BookStack Code Mirror - hacks/blob - content/mermaid-viewer/head.html

   1 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.css"
   2     integrity="sha512-Evv84Mr4kqVGRNSgIGL/F/aIDqQb7xQ2vcrdIwxfjThSH8CSR7PBEakCr51Ck+w+/U6swU2Im1vVX0SVk9ABhg=="
   3     crossorigin="anonymous" referrerpolicy="no-referrer" />
   4
   5 <script src="https://cdnjs.cloudflare.com/ajax/libs/mermaid/11.7.0/mermaid.min.js"
   6     integrity="sha512-ecc+vlmmc1f51s2l/AeIC552wULnv9Q8bYJ4FbODxsL6jGrFoLaKnGkN5JUZNH6LBjkAYy9Q4fKqyTuFUIvvFA=="
   7     crossorigin="anonymous" referrerpolicy="no-referrer"></script>
   8 <script type="module">
   9     // Detect if BookStack's dark mode is enabled
  10     const isDarkMode = document.documentElement.classList.contains('dark-mode');
  11
  12     // Initialize Mermaid.js, dynamically setting the theme based on BookStack's mode
  13     mermaid.initialize({
  14         startOnLoad: false,
  15         securityLevel: 'loose',
  16         theme: isDarkMode ? 'dark' : 'default'
  17     });
  18
  19     // Zoom Level Configuration
  20     const ZOOM_LEVEL_MIN = 0.5;
  21     const ZOOM_LEVEL_MAX = 2.0;
  22     const ZOOM_LEVEL_INCREMENT = 0.1;
  23     const DEFAULT_ZOOM_SCALE = 1.0;
  24
  25     const DRAG_THRESHOLD_PIXELS = 3;
  26     const ZOOM_ANIMATION_CLASS_TIMEOUT_MS = 200;
  27
  28     const CSS_CLASSES = {
  29         CONTAINER: 'mermaid-container',
  30         VIEWPORT: 'mermaid-viewport',
  31         CONTENT: 'mermaid-content',
  32         DIAGRAM: 'mermaid-diagram',
  33         CONTROLS: 'mermaid-controls',
  34         ZOOM_CONTROLS: 'mermaid-zoom-controls',
  35         INTERACTION_ENABLED: 'interaction-enabled',
  36         DRAGGING: 'dragging',
  37         ZOOMING: 'zooming',
  38         LOCK_ICON: 'fa fa-lock',
  39         UNLOCK_ICON: 'fa fa-unlock',
  40         INTERACTIVE_HOVER: 'interactive-hover', // Class for 'grab' cursor state
  41         INTERACTIVE_PAN: 'interactive-pan',     // Class for 'grabbing' cursor state
  42         BUTTON_BASE: 'mermaid-viewer-button-base' // Base class for all viewer buttons
  43     };
  44
  45     class InteractiveMermaidViewer {
  46         constructor(container, mermaidCode) {
  47             this.container = container;
  48             this.mermaidCode = mermaidCode;
  49             this.scale = 1.0;
  50             this.translateX = 0;
  51             this.translateY = 0;
  52             this.isDragging = false;
  53             this.dragStarted = false;
  54             this.startX = 0;
  55             this.startY = 0;
  56
  57             const numDecimalPlaces = (ZOOM_LEVEL_INCREMENT.toString().split('.')[1] || '').length;
  58             this.zoomLevels = Array.from(
  59                 { length: Math.round((ZOOM_LEVEL_MAX - ZOOM_LEVEL_MIN) / ZOOM_LEVEL_INCREMENT) + 1 },
  60                 (_, i) => parseFloat((ZOOM_LEVEL_MIN + i * ZOOM_LEVEL_INCREMENT).toFixed(numDecimalPlaces))
  61             );
  62
  63             this.currentZoomIndex = this.zoomLevels.findIndex(level => Math.abs(level - DEFAULT_ZOOM_SCALE) < 1e-9);
  64             if (this.currentZoomIndex === -1) {
  65                 this.currentZoomIndex = Math.floor(this.zoomLevels.length / 2);
  66             }
  67             this.interactionEnabled = false;
  68             this.initialContentOffset = { x: 0, y: 0 };
  69
  70             // Cache DOM elements
  71             this.toggleInteractionBtn = null;
  72             this.copyCodeBtn = null;
  73             this.zoomInBtn = null;
  74             this.zoomOutBtn = null;
  75             this.zoomResetBtn = null;
  76
  77             // Bind event handlers for proper addition and removal
  78             this.boundMouseMoveHandler = this.handleMouseMove.bind(this);
  79             this.boundMouseUpHandler = this.handleMouseUp.bind(this);
  80             this.boundToggleInteraction = this.toggleInteraction.bind(this);
  81             this.boundCopyCode = this.copyCode.bind(this);
  82             this.boundZoomIn = () => {
  83                 const { clientX, clientY } = this._getViewportCenterClientCoords();
  84                 this.zoom(1, clientX, clientY);
  85             };
  86             this.boundZoomOut = () => {
  87                 const { clientX, clientY } = this._getViewportCenterClientCoords();
  88                 this.zoom(-1, clientX, clientY);
  89             };
  90             this.boundResetZoom = this.resetZoom.bind(this);
  91             this.boundHandleWheel = this.handleWheel.bind(this);
  92             this.boundHandleMouseDown = this.handleMouseDown.bind(this);
  93             this.boundPreventDefault = e => e.preventDefault();
  94             this.boundPreventSelect = e => { if (this.isDragging || this.interactionEnabled) e.preventDefault(); };
  95
  96             this.setupViewer();
  97             this.setupEventListeners();
  98         }
  99
 100         /**
 101          * Creates the DOM structure for the viewer programmatically.
 102          * This is safer and more maintainable than using innerHTML with a large template string.
 103          */
 104         setupViewer() {
 105             const createButton = (title, iconClass, ...extraClasses) => {
 106                 const button = document.createElement('div');
 107                 button.className = `${CSS_CLASSES.BUTTON_BASE} ${extraClasses.join(' ')}`;
 108                 button.title = title;
 109                 const icon = document.createElement('i');
 110                 icon.className = iconClass;
 111                 icon.setAttribute('aria-hidden', 'true');
 112                 button.append(icon);
 113                 return button;
 114             };
 115
 116             const controls = document.createElement('div');
 117             controls.className = CSS_CLASSES.CONTROLS;
 118             this.toggleInteractionBtn = createButton('Toggle interaction', CSS_CLASSES.LOCK_ICON, 'mermaid-btn', 'toggle-interaction');
 119             this.copyCodeBtn = createButton('Copy code', 'fa fa-copy', 'mermaid-btn');
 120             controls.append(this.toggleInteractionBtn, this.copyCodeBtn);
 121
 122             const zoomControls = document.createElement('div');
 123             zoomControls.className = CSS_CLASSES.ZOOM_CONTROLS;
 124             this.zoomInBtn = createButton('Zoom in', 'fa fa-search-plus', 'mermaid-zoom-btn', 'zoom-in');
 125             this.zoomOutBtn = createButton('Zoom out', 'fa fa-search-minus', 'mermaid-zoom-btn', 'zoom-out');
 126             this.zoomResetBtn = createButton('Reset', 'fa fa-refresh', 'mermaid-zoom-btn', 'zoom-reset');
 127             zoomControls.append(this.zoomInBtn, this.zoomOutBtn, this.zoomResetBtn);
 128
 129             this.diagram = document.createElement('div');
 130             this.diagram.className = CSS_CLASSES.DIAGRAM;
 131             // Use textContent for security, preventing any potential HTML injection.
 132             // Mermaid will parse the text content safely.
 133             this.diagram.textContent = this.mermaidCode;
 134
 135             this.content = document.createElement('div');
 136             this.content.className = CSS_CLASSES.CONTENT;
 137             this.content.append(this.diagram);
 138
 139             this.viewport = document.createElement('div');
 140             this.viewport.className = CSS_CLASSES.VIEWPORT;
 141             this.viewport.append(this.content);
 142
 143             // Clear the container and append the new structure
 144             this.container.innerHTML = '';
 145             this.container.append(controls, zoomControls, this.viewport);
 146
 147             // Function to render the diagram and perform post-render setup
 148             const renderAndSetup = () => {
 149                 mermaid.run({ nodes: [this.diagram] }).then(() => {
 150                     this.adjustContainerHeight();
 151                     this.calculateInitialOffset();
 152                     this.centerDiagram();
 153                 }).catch(error => {
 154                     console.error("Mermaid rendering error for diagram:", this.mermaidCode, error);
 155                     this.diagram.innerHTML = `<p style="color: red; padding: 10px;">Error rendering diagram. Check console.</p>`;
 156                 });
 157             };
 158
 159             // Check if Font Awesome is loaded before rendering
 160             // This checks for the 'Font Awesome 6 Free' font family, which is common.
 161             // Adjust if your Font Awesome version uses a different family name for its core icons.
 162             if (document.fonts && typeof document.fonts.check === 'function' && document.fonts.check('1em "Font Awesome 6 Free"')) { // Check if Font Awesome is immediately available
 163                 renderAndSetup();
 164             } else if (document.fonts && document.fonts.ready) { // Simplified check for document.fonts.ready
 165                 document.fonts.ready.then(renderAndSetup).catch(err => {
 166                     renderAndSetup(); // Proceed with rendering even if font check fails after timeout/error
 167                 });
 168             } else {
 169                 renderAndSetup();
 170             }
 171         }
 172
 173         adjustContainerHeight() {
 174             const svgElement = this.content.querySelector('svg');
 175             if (svgElement) {
 176                 // Ensure the viewport takes up the height of the rendered SVG
 177                 this.viewport.style.height = '100%';
 178             }
 179         }
 180
 181         calculateInitialOffset() {
 182             const originalTransform = this.content.style.transform;
 183             this.content.style.transform = '';
 184             const contentRect = this.content.getBoundingClientRect();
 185             const viewportRect = this.viewport.getBoundingClientRect();
 186             this.initialContentOffset.x = contentRect.left - viewportRect.left;
 187             this.initialContentOffset.y = contentRect.top - viewportRect.top;
 188             this.content.style.transform = originalTransform;
 189         }
 190
 191         _getViewportCenterClientCoords() {
 192             const viewportRect = this.viewport.getBoundingClientRect();
 193             return {
 194                 clientX: viewportRect.left + viewportRect.width / 2,
 195                 clientY: viewportRect.top + viewportRect.height / 2,
 196             };
 197         }
 198
 199         setupEventListeners() {
 200             this.toggleInteractionBtn.addEventListener('click', this.boundToggleInteraction);
 201             this.copyCodeBtn.addEventListener('click', this.boundCopyCode);
 202             this.zoomInBtn.addEventListener('click', this.boundZoomIn);
 203             this.zoomOutBtn.addEventListener('click', this.boundZoomOut);
 204             this.zoomResetBtn.addEventListener('click', this.boundResetZoom);
 205
 206             this.viewport.addEventListener('wheel', this.boundHandleWheel, { passive: false });
 207             this.viewport.addEventListener('mousedown', this.boundHandleMouseDown);
 208
 209             // Listen on document for mousemove to handle dragging outside viewport
 210             document.addEventListener('mousemove', this.boundMouseMoveHandler);
 211             // Listen on window for mouseup to ensure drag ends even if mouse is released outside
 212             window.addEventListener('mouseup', this.boundMouseUpHandler, true); // Use capture phase
 213
 214             this.viewport.addEventListener('contextmenu', this.boundPreventDefault);
 215             this.viewport.addEventListener('selectstart', this.boundPreventSelect);
 216         }
 217
 218         toggleInteraction() {
 219             this.interactionEnabled = !this.interactionEnabled;
 220             const icon = this.toggleInteractionBtn.querySelector('i');
 221             this.toggleInteractionBtn.setAttribute('aria-pressed', this.interactionEnabled.toString());
 222
 223             if (this.interactionEnabled) {
 224                 icon.className = CSS_CLASSES.UNLOCK_ICON;
 225                 this.toggleInteractionBtn.title = 'Disable manual interaction';
 226                 this.viewport.classList.add(CSS_CLASSES.INTERACTION_ENABLED);
 227                 this.viewport.classList.add(CSS_CLASSES.INTERACTIVE_HOVER); // Set grab cursor state
 228                 this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_PAN); // Ensure pan cursor state is off
 229             } else {
 230                 icon.className = CSS_CLASSES.LOCK_ICON;
 231                 this.toggleInteractionBtn.title = 'Enable manual interaction';
 232                 this.viewport.classList.remove(CSS_CLASSES.INTERACTION_ENABLED);
 233                 this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_HOVER);
 234                 this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_PAN);
 235                 this.isDragging = false; // Ensure dragging stops if interaction is disabled mid-drag
 236                 this.dragStarted = false;
 237                 this.viewport.classList.remove(CSS_CLASSES.DRAGGING);
 238             }
 239         }
 240
 241         updateTransform() {
 242             this.content.style.transform = `translate(${this.translateX}px, ${this.translateY}px) scale(${this.scale})`;
 243         }
 244
 245         handleWheel(e) {
 246             if (!this.interactionEnabled) return;
 247             // Prevent default browser scroll/zoom behavior when wheeling over the diagram
 248             e.preventDefault();
 249             this.content.classList.add(CSS_CLASSES.ZOOMING);
 250             const clientX = e.clientX;
 251             const clientY = e.clientY;
 252             if (e.deltaY > 0) this.zoom(-1, clientX, clientY);
 253             else this.zoom(1, clientX, clientY);
 254             setTimeout(() => this.content.classList.remove(CSS_CLASSES.ZOOMING), ZOOM_ANIMATION_CLASS_TIMEOUT_MS);
 255         }
 256
 257         handleMouseDown(e) {
 258             if (!this.interactionEnabled || e.button !== 0) return;
 259             e.preventDefault();
 260             this.isDragging = true;
 261             this.dragStarted = false;
 262             this.startX = e.clientX;
 263             this.startY = e.clientY;
 264             this.dragBaseTranslateX = this.translateX;
 265             this.dragBaseTranslateY = this.translateY;
 266             this.viewport.classList.add(CSS_CLASSES.DRAGGING);
 267             this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_HOVER);
 268             this.viewport.classList.add(CSS_CLASSES.INTERACTIVE_PAN);
 269             this.content.classList.remove(CSS_CLASSES.ZOOMING);
 270         }
 271
 272         handleMouseMove(e) {
 273             if (!this.isDragging) return;
 274             // e.preventDefault() is called only after dragStarted is true to allow clicks if threshold isn't met.
 275             const deltaX = e.clientX - this.startX;
 276             const deltaY = e.clientY - this.startY;
 277             if (!this.dragStarted && (Math.abs(deltaX) > DRAG_THRESHOLD_PIXELS || Math.abs(deltaY) > DRAG_THRESHOLD_PIXELS)) {
 278                 this.dragStarted = true;
 279             }
 280             if (this.dragStarted) {
 281                 e.preventDefault(); // Prevent text selection, etc., only when drag has truly started
 282                 this.translateX = this.dragBaseTranslateX + deltaX;
 283                 this.translateY = this.dragBaseTranslateY + deltaY;
 284                 this.updateTransform();
 285             }
 286         }
 287
 288         handleMouseUp() {
 289             if (this.isDragging) {
 290                 this.isDragging = false;
 291                 this.dragStarted = false;
 292                 this.viewport.classList.remove(CSS_CLASSES.DRAGGING);
 293                 this.viewport.classList.remove(CSS_CLASSES.INTERACTIVE_PAN);
 294                 if (this.interactionEnabled) { // Revert to grab cursor if interaction is still enabled
 295                     this.viewport.classList.add(CSS_CLASSES.INTERACTIVE_HOVER);
 296                 }
 297             }
 298             this.content.style.transform = `translate(${this.translateX}px, ${this.translateY}px) scale(${this.scale})`;
 299         }
 300
 301         centerDiagram() {
 302             const svgElement = this.content.querySelector('svg');
 303             if (svgElement) {
 304                 const viewportRect = this.viewport.getBoundingClientRect();
 305                 const svgIntrinsicWidth = svgElement.viewBox.baseVal.width || svgElement.clientWidth;
 306                 const svgIntrinsicHeight = svgElement.viewBox.baseVal.height || svgElement.clientHeight;
 307
 308                 const targetContentLeftRelativeToViewport = (viewportRect.width - (svgIntrinsicWidth * this.scale)) / 2;
 309                 const targetContentTopRelativeToViewport = (viewportRect.height - (svgIntrinsicHeight * this.scale)) / 2;
 310
 311                 this.translateX = targetContentLeftRelativeToViewport - this.initialContentOffset.x;
 312                 this.translateY = targetContentTopRelativeToViewport - this.initialContentOffset.y;
 313
 314                 // Initial centering constraints; may need adjustment for very large diagrams.
 315                 this.translateX = Math.max(0, this.translateX);
 316                 this.translateY = Math.max(0, this.translateY);
 317
 318                 this.updateTransform();
 319             }
 320         }
 321
 322         zoom(direction, clientX, clientY) {
 323             this.content.classList.add(CSS_CLASSES.ZOOMING);
 324             const oldScale = this.scale;
 325             let newZoomIndex = this.currentZoomIndex + direction;
 326
 327             if (newZoomIndex >= 0 && newZoomIndex < this.zoomLevels.length) {
 328                 this.currentZoomIndex = newZoomIndex;
 329                 const newScale = this.zoomLevels[this.currentZoomIndex];
 330
 331                 const viewportRect = this.viewport.getBoundingClientRect();
 332                 const pointXInContent = (clientX - viewportRect.left - this.translateX) / oldScale;
 333                 const pointYInContent = (clientY - viewportRect.top - this.translateY) / oldScale;
 334
 335                 this.translateX = (clientX - viewportRect.left) - (pointXInContent * newScale);
 336                 this.translateY = (clientY - viewportRect.top) - (pointYInContent * newScale);
 337                 this.scale = newScale;
 338                 this.updateTransform();
 339             }
 340             setTimeout(() => this.content.classList.remove(CSS_CLASSES.ZOOMING), ZOOM_ANIMATION_CLASS_TIMEOUT_MS);
 341         }
 342
 343         resetZoom() {
 344             this.content.classList.add(CSS_CLASSES.ZOOMING);
 345             this.currentZoomIndex = this.zoomLevels.findIndex(level => Math.abs(level - DEFAULT_ZOOM_SCALE) < 1e-9);
 346             if (this.currentZoomIndex === -1) { // Fallback if default not exactly in levels
 347                 this.currentZoomIndex = Math.floor(this.zoomLevels.length / 2);
 348             }
 349             this.scale = this.zoomLevels[this.currentZoomIndex];
 350             // Use requestAnimationFrame to ensure layout is stable before centering
 351             requestAnimationFrame(() => {
 352                 this.centerDiagram();
 353                 setTimeout(() => this.content.classList.remove(CSS_CLASSES.ZOOMING), ZOOM_ANIMATION_CLASS_TIMEOUT_MS);
 354             });
 355         }
 356
 357         async copyCode() {
 358             try {
 359                 await navigator.clipboard.writeText(this.mermaidCode);
 360                 this.showNotification('Copied!');
 361             } catch (_error) {
 362                 // Fallback for older browsers or if clipboard API fails
 363                 const textArea = document.createElement('textarea');
 364                 textArea.value = this.mermaidCode;
 365                 // Style to make it invisible
 366                 textArea.style.position = 'fixed';
 367                 textArea.style.top = '-9999px';
 368                 textArea.style.left = '-9999px';
 369                 document.body.appendChild(textArea);
 370                 textArea.select();
 371                 try {
 372                     document.execCommand('copy');
 373                     this.showNotification('Copied!');
 374                 } catch (copyError) {
 375                     console.error('Fallback copy failed:', copyError);
 376                     this.showNotification('Copy failed.', true); // Error
 377                 }
 378                 document.body.removeChild(textArea);
 379             }
 380         }
 381
 382         showNotification(message, isError = false) {
 383             if (window.$events) {
 384                 const eventName = isError ? 'error' : 'success';
 385                 window.$events.emit(eventName, message);
 386             } else {
 387                 // Fallback for if the event system is not available
 388                 console.warn('BookStack event system not found, falling back to console log for notification.');
 389                 if (isError) {
 390                     console.error(message);
 391                 } else {
 392                     console.log(message);
 393                 }
 394             }
 395         }
 396
 397         destroy() {
 398             // Remove event listeners specific to this instance
 399             this.toggleInteractionBtn.removeEventListener('click', this.boundToggleInteraction);
 400             this.copyCodeBtn.removeEventListener('click', this.boundCopyCode);
 401             this.zoomInBtn.removeEventListener('click', this.boundZoomIn);
 402             this.zoomOutBtn.removeEventListener('click', this.boundZoomOut);
 403             this.zoomResetBtn.removeEventListener('click', this.boundResetZoom);
 404
 405             this.viewport.removeEventListener('wheel', this.boundHandleWheel, { passive: false });
 406             this.viewport.removeEventListener('mousedown', this.boundHandleMouseDown);
 407             this.viewport.removeEventListener('contextmenu', this.boundPreventDefault);
 408             this.viewport.removeEventListener('selectstart', this.boundPreventSelect);
 409
 410             document.removeEventListener('mousemove', this.boundMouseMoveHandler);
 411             window.removeEventListener('mouseup', this.boundMouseUpHandler, true);
 412
 413             this.container.innerHTML = ''; // Clear the container's content
 414         }
 415     }
 416
 417     const mermaidViewers = [];
 418     function initializeMermaidViewers() {
 419         // Adjust the selector if your CMS wraps mermaid code blocks differently
 420         const codeBlocks = document.querySelectorAll('pre code.language-mermaid');
 421         for (const codeBlock of codeBlocks) {
 422             // Ensure we don't re-initialize if this script runs multiple times or content is dynamic
 423             if (codeBlock.dataset.mermaidViewerInitialized) continue;
 424
 425             const mermaidCode = codeBlock.textContent || codeBlock.innerHTML; // textContent is usually better
 426             const container = document.createElement('div');
 427             container.className = CSS_CLASSES.CONTAINER;
 428
 429             const replaceTarget = (codeBlock.nodeName === 'CODE') ? codeBlock.parentElement : codeBlock;
 430
 431             // Check if replaceTarget is already a mermaid-container (e.g. from previous init)
 432             if (replaceTarget.classList.contains(CSS_CLASSES.CONTAINER)) continue;
 433
 434             replaceTarget.after(container);
 435             replaceTarget.remove(); // Remove the original <pre> or <pre><code> block
 436
 437             const viewer = new InteractiveMermaidViewer(container, mermaidCode);
 438             mermaidViewers.push(viewer);
 439             codeBlock.dataset.mermaidViewerInitialized = 'true'; // Mark as initialized
 440         }
 441     }
 442
 443     // Initialize on DOMContentLoaded
 444     if (document.readyState === 'loading') {
 445         document.addEventListener('DOMContentLoaded', initializeMermaidViewers);
 446     } else {
 447         // DOMContentLoaded has already fired
 448         initializeMermaidViewers();
 449     }
 450
 451     // Re-center diagrams on window load, as images/fonts inside SVG might affect size
 452     window.addEventListener('load', () => {
 453         mermaidViewers.forEach(viewer => {
 454             // Delay slightly to ensure mermaid rendering is fully complete and dimensions are stable
 455             setTimeout(() => viewer.centerDiagram(), 100);
 456         });
 457     });
 458
 459     // Optional: If your CMS dynamically adds content, you might need a way to re-run initialization
 460     // For example, using a MutationObserver or a custom event.
 461     // document.addEventListener('myCMSContentLoaded', () => initializeMermaidViewers());
 462
 463 </script>
 464 <style>
 465     /* Use BookStack's CSS variables for seamless theme integration */
 466     .mermaid-container {
 467         background: var(--color-bg-alt);
 468         border: 1px solid #d0d7de;
 469         border-radius: 6px;
 470         position: relative;
 471         margin: 20px 0;
 472     }
 473
 474     .mermaid-viewport {
 475         height: 100%;
 476         /* This will now be 100% of the dynamically set container height */
 477         overflow: hidden;
 478         /* Keep this for panning/zooming when content exceeds viewport */
 479         cursor: auto;
 480         /* Default to normal system cursor */
 481     }
 482
 483     /* Ensure viewport cursor is auto when locked, even if active.
 484            The text selection (I-beam) cursor will still appear over selectable text within .mermaid-content. */
 485     .mermaid-viewport:not(.interaction-enabled):active {
 486         cursor: auto;
 487     }
 488
 489     /* Set 'grab' cursor when the viewport has the 'interactive-hover' class. */
 490     .mermaid-viewport.interactive-hover {
 491         cursor: grab;
 492     }
 493
 494     /* Set 'grabbing' cursor when the viewport has the 'interactive-pan' class. */
 495     .mermaid-viewport.interactive-pan {
 496         cursor: grabbing !important;
 497     }
 498
 499     .mermaid-content {
 500         transform-origin: 0 0;
 501         /* Allow text selection by default (when interaction is locked) */
 502         user-select: auto;
 503         /* or 'text' */
 504         will-change: transform;
 505     }
 506
 507     /* Disable text selection ONLY when interaction is enabled on the viewport */
 508     .mermaid-viewport.interaction-enabled .mermaid-content {
 509         user-select: none;
 510     }
 511
 512     /* SVG elements inherit cursor from the viewport when interaction is enabled. */
 513     .mermaid-viewport.interaction-enabled .mermaid-content svg,
 514     .mermaid-viewport.interaction-enabled .mermaid-content svg * {
 515         cursor: inherit !important;
 516         /* Force inheritance from the viewport's cursor */
 517     }
 518
 519     .mermaid-content.zooming {
 520         transition: transform 0.2s ease;
 521     }
 522
 523     .mermaid-controls {
 524         position: absolute;
 525         top: 10px;
 526         right: 10px;
 527         display: flex;
 528         gap: 5px;
 529         z-index: 10;
 530     }
 531
 532     .mermaid-viewer-button-base {
 533         border: 1px solid #d0d7de;
 534         border-radius: 6px;
 535         cursor: pointer;
 536         display: flex;
 537         align-items: center;
 538         justify-content: center;
 539         user-select: none;
 540         background: var(--color-bg);
 541         width: 32px;
 542         height: 32px;
 543         color: var(--color-text);
 544     }
 545
 546     .mermaid-viewer-button-base:hover {
 547         background: #f6f8fa;
 548     }
 549
 550     .dark-mode .mermaid-viewer-button-base:hover {
 551         background: var(--color-bg-alt);
 552     }
 553
 554     /* Override for pure white icons in dark mode */
 555     .dark-mode .mermaid-viewer-button-base {
 556         color: #fff;
 557     }
 558
 559     .mermaid-zoom-controls {
 560         position: absolute;
 561         bottom: 10px;
 562         left: 10px;
 563         display: flex;
 564         flex-direction: column;
 565         gap: 5px;
 566         z-index: 10;
 567     }
 568 </style>