720 lines
18 KiB
TypeScript
720 lines
18 KiB
TypeScript
import React from 'react';
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import * as fabric from 'fabric';
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import {
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CANVAS_HEIGHT,
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CANVAS_WIDTH,
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LayoutElement,
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clamp,
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LayoutElementType,
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} from './schema';
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type DesignerCanvasProps = {
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elements: LayoutElement[];
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selectedId: string | null;
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onSelect: (id: string | null) => void;
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onChange: (id: string, patch: Partial<LayoutElement>) => void;
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background: string;
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gradient: { angle?: number; stops?: string[] } | null;
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accent: string;
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text: string;
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secondary: string;
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badge: string;
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qrCodeDataUrl: string | null;
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logoDataUrl: string | null;
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scale: number;
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layoutKey?: string;
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readOnly?: boolean;
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};
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type FabricObjectWithId = fabric.Object & { elementId?: string };
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const DEFAULT_MIN_SCALE = 0.15;
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const DEFAULT_MAX_SCALE = 0.85;
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export function DesignerCanvas({
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elements,
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selectedId,
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onSelect,
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onChange,
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background,
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gradient,
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accent,
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text,
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secondary,
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badge,
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qrCodeDataUrl,
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logoDataUrl,
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scale,
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layoutKey,
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readOnly = false,
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}: DesignerCanvasProps): React.JSX.Element {
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const canvasElementRef = React.useRef<HTMLCanvasElement | null>(null);
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const fabricCanvasRef = React.useRef<fabric.Canvas | null>(null);
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const containerRef = React.useRef<HTMLDivElement | null>(null);
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const disposeTokenRef = React.useRef(0);
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const pendingDisposeRef = React.useRef<number | null>(null);
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const pendingTimeoutRef = React.useRef<number | null>(null);
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const destroyCanvas = React.useCallback((canvas: fabric.Canvas | null) => {
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if (!canvas) {
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return;
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}
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if (fabricCanvasRef.current === canvas) {
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fabricCanvasRef.current = null;
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}
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const upperEl = canvas.upperCanvasEl as (HTMLElement & Record<string, unknown>) | undefined;
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if (upperEl) {
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if (upperEl.__canvas === canvas) {
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delete upperEl.__canvas;
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}
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if (upperEl.__fabricCanvas === canvas) {
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delete upperEl.__fabricCanvas;
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}
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}
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const lowerEl = canvas.lowerCanvasEl as (HTMLElement & Record<string, unknown>) | undefined;
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if (lowerEl) {
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if (lowerEl.__canvas === canvas) {
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delete lowerEl.__canvas;
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}
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if (lowerEl.__fabricCanvas === canvas) {
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delete lowerEl.__fabricCanvas;
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}
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}
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const targetEl = canvas.getElement() as (HTMLCanvasElement & Record<string, unknown>) | undefined;
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if (targetEl) {
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if (targetEl.__canvas === canvas) {
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delete targetEl.__canvas;
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}
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if (targetEl.__fabricCanvas === canvas) {
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delete targetEl.__fabricCanvas;
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}
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}
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const wrapper = (canvas as unknown as { wrapperEl?: (HTMLElement & Record<string, unknown>) }).wrapperEl;
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if (wrapper) {
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if (wrapper.__fabricCanvas === canvas) {
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delete wrapper.__fabricCanvas;
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}
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if (Object.getOwnPropertyDescriptor(wrapper, '__canvas')) {
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try {
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delete wrapper.__canvas;
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} catch (error) {
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console.warn('[Invites][Fabric] failed to delete wrapper __canvas', error);
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}
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}
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delete wrapper.dataset?.fabric;
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}
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if ((window as unknown as Record<string, unknown>).__inviteCanvas === canvas) {
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delete (window as unknown as Record<string, unknown>).__inviteCanvas;
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}
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try {
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canvas.dispose();
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} catch (error) {
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console.warn('[Invites][Fabric] dispose failed', error);
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}
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}, []);
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React.useLayoutEffect(() => {
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const element = canvasElementRef.current;
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if (!element) {
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console.warn('[Invites][Fabric] canvas element missing');
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return undefined;
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}
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if (pendingTimeoutRef.current !== null) {
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window.clearTimeout(pendingTimeoutRef.current);
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pendingTimeoutRef.current = null;
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pendingDisposeRef.current = null;
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}
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destroyCanvas(fabricCanvasRef.current);
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console.warn('[Invites][Fabric] initializing canvas element');
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const canvas = new fabric.Canvas(element, {
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selection: !readOnly,
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preserveObjectStacking: true,
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perPixelTargetFind: true,
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});
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fabricCanvasRef.current = canvas;
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const disposeToken = ++disposeTokenRef.current;
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(window as unknown as Record<string, unknown>).__inviteCanvas = canvas;
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(element as unknown as { __fabricCanvas?: fabric.Canvas }).__fabricCanvas = canvas;
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if (containerRef.current) {
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const wrapper = containerRef.current as (HTMLElement & Record<string, unknown>);
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wrapper.__fabricCanvas = canvas;
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Object.defineProperty(wrapper, '__canvas', {
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configurable: true,
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enumerable: false,
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writable: true,
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value: canvas,
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});
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wrapper.dataset.fabric = 'ready';
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}
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return () => {
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const timeoutId = window.setTimeout(() => {
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if (disposeTokenRef.current !== disposeToken) {
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return;
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}
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destroyCanvas(canvas);
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pendingTimeoutRef.current = null;
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pendingDisposeRef.current = null;
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}, 0);
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pendingTimeoutRef.current = timeoutId;
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pendingDisposeRef.current = disposeToken;
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};
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}, [destroyCanvas, readOnly]);
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React.useEffect(() => {
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const canvas = fabricCanvasRef.current;
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if (!canvas) {
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return;
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}
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canvas.selection = !readOnly;
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canvas.forEachObject((object) => {
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object.set({
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selectable: !readOnly,
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hoverCursor: readOnly ? 'default' : 'move',
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});
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});
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}, [readOnly]);
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React.useEffect(() => {
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const canvas = fabricCanvasRef.current;
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if (!canvas) {
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return;
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}
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const handleSelection = () => {
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if (readOnly) {
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return;
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}
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const active = canvas.getActiveObject() as FabricObjectWithId | null;
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if (!active || typeof active.elementId !== 'string') {
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onSelect(null);
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return;
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}
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onSelect(active.elementId);
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};
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const handleSelectionCleared = () => {
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if (readOnly) {
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return;
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}
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onSelect(null);
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};
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const handleObjectModified = (event: fabric.IEvent<fabric.Object>) => {
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if (readOnly) {
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return;
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}
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const target = event.target as FabricObjectWithId | undefined;
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if (!target || typeof target.elementId !== 'string') {
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return;
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}
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const elementId = target.elementId;
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const bounds = target.getBoundingRect(true, true);
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const nextPatch: Partial<LayoutElement> = {
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x: clamp(Math.round(bounds.left ?? 0), 0, CANVAS_WIDTH),
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y: clamp(Math.round(bounds.top ?? 0), 0, CANVAS_HEIGHT),
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width: clamp(Math.round(bounds.width ?? target.width ?? 0), 40, CANVAS_WIDTH),
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height: clamp(Math.round(bounds.height ?? target.height ?? 0), 40, CANVAS_HEIGHT),
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};
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target.set({
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scaleX: 1,
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scaleY: 1,
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left: nextPatch.x,
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top: nextPatch.y,
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width: nextPatch.width,
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height: nextPatch.height,
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});
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onChange(elementId, nextPatch);
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canvas.requestRenderAll();
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};
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canvas.on('selection:created', handleSelection);
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canvas.on('selection:updated', handleSelection);
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canvas.on('selection:cleared', handleSelectionCleared);
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canvas.on('object:modified', handleObjectModified);
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return () => {
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canvas.off('selection:created', handleSelection);
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canvas.off('selection:updated', handleSelection);
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canvas.off('selection:cleared', handleSelectionCleared);
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canvas.off('object:modified', handleObjectModified);
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};
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}, [onChange, onSelect, readOnly]);
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React.useEffect(() => {
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const canvas = fabricCanvasRef.current;
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if (!canvas) {
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return;
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}
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renderFabricLayout(canvas, {
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elements,
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accentColor: accent,
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textColor: text,
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secondaryColor: secondary,
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badgeColor: badge,
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qrCodeDataUrl,
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logoDataUrl,
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backgroundColor: background,
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backgroundGradient: gradient,
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readOnly,
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selectedId,
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}).catch((error) => {
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console.error('[Fabric] Failed to render layout', error);
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});
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}, [
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elements,
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accent,
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text,
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secondary,
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badge,
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qrCodeDataUrl,
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logoDataUrl,
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background,
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gradient,
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selectedId,
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readOnly,
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]);
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React.useEffect(() => {
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const canvas = fabricCanvasRef.current;
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if (!canvas) {
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return;
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}
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canvas.setZoom(scale);
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canvas.setDimensions(
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{
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width: CANVAS_WIDTH * scale,
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height: CANVAS_HEIGHT * scale,
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},
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{ cssOnly: true },
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);
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canvas.requestRenderAll();
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}, [scale]);
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return (
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<div ref={containerRef} className="relative inline-block max-w-full">
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<canvas
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ref={canvasElementRef}
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width={CANVAS_WIDTH}
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height={CANVAS_HEIGHT}
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style={{ display: 'block' }}
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/>
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</div>
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);
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}
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export type FabricRenderOptions = {
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elements: LayoutElement[];
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accentColor: string;
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textColor: string;
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secondaryColor: string;
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badgeColor: string;
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qrCodeDataUrl: string | null;
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logoDataUrl: string | null;
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backgroundColor: string;
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backgroundGradient: { angle?: number; stops?: string[] } | null;
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readOnly: boolean;
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selectedId?: string | null;
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};
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export async function renderFabricLayout(
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canvas: fabric.Canvas,
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options: FabricRenderOptions,
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): Promise<void> {
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const {
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elements,
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accentColor,
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textColor,
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secondaryColor,
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badgeColor,
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qrCodeDataUrl,
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logoDataUrl,
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backgroundColor,
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backgroundGradient,
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readOnly,
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selectedId,
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} = options;
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canvas.discardActiveObject();
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canvas.getObjects().forEach((object) => canvas.remove(object));
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applyBackground(canvas, backgroundColor, backgroundGradient);
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console.debug('[Invites][Fabric] render', {
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elementCount: elements.length,
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backgroundColor,
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hasGradient: Boolean(backgroundGradient),
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readOnly,
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});
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const objectPromises = elements.map((element) =>
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createFabricObject({
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element,
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accentColor,
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textColor,
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secondaryColor,
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badgeColor,
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qrCodeDataUrl,
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logoDataUrl,
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readOnly,
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}),
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);
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const fabricObjects = await Promise.all(objectPromises);
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fabricObjects.forEach((object) => {
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if (!object) {
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console.debug('[Invites][Fabric] Skip null fabric object');
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return;
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}
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if (readOnly) {
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object.set({
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selectable: false,
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hoverCursor: 'default',
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});
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}
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try {
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canvas.add(object);
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if (typeof object.setCoords === 'function') {
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object.setCoords();
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}
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const bounds = object.getBoundingRect(true, true);
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console.warn('[Invites][Fabric] added object', {
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elementId: (object as FabricObjectWithId).elementId,
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left: bounds.left,
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top: bounds.top,
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width: bounds.width,
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height: bounds.height,
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});
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} catch (error) {
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console.error('[Invites][Fabric] failed to add object', error);
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}
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});
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console.warn('[Invites][Fabric] object count', canvas.getObjects().length);
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if (!readOnly && selectedId) {
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const match = canvas
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.getObjects()
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.find((object) => (object as FabricObjectWithId).elementId === selectedId);
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if (match) {
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canvas.setActiveObject(match);
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}
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}
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canvas.renderAll();
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}
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export function applyBackground(
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canvas: fabric.Canvas,
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color: string,
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gradient: { angle?: number; stops?: string[] } | null,
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): void {
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let background: string | fabric.Gradient = color;
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if (gradient?.stops?.length) {
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const angle = ((gradient.angle ?? 180) * Math.PI) / 180;
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const halfWidth = CANVAS_WIDTH / 2;
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const halfHeight = CANVAS_HEIGHT / 2;
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const x = Math.cos(angle);
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const y = Math.sin(angle);
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background = new fabric.Gradient({
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type: 'linear',
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coords: {
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x1: halfWidth - x * halfWidth,
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y1: halfHeight - y * halfHeight,
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x2: halfWidth + x * halfWidth,
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y2: halfHeight + y * halfHeight,
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},
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colorStops: gradient.stops.map((stop, index) => ({
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offset: gradient.stops.length === 1 ? 0 : index / (gradient.stops.length - 1),
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color: stop,
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})),
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});
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}
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const canvasWithBackgroundFn = canvas as fabric.Canvas & {
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setBackgroundColor?: (value: string | fabric.Gradient, callback?: () => void) => void;
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};
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if (typeof canvasWithBackgroundFn.setBackgroundColor === 'function') {
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canvasWithBackgroundFn.setBackgroundColor(background, () => canvas.requestRenderAll());
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} else {
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canvas.backgroundColor = background;
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canvas.requestRenderAll();
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}
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}
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export type FabricObjectFactoryContext = {
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element: LayoutElement;
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accentColor: string;
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textColor: string;
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secondaryColor: string;
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badgeColor: string;
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qrCodeDataUrl: string | null;
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logoDataUrl: string | null;
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readOnly: boolean;
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};
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export async function createFabricObject({
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element,
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accentColor,
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textColor,
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secondaryColor,
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badgeColor,
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qrCodeDataUrl,
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logoDataUrl,
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readOnly,
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}: FabricObjectFactoryContext): Promise<fabric.Object | null> {
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console.debug('[Invites][Fabric] create element', {
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id: element.id,
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type: element.type,
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width: element.width,
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height: element.height,
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content: element.content,
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});
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const baseConfig = {
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left: element.x,
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top: element.y,
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elementId: element.id,
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selectable: !readOnly,
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hasBorders: !readOnly,
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hasControls: !readOnly,
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} as FabricObjectWithId;
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switch (element.type) {
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case 'headline':
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case 'subtitle':
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case 'description':
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case 'text':
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return new fabric.Textbox(element.content ?? '', {
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...baseConfig,
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width: element.width,
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height: element.height,
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fontSize: element.fontSize ?? 26,
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fill: textColor,
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textAlign: mapTextAlign(element.align),
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});
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case 'link':
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return new fabric.Textbox(element.content ?? '', {
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...baseConfig,
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width: element.width,
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height: element.height,
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fontSize: element.fontSize ?? 24,
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fill: accentColor,
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underline: true,
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textAlign: mapTextAlign(element.align),
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});
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case 'badge':
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return createTextBadge({
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baseConfig,
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text: element.content ?? '',
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width: element.width,
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height: element.height,
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backgroundColor: badgeColor,
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textColor: '#ffffff',
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fontSize: element.fontSize ?? 22,
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});
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case 'cta':
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return createTextBadge({
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baseConfig,
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text: element.content ?? '',
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width: element.width,
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height: element.height,
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backgroundColor: accentColor,
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textColor: '#ffffff',
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fontSize: element.fontSize ?? 24,
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cornerRadius: 18,
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});
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case 'logo':
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if (logoDataUrl) {
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return loadImageObject(logoDataUrl, element, baseConfig, {
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objectFit: 'contain',
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});
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}
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return null;
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case 'qr':
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if (qrCodeDataUrl) {
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return loadImageObject(qrCodeDataUrl, element, baseConfig, {
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shadow: 'rgba(15,23,42,0.25)',
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});
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}
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return new fabric.Rect({
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...baseConfig,
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width: element.width,
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height: element.height,
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fill: secondaryColor,
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rx: 20,
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ry: 20,
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});
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default:
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return new fabric.Textbox(element.content ?? '', {
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...baseConfig,
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width: element.width,
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height: element.height,
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fontSize: element.fontSize ?? 24,
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fill: secondaryColor,
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textAlign: mapTextAlign(element.align),
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});
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}
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}
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export function createTextBadge({
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baseConfig,
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text,
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width,
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height,
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backgroundColor,
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textColor,
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fontSize,
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cornerRadius = 12,
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}: {
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baseConfig: FabricObjectWithId;
|
|
text: string;
|
|
width: number;
|
|
height: number;
|
|
backgroundColor: string;
|
|
textColor: string;
|
|
fontSize: number;
|
|
cornerRadius?: number;
|
|
}): fabric.Group {
|
|
const rect = new fabric.Rect({
|
|
width,
|
|
height,
|
|
rx: cornerRadius,
|
|
ry: cornerRadius,
|
|
fill: backgroundColor,
|
|
left: 0,
|
|
top: 0,
|
|
selectable: false,
|
|
evented: false,
|
|
});
|
|
|
|
const label = new fabric.Textbox(text, {
|
|
width: width - 32,
|
|
left: 16,
|
|
top: height / 2,
|
|
fontSize,
|
|
fill: textColor,
|
|
originY: 'center',
|
|
textAlign: 'center',
|
|
selectable: false,
|
|
evented: false,
|
|
});
|
|
|
|
return new fabric.Group([rect, label], {
|
|
...baseConfig,
|
|
width,
|
|
height,
|
|
originX: 'left',
|
|
originY: 'top',
|
|
}) as fabric.Group & FabricObjectWithId;
|
|
}
|
|
|
|
export async function loadImageObject(
|
|
source: string,
|
|
element: LayoutElement,
|
|
baseConfig: FabricObjectWithId,
|
|
options?: { objectFit?: 'contain' | 'cover'; shadow?: string },
|
|
): Promise<fabric.Object | null> {
|
|
return new Promise((resolve) => {
|
|
fabric.Image.fromURL(
|
|
source,
|
|
(image) => {
|
|
if (!image) {
|
|
resolve(null);
|
|
return;
|
|
}
|
|
|
|
const scaleX = element.width / (image.width ?? element.width);
|
|
const scaleY = element.height / (image.height ?? element.height);
|
|
|
|
image.set({
|
|
...baseConfig,
|
|
width: element.width,
|
|
height: element.height,
|
|
scaleX,
|
|
scaleY,
|
|
});
|
|
|
|
if (options?.shadow) {
|
|
image.set('shadow', options.shadow);
|
|
}
|
|
|
|
if (options?.objectFit === 'contain') {
|
|
const ratio = Math.min(scaleX, scaleY);
|
|
image.set({
|
|
scaleX: ratio,
|
|
scaleY: ratio,
|
|
left: element.x + (element.width - (image.width ?? 0) * ratio) / 2,
|
|
top: element.y + (element.height - (image.height ?? 0) * ratio) / 2,
|
|
});
|
|
}
|
|
|
|
resolve(image);
|
|
},
|
|
{ crossOrigin: 'anonymous' },
|
|
);
|
|
});
|
|
}
|
|
|
|
export function mapTextAlign(align?: LayoutElement['align']): 'left' | 'center' | 'right' {
|
|
switch (align) {
|
|
case 'center':
|
|
return 'center';
|
|
case 'right':
|
|
return 'right';
|
|
default:
|
|
return 'left';
|
|
}
|
|
}
|
|
|
|
export function CanvasScaleControl({
|
|
scale,
|
|
min = DEFAULT_MIN_SCALE,
|
|
max = DEFAULT_MAX_SCALE,
|
|
onChange,
|
|
}: {
|
|
scale: number;
|
|
min?: number;
|
|
max?: number;
|
|
onChange: (value: number) => void;
|
|
}): React.JSX.Element {
|
|
return (
|
|
<div className="flex items-center gap-3 rounded-full border border-[var(--tenant-border-strong)] bg-[var(--tenant-layer)] px-4 py-2 text-xs">
|
|
<span className="font-medium text-muted-foreground">Zoom</span>
|
|
<input
|
|
type="range"
|
|
min={min}
|
|
max={max}
|
|
step={0.025}
|
|
value={scale}
|
|
onChange={(event) => onChange(Number(event.target.value))}
|
|
className="h-1 w-32 overflow-hidden rounded-full"
|
|
/>
|
|
<span className="tabular-nums text-muted-foreground">{Math.round(scale * 100)}%</span>
|
|
</div>
|
|
);
|
|
}
|