapFallback>
+);
+
+const meta = {
+  title: 'Web Component/Flex-wrap fallback',
+  id: 'web-component-flex-wrap-fallback',
+  component: FlexWrapFallbackStory,
+  argTypes: {
+    children: {
+      description: 'Content',
+    },
+    fallback: {
+      description: 'Fallback content',
+    },
+  },
+  args: {
+    children: [],
+  },
+  tags: ['autodocs'],
+  parameters: {
+    status: {
+      type: 'WORK IN PROGRESS',
+    },
+    tokensPrefix: 'utrecht-flex-wrap-fallback',
+    tokens,
+    tokensDefinition,
+    docs: {
+      description: {
+        component: readme,
+      },
+    },
+  },
+} satisfies Meta<typeof FlexWrapFallbackStory>;
+
+export default meta;
+
+type Story = StoryObj<typeof meta>;
+
+export const Default: Story = {
+  args: {
+    children: [
+      <div
+        style={{
+          display: 'flex',
+          flexWrap: 'wrap',
+          minHeight: '100px',
+          justifyContent: 'space-between',
+          inlineSize: '100%',
+        }}
+      >
+        <div>
+          <a href="https://example.com/">Home</a>
+        </div>
+        <div>
+          <a href="https://example.com/2">Link 2</a>
+        </div>
+        <div>
+          <a href="https://example.com/3">Link 3</a>
+        </div>
+        <div>
+          <a href="https://example.com/4">Link 4</a>
+        </div>
+        <div>
+          <a href="https://example.com/5">Link 5</a>
+        </div>
+        <div>
+          <a href="https://example.com/6">Link 6</a>
+        </div>
+        <div>
+          <a href="https://example.com/7">Link 7</a>
+        </div>
+        <div>
+          <a href="https://example.com/8">Link 8</a>
+        </div>
+        <div>
+          <a href="https://example.com/9">Link 9</a>
+        </div>
+      </div>,
+    ],
+    fallback: [
+      <UtrechtButtonGroup slot="fallback">
+        <UtrechtButton appearance="subtle" expanded="false">
+          Open menu
+        </UtrechtButton>
+      </UtrechtButtonGroup>,
+      <UtrechtDrawer open slot="fallback">
+        <ul>
+          <li>
+            <UtrechtLink href="https://example.com/">Home</UtrechtLink>
+          </li>
+          <li>
+            <UtrechtLink href="https://example.com/2">Link 2</UtrechtLink>
+          </li>
+          <li>
+            <UtrechtLink href="https://example.com/3">Link 3</UtrechtLink>
+          </li>
+          <li>
+            <UtrechtLink href="https://example.com/4">Link 4</UtrechtLink>
+          </li>
+          <li>
+            <UtrechtLink href="https://example.com/5">Link 5</UtrechtLink>
+          </li>
+          <li>
+            <UtrechtLink href="https://example.com/6">Link 6</UtrechtLink>
+          </li>
+          <li>
+            <UtrechtLink href="https://example.com/7">Link 7</UtrechtLink>
+          </li>
+          <li>
+            <UtrechtLink href="https://example.com/8">Link 8</UtrechtLink>
+          </li>
+          <li>
+            <UtrechtLink href="https://example.com/9">Link 9</UtrechtLink>
+          </li>
+        </ul>
+      </UtrechtDrawer>,
+    ],
+  },
+  decorators: [(Story) => <div style={{ inlineSize: '1280px', minBlockSize: '240px' }}>{Story()}</div>],
+  name: 'No flex-wrap (1280px wide)',
+};
+
+export const SmallInlineSize: Story = {
+  args: {
+    ...Default.args,
+  },
+  decorators: [(Story) => <div style={{ maxInlineSize: '320px', minBlockSize: '240px' }}>{Story()}</div>],
+  name: 'Flex-wrap fallback (320px wide)',
+};
+
+export const DesignTokens = designTokenStory(meta);
diff --git a/packages/web-component-library-stencil/src/components.d.ts b/packages/web-component-library-stencil/src/components.d.ts
@@ -720,6 +720,8 @@ export namespace Components {
     }
     interface UtrechtUrlData {
     }
+    interface UtrechtWrapAlternative {
+    }
 }
 export interface UtrechtButtonCustomEvent<T> extends CustomEvent<T> {
     detail: T;
@@ -2486,6 +2488,12 @@ declare global {
         prototype: HTMLUtrechtUrlDataElement;
         new (): HTMLUtrechtUrlDataElement;
     };
+    interface HTMLUtrechtWrapAlternativeElement extends Components.UtrechtWrapAlternative, HTMLStencilElement {
+    }
+    var HTMLUtrechtWrapAlternativeElement: {
+        prototype: HTMLUtrechtWrapAlternativeElement;
+        new (): HTMLUtrechtWrapAlternativeElement;
+    };
     interface HTMLElementTagNameMap {
         "utrecht-alert": HTMLUtrechtAlertElement;
         "utrecht-article": HTMLUtrechtArticleElement;
@@ -2773,6 +2781,7 @@ declare global {
         "utrecht-textarea": HTMLUtrechtTextareaElement;
         "utrecht-textbox": HTMLUtrechtTextboxElement;
         "utrecht-url-data": HTMLUtrechtUrlDataElement;
+        "utrecht-wrap-alternative": HTMLUtrechtWrapAlternativeElement;
     }
 }
 declare namespace LocalJSX {
@@ -3518,6 +3527,8 @@ declare namespace LocalJSX {
     }
     interface UtrechtUrlData {
     }
+    interface UtrechtWrapAlternative {
+    }
     interface IntrinsicElements {
         "utrecht-alert": UtrechtAlert;
         "utrecht-article": UtrechtArticle;
@@ -3805,6 +3816,7 @@ declare namespace LocalJSX {
         "utrecht-textarea": UtrechtTextarea;
         "utrecht-textbox": UtrechtTextbox;
         "utrecht-url-data": UtrechtUrlData;
+        "utrecht-wrap-alternative": UtrechtWrapAlternative;
     }
 }
 export { LocalJSX as JSX };
@@ -4113,6 +4125,7 @@ declare module "@stencil/core" {
             "utrecht-textarea": LocalJSX.UtrechtTextarea & JSXBase.HTMLAttributes<HTMLUtrechtTextareaElement>;
             "utrecht-textbox": LocalJSX.UtrechtTextbox & JSXBase.HTMLAttributes<HTMLUtrechtTextboxElement>;
             "utrecht-url-data": LocalJSX.UtrechtUrlData & JSXBase.HTMLAttributes<HTMLUtrechtUrlDataElement>;
+            "utrecht-wrap-alternative": LocalJSX.UtrechtWrapAlternative & JSXBase.HTMLAttributes<HTMLUtrechtWrapAlternativeElement>;
         }
     }
 }
diff --git a/packages/web-component-library-stencil/src/components/flex-wrap-fallback.scss b/packages/web-component-library-stencil/src/components/flex-wrap-fallback.scss
@@ -0,0 +1,24 @@
+/**
+ * @license EUPL-1.2
+ * Copyright (c) 2020-2022 Gemeente Utrecht
+ * Copyright (c) 2020-2022 Frameless B.V.
+ */
+
+:host {
+  display: block;
+}
+
+:host([hidden]) {
+  display: none !important;
+}
+
+.utrecht-flex-wrap-fallback__content--hidden,
+.utrecht-flex-wrap-fallback__fallback--hidden {
+  block-size: 0;
+  opacity: 0%;
+  outline: 0;
+  overflow: hidden;
+  pointer-events: none;
+  position: relative;
+  user-select: none;
+}
diff --git a/packages/web-component-library-stencil/src/components/flex-wrap-fallback.tsx b/packages/web-component-library-stencil/src/components/flex-wrap-fallback.tsx
@@ -0,0 +1,83 @@
+/**
+ * @license EUPL-1.2
+ * Copyright (c) 2020-2022 Gemeente Utrecht
+ * Copyright (c) 2020-2022 Frameless B.V.
+ */
+
+import { Component, Element, h, Prop, State } from '@stencil/core';
+
+/**
+ * Checks if an element has `flex-wrap: wrap` and the content wraps over multiple lines
+ */
+const hasFlexboxWrap = (el: Element) => {
+  const win = el?.ownerDocument?.defaultView;
+
+  const style = win?.getComputedStyle(el);
+
+  if (style && style.getPropertyValue('flex-wrap') === 'wrap' && style.getPropertyValue('display') === 'flex') {
+    // TODO: Account for writing-mode vertical
+    return el.firstElementChild.getBoundingClientRect().top !== el.lastElementChild.getBoundingClientRect().top;
+  } else {
+    return false;
+  }
+};
+
+@Component({
+  tag: 'utrecht-flex-wrap-fallback',
+  styleUrl: 'flex-wrap-fallback.scss',
+  shadow: true,
+})
+export class FlexWrapFallback {
+  @Element() hostElement: HTMLElement;
+
+  /* ID reference for element with `display: flex;` or `display: inline-flex` and `flex-wrap: wrap` */
+  @Prop({ attribute: 'flextarget', reflect: true }) flexTarget?: string;
+  @State() resizeObserver: ResizeObserver;
+  @State() contentWraps: boolean;
+
+  connectedCallback() {
+    if (!this.resizeObserver) {
+      this.resizeObserver = new ResizeObserver(() => {
+        // TODO: Support updating `flextarget` attribute, switch ResizeObserver to match
+        // TODO: Escape ID selector CSS query
+        const cssSelector = this.flexTarget ? `#${this.flexTarget}` : ':not([slot])';
+        const flexTargetEl = this.hostElement.querySelector(cssSelector);
+        console.log(cssSelector, flexTargetEl);
+        this.contentWraps = !!flexTargetEl && hasFlexboxWrap(flexTargetEl);
+      });
+    }
+
+    this.resizeObserver.observe(this.hostElement);
+  }
+
+  disconnectedCallback() {
+    this.resizeObserver?.unobserve(this.hostElement);
+  }
+  render() {
+    const { contentWraps } = this;
+    return (
+      <div>
+        <div
+          id="wrap"
+          class={`utrecht-flex-wrap-fallback__content ${
+            contentWraps ? 'utrecht-flex-wrap-fallback__content--hidden' : ''
+          }`}
+          data-inert={contentWraps}
+          aria-hidden={contentWraps}
+        >
+          <slot></slot>
+        </div>
+        <div
+          id="nowrap"
+          class={`utrecht-flex-wrap-fallback__fallback ${
+            contentWraps ? '' : 'utrecht-flex-wrap-fallback__fallback--hidden'
+          }`}
+          data-inert={!contentWraps}
+          hidden={!contentWraps}
+        >
+          <slot name="fallback"></slot>
+        </div>
+      </div>
+    );
+  }
+}