feat(ui-toolkit,governance): description preview and read more pattern (#4599)

Co-authored-by: Joe <joe@vega.xyz>

apps/governance/src/routes/proposals/components/proposal-description/proposal-description.tsx

@@ -1,31 +1,15 @@
 import ReactMarkdown from 'react-markdown';
-import { useState } from 'react';
-import { useTranslation } from 'react-i18next';
-import { RoundedWrapper } from '@vegaprotocol/ui-toolkit';
-import { SubHeading } from '../../../../components/heading';
-import { CollapsibleToggle } from '../../../../components/collapsible-toggle';
+import { RoundedWrapper, ShowMore } from '@vegaprotocol/ui-toolkit';
 
 export const ProposalDescription = ({
   description,
 }: {
   description: string;
-}) => {
-  const { t } = useTranslation();
-  const [showDescription, setShowDescription] = useState(false);
-
-  return (
+}) => (
   <section data-testid="proposal-description">
-      <CollapsibleToggle
-        toggleState={showDescription}
-        setToggleState={setShowDescription}
-        dataTestId={'proposal-description-toggle'}
-      >
-        <SubHeading title={t('proposalDescription')} />
-      </CollapsibleToggle>
-
-      {showDescription && (
     <RoundedWrapper paddingBottom={true} marginBottomLarge={true}>
       <div className="p-2">
+        <ShowMore>
           <ReactMarkdown
             className="react-markdown-container"
             /* Prevents HTML embedded in the description from rendering */
@@ -36,9 +20,8 @@ export const ProposalDescription = ({
           >
             {description}
           </ReactMarkdown>
+        </ShowMore>
       </div>
     </RoundedWrapper>
-      )}
   </section>
-  );
-};
+);

libs/ui-toolkit/src/components/index.ts

@@ -34,6 +34,7 @@ export * from './progress-bar';
 export * from './radio-group';
 export * from './rounded-wrapper';
 export * from './select';
+export * from './show-more';
 export * from './simple-grid';
 export * from './slider';
 export * from './sparkline';

libs/ui-toolkit/src/components/show-more/index.ts

@@ -0,0 +1 @@
+export * from './show-more';

libs/ui-toolkit/src/components/show-more/show-more.spec.tsx

@@ -0,0 +1,9 @@
+import { render } from '@testing-library/react';
+import { ShowMore } from './show-more';
+
+describe('Button', () => {
+  it('should render successfully', () => {
+    const { baseElement } = render(<ShowMore>test</ShowMore>);
+    expect(baseElement).toBeTruthy();
+  });
+});

libs/ui-toolkit/src/components/show-more/show-more.stories.tsx

@@ -0,0 +1,50 @@
+import type { Story, Meta } from '@storybook/react';
+import { ShowMore } from './show-more';
+
+export default {
+  component: ShowMore,
+  title: 'ShowMore',
+} as Meta;
+
+const Template: Story = (args) => (
+  <ShowMore {...args}>
+    <p>
+      Spaceflight will never tolerate carelessness, incapacity, and neglect.
+      Somewhere, somehow, we screwed up. It could have been in design, build, or
+      test. Whatever it was, we should have caught it. We were too gung ho about
+      the schedule and we locked out all of the problems we saw each day in our
+      work. “Every element of the program was in trouble and so were we. The
+      simulators were not working, Mission Control was behind in virtually every
+      area, and the flight and test procedures changed daily. Nothing we did had
+      any shelf life. Not one of us stood up and said, ‘Dammit, stop!’ I don’t
+      know what Thompson’s committee will find as the cause, but I know what I
+      find. We are the cause! We were not ready! We did not do our job. We were
+      rolling the dice, hoping that things would come together by launch day,
+      when in our hearts we knew it would take a miracle. We were pushing the
+      schedule and betting that the Cape would slip before we did. “From this
+      day forward, Flight Control will be known by two words: ‘Tough’ and
+      ‘Competent.’ Tough means we are forever accountable for what we do or what
+      we fail to do. We will never again compromise our responsibilities. Every
+      time we walk into Mission Control we will know what we stand for.
+      Competent means we will never take anything for granted. We will never be
+      found short in our knowledge and in our skills. Mission Control will be
+      perfect. When you leave this meeting today you will go to your office and
+      the first thing you will do there is to write ‘Tough and Competent’ on
+      your blackboards. It will never be erased. Each day when you enter the
+      room these words will remind you of the price paid by Grissom, White, and
+      Chaffee. These words are the price of admission to the ranks of Mission
+      Control.
+    </p>
+  </ShowMore>
+);
+
+export const Default = Template.bind({});
+export const CustomMaxHeight = Template.bind({});
+CustomMaxHeight.args = {
+  closedMaxHeightPx: 50,
+};
+
+export const CustomOverlayColour = Template.bind({});
+CustomOverlayColour.args = {
+  overlayColourOverrides: 'to-yellow-400',
+};

libs/ui-toolkit/src/components/show-more/show-more.tsx

@@ -0,0 +1,78 @@
+import classNames from 'classnames';
+import { useRef, useState, useEffect } from 'react';
+import { t } from '@vegaprotocol/i18n';
+import { Button } from '../button';
+import type { ReactNode } from 'react';
+
+type ShowMoreProps = {
+  children: ReactNode;
+  closedMaxHeightPx?: number;
+  overlayColourOverrides?: string;
+};
+
+export const ShowMore = ({
+  children,
+  closedMaxHeightPx = 125,
+  overlayColourOverrides,
+}: ShowMoreProps) => {
+  const containerRef = useRef<HTMLDivElement | null>(null);
+  const [expanded, setExpanded] = useState(false);
+
+  useEffect(() => {
+    const checkHeight = () => {
+      const container = containerRef.current;
+      if (container) {
+        container.scrollHeight < closedMaxHeightPx
+          ? setExpanded(true)
+          : setExpanded(false);
+      }
+    };
+
+    checkHeight();
+
+    window.addEventListener('resize', checkHeight);
+
+    return () => {
+      window.removeEventListener('resize', checkHeight);
+    };
+  }, [closedMaxHeightPx]);
+
+  const containerClasses = classNames(
+    'overflow-hidden transition-all ease-in-out duration-300',
+    {
+      'max-h-none': expanded,
+    }
+  );
+
+  const overlayClasses = classNames(
+    `absolute w-full h-16 bottom-0 left-0 transition-opacity duration-300 bg-gradient-to-b from-transparent ${
+      overlayColourOverrides ? overlayColourOverrides : 'to-white dark:to-black'
+    }`,
+    {
+      hidden: expanded,
+    }
+  );
+
+  return (
+    <>
+      <div className="relative">
+        <div
+          ref={containerRef}
+          className={containerClasses}
+          style={{ maxHeight: expanded ? 'none' : `${closedMaxHeightPx}px` }}
+        >
+          {children}
+        </div>
+        <div className={overlayClasses}></div>
+      </div>
+
+      {!expanded && (
+        <div className="mt-1 text-center">
+          <Button size={'sm'} onClick={() => setExpanded(true)}>
+            {t('Show more')}
+          </Button>
+        </div>
+      )}
+    </>
+  );
+};