feat(ComparisonView): add redesigned font comparison widget
This commit is contained in:
Ilia Mashkov
236
src/widgets/ComparisonView/ui/SliderArea/SliderArea.svelte
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236
src/widgets/ComparisonView/ui/SliderArea/SliderArea.svelte
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<!--
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Component: ComparisonSlider
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A multiline text comparison slider that morphs between two fonts.
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Features:
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- Multiline support with precise line breaking matching container width.
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- Character-level morphing: Font changes exactly when the slider passes the character's global position.
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- Responsive layout with Tailwind breakpoints for font sizing.
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- Performance optimized using offscreen canvas for measurements and transform-based animations.
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-->
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<script lang="ts">
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import {
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type CharacterComparison,
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type ResponsiveManager,
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createCharacterComparison,
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debounce,
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} from '$shared/lib';
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import { cn } from '$shared/shadcn/utils/shadcn-utils';
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import { Loader } from '$shared/ui';
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import { getContext } from 'svelte';
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import { Spring } from 'svelte/motion';
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import { fade } from 'svelte/transition';
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import { comparisonStore } from '../../model';
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import Character from '../Character/Character.svelte';
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import Line from '../Line/Line.svelte';
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import Thumb from '../Thumb/Thumb.svelte';
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interface Props {
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/**
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* Sidebar open state
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* @default false
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*/
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isSidebarOpen?: boolean;
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/**
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* CSS classes
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*/
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class?: string;
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}
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let { isSidebarOpen = false, class: className }: Props = $props();
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const fontA = $derived(comparisonStore.fontA);
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const fontB = $derived(comparisonStore.fontB);
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const isLoading = $derived(comparisonStore.isLoading || !comparisonStore.isReady);
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const typography = $derived(comparisonStore.typography);
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let container = $state<HTMLElement>();
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let measureCanvas = $state<HTMLCanvasElement>();
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const responsive = getContext<ResponsiveManager>('responsive');
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const isMobile = $derived(responsive?.isMobile ?? false);
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let isDragging = $state(false);
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const charComparison: CharacterComparison = createCharacterComparison(
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() => comparisonStore.text,
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() => fontA,
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() => fontB,
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() => typography.weight,
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() => typography.renderedSize,
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);
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let lineElements = $state<(HTMLElement | undefined)[]>([]);
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const sliderSpring = new Spring(50, {
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stiffness: 0.2,
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damping: 0.7,
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});
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const sliderPos = $derived(sliderSpring.current);
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function handleMove(e: PointerEvent) {
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if (!isDragging || !container) return;
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const rect = container.getBoundingClientRect();
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const x = Math.max(0, Math.min(e.clientX - rect.left, rect.width));
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const percentage = (x / rect.width) * 100;
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sliderSpring.target = percentage;
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}
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function startDragging(e: PointerEvent) {
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e.preventDefault();
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isDragging = true;
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handleMove(e);
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}
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const storeSliderPosition = debounce((value: number) => {
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comparisonStore.sliderPosition = value;
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}, 100);
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$effect(() => {
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storeSliderPosition(sliderPos);
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});
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$effect(() => {
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if (!responsive) return;
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switch (true) {
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case responsive.isMobile:
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typography.multiplier = 0.5;
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break;
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case responsive.isTablet:
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typography.multiplier = 0.75;
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break;
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case responsive.isDesktop:
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typography.multiplier = 1;
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break;
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default:
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typography.multiplier = 1;
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}
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});
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$effect(() => {
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if (isDragging) {
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window.addEventListener('pointermove', handleMove);
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const stop = () => (isDragging = false);
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window.addEventListener('pointerup', stop);
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return () => {
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window.removeEventListener('pointermove', handleMove);
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window.removeEventListener('pointerup', stop);
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};
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}
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});
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$effect(() => {
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const _text = comparisonStore.text;
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const _weight = typography.weight;
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const _size = typography.renderedSize;
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const _height = typography.height;
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if (container && measureCanvas && fontA && fontB) {
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requestAnimationFrame(() => {
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charComparison.breakIntoLines(container, measureCanvas);
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});
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}
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});
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$effect(() => {
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if (typeof window === 'undefined') return;
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const handleResize = () => {
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if (container && measureCanvas) {
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charComparison.breakIntoLines(container, measureCanvas);
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}
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};
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window.addEventListener('resize', handleResize);
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return () => window.removeEventListener('resize', handleResize);
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});
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// Dynamic backgroundSize based on isMobile — can't express this in Tailwind.
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// Color is set to currentColor so it respects dark mode via text color.
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const gridStyle = $derived(
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`background-image: linear-gradient(currentColor 1px, transparent 1px), linear-gradient(90deg, currentColor 1px, transparent 1px); `
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+ `background-size: ${isMobile ? '10px 10px' : '20px 20px'};`,
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);
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// Replaces motion.div animate={{ scale: isSidebarOpen && !isMobile ? 0.94 :1 }}
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const scaleClass = $derived(
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isSidebarOpen && !isMobile
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? 'scale-[0.94]'
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: 'scale-100',
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);
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</script>
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<!-- Hidden measurement canvas -->
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<canvas bind:this={measureCanvas} class="hidden" width="1" height="1"></canvas>
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<!--
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Outer flex container — fills parent.
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The paper div inside scales down when the sidebar opens on desktop.
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-->
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<div class={cn('flex-1 relative flex items-center justify-center p-0 overflow-hidden bg-surface dark:bg-dark-bg', className)}>
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<!--
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Paper surface.
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Replaces the old glassmorphism card with a clean white/dark sheet.
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Scale transition replaces motion.div spring — CSS transition-transform
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is smooth enough here; a JS spring would add ~4kb for minimal gain.
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-->
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<div
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class={cn(
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'w-full h-full flex flex-col items-center justify-center relative',
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'bg-white dark:bg-[#1e1e1e]',
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'shadow-2xl shadow-black/5 dark:shadow-black/20',
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'transition-transform duration-300 ease-out',
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scaleClass,
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)}
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>
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<!-- Subtle grid overlay — pointer-events-none, very low opacity -->
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<div
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class="absolute inset-0 pointer-events-none opacity-[0.03] dark:opacity-[0.05] text-black dark:text-white"
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style={gridStyle}
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aria-hidden="true"
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>
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</div>
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<!-- Slider interaction area -->
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<div class="w-full h-full flex items-center justify-center p-4 md:p-8 overflow-hidden">
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{#if isLoading}
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<div out:fade={{ duration: 300 }}>
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<Loader size={24} />
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</div>
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{:else}
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<div
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bind:this={container}
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role="slider"
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tabindex="0"
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aria-valuenow={Math.round(sliderPos)}
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aria-label="Font comparison slider"
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onpointerdown={startDragging}
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class="
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relative w-full max-w-6xl h-full
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flex flex-col justify-center
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select-none touch-none cursor-ew-resize
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py-8 px-4 sm:py-12 sm:px-8 md:py-16 md:px-12 lg:py-20 lg:px-24
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"
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in:fade={{ duration: 300, delay: 300 }}
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out:fade={{ duration: 300 }}
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>
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<!-- Character lines -->
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<div
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class="
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relative flex flex-col items-center gap-3 sm:gap-4
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z-10 pointer-events-none text-center
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my-auto
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"
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>
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{#each charComparison.lines as line, lineIndex}
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<Line bind:element={lineElements[lineIndex]} text={line.text}>
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{#snippet character({ char, index })}
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{@const { proximity, isPast } = charComparison.getCharState(index, sliderPos, lineElements[lineIndex], container)}
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<Character {char} {proximity} {isPast} />
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{/snippet}
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</Line>
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{/each}
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</div>
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<Thumb {sliderPos} {isDragging} />
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</div>
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{/if}
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</div>
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</div>
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</div>
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