| 1 | import { createStore } from "/js/AlpineStore.js"; |
| 2 | |
| 3 | const model = { |
| 4 | // State |
| 5 | currentImageUrl: null, |
| 6 | currentImageName: null, |
| 7 | baseImageUrl: null, |
| 8 | imageLoaded: false, |
| 9 | imageError: false, |
| 10 | zoomLevel: 1, |
| 11 | refreshInterval: 0, |
| 12 | activeIntervalId: null, |
| 13 | closePromise: null, |
| 14 | |
| 15 | // Image dimensions |
| 16 | naturalWidth: 0, |
| 17 | naturalHeight: 0, |
| 18 | baseScale: 1, |
| 19 | |
| 20 | // Pan state |
| 21 | panX: 0, |
| 22 | panY: 0, |
| 23 | isDragging: false, |
| 24 | dragStartX: 0, |
| 25 | dragStartY: 0, |
| 26 | dragStartPanX: 0, |
| 27 | dragStartPanY: 0, |
| 28 | activePointerId: null, |
| 29 | windowDragMoveHandler: null, |
| 30 | windowDragUpHandler: null, |
| 31 | |
| 32 | /** |
| 33 | * Open image viewer modal |
| 34 | * @param {string} imageUrl - URL of the image to display |
| 35 | * @param {number|object} refreshOrOptions - Either: |
| 36 | * - number: refresh interval in ms (legacy compat) |
| 37 | * - object: { refreshInterval?: number, name?: string } |
| 38 | */ |
| 39 | async open(imageUrl, refreshOrOptions) { |
| 40 | // Parse options (backward compatibility) |
| 41 | const options = typeof refreshOrOptions === 'number' |
| 42 | ? { refreshInterval: refreshOrOptions, name: null } |
| 43 | : refreshOrOptions || {}; |
| 44 | |
| 45 | // Reset state |
| 46 | this.baseImageUrl = imageUrl; |
| 47 | this.refreshInterval = options.refreshInterval || 0; |
| 48 | this.currentImageName = options.name || this.extractImageName(imageUrl); |
| 49 | this.imageLoaded = false; |
| 50 | this.imageError = false; |
| 51 | this.zoomLevel = 1; |
| 52 | |
| 53 | // Add timestamp for cache-busting if refreshing |
| 54 | this.currentImageUrl = this.refreshInterval > 0 |
| 55 | ? this.addTimestamp(imageUrl) |
| 56 | : imageUrl; |
| 57 | |
| 58 | try { |
| 59 | // Open modal and track close promise for cleanup |
| 60 | this.closePromise = window.openModal('modals/image-viewer/image-viewer.html'); |
| 61 | |
| 62 | // Setup cleanup on modal close |
| 63 | if (this.closePromise && typeof this.closePromise.finally === 'function') { |
| 64 | this.closePromise.finally(() => { |
| 65 | this.stopRefresh(); |
| 66 | this.resetState(); |
| 67 | }); |
| 68 | } |
| 69 | |
| 70 | // Start refresh loop if needed |
| 71 | if (this.refreshInterval > 0) { |
| 72 | this.setupAutoRefresh(); |
| 73 | } |
| 74 | } catch (error) { |
| 75 | console.error("Image viewer error:", error); |
| 76 | this.imageError = true; |
| 77 | } |
| 78 | }, |
| 79 | |
| 80 | setupAutoRefresh() { |
| 81 | // Clear any existing interval |
| 82 | this.stopRefresh(); |
| 83 | |
| 84 | this.activeIntervalId = setInterval(() => { |
| 85 | if (!this.isModalVisible()) { |
| 86 | this.stopRefresh(); |
| 87 | return; |
| 88 | } |
| 89 | this.preloadNextImage(); |
| 90 | }, this.refreshInterval); |
| 91 | }, |
| 92 | |
| 93 | async preloadNextImage() { |
| 94 | const nextSrc = this.addTimestamp(this.baseImageUrl); |
| 95 | |
| 96 | // Create a promise that resolves when the image is loaded |
| 97 | const preloadPromise = new Promise((resolve, reject) => { |
| 98 | const tempImg = new Image(); |
| 99 | tempImg.onload = () => resolve(nextSrc); |
| 100 | tempImg.onerror = reject; |
| 101 | tempImg.src = nextSrc; |
| 102 | }); |
| 103 | |
| 104 | try { |
| 105 | // Wait for preload to complete |
| 106 | const loadedSrc = await preloadPromise; |
| 107 | |
| 108 | // Check if modal is still visible before updating |
| 109 | if (this.isModalVisible()) { |
| 110 | this.currentImageUrl = loadedSrc; |
| 111 | this.imageLoaded = false; // Trigger reload animation |
| 112 | } |
| 113 | } catch (err) { |
| 114 | console.error('Failed to preload image:', err); |
| 115 | } |
| 116 | }, |
| 117 | |
| 118 | isModalVisible() { |
| 119 | const container = document.querySelector('#image-viewer-wrapper'); |
| 120 | if (!container) return false; |
| 121 | |
| 122 | // Check if element or any parent is hidden |
| 123 | let element = container; |
| 124 | while (element) { |
| 125 | const styles = window.getComputedStyle(element); |
| 126 | if (styles.display === 'none' || styles.visibility === 'hidden') { |
| 127 | return false; |
| 128 | } |
| 129 | element = element.parentElement; |
| 130 | } |
| 131 | return true; |
| 132 | }, |
| 133 | |
| 134 | stopRefresh() { |
| 135 | if (this.activeIntervalId !== null) { |
| 136 | clearInterval(this.activeIntervalId); |
| 137 | this.activeIntervalId = null; |
| 138 | } |
| 139 | }, |
| 140 | |
| 141 | resetState() { |
| 142 | this.currentImageUrl = null; |
| 143 | this.currentImageName = null; |
| 144 | this.baseImageUrl = null; |
| 145 | this.imageLoaded = false; |
| 146 | this.imageError = false; |
| 147 | this.zoomLevel = 1; |
| 148 | this.refreshInterval = 0; |
| 149 | this.naturalWidth = 0; |
| 150 | this.naturalHeight = 0; |
| 151 | this.baseScale = 1; |
| 152 | this.panX = 0; |
| 153 | this.panY = 0; |
| 154 | this.isDragging = false; |
| 155 | this.activePointerId = null; |
| 156 | this.removeWindowDragListeners(); |
| 157 | }, |
| 158 | |
| 159 | onImageLoad(event) { |
| 160 | const img = event.target; |
| 161 | this.naturalWidth = img.naturalWidth; |
| 162 | this.naturalHeight = img.naturalHeight; |
| 163 | this.imageLoaded = true; |
| 164 | this.zoomLevel = 1; |
| 165 | this.panX = 0; |
| 166 | this.panY = 0; |
| 167 | // Reset any previous transform |
| 168 | img.classList.remove('zoomed'); |
| 169 | img.style.width = ''; |
| 170 | img.style.height = ''; |
| 171 | img.style.transform = ''; |
| 172 | }, |
| 173 | |
| 174 | // Drag/pan methods |
| 175 | startDrag(event) { |
| 176 | // Pointer events: mouse (button 0) or touch/pen (button can be -1/undefined) |
| 177 | if (typeof event.button === 'number' && event.button !== 0) return; |
| 178 | event.preventDefault(); |
| 179 | |
| 180 | this.isDragging = true; |
| 181 | this.activePointerId = typeof event.pointerId === 'number' ? event.pointerId : null; |
| 182 | this.dragStartX = event.clientX; |
| 183 | this.dragStartY = event.clientY; |
| 184 | this.dragStartPanX = this.panX; |
| 185 | this.dragStartPanY = this.panY; |
| 186 | |
| 187 | const canvas = document.querySelector('.image-canvas'); |
| 188 | if (canvas && this.activePointerId !== null && typeof canvas.setPointerCapture === 'function') { |
| 189 | try { |
| 190 | canvas.setPointerCapture(this.activePointerId); |
| 191 | } catch (e) { |
| 192 | // ignore |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | this.addWindowDragListeners(); |
| 197 | }, |
| 198 | |
| 199 | onDrag(event) { |
| 200 | if (!this.isDragging) return; |
| 201 | if (this.activePointerId !== null && typeof event.pointerId === 'number' && event.pointerId !== this.activePointerId) { |
| 202 | return; |
| 203 | } |
| 204 | event.preventDefault(); |
| 205 | const dx = event.clientX - this.dragStartX; |
| 206 | const dy = event.clientY - this.dragStartY; |
| 207 | this.panX = this.dragStartPanX + dx; |
| 208 | this.panY = this.dragStartPanY + dy; |
| 209 | this.updateImageTransform(); |
| 210 | }, |
| 211 | |
| 212 | onWheel(event) { |
| 213 | // Trackpad scrolling on macOS reports both deltaX and deltaY. |
| 214 | // Prevent the modal/page from scrolling and instead pan the image. |
| 215 | if (!event) return; |
| 216 | |
| 217 | // Avoid fighting with an active drag. |
| 218 | if (this.isDragging) { |
| 219 | event.preventDefault(); |
| 220 | return; |
| 221 | } |
| 222 | |
| 223 | // If image isn't ready, ignore. |
| 224 | if (!this.currentImageUrl || !this.naturalWidth || !this.naturalHeight) return; |
| 225 | |
| 226 | event.preventDefault(); |
| 227 | |
| 228 | // deltaMode: 0=pixels, 1=lines, 2=pages |
| 229 | // Convert non-pixel deltas to an approximate pixel value. |
| 230 | let dx = event.deltaX || 0; |
| 231 | let dy = event.deltaY || 0; |
| 232 | if (event.deltaMode === 1) { |
| 233 | dx *= 16; |
| 234 | dy *= 16; |
| 235 | } else if (event.deltaMode === 2) { |
| 236 | dx *= 800; |
| 237 | dy *= 800; |
| 238 | } |
| 239 | |
| 240 | // Pan in the direction of scrolling. |
| 241 | this.panX -= dx; |
| 242 | this.panY -= dy; |
| 243 | this.updateImageTransform(); |
| 244 | }, |
| 245 | |
| 246 | endDrag() { |
| 247 | if (!this.isDragging) return; |
| 248 | this.isDragging = false; |
| 249 | this.activePointerId = null; |
| 250 | this.removeWindowDragListeners(); |
| 251 | }, |
| 252 | |
| 253 | addWindowDragListeners() { |
| 254 | this.removeWindowDragListeners(); |
| 255 | |
| 256 | this.windowDragMoveHandler = (e) => this.onDrag(e); |
| 257 | this.windowDragUpHandler = () => this.endDrag(); |
| 258 | |
| 259 | window.addEventListener('pointermove', this.windowDragMoveHandler, { passive: false }); |
| 260 | window.addEventListener('pointerup', this.windowDragUpHandler, { passive: false }); |
| 261 | window.addEventListener('pointercancel', this.windowDragUpHandler, { passive: false }); |
| 262 | }, |
| 263 | |
| 264 | removeWindowDragListeners() { |
| 265 | if (this.windowDragMoveHandler) { |
| 266 | window.removeEventListener('pointermove', this.windowDragMoveHandler); |
| 267 | this.windowDragMoveHandler = null; |
| 268 | } |
| 269 | if (this.windowDragUpHandler) { |
| 270 | window.removeEventListener('pointerup', this.windowDragUpHandler); |
| 271 | window.removeEventListener('pointercancel', this.windowDragUpHandler); |
| 272 | this.windowDragUpHandler = null; |
| 273 | } |
| 274 | }, |
| 275 | |
| 276 | clampPan(containerWidth, containerHeight, displayWidth, displayHeight) { |
| 277 | const margin = 25; |
| 278 | |
| 279 | const limitX = Math.max(0, (containerWidth + displayWidth) / 2 - margin); |
| 280 | const limitY = Math.max(0, (containerHeight + displayHeight) / 2 - margin); |
| 281 | |
| 282 | this.panX = Math.max(-limitX, Math.min(limitX, this.panX)); |
| 283 | this.panY = Math.max(-limitY, Math.min(limitY, this.panY)); |
| 284 | }, |
| 285 | |
| 286 | getDisplaySize(containerWidth, containerHeight) { |
| 287 | // Fit in both dimensions without upscaling |
| 288 | const scaleX = containerWidth / this.naturalWidth; |
| 289 | const scaleY = containerHeight / this.naturalHeight; |
| 290 | const fitScale = Math.min(scaleX, scaleY, 1); |
| 291 | const scale = fitScale * this.zoomLevel; |
| 292 | |
| 293 | return { |
| 294 | width: this.naturalWidth * scale, |
| 295 | height: this.naturalHeight * scale, |
| 296 | }; |
| 297 | }, |
| 298 | |
| 299 | // Zoom controls |
| 300 | zoomIn() { |
| 301 | this.zoomLevel = Math.min(this.zoomLevel * 1.25, 10); |
| 302 | this.updateImageTransform(); |
| 303 | }, |
| 304 | |
| 305 | zoomOut() { |
| 306 | this.zoomLevel = Math.max(this.zoomLevel / 1.25, 0.1); |
| 307 | this.updateImageTransform(); |
| 308 | }, |
| 309 | |
| 310 | resetZoom() { |
| 311 | this.zoomLevel = 1; |
| 312 | this.panX = 0; |
| 313 | this.panY = 0; |
| 314 | const img = document.querySelector('.modal-image'); |
| 315 | if (img) { |
| 316 | img.classList.remove('zoomed'); |
| 317 | img.style.width = ''; |
| 318 | img.style.height = ''; |
| 319 | img.style.transform = ''; |
| 320 | } |
| 321 | }, |
| 322 | |
| 323 | updateImageTransform() { |
| 324 | const img = document.querySelector('.modal-image'); |
| 325 | const wrapper = document.querySelector('.image-canvas'); |
| 326 | if (!img || !wrapper || !this.naturalWidth || !this.naturalHeight) return; |
| 327 | |
| 328 | const containerWidth = wrapper.clientWidth; |
| 329 | const containerHeight = wrapper.clientHeight; |
| 330 | |
| 331 | const displaySize = this.getDisplaySize(containerWidth, containerHeight); |
| 332 | this.clampPan(containerWidth, containerHeight, displaySize.width, displaySize.height); |
| 333 | |
| 334 | img.classList.add('zoomed'); |
| 335 | img.style.width = `${displaySize.width}px`; |
| 336 | img.style.height = `${displaySize.height}px`; |
| 337 | img.style.transform = `translate(${this.panX}px, ${this.panY}px)`; |
| 338 | }, |
| 339 | |
| 340 | // Utility methods |
| 341 | addTimestamp(url) { |
| 342 | try { |
| 343 | const urlObj = new URL(url, window.location.origin); |
| 344 | urlObj.searchParams.set("t", Date.now().toString()); |
| 345 | return urlObj.toString(); |
| 346 | } catch (e) { |
| 347 | // Fallback for invalid URLs |
| 348 | const separator = url.includes('?') ? '&' : '?'; |
| 349 | return `${url}${separator}t=${Date.now()}`; |
| 350 | } |
| 351 | }, |
| 352 | |
| 353 | extractImageName(url) { |
| 354 | try { |
| 355 | const urlObj = new URL(url, window.location.origin); |
| 356 | const pathname = urlObj.pathname; |
| 357 | return pathname.split("/").pop() || "Image"; |
| 358 | } catch (e) { |
| 359 | return url.split("/").pop() || "Image"; |
| 360 | } |
| 361 | }, |
| 362 | |
| 363 | // Optional: cleanup on store destruction |
| 364 | destroy() { |
| 365 | this.stopRefresh(); |
| 366 | this.resetState(); |
| 367 | }, |
| 368 | }; |
| 369 | |
| 370 | export const store = createStore("imageViewer", model); |
| 371 |