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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 | import type { Meta, StoryObj } from '@storybook/react' import { useState } from 'react' import { PagePlaceholder } from './PagePlaceholder' import type { WorksheetFormState } from '../types' const meta = { title: 'Worksheets/Preview/WorksheetPreview', parameters: { layout: 'fullscreen', }, tags: ['autodocs'], } satisfies Meta export default meta type Story = StoryObj<typeof meta> // Mock preview component that simulates virtual loading without API calls function MockPreviewWithVirtualLoading({ pages = 5, formState, }: { pages?: number formState: WorksheetFormState }) { const [loadedPages, setLoadedPages] = useState(new Set([0])) return ( <div style={{ height: '100%', overflow: 'auto', background: '#e5e7eb', padding: '20px', }} onScroll={(e) => { const container = e.currentTarget const scrollTop = container.scrollTop const clientHeight = container.clientHeight // Simulate loading pages as they come into view // Each page is about 1056px + 48px gap = 1104px const pageHeight = 1104 const visiblePageStart = Math.floor(scrollTop / pageHeight) const visiblePageEnd = Math.ceil((scrollTop + clientHeight) / pageHeight) const newLoadedPages = new Set(loadedPages) for (let i = visiblePageStart; i <= Math.min(visiblePageEnd, pages - 1); i++) { if (!newLoadedPages.has(i)) { newLoadedPages.add(i) // Simulate async loading delay setTimeout(() => { setLoadedPages((prev) => new Set([...prev, i])) }, 500) } } }} > <div style={{ display: 'flex', flexDirection: 'column', gap: '48px', alignItems: 'center', }} > {Array.from({ length: pages }).map((_, index) => { const orientation = formState.orientation || 'portrait' const maxWidth = orientation === 'portrait' ? '816px' : '1056px' return ( <div key={index} style={{ width: '100%', maxWidth }}> <PagePlaceholder pageNumber={index + 1} orientation={orientation} rows={Math.ceil((formState.problemsPerPage || 20) / (formState.cols || 4))} cols={formState.cols || 4} loading={!loadedPages.has(index)} /> </div> ) })} </div> </div> ) } // Wrapper component function PreviewWrapper({ formState, pages }: { formState: WorksheetFormState; pages?: number }) { return ( <div style={{ height: '100vh', display: 'flex', flexDirection: 'column' }}> <MockPreviewWithVirtualLoading formState={formState} pages={pages} /> </div> ) } const mockFormState: WorksheetFormState = { operator: 'addition', mode: 'manual', digitRange: { min: 2, max: 3 }, problemsPerPage: 20, pages: 5, cols: 4, orientation: 'portrait', name: 'Student Name', displayRules: { tenFrames: 'whenRegrouping', carryBoxes: 'whenRegrouping', placeValueColors: 'whenRegrouping', answerBoxes: 'always', problemNumbers: 'always', cellBorders: 'always', borrowNotation: 'never', borrowingHints: 'never', }, pAnyStart: 0.3, pAllStart: 0.1, interpolate: false, seed: 12345, } export const SinglePage: Story = { render: () => <PreviewWrapper formState={{ ...mockFormState, pages: 1 }} pages={1} />, } export const FivePages: Story = { render: () => <PreviewWrapper formState={mockFormState} pages={5} />, } export const ManyPages: Story = { render: () => { return ( <div style={{ height: '100vh', width: '100vw' }}> <div style={{ position: 'absolute', top: '16px', left: '50%', transform: 'translateX(-50%)', zIndex: 1000, background: '#fef3c7', padding: '12px 20px', borderRadius: '8px', fontSize: '13px', boxShadow: '0 4px 6px rgba(0,0,0,0.1)', maxWidth: '700px', }} > <strong>⚡ Virtual Loading Demo:</strong> This worksheet has 20 pages (400 problems). Only visible pages are loaded. Scroll down to see pages load on-demand with a loading state (hourglass), then display content. Notice smooth scrolling even with hundreds of problems! </div> <PreviewWrapper formState={{ ...mockFormState, pages: 20 }} pages={20} /> </div> ) }, } export const ExtremeScale: Story = { render: () => { return ( <div style={{ height: '100vh', width: '100vw' }}> <div style={{ position: 'absolute', top: '16px', left: '50%', transform: 'translateX(-50%)', zIndex: 1000, background: '#fee2e2', padding: '12px 20px', borderRadius: '8px', fontSize: '13px', boxShadow: '0 4px 6px rgba(0,0,0,0.1)', maxWidth: '700px', }} > <strong>🚀 Extreme Scale:</strong> 50 pages × 20 problems = 1,000 problems! Virtual loading makes this performant. Only 3 pages load initially, rest load as you scroll. Try scrolling through - it stays smooth! </div> <PreviewWrapper formState={{ ...mockFormState, pages: 50 }} pages={50} /> </div> ) }, } export const LandscapeOrientation: Story = { render: () => ( <PreviewWrapper formState={{ ...mockFormState, orientation: 'landscape', cols: 5, pages: 5, }} pages={5} /> ), } export const DenseLayout: Story = { render: () => ( <PreviewWrapper formState={{ ...mockFormState, problemsPerPage: 30, cols: 5, pages: 3 }} pages={3} /> ), } export const SparseLayout: Story = { render: () => ( <PreviewWrapper formState={{ ...mockFormState, problemsPerPage: 10, cols: 2, pages: 5 }} pages={5} /> ), } export const InitialLoadingState: Story = { render: () => { return ( <div style={{ height: '100vh', width: '100vw' }}> <div style={{ position: 'absolute', top: '16px', left: '50%', transform: 'translateX(-50%)', zIndex: 1000, background: '#eff6ff', padding: '12px 20px', borderRadius: '8px', fontSize: '13px', boxShadow: '0 4px 6px rgba(0,0,0,0.1)', }} > <strong>🔄 Loading Behavior:</strong> This demonstrates the initial loading state. The first page loads immediately, others show placeholders with a loading spinner until you scroll them into view. </div> <PreviewWrapper formState={{ ...mockFormState, pages: 10 }} pages={10} /> </div> ) }, } export const VirtualizationExplained: Story = { render: () => { return ( <div style={{ height: '100vh', display: 'flex', flexDirection: 'column', padding: '20px', gap: '20px', overflow: 'auto', }} > <div style={{ background: '#f3f4f6', padding: '20px', borderRadius: '12px', maxWidth: '800px', margin: '0 auto', }} > <h2 style={{ margin: '0 0 16px 0', fontSize: '20px', fontWeight: 600 }}> Virtual Loading System </h2> <div style={{ display: 'flex', flexDirection: 'column', gap: '12px', fontSize: '14px', }} > <div> <strong>📦 Batch Loading:</strong> <p style={{ margin: '4px 0 0 0', color: '#6b7280' }}> Initial request loads first 3 pages. Additional pages load in batches as you scroll. </p> </div> <div> <strong>👁️ Intersection Observer:</strong> <p style={{ margin: '4px 0 0 0', color: '#6b7280' }}> Tracks which pages are visible in the viewport. Triggers loading when pages come into view. </p> </div> <div> <strong>🎯 Smart Preloading:</strong> <p style={{ margin: '4px 0 0 0', color: '#6b7280' }}> When a page becomes visible, adjacent pages (above and below) are also loaded for smooth scrolling. </p> </div> <div> <strong>⚡ Performance:</strong> <p style={{ margin: '4px 0 0 0', color: '#6b7280' }}> Handles 50+ page worksheets (1,000+ problems) smoothly. Only renders what's needed. </p> </div> <div> <strong>💾 React Query Caching:</strong> <p style={{ margin: '4px 0 0 0', color: '#6b7280' }}> Fetched pages are cached. Scrolling back doesn't re-fetch. Changes to settings invalidate cache. </p> </div> </div> </div> <div style={{ flex: 1, minHeight: '600px' }}> <PreviewWrapper formState={{ ...mockFormState, pages: 15 }} pages={15} /> </div> </div> ) }, } |