a tool for shared writing and social publishing
handle dropping images onto canvas
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components/Blocks/useHandleCanvasDrop.ts
+233
components/Blocks/useHandleCanvasDrop.ts
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import { useCallback } from "react";
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import { useReplicache, useEntity } from "src/replicache";
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import { useEntitySetContext } from "components/EntitySetProvider";
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import { v7 } from "uuid";
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import { supabaseBrowserClient } from "supabase/browserClient";
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import { localImages } from "src/utils/addImage";
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import { rgbaToThumbHash, thumbHashToDataURL } from "thumbhash";
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// Helper function to load image dimensions and thumbhash
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const processImage = async (
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file: File,
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): Promise<{
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width: number;
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height: number;
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thumbhash: string;
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}> => {
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// Load image to get dimensions
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const img = new Image();
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const url = URL.createObjectURL(file);
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const dimensions = await new Promise<{ width: number; height: number }>(
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(resolve, reject) => {
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img.onload = () => {
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resolve({ width: img.width, height: img.height });
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};
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img.onerror = reject;
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img.src = url;
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},
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);
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// Generate thumbhash
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const arrayBuffer = await file.arrayBuffer();
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const blob = new Blob([arrayBuffer], { type: file.type });
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const imageBitmap = await createImageBitmap(blob);
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const canvas = document.createElement("canvas");
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const context = canvas.getContext("2d") as CanvasRenderingContext2D;
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const maxDimension = 100;
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let width = imageBitmap.width;
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let height = imageBitmap.height;
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if (width > height) {
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if (width > maxDimension) {
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height *= maxDimension / width;
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width = maxDimension;
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}
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} else {
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if (height > maxDimension) {
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width *= maxDimension / height;
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height = maxDimension;
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}
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}
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canvas.width = width;
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canvas.height = height;
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context.drawImage(imageBitmap, 0, 0, width, height);
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const imageData = context.getImageData(0, 0, width, height);
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const thumbhash = thumbHashToDataURL(
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rgbaToThumbHash(imageData.width, imageData.height, imageData.data),
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);
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URL.revokeObjectURL(url);
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return {
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width: dimensions.width,
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height: dimensions.height,
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thumbhash,
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};
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};
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export const useHandleCanvasDrop = (entityID: string) => {
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let { rep } = useReplicache();
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let entity_set = useEntitySetContext();
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let blocks = useEntity(entityID, "canvas/block");
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return useCallback(
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async (e: React.DragEvent) => {
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e.preventDefault();
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e.stopPropagation();
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if (!rep) return;
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const files = e.dataTransfer.files;
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if (!files || files.length === 0) return;
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// Filter for image files only
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const imageFiles = Array.from(files).filter((file) =>
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file.type.startsWith("image/"),
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);
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if (imageFiles.length === 0) return;
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const parentRect = e.currentTarget.getBoundingClientRect();
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const dropX = Math.max(e.clientX - parentRect.left, 0);
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const dropY = Math.max(e.clientY - parentRect.top, 0);
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const SPACING = 0;
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const DEFAULT_WIDTH = 360;
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// Process all images to get dimensions and thumbhashes
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const processedImages = await Promise.all(
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imageFiles.map((file) => processImage(file)),
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);
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// Calculate grid dimensions based on image count
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const COLUMNS = Math.ceil(Math.sqrt(imageFiles.length));
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// Calculate the width and height for each column and row
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const colWidths: number[] = [];
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const rowHeights: number[] = [];
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for (let i = 0; i < imageFiles.length; i++) {
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const col = i % COLUMNS;
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const row = Math.floor(i / COLUMNS);
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const dims = processedImages[i];
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// Scale image to fit within DEFAULT_WIDTH while maintaining aspect ratio
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const scale = DEFAULT_WIDTH / dims.width;
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const scaledWidth = DEFAULT_WIDTH;
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const scaledHeight = dims.height * scale;
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// Track max width for each column and max height for each row
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colWidths[col] = Math.max(colWidths[col] || 0, scaledWidth);
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rowHeights[row] = Math.max(rowHeights[row] || 0, scaledHeight);
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}
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const client = supabaseBrowserClient();
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const cache = await caches.open("minilink-user-assets");
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// Calculate positions and prepare data for all images
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const imageBlocks = imageFiles.map((file, index) => {
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const entity = v7();
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const fileID = v7();
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const row = Math.floor(index / COLUMNS);
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const col = index % COLUMNS;
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// Calculate x position by summing all previous column widths
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let x = dropX;
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for (let c = 0; c < col; c++) {
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x += colWidths[c] + SPACING;
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}
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// Calculate y position by summing all previous row heights
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let y = dropY;
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for (let r = 0; r < row; r++) {
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y += rowHeights[r] + SPACING;
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}
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const url = client.storage
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.from("minilink-user-assets")
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.getPublicUrl(fileID).data.publicUrl;
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return {
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file,
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entity,
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fileID,
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url,
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position: { x, y },
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dimensions: processedImages[index],
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};
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});
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// Create all blocks with image facts
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for (const block of imageBlocks) {
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// Add to cache for immediate display
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await cache.put(
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new URL(block.url + "?local"),
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new Response(block.file, {
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headers: {
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"Content-Type": block.file.type,
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"Content-Length": block.file.size.toString(),
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},
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}),
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);
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localImages.set(block.url, true);
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// Create canvas block
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await rep.mutate.addCanvasBlock({
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newEntityID: block.entity,
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parent: entityID,
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position: block.position,
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factID: v7(),
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type: "image",
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permission_set: entity_set.set,
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});
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// Add image fact with local version for immediate display
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if (navigator.serviceWorker) {
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await rep.mutate.assertFact({
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entity: block.entity,
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attribute: "block/image",
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data: {
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fallback: block.dimensions.thumbhash,
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type: "image",
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local: rep.clientID,
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src: block.url,
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height: block.dimensions.height,
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width: block.dimensions.width,
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},
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});
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}
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}
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// Upload all files to storage in parallel
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await Promise.all(
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imageBlocks.map(async (block) => {
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await client.storage
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.from("minilink-user-assets")
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.upload(block.fileID, block.file, {
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cacheControl: "public, max-age=31560000, immutable",
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});
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// Update fact with final version
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await rep.mutate.assertFact({
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entity: block.entity,
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attribute: "block/image",
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data: {
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fallback: block.dimensions.thumbhash,
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type: "image",
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src: block.url,
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height: block.dimensions.height,
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width: block.dimensions.width,
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},
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});
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}),
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);
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return true;
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},
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[rep, entityID, entity_set.set, blocks],
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);
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};
+14
components/Canvas.tsx
+14
components/Canvas.tsx
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import { TooltipButton } from "./Buttons";
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import { useBlockKeyboardHandlers } from "./Blocks/useBlockKeyboardHandlers";
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import { AddSmall } from "./Icons/AddSmall";
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import { useHandleCanvasDrop } from "./Blocks/useHandleCanvasDrop";
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export function Canvas(props: { entityID: string; preview?: boolean }) {
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let entity_set = useEntitySetContext();
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let { rep } = useReplicache();
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let entity_set = useEntitySetContext();
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let height = Math.max(...blocks.map((f) => f.data.position.y), 0);
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let handleDrop = useHandleCanvasDrop(props.entityID);
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return (
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<div
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onClick={async (e) => {
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);
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}
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}}
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onDragOver={
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!props.preview && entity_set.permissions.write
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? (e) => {
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e.preventDefault();
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e.stopPropagation();
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}
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: undefined
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}
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onDrop={
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!props.preview && entity_set.permissions.write ? handleDrop : undefined
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}
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style={{
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minHeight: height + 512,
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contain: "size layout paint",