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useCallback,
useEffect,
useMemo,
useRef,
useState,
type CSSProperties,
type PointerEvent as ReactPointerEvent,
type ReactNode,
} from 'react';
import { createPortal } from 'react-dom';
import { Check, Code2, Copy, Eye, Maximize2, Minus, Plus, RotateCcw, X } from 'lucide-react';
import mermaidLib, { type MermaidConfig } from 'mermaid';
import type { CustomRendererProps } from 'streamdown';
interface MermaidBlockProps extends CustomRendererProps {
config?: MermaidConfig;
}
type MermaidViewMode = 'preview' | 'source';
type MermaidTransform = {
x: number;
y: number;
scale: number;
};
type MermaidDragState = {
pointerId: number;
startX: number;
startY: number;
originX: number;
originY: number;
};
interface MermaidInteractiveDiagramProps {
className: string;
testId: string;
svg: string;
transformStyle: CSSProperties;
controls: ReactNode;
onWheel: (event: WheelEvent) => void;
onPointerDown: (event: ReactPointerEvent<HTMLDivElement>) => void;
onPointerMove: (event: ReactPointerEvent<HTMLDivElement>) => void;
onPointerEnd: (event: ReactPointerEvent<HTMLDivElement>, releasePointer?: boolean) => void;
}
let mermaidPreviewId = 0;
const MIN_MERMAID_SCALE = 0.25;
const MAX_MERMAID_SCALE = 4;
const MERMAID_ZOOM_STEP = 1.2;
const TOUCHPAD_PAN_DELTA_LIMIT = 40;
const DEFAULT_MERMAID_TRANSFORM: MermaidTransform = { x: 0, y: 0, scale: 1 };
function clampMermaidScale(scale: number) {
return Math.min(MAX_MERMAID_SCALE, Math.max(MIN_MERMAID_SCALE, Number(scale.toFixed(3))));
}
function formatTransformNumber(value: number) {
return Number(value.toFixed(2)).toString();
}
async function writeClipboardText(text: string) {
Eif (navigator.clipboard?.writeText) {
await navigator.clipboard.writeText(text);
return;
}
const textarea = document.createElement('textarea');
textarea.value = text;
textarea.setAttribute('readonly', '');
textarea.style.position = 'fixed';
textarea.style.opacity = '0';
textarea.style.pointerEvents = 'none';
document.body.appendChild(textarea);
textarea.select();
const didCopy = document.execCommand('copy');
document.body.removeChild(textarea);
if (!didCopy) throw new Error('Clipboard copy failed.');
}
function MermaidInteractiveDiagram({
className,
testId,
svg,
transformStyle,
controls,
onWheel,
onPointerDown,
onPointerMove,
onPointerEnd,
}: MermaidInteractiveDiagramProps) {
const surfaceRef = useRef<HTMLDivElement>(null);
useEffect(() => {
const surface = surfaceRef.current;
Iif (!surface) return undefined;
surface.addEventListener('wheel', onWheel, { passive: false });
return () => surface.removeEventListener('wheel', onWheel);
}, [onWheel]);
return (
<div
ref={surfaceRef}
className={className}
data-testid={testId}
onPointerDown={onPointerDown}
onPointerMove={onPointerMove}
onPointerUp={onPointerEnd}
onPointerCancel={onPointerEnd}
onLostPointerCapture={(event) => onPointerEnd(event, false)}
>
<div
className="mermaid-pan-zoom-content"
data-testid="mermaid-pan-zoom-content"
style={transformStyle}
dangerouslySetInnerHTML={{ __html: svg }}
/>
{controls}
</div>
);
}
export function MermaidBlock({ code, config }: MermaidBlockProps) {
const [viewMode, setViewMode] = useState<MermaidViewMode>('preview');
const [isFullscreen, setIsFullscreen] = useState(false);
const [copied, setCopied] = useState(false);
const [diagramTransform, setDiagramTransform] = useState<MermaidTransform>(DEFAULT_MERMAID_TRANSFORM);
const [svg, setSvg] = useState('');
const [error, setError] = useState('');
const copiedTimer = useRef<number | undefined>(undefined);
const dragState = useRef<MermaidDragState | null>(null);
const normalizedCode = useMemo(() => code.trim(), [code]);
const diagramTransformStyle = useMemo(
() => ({
transform: `translate(${formatTransformNumber(diagramTransform.x)}px, ${formatTransformNumber(diagramTransform.y)}px) scale(${formatTransformNumber(diagramTransform.scale)})`,
}),
[diagramTransform],
);
useEffect(() => {
let cancelled = false;
async function renderDiagram() {
Iif (!normalizedCode) {
setSvg('');
setError('');
return;
}
try {
setError('');
mermaidLib.initialize({
startOnLoad: false,
securityLevel: 'strict',
fontFamily: 'monospace',
suppressErrorRendering: true,
...config,
});
const id = `vibe-mermaid-${++mermaidPreviewId}`;
const result = await mermaidLib.render(id, normalizedCode);
Eif (!cancelled) setSvg(result.svg);
} catch (err) {
if (!cancelled) {
setSvg('');
setError(err instanceof Error ? err.message : 'Unable to render Mermaid diagram.');
}
}
}
renderDiagram();
return () => {
cancelled = true;
};
}, [config, normalizedCode]);
useEffect(() => {
Iif (isFullscreen && !svg) setIsFullscreen(false);
}, [isFullscreen, svg]);
useEffect(() => {
dragState.current = null;
setDiagramTransform({ ...DEFAULT_MERMAID_TRANSFORM });
}, [svg]);
useEffect(() => {
return () => {
if (copiedTimer.current !== undefined) window.clearTimeout(copiedTimer.current);
};
}, []);
useEffect(() => {
if (!isFullscreen || typeof document === 'undefined') return undefined;
const previousOverflow = document.body.style.overflow;
const handleKeyDown = (event: globalThis.KeyboardEvent) => {
if (event.key === 'Escape') setIsFullscreen(false);
};
document.body.style.overflow = 'hidden';
document.addEventListener('keydown', handleKeyDown);
return () => {
document.body.style.overflow = previousOverflow;
document.removeEventListener('keydown', handleKeyDown);
};
}, [isFullscreen]);
const openFullscreen = () => {
Iif (!svg) return;
setIsFullscreen(true);
};
const copyMermaidCode = async () => {
Iif (!code) return;
try {
await writeClipboardText(code);
setCopied(true);
Iif (copiedTimer.current !== undefined) window.clearTimeout(copiedTimer.current);
copiedTimer.current = window.setTimeout(() => setCopied(false), 1500);
} catch {
setCopied(false);
}
};
const zoomMermaidDiagram = useCallback((factor: number) => {
setDiagramTransform((current) => ({
...current,
scale: clampMermaidScale(current.scale * factor),
}));
}, []);
const resetMermaidDiagram = () => {
dragState.current = null;
setDiagramTransform({ ...DEFAULT_MERMAID_TRANSFORM });
};
const handleDiagramWheel = useCallback((event: WheelEvent) => {
Iif (!svg) return;
event.preventDefault();
event.stopPropagation();
Iif ((event.target as HTMLElement | null)?.closest('.mermaid-pan-controls')) return;
const shouldPan =
!event.ctrlKey &&
!event.metaKey &&
event.deltaMode === 0 &&
(event.deltaX !== 0 || Math.abs(event.deltaY) < TOUCHPAD_PAN_DELTA_LIMIT);
if (shouldPan) {
setDiagramTransform((current) => ({
...current,
x: current.x - event.deltaX,
y: current.y - event.deltaY,
}));
return;
}
zoomMermaidDiagram(event.deltaY <= 0 ? MERMAID_ZOOM_STEP : 1 / MERMAID_ZOOM_STEP);
}, [svg, zoomMermaidDiagram]);
const handleDiagramPointerDown = (event: ReactPointerEvent<HTMLDivElement>) => {
Iif (!svg || event.button !== 0) return;
Iif ((event.target as HTMLElement).closest('button')) return;
event.preventDefault();
dragState.current = {
pointerId: event.pointerId,
startX: event.clientX,
startY: event.clientY,
originX: diagramTransform.x,
originY: diagramTransform.y,
};
event.currentTarget.classList.add('mermaid-pan-surface--panning');
event.currentTarget.setPointerCapture?.(event.pointerId);
};
const handleDiagramPointerMove = (event: ReactPointerEvent<HTMLDivElement>) => {
const state = dragState.current;
Iif (!state || state.pointerId !== event.pointerId) return;
event.preventDefault();
setDiagramTransform((current) => ({
...current,
x: state.originX + event.clientX - state.startX,
y: state.originY + event.clientY - state.startY,
}));
};
const endDiagramPan = (event: ReactPointerEvent<HTMLDivElement>, releasePointer = true) => {
const state = dragState.current;
Iif (!state || state.pointerId !== event.pointerId) return;
dragState.current = null;
event.currentTarget.classList.remove('mermaid-pan-surface--panning');
Eif (releasePointer) {
try {
event.currentTarget.releasePointerCapture?.(event.pointerId);
} catch {
// The pointer may already be released after browser-native cancellation.
}
}
};
const renderZoomControls = () => (
<div
className="mermaid-pan-controls"
aria-label="Mermaid 缩放控制"
onPointerDown={(event) => event.stopPropagation()}
onWheel={(event) => event.stopPropagation()}
>
<button type="button" className="mermaid-pan-control" title="放大 Mermaid 图" onClick={() => zoomMermaidDiagram(MERMAID_ZOOM_STEP)}>
<Plus size={14} />
</button>
<button type="button" className="mermaid-pan-control" title="缩小 Mermaid 图" onClick={() => zoomMermaidDiagram(1 / MERMAID_ZOOM_STEP)}>
<Minus size={14} />
</button>
<button type="button" className="mermaid-pan-control" title="重置 Mermaid 图视图" onClick={resetMermaidDiagram}>
<RotateCcw size={14} />
</button>
</div>
);
const renderInteractiveDiagram = (className: string, testId: string) => (
<MermaidInteractiveDiagram
className={className}
testId={testId}
svg={svg}
transformStyle={diagramTransformStyle}
controls={renderZoomControls()}
onWheel={handleDiagramWheel}
onPointerDown={handleDiagramPointerDown}
onPointerMove={handleDiagramPointerMove}
onPointerEnd={endDiagramPan}
/>
);
const renderPreviewBody = () => {
Iif (error) return <div className="mermaid-preview-error">Mermaid render error</div>;
if (!svg) return <div className="mermaid-preview-loading">Rendering...</div>;
return renderInteractiveDiagram('mermaid-preview-surface', 'mermaid-preview');
};
return (
<div className="mermaid-preview-block" data-streamdown="mermaid-block">
<div className="mermaid-preview-header">
<span className="mermaid-preview-label">mermaid</span>
</div>
<div className="mermaid-preview-actions-layer">
<div className="mermaid-preview-actions" aria-label="Mermaid 视图控制" data-streamdown="code-block-actions">
<button
type="button"
className={`mermaid-preview-action ${viewMode === 'preview' ? 'mermaid-preview-action--active' : ''}`}
title="查看 Mermaid 预览"
aria-pressed={viewMode === 'preview'}
onClick={() => setViewMode('preview')}
>
<Eye size={14} />
</button>
<button
type="button"
className={`mermaid-preview-action ${viewMode === 'source' ? 'mermaid-preview-action--active' : ''}`}
title="查看 Mermaid 源码"
aria-pressed={viewMode === 'source'}
onClick={() => setViewMode('source')}
>
<Code2 size={14} />
</button>
<button
type="button"
className="mermaid-preview-action"
title={copied ? '已复制 Mermaid 源码' : '复制 Mermaid 源码'}
disabled={!code}
onClick={copyMermaidCode}
>
{copied ? <Check size={14} /> : <Copy size={14} />}
</button>
<button
type="button"
className="mermaid-preview-action"
title="全屏查看 Mermaid 图"
disabled={!svg}
onClick={openFullscreen}
>
<Maximize2 size={14} />
</button>
</div>
</div>
{viewMode === 'preview' ? (
renderPreviewBody()
) : (
<pre className="mermaid-preview-source">
<code>{code}</code>
</pre>
)}
{isFullscreen && svg && typeof document !== 'undefined'
? createPortal(
<div
className="mermaid-fullscreen-backdrop"
role="dialog"
aria-modal="true"
aria-label="Mermaid 全屏预览"
onMouseDown={(event) => {
if (event.target === event.currentTarget) setIsFullscreen(false);
}}
>
<div className="mermaid-fullscreen-toolbar">
<span className="mermaid-preview-label">mermaid</span>
<button
type="button"
className="mermaid-preview-action mermaid-fullscreen-close"
title="关闭全屏预览"
onClick={() => setIsFullscreen(false)}
>
<X size={16} />
</button>
</div>
{renderInteractiveDiagram('mermaid-fullscreen-surface', 'mermaid-fullscreen-preview')}
</div>,
document.body,
)
: null}
</div>
);
}
|