Files
lemonspace_app/components/canvas/nodes/image-node.tsx
Matthias 4e84e7f76f feat: enhance dashboard and canvas components with improved state management and resizing logic
- Added client mount state to the dashboard to prevent premature interactions before the component is fully loaded.
- Updated button disabling logic to ensure it reflects the component's readiness and user session state.
- Introduced zIndex handling in canvas placement context for better node layering.
- Enhanced asset and image nodes with improved resizing logic to maintain aspect ratios during adjustments.
- Refactored node components to streamline rendering and improve performance during dynamic updates.
2026-03-27 23:17:10 +01:00

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TypeScript
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"use client";
import {
useState,
useCallback,
useEffect,
useRef,
type ChangeEvent,
type DragEvent,
} from "react";
import { Handle, Position, type NodeProps, type Node } from "@xyflow/react";
import { useMutation } from "convex/react";
import { api } from "@/convex/_generated/api";
import type { Id } from "@/convex/_generated/dataModel";
import BaseNodeWrapper from "./base-node-wrapper";
import { toast } from "@/lib/toast";
import { msg } from "@/lib/toast-messages";
import { computeMediaNodeSize } from "@/lib/canvas-utils";
const ALLOWED_IMAGE_TYPES = new Set([
"image/png",
"image/jpeg",
"image/webp",
]);
const MAX_IMAGE_BYTES = 10 * 1024 * 1024;
type ImageNodeData = {
storageId?: string;
url?: string;
filename?: string;
mimeType?: string;
width?: number;
height?: number;
_status?: string;
_statusMessage?: string;
};
export type ImageNode = Node<ImageNodeData, "image">;
async function getImageDimensions(file: File): Promise<{ width: number; height: number }> {
return await new Promise((resolve, reject) => {
const objectUrl = URL.createObjectURL(file);
const image = new window.Image();
image.onload = () => {
const width = image.naturalWidth;
const height = image.naturalHeight;
URL.revokeObjectURL(objectUrl);
if (!width || !height) {
reject(new Error("Could not read image dimensions"));
return;
}
resolve({ width, height });
};
image.onerror = () => {
URL.revokeObjectURL(objectUrl);
reject(new Error("Could not decode image"));
};
image.src = objectUrl;
});
}
export default function ImageNode({
id,
data,
selected,
width,
height,
}: NodeProps<ImageNode>) {
const generateUploadUrl = useMutation(api.storage.generateUploadUrl);
const updateData = useMutation(api.nodes.updateData);
const resizeNode = useMutation(api.nodes.resize);
const fileInputRef = useRef<HTMLInputElement>(null);
const [isUploading, setIsUploading] = useState(false);
const [isDragOver, setIsDragOver] = useState(false);
const hasAutoSizedRef = useRef(false);
useEffect(() => {
if (typeof data.width !== "number" || typeof data.height !== "number") {
return;
}
if (hasAutoSizedRef.current) return;
const targetSize = computeMediaNodeSize("image", {
intrinsicWidth: data.width,
intrinsicHeight: data.height,
});
const currentWidth = typeof width === "number" ? width : 0;
const currentHeight = typeof height === "number" ? height : 0;
const hasMeasuredSize = currentWidth > 0 && currentHeight > 0;
if (!hasMeasuredSize) {
return;
}
const isAtTargetSize = currentWidth === targetSize.width && currentHeight === targetSize.height;
const isAtDefaultSeedSize = currentWidth === 280 && currentHeight === 200;
const shouldRunInitialAutoSize = isAtDefaultSeedSize && !isAtTargetSize;
if (!shouldRunInitialAutoSize) {
hasAutoSizedRef.current = true;
return;
}
hasAutoSizedRef.current = true;
void resizeNode({
nodeId: id as Id<"nodes">,
width: targetSize.width,
height: targetSize.height,
});
}, [data.height, data.width, height, id, resizeNode, width]);
const uploadFile = useCallback(
async (file: File) => {
if (!ALLOWED_IMAGE_TYPES.has(file.type)) {
const { title, desc } = msg.canvas.uploadFormatError(
file.type || file.name.split(".").pop() || "—",
);
toast.error(title, desc);
return;
}
if (file.size > MAX_IMAGE_BYTES) {
const { title, desc } = msg.canvas.uploadSizeError(
Math.round(MAX_IMAGE_BYTES / (1024 * 1024)),
);
toast.error(title, desc);
return;
}
setIsUploading(true);
try {
let dimensions: { width: number; height: number } | undefined;
try {
dimensions = await getImageDimensions(file);
} catch {
dimensions = undefined;
}
const uploadUrl = await generateUploadUrl();
const result = await fetch(uploadUrl, {
method: "POST",
headers: { "Content-Type": file.type },
body: file,
});
if (!result.ok) {
throw new Error("Upload failed");
}
const { storageId } = (await result.json()) as { storageId: string };
await updateData({
nodeId: id as Id<"nodes">,
data: {
storageId,
filename: file.name,
mimeType: file.type,
...(dimensions ? { width: dimensions.width, height: dimensions.height } : {}),
},
});
if (dimensions) {
const targetSize = computeMediaNodeSize("image", {
intrinsicWidth: dimensions.width,
intrinsicHeight: dimensions.height,
});
await resizeNode({
nodeId: id as Id<"nodes">,
width: targetSize.width,
height: targetSize.height,
});
}
toast.success(msg.canvas.imageUploaded.title);
} catch (err) {
console.error("Upload failed:", err);
toast.error(
msg.canvas.uploadFailed.title,
err instanceof Error ? err.message : undefined,
);
} finally {
setIsUploading(false);
}
},
[id, generateUploadUrl, resizeNode, updateData]
);
const handleClick = useCallback(() => {
if (!data.url && !isUploading) {
fileInputRef.current?.click();
}
}, [data.url, isUploading]);
const handleFileChange = useCallback(
(e: ChangeEvent<HTMLInputElement>) => {
const file = e.target.files?.[0];
if (file) uploadFile(file);
},
[uploadFile]
);
const handleDragOver = useCallback((e: DragEvent) => {
e.preventDefault();
e.stopPropagation();
if (e.dataTransfer.types.includes("Files")) {
setIsDragOver(true);
e.dataTransfer.dropEffect = "copy";
}
}, []);
const handleDragLeave = useCallback((e: DragEvent) => {
e.preventDefault();
e.stopPropagation();
setIsDragOver(false);
}, []);
const handleDrop = useCallback(
(e: DragEvent) => {
e.preventDefault();
e.stopPropagation();
setIsDragOver(false);
const file = e.dataTransfer.files?.[0];
if (file && file.type.startsWith("image/")) {
uploadFile(file);
}
},
[uploadFile]
);
const handleReplace = useCallback(() => {
fileInputRef.current?.click();
}, []);
const showFilename = Boolean(data.filename && data.url);
return (
<BaseNodeWrapper
nodeType="image"
selected={selected}
status={data._status}
>
<Handle
type="target"
position={Position.Left}
className="h-3! w-3! bg-primary! border-2! border-background!"
/>
<div
className={`grid h-full min-h-0 w-full grid-cols-1 gap-y-1 p-2 ${
showFilename
? "grid-rows-[auto_minmax(0,1fr)_auto]"
: "grid-rows-[auto_minmax(0,1fr)]"
}`}
>
<div className="flex items-center justify-between">
<div className="text-xs font-medium text-muted-foreground">🖼 Bild</div>
{data.url && (
<button
onClick={handleReplace}
className="nodrag text-xs text-muted-foreground transition-colors hover:text-foreground"
>
Ersetzen
</button>
)}
</div>
<div className="relative min-h-0 overflow-hidden rounded-lg bg-muted/30">
{isUploading ? (
<div className="flex h-full w-full items-center justify-center bg-muted">
<div className="flex flex-col items-center gap-2">
<div className="h-5 w-5 animate-spin rounded-full border-2 border-primary border-t-transparent" />
<span className="text-xs text-muted-foreground">Wird hochgeladen...</span>
</div>
</div>
) : data.url ? (
// eslint-disable-next-line @next/next/no-img-element -- Convex storage URL, volle Auflösung wie Asset-Node
<img
src={data.url}
alt={data.filename ?? "Bild"}
className="h-full w-full object-cover object-center"
draggable={false}
/>
) : (
<div
onClick={handleClick}
onDragOver={handleDragOver}
onDragLeave={handleDragLeave}
onDrop={handleDrop}
className={`
nodrag flex h-full w-full cursor-pointer flex-col items-center justify-center
border-2 border-dashed text-sm transition-colors
${
isDragOver
? "border-primary bg-primary/5 text-primary"
: "text-muted-foreground hover:border-primary/50 hover:text-foreground"
}
`}
>
<span className="mb-1 text-lg">📁</span>
<span>Klicken oder hierhin ziehen</span>
<span className="mt-0.5 text-xs">PNG, JPG, WebP</span>
</div>
)}
</div>
{showFilename ? (
<p className="min-h-0 truncate text-xs text-muted-foreground">{data.filename}</p>
) : null}
</div>
<input
ref={fileInputRef}
type="file"
accept="image/png,image/jpeg,image/webp"
onChange={handleFileChange}
className="hidden"
/>
<Handle
type="source"
position={Position.Right}
className="h-3! w-3! bg-primary! border-2! border-background!"
/>
</BaseNodeWrapper>
);
}