feat: redesign toast notifications for UX (#148)

Co-authored-by: userAdityaa <aditya.chaudhary1558@gmail.com>
Co-committed-by: userAdityaa <aditya.chaudhary1558@gmail.com>

src/app/components/Toast.svelte

@@ -1,28 +1,98 @@
 <script lang="ts">
   import {parse, renderAsHtml} from "@welshman/content"
+  import Close from "@assets/icons/close.svg?dataurl"
   import {fly} from "@lib/transition"
-  import CloseCircle from "@assets/icons/close-circle.svg?dataurl"
   import Icon from "@lib/components/Icon.svelte"
   import Button from "@lib/components/Button.svelte"
   import {toast, popToast} from "@app/util/toast"
 
+  let touchStartY = 0
+  let touchStartTime = 0
+  let dragY = $state(0)
+  let isSettling = $state(false)
+  let containerEl = $state<HTMLDivElement | undefined>(undefined)
+
+  $effect(() => {
+    if ($toast) {
+      dragY = 0
+      isSettling = false
+    }
+  })
+
+  $effect(() => {
+    if (!containerEl) return
+    containerEl.addEventListener("touchmove", onTouchMove, {passive: false})
+    return () => containerEl!.removeEventListener("touchmove", onTouchMove)
+  })
+
   const onActionClick = () => {
     $toast!.action!.onclick()
     popToast($toast!.id)
   }
+
+  const onClose = () => popToast($toast!.id)
+
+  const onTouchStart = (e: TouchEvent) => {
+    touchStartY = e.touches[0].clientY
+    touchStartTime = Date.now()
+    dragY = 0
+    isSettling = false
+  }
+
+  const onTouchMove = (e: TouchEvent) => {
+    const delta = e.touches[0].clientY - touchStartY
+    if (delta < 0) {
+      e.preventDefault()
+      isSettling = false
+      dragY = delta
+    } else {
+      dragY = 0
+    }
+  }
+
+  const onTouchEnd = (e: TouchEvent) => {
+    const delta = e.changedTouches[0].clientY - touchStartY
+    const duration = Date.now() - touchStartTime
+    const isQuickFlick = duration < 400 && delta < 0
+    const isSlowDismiss = delta < -40
+
+    if (isQuickFlick || isSlowDismiss) {
+      dragY = 0
+      popToast($toast!.id)
+    } else {
+      isSettling = true
+      dragY = 0
+      setTimeout(() => {
+        isSettling = false
+      }, 200)
+    }
+  }
 </script>
 
 {#if $toast}
   {@const theme = $toast.theme || "info"}
-  <div transition:fly class="bottom-sai right-sai toast z-toast">
+  <div
+    bind:this={containerEl}
+    transition:fly={{y: -20}}
+    class="fixed z-toast top-[calc(var(--sait)+0.5rem)] left-[calc(var(--sail)+0.5rem)] right-[calc(var(--sair)+0.5rem)] flex flex-col gap-2 md:right-4 md:bottom-4 md:top-auto md:left-auto md:w-80"
+    style={dragY !== 0 || isSettling
+      ? `transform: translateY(${dragY}px)${isSettling ? "; transition: transform 200ms ease-out" : ""}`
+      : ""}
+    ontouchstart={onTouchStart}
+    ontouchend={onTouchEnd}>
     {#key $toast.id}
       <div
         role="alert"
-        class="alert flex justify-center whitespace-normal text-left"
+        class="alert relative flex justify-center whitespace-normal text-left"
         class:bg-base-100={theme === "info"}
         class:text-base-content={theme === "info"}
         class:alert-error={theme === "error"}>
-        <p class:welshman-content-error={theme === "error"}>
+        <Button
+          class="absolute -top-2 -right-2 btn btn-circle btn-neutral btn-xs hidden md:inline-flex"
+          onclick={onClose}>
+          <Icon icon={Close} size={3} />
+        </Button>
+        <p class="md:pr-6" class:welshman-content-error={theme === "error"}>
           {#if $toast.message}
             {@html renderAsHtml(parse({content: $toast.message}))}
             {#if $toast.action}
@@ -35,9 +105,6 @@
             <Component toast={$toast} {...props} />
           {/if}
         </p>
-        <Button class="flex items-center opacity-75" onclick={() => popToast($toast.id)}>
-          <Icon icon={CloseCircle} />
-        </Button>
       </div>
     {/key}
   </div>