Improve Loading in figma plugin (#866)

* Add skeleton

* improve icon loading

packages/lucide-figma/src/api/fetchIcons.ts

@@ -66,3 +66,24 @@ export const getIcons = () => new Promise<LucideIcons>(async (resolve, reject)=>
     }
   }
 });
+
+type EventCallback = (lucideIcons: LucideIcons) => void
+
+export const iconFetchListener = (callback: EventCallback) => {
+  fetchIcons()
+
+  const handleEvent = (event: MessageEvent) => {
+    if (event.type === 'message' && event?.data?.pluginMessage.type === 'cachedIcons') {
+
+      const lucideIcons = event?.data?.pluginMessage?.cachedIcons
+      callback(lucideIcons)
+    }
+  }
+
+  window.addEventListener('message', handleEvent)
+
+  const removeListener = () => {
+    window.removeEventListener('message', handleEvent)
+  }
+  return removeListener
+}

packages/lucide-figma/src/components/IconButton/IconButton.scss

@@ -6,9 +6,11 @@
   border-radius: 2px;
   appearance: none;
   outline: 0;
+
   &:hover {
     background: rgba(0, 0, 0, 0.06);
   }
+
   &:focus,
   &:active {
     box-shadow: inset 0 0 0 2px var(--color-blue);

packages/lucide-figma/src/components/SearchInput/SearchInput.tsx

@@ -6,9 +6,10 @@ interface SearchInputProps extends React.HTMLProps<HTMLDivElement> {
   value: string,
   iconCount: number,
   onChange: (event: ChangeEvent<HTMLInputElement>) => void
+  placeholder: string
 }
 
-function SearchInput({ value, onChange, iconCount, className, ...props }: SearchInputProps) {
+function SearchInput({ value, onChange, placeholder, className, ...props }: SearchInputProps) {
   return (
     <div
       className="search-input"
@@ -20,7 +21,7 @@ function SearchInput({ value, onChange, iconCount, className, ...props }: Search
         type="search"
         value={value}
         onChange={onChange}
-        placeholder={`Search ${iconCount} icons`}
+        placeholder={placeholder}
         className="input__field"
       />
     </div>

packages/lucide-figma/src/components/Skeleton/Skeleton.scss

@@ -0,0 +1,25 @@
+@keyframes load {
+  to {
+    background-position: 200% 0;
+  }
+}
+
+.skeleton {
+  --block: rgba(0, 0, 0, 0.06);
+  --loader: hsl(0 0% 89%);
+
+  background: linear-gradient(
+    -75deg,
+    transparent 40%,
+    var(--loader),
+    transparent 60%
+  ) 0 0 / 200% 100%,
+    var(--block);
+
+  border-radius: calc(var(--padding) * 0.5);
+  animation: load 2s infinite linear;
+  background-attachment: fixed;
+  width: 40px;
+  height: 40px;
+  border-radius: 2px;
+}

packages/lucide-figma/src/components/Skeleton/Skeleton.tsx

@@ -0,0 +1,13 @@
+import './Skeleton.scss'
+
+const Skeleton = () => {
+  return (
+    <>
+      {Array.from({length: 48 }, () => (
+        <div className="skeleton"/>
+      ))}
+    </>
+  )
+}
+
+export default Skeleton

packages/lucide-figma/src/interface/interface.tsx

@@ -6,7 +6,7 @@ type Views = typeof views
 
 import useSearch, { Icon } from '../hooks/useSearch'
 
-import { getIcons } from '../api/fetchIcons'
+import { getIcons, iconFetchListener, LucideIcons } from '../api/fetchIcons'
 import './interface.scss'
 import Menu from '../components/Menu'
 
@@ -19,21 +19,19 @@ function App() {
 
   const searchResults = useMemo(() => useSearch(icons, tags, query), [icons, query])
 
-  const getLatestIcons = async () => {
-    const lucideIcons = await getIcons()
+  const handleFetchResponse = async (lucideIcons: LucideIcons) => {
+    const icons = Object.entries(lucideIcons.iconNodes)
 
-    setIcons(Object.entries(lucideIcons.iconNodes))
+    setIcons(icons)
     setTags(lucideIcons.tags)
     setVersion(lucideIcons.version)
   }
 
   useEffect(() => {
-    getLatestIcons()
-  }, [])
+    const removeListener = iconFetchListener(handleFetchResponse)
 
-  if(!icons.length) {
-    return null
-  }
+    return removeListener
+  }, [])
 
   const View = views?.[page as keyof Views] ?? views.icons
 

packages/lucide-figma/src/views/Icons.tsx

@@ -2,6 +2,7 @@ import IconButton from '../components/IconButton'
 import SearchInput from '../components/SearchInput'
 import createIconComponent from '../helpers/createIconComponent'
 import { Icon } from '../hooks/useSearch'
+import Skeleton from '../components/Skeleton/Skeleton'
 
 interface PageProps {
   query: string
@@ -24,16 +25,22 @@ const Icons = ({
         value={query}
         iconCount={icons.length}
         onChange={(event)  => setQuery(event.target.value)}
+        placeholder={icons.length ? `Search ${icons.length} icons`: 'Loading icons ..'}
       />
         <main>
           <div className='icon-grid'>
-            {searchResults.map(([name, iconNode] :any) => (
-              <IconButton
-                name={name}
-                key={name}
-                component={createIconComponent(name, iconNode)}
-              />
-            ))}
+            {icons.length ? (
+              searchResults.map(([name, iconNode]: any) => (
+                <IconButton
+                  name={name}
+                  key={name}
+                  component={createIconComponent(name, iconNode)}
+                />
+              ))
+            ) : (
+              <Skeleton />
+            )}
+
           </div>
           <footer>
             <a