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useEffect,
useCallback,
useMemo,
useRef,
useState,
createContext,
useContext,
} from "react";
import {
ReactFlow,
type ReactFlowInstance,
Controls,
Background,
BackgroundVariant,
useNodesState,
useEdgesState,
Handle,
Position,
MarkerType,
type NodeChange,
type NodeProps,
type NodeTypes,
type Node,
type Edge,
} from "@xyflow/react";
import "@xyflow/react/dist/style.css";
import {
buildScaffoldGraphElements,
type MajorConceptLike,
type SubconceptLike,
type EdgeLike,
} from "main/utils/layout";
import type { ConceptContentDTO } from "main/types/conceptGraph";
import { useStaffTools } from "main/utils/useStaffTools";
import LevelLegend from "main/components/Scaffold/LevelLegend";
import ResetButton from "main/components/Scaffold/ResetButton";
// This is a parallel, database-driven version of ConceptGraph.tsx: instead of
// importing majorConcepts/prereqEdgeData/positions/conceptContent from the
// hardcoded frontend/src/main/data files, it takes them as props so it can
// render a concept graph fetched from the backend for any course. The
// original ConceptGraph.tsx (used by LegacyHomePage.tsx) is left completely
// untouched; once this version is proven out, one of the two can be retired.
const cardKeyMap: Record<string, keyof ConceptContentDTO> = {
Description: "descriptionHtml",
Example: "exampleHtml",
"PrairieLearn Practice": "practiceUrl",
};
interface SavedDetailCard {
cardType: string;
itemLabel: string;
conceptId: string;
conceptColor: string;
posX: number;
posY: number;
}
interface ScaffoldConceptGraphProps {
majorConcepts: MajorConceptLike[];
positions: Record<string, { x: number; y: number }>;
conceptContent: Record<string, ConceptContentDTO>;
prereqEdgeData: EdgeLike[];
highlightedIds: Set<string>;
highlightedSubconcepts: Map<string, Set<string>>;
onConceptClick: (id: string) => void;
starredIds: Set<string>;
onStarClick: (id: string) => void;
onReset: () => void;
onDetailAdded?: (card: {
cardType: string;
itemLabel: string;
conceptId: string;
conceptColor: string;
posX: number;
posY: number;
}) => void;
onDetailDeleted?: (cardType: string, itemLabel: string) => void;
restoredDetailCards?: SavedDetailCard[];
onDetailMoved?: (
cardType: string,
itemLabel: string,
posX: number,
posY: number,
) => void;
// Called when the user finishes dragging a top-level concept node. The position is a
// private, per-user override (see ConceptGraphPage) until an instructor's course-wide
// reset recomputes the shared, canonical position.
onMajorMoved?: (name: string, posX: number, posY: number) => void;
// Called when an author (with editing enabled) drag-and-drops a card's
// subconcepts into a new order. orderedSubconceptIds is the complete new
// ordering of the parent's subconcept ids; the page persists it.
onSubconceptsReordered?: (
parentConceptId: number,
orderedSubconceptIds: number[],
) => void;
onConceptDoubleClick?: (conceptId: string) => void;
onSubconceptDoubleClick?: (
parentConceptId: string,
subconceptId: string,
) => void;
onAddSubconcept?: (parentConceptId: string) => void;
masteredSubconcepts: Set<string>;
onSubconceptMastered: (sub: string) => void;
onPaneClick?: () => void;
}
function toPastel(hex: string, strength: number = 0.35): string {
const r = parseInt(hex.slice(1, 3), 16);
const g = parseInt(hex.slice(3, 5), 16);
const b = parseInt(hex.slice(5, 7), 16);
const pr = Math.round(r * strength + 255 * (1 - strength));
const pg = Math.round(g * strength + 255 * (1 - strength));
const pb = Math.round(b * strength + 255 * (1 - strength));
return `rgb(${pr}, ${pg}, ${pb})`;
}
const DeleteDetailContext = createContext<(id: string) => void>(() => {});
const ConceptContentContext = createContext<Record<string, ConceptContentDTO>>(
{},
);
// Lets a MajorNode report that the author drag-and-dropped its subconcepts into
// a new order (nodeId is the parent's React Flow node id, i.e. its numeric
// concept id as a string). Provided by ScaffoldConceptGraph, which updates the node's
// data and notifies the page so it can persist the order.
const SubconceptReorderContext = createContext<
(nodeId: string, reordered: SubconceptLike[]) => void
>(() => {});
function MajorNode({ data, id }: NodeProps) {
const color = data.color as string;
const labelHtml = data.labelHtml as string;
const subconcepts = data.subconcepts as SubconceptLike[];
const highlighted = data.highlighted as boolean;
const hasSelection = data.hasSelection as boolean;
const highlightedSubconcepts = data.highlightedSubconcepts as Set<string>;
const starred = data.starred as boolean;
const onStarClick = data.onStarClick as () => void;
const masteredSubconcepts = data.masteredSubconcepts as
Set<string> | undefined;
const onSubconceptMastered = data.onSubconceptMastered as
((sub: string) => void) | undefined;
const onConceptDoubleClick = data.onConceptDoubleClick as
((conceptId: string) => void) | undefined;
const onSubconceptDoubleClick = data.onSubconceptDoubleClick as
((parentConceptId: string, subconceptId: string) => void) | undefined;
const onAddSubconcept = data.onAddSubconcept as
((parentConceptId: string) => void) | undefined;
const { debugMode, enableEditing } = useStaffTools();
const onSubconceptsReordered = useContext(SubconceptReorderContext);
// Index of the subconcept row being dragged / hovered over during an
// editing-enabled drag-and-drop reorder; null when no drag is in progress.
const [dragIndex, setDragIndex] = useState<number | null>(null);
const [dropIndex, setDropIndex] = useState<number | null>(null);
const allConceptContent = useContext(ConceptContentContext);
const conceptContentForNode = allConceptContent[id];
const debugTitle = useMemo(
() =>
debugMode
? JSON.stringify(
{
id,
label: labelHtml,
color,
subconcepts,
conceptContent: conceptContentForNode,
},
null,
2,
)
: undefined,
[debugMode, id, labelHtml, color, subconcepts, conceptContentForNode],
);
const showColor = !hasSelection || highlighted;
return (
<div
title={debugTitle}
data-testid={`major-node-${id}`}
style={{
width: 280,
borderRadius: 10,
overflow: "hidden",
borderTop: "1.5px solid #1E293B",
borderLeft: "1.5px solid #1E293B",
borderRight: "4px solid #1E293B",
borderBottom: "4px solid #1E293B",
boxShadow:
highlighted && hasSelection
? `0 0 0 6px ${color}50, 0 4px 16px rgba(0,0,0,0.2)`
: showColor
? "0 3px 12px rgba(0,0,0,0.18)"
: "0 2px 8px rgba(0,0,0,0.1)",
opacity: hasSelection && !highlighted ? 0.25 : 1,
cursor: "pointer",
transition: "opacity 0.25s, box-shadow 0.25s",
}}
>
<Handle
id="bottom"
type="target"
position={Position.Bottom}
style={{ opacity: 0, pointerEvents: "none" }}
/>
<div
data-testid={`major-node-header-${id}`}
onDoubleClick={() => {
Iif (!enableEditing) return;
onConceptDoubleClick?.(id);
}}
style={{
background: showColor ? color : "#94A3B8",
letterSpacing: "0.03em",
fontFamily: "Helvetica, Arial, sans-serif",
color: "#000000",
paddingTop: "27px",
paddingBottom: "6px",
paddingLeft: "14px",
paddingRight: "14px",
lineHeight: 1.1,
textAlign: "left",
fontSize: 28,
fontWeight: 700,
whiteSpace: "pre-line",
transition: "background 0.25s",
position: "relative",
}}
>
<span dangerouslySetInnerHTML={{ __html: labelHtml }} />
<div
data-testid={`star-button-${id}`}
onClick={(e) => {
e.stopPropagation();
onStarClick();
}}
onDoubleClick={(e) => e.stopPropagation()}
style={{
position: "absolute",
top: 12,
right: 12,
width: 28,
height: 28,
borderRadius: 6,
border: "2px solid #1E293B",
background: starred ? "#FACC15" : "#ffffff",
display: "flex",
alignItems: "center",
justifyContent: "center",
cursor: "pointer",
flexShrink: 0,
}}
>
<svg
width="14"
height="14"
viewBox="0 0 24 24"
fill={starred ? "#1E293B" : "none"}
stroke="#1E293B"
strokeWidth="2"
strokeLinecap="round"
strokeLinejoin="round"
>
<polygon points="12 2 15.09 8.26 22 9.27 17 14.14 18.18 21.02 12 17.77 5.82 21.02 7 14.14 2 9.27 8.91 8.26 12 2" />
</svg>
</div>
</div>
<div
style={{
display: "grid",
gridTemplateColumns: "1fr",
gap: 2,
background: showColor ? `${color}55` : "#CBD5E140",
padding: 2,
}}
>
{subconcepts.map((sub, i) => {
const isMastered = masteredSubconcepts?.has(sub.labelHtml) ?? false;
const isDropTarget =
dropIndex === i && dragIndex !== null && dragIndex !== i;
return (
<div
key={sub.id}
data-testid={`subconcept-row-${id}-${i}`}
// "nodrag" tells React Flow not to treat a drag that starts on
// this row as a node drag, so the HTML5 row drag can happen.
className={enableEditing ? "nodrag" : undefined}
draggable={enableEditing}
onDragStart={(e) => {
e.stopPropagation();
e.dataTransfer.effectAllowed = "move";
setDragIndex(i);
}}
onDragOver={(e) => {
if (dragIndex === null) return;
e.preventDefault();
e.stopPropagation();
setDropIndex(i);
}}
onDrop={(e) => {
if (dragIndex === null) return;
e.preventDefault();
e.stopPropagation();
if (dragIndex !== i) {
const reordered = [...subconcepts];
const [moved] = reordered.splice(dragIndex, 1);
reordered.splice(i, 0, moved);
onSubconceptsReordered(id, reordered);
}
setDragIndex(null);
setDropIndex(null);
}}
onDragEnd={() => {
setDragIndex(null);
setDropIndex(null);
}}
onDoubleClick={(e) => {
Iif (!enableEditing) return;
e.stopPropagation();
onSubconceptDoubleClick?.(id, String(sub.id));
}}
style={{
position: "relative",
background: isDropTarget
? "#e2e8f0"
: highlightedSubconcepts?.has(sub.labelHtml)
? toPastel(color)
: "#fff",
padding: "5px 6px",
textAlign: "center",
fontFamily: "Helvetica, Arial, sans-serif",
fontSize: 17,
fontWeight: 550,
lineHeight: 1.3,
color: "#1E293B",
whiteSpace: "pre-line",
cursor: enableEditing ? "grab" : undefined,
opacity: dragIndex === i ? 0.5 : 1,
}}
>
<div
data-testid={`subconcept-checkbox-${id}-${i}`}
onClick={(e) => {
e.stopPropagation();
onSubconceptMastered?.(sub.labelHtml);
}}
onDoubleClick={(e) => e.stopPropagation()}
style={{
position: "absolute",
left: 6,
top: "50%",
transform: "translateY(-50%)",
width: 14,
height: 14,
borderRadius: 3,
borderTop: "1px solid #1E293B",
borderLeft: "1px solid #1E293B",
borderRight: "2.5px solid #1E293B",
borderBottom: "2.5px solid #1E293B",
background: isMastered ? color : "#ffffff",
display: "flex",
alignItems: "center",
justifyContent: "center",
cursor: "pointer",
flexShrink: 0,
}}
>
{isMastered && (
<svg
width="8"
height="8"
viewBox="0 0 12 12"
fill="none"
stroke="#1E293B"
strokeWidth="2.5"
strokeLinecap="round"
strokeLinejoin="round"
>
<polyline points="2 6 5 9 10 3" />
</svg>
)}
</div>
<span dangerouslySetInnerHTML={{ __html: sub.labelHtml }} />
{enableEditing && (
<span
data-testid={`subconcept-drag-handle-${id}-${i}`}
aria-hidden="true"
style={{
position: "absolute",
right: 6,
top: "50%",
transform: "translateY(-50%)",
color: "#94A3B8",
fontSize: 13,
}}
>
⠿
</span>
)}
</div>
);
})}
{enableEditing && (
<button
type="button"
className="nodrag"
data-testid={`add-subconcept-button-${id}`}
onClick={(e) => {
e.stopPropagation();
onAddSubconcept?.(id);
}}
style={{
background: "#ffffff",
borderTop: "1px solid #1E293B",
borderLeft: "1px solid #1E293B",
borderRight: "2.5px solid #1E293B",
borderBottom: "2.5px solid #1E293B",
borderRadius: 6,
color: "#1E293B",
cursor: "pointer",
fontFamily: "Helvetica, Arial, sans-serif",
fontSize: 14,
fontWeight: 600,
margin: "6px 6px 4px",
padding: "6px 10px",
}}
>
Add subconcept
</button>
)}
</div>
<Handle
id="top"
type="source"
position={Position.Top}
style={{ opacity: 0, pointerEvents: "none" }}
/>
</div>
);
}
function DetailNode({ data, id }: NodeProps) {
const onDelete = useContext(DeleteDetailContext);
const cardType = data.cardType as string;
const itemLabel = data.itemLabel as string;
const conceptColor = data.conceptColor as string;
const greyed = data.greyed as boolean | undefined;
const bgColor = greyed ? "#f1f5f9" : toPastel(conceptColor);
const borderColor = greyed ? "#cbd5e1" : "#000000";
const pillBg = greyed ? "#cbd5e1" : conceptColor;
const textColor = greyed ? "#94a3b8" : "#1E293B";
return (
<div
style={{
background: bgColor,
border: `1px solid ${borderColor}`,
borderRadius: 8,
width: 250,
padding: "10px 10px",
position: "relative",
textAlign: "left",
}}
>
<Handle
id="bottom"
type="target"
position={Position.Bottom}
isConnectable={false}
style={{ opacity: 0, pointerEvents: "none" }}
/>
{/* X button */}
<div
className="concept-graph-detail-delete"
data-testid={`detail-delete-${id}`}
onClick={(e) => {
e.stopPropagation();
onDelete(id);
}}
>
<svg
className="concept-graph-detail-delete-icon"
width="10"
height="10"
viewBox="0 0 24 24"
fill="none"
strokeWidth="2.5"
strokeLinecap="round"
strokeLinejoin="round"
>
<line x1="18" y1="6" x2="6" y2="18" />
<line x1="6" y1="6" x2="18" y2="18" />
</svg>
</div>
{/* Pill label */}
<span
style={{
background: pillBg,
borderRadius: 100,
padding: "2px 10px",
border: `1px solid ${borderColor}`,
fontFamily: "Helvetica, Arial, sans-serif",
fontSize: 15,
fontWeight: 700,
color: textColor,
whiteSpace: "nowrap",
display: "inline-block",
marginBottom: 6,
marginRight: 20,
}}
>
{cardType}
</span>
{/* Item label */}
<div
style={{
paddingLeft: 6,
fontFamily: "Helvetica, Arial, sans-serif",
fontSize: 13,
fontWeight: 700,
color: textColor,
marginBottom: 6,
}}
>
{itemLabel}
</div>
{/* Content */}
<div
style={{
paddingLeft: 6,
paddingRight: 6,
fontFamily: "Helvetica, Arial, sans-serif",
fontSize: 13,
color: textColor,
lineHeight: 1.5,
}}
>
{cardType === "Example" ? (
<div
className="concept-detail-content"
style={{
fontFamily: "monospace",
fontSize: 12,
background: "#e2e8f0",
border: "1px solid #000000",
borderRadius: 6,
padding: "8px 12px",
margin: 0,
whiteSpace: "pre-wrap",
color: textColor,
lineHeight: 1.5,
}}
dangerouslySetInnerHTML={{
__html:
(data.cardContent as string) ||
`Example for "${itemLabel}" will appear here.`,
}}
/>
) : (
<div
className="concept-detail-content"
style={{
fontFamily: "Helvetica, Arial, sans-serif",
fontSize: 12,
color: "#1E293B",
lineHeight: 1.5,
}}
dangerouslySetInnerHTML={{
__html:
(data.cardContent as string) ||
`${cardType} for "${itemLabel}" will appear here.`,
}}
/>
)}
</div>
<Handle
type="source"
position={Position.Bottom}
style={{ opacity: 0, pointerEvents: "none" }}
/>
</div>
);
}
const nodeTypes: NodeTypes = { major: MajorNode, detail: DetailNode };
export default function ScaffoldConceptGraph({
majorConcepts,
positions,
conceptContent,
prereqEdgeData,
highlightedIds,
highlightedSubconcepts,
onConceptClick,
starredIds,
onStarClick,
onReset,
onDetailAdded,
onDetailDeleted,
restoredDetailCards,
onDetailMoved,
onMajorMoved,
masteredSubconcepts,
onSubconceptMastered,
onPaneClick,
onSubconceptsReordered,
onConceptDoubleClick,
onSubconceptDoubleClick,
onAddSubconcept,
}: ScaffoldConceptGraphProps) {
// majorConcepts/positions/prereqEdgeData were only stable for the lifetime
// of a mounted instance until concept/subconcept create/update mutations
// started invalidating the graph query in place, so this memo can now be
// recomputed after mount (e.g. after creating/editing a concept or
// subconcept). useNodesState only consumes its initial argument once, so
// the effect below re-syncs "major" nodes whenever majorConcepts changes,
// without clobbering locally-added detail cards or dragged node positions.
// (Prereq edges are already re-synced from majorConcepts/initialEdges by
// the highlightedIds effect further down.)
const { nodes: initialNodes, edges: initialEdges } = useMemo(
() => buildScaffoldGraphElements(positions, majorConcepts, prereqEdgeData),
[positions, majorConcepts, prereqEdgeData],
);
const [nodes, setNodes, onNodesChange] = useNodesState(initialNodes);
const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
const hasSelection = highlightedIds.size > 0;
const restoredRef = useRef(false);
const nodesRef = useRef(nodes);
useEffect(() => {
nodesRef.current = nodes;
}, [nodes]);
// Re-sync "major" nodes whenever the fetched concept graph changes (e.g.
// after creating a concept, editing a concept, or adding/editing a
// subconcept). Existing major nodes keep their current position (preserving
// drags/local reordering); their data (label, color, subconcepts, etc.) is
// refreshed from the latest fetch. New concepts are appended, and any major
// nodes no longer present in the graph are removed. Non-"major" nodes (e.g.
// detail cards) are left untouched.
const majorConceptsRef = useRef(majorConcepts);
useEffect(() => {
if (majorConceptsRef.current === majorConcepts) return;
majorConceptsRef.current = majorConcepts;
setNodes((nds) => {
const freshMajorById = new Map(initialNodes.map((n) => [n.id, n]));
const merged = nds
.filter((n) => n.type !== "major" || freshMajorById.has(n.id))
.map((n) => {
Iif (n.type !== "major") return n;
const fresh = freshMajorById.get(n.id);
Iif (!fresh) return n;
// Spread n.data first so any local additions from other effects
// (e.g. highlighted/starred flags, onConceptDoubleClick handlers set
// by the highlightedIds effect below) survive; fresh.data only ever
// contains labelHtml/color/subconcepts (see
// buildScaffoldGraphElements), so those are the only keys refreshed.
return { ...n, data: { ...n.data, ...fresh.data } };
});
const existingIds = new Set(merged.map((n) => n.id));
const newMajors = initialNodes.filter((n) => !existingIds.has(n.id));
return [...merged, ...newMajors];
});
}, [majorConcepts, initialNodes, setNodes]);
const highlightedIdsRef = useRef(highlightedIds);
useEffect(() => {
highlightedIdsRef.current = highlightedIds;
}, [highlightedIds]);
useEffect(() => {
if (restoredRef.current || !restoredDetailCards?.length) return;
restoredRef.current = true;
const newNodes = restoredDetailCards.map((card, i) => {
// card.conceptId is the parent concept's numeric id as a string (the React
// Flow node id). Content is keyed by each concept's own numeric id, so a
// subconcept card resolves its subconcept id via its label.
const concept = majorConcepts.find(
(c) => String(c.id) === card.conceptId,
);
const conceptLabel = concept?.labelHtml.replace(/\n/g, " ") ?? "";
const isConceptItself = card.itemLabel === conceptLabel;
const subconceptId = concept?.subconcepts.find(
(s) => s.labelHtml === card.itemLabel,
)?.id;
const contentKey = isConceptItself
? card.conceptId
: String(subconceptId);
const cardContent =
conceptContent[contentKey]?.[cardKeyMap[card.cardType]] ?? "";
return {
id: `detail-restored-${i}-${card.cardType}-${card.itemLabel}`,
type: "detail" as const,
position: { x: card.posX, y: card.posY },
data: {
cardType: card.cardType,
itemLabel: card.itemLabel,
conceptId: card.conceptId,
conceptColor: card.conceptColor,
cardContent,
},
};
});
const newEdges = restoredDetailCards.map((card, i) => ({
id: `edge-restored-${i}`,
source: card.conceptId,
target: newNodes[i].id,
targetHandle: "bottom",
type: "default",
style: {
stroke: card.conceptColor,
strokeWidth: 4,
strokeDasharray: "4 2",
},
markerEnd: { type: MarkerType.ArrowClosed, color: card.conceptColor },
data: { conceptColor: card.conceptColor },
}));
setNodes((prev) => [...prev, ...newNodes]);
setEdges((prev) => [...prev, ...newEdges]);
}, [restoredDetailCards, setNodes, setEdges, majorConcepts, conceptContent]);
const rfInstance = useRef<ReactFlowInstance<Node, Edge> | null>(null);
const handleReset = useCallback(() => {
setNodes(initialNodes);
setEdges(initialEdges);
onReset();
setTimeout(() => rfInstance.current?.fitView({ padding: 0.08 }), 50);
}, [onReset, setNodes, setEdges, initialNodes, initialEdges]);
const handleDeleteDetail = useCallback(
(id: string) => {
setNodes((nds) => {
const node = nds.find((n) => n.id === id);
Eif (node?.data) {
onDetailDeleted?.(
node.data.cardType as string,
node.data.itemLabel as string,
);
}
return nds.filter((n) => n.id !== id);
});
setEdges((eds) => eds.filter((e) => e.source !== id && e.target !== id));
},
[setNodes, setEdges, onDetailDeleted],
);
// A MajorNode reports a drag-and-drop reorder of its subconcepts: update the
// node's own data (nodes are snapshotted by useNodesState, so the prop-driven
// rebuild won't do it) and tell the page so it can persist the new order.
const handleSubconceptsReordered = useCallback(
(nodeId: string, reordered: SubconceptLike[]) => {
setNodes((nds) =>
nds.map((node) =>
node.id === nodeId
? { ...node, data: { ...node.data, subconcepts: reordered } }
: node,
),
);
onSubconceptsReordered?.(
Number(nodeId),
reordered.map((sub) => sub.id),
);
},
[setNodes, onSubconceptsReordered],
);
const onDragOver = useCallback((e: React.DragEvent) => {
e.preventDefault();
e.dataTransfer.dropEffect = "move";
}, []);
const onDrop = useCallback(
(e: React.DragEvent) => {
e.preventDefault();
const raw = e.dataTransfer.getData("application/scaffold-card");
if (!raw) return;
const { cardType, itemLabel, conceptId, conceptColor, cardContent } =
JSON.parse(raw);
const position = rfInstance.current?.screenToFlowPosition({
x: e.clientX,
y: e.clientY,
});
if (!position) return;
const nodeId = `detail-${Date.now()}`;
const isHighlighted = highlightedIdsRef.current.has(conceptId);
const hasSelectionNow = highlightedIdsRef.current.size > 0;
const edgeColor =
hasSelectionNow && !isHighlighted ? "#cbd5e1" : conceptColor;
setNodes((nds) => [
...nds,
{
id: nodeId,
type: "detail",
position,
data: { cardType, itemLabel, conceptColor, cardContent, conceptId },
},
]);
setEdges((eds) => [
...eds,
{
id: `detail-edge-${nodeId}`,
source: conceptId,
target: nodeId,
targetHandle: "bottom",
type: "default",
style: { stroke: edgeColor, strokeWidth: 4, strokeDasharray: "4 2" },
markerEnd: { type: MarkerType.ArrowClosed, color: edgeColor },
data: { conceptColor },
},
]);
onDetailAdded?.({
cardType,
itemLabel,
conceptId,
conceptColor,
posX: position.x,
posY: position.y,
});
},
[setNodes, setEdges, onDetailAdded],
);
// Update node appearance when highlighted set changes
useEffect(() => {
setNodes((nds) =>
nds.map((node) => {
if (node.type === "detail") {
const greyed =
hasSelection && !highlightedIds.has(node.data.conceptId as string);
return {
...node,
style: { ...node.style, opacity: greyed ? 0.5 : 1 },
data: { ...node.data, greyed },
};
}
return {
...node,
data: {
...node.data,
highlighted: highlightedIds.has(node.id),
hasSelection,
highlightedSubconcepts:
highlightedSubconcepts.get(node.id) ?? new Set(),
starred: starredIds.has(node.id),
onStarClick: () => onStarClick(node.id),
onConceptDoubleClick,
onSubconceptDoubleClick,
onAddSubconcept,
masteredSubconcepts: masteredSubconcepts,
onSubconceptMastered: (sub: string) => onSubconceptMastered(sub),
},
};
}),
);
}, [
highlightedIds,
hasSelection,
highlightedSubconcepts,
starredIds,
masteredSubconcepts,
onSubconceptMastered,
onStarClick,
onConceptDoubleClick,
onSubconceptDoubleClick,
onAddSubconcept,
setNodes,
]);
// Update edge appearance when highlighted set changes
useEffect(() => {
if (!hasSelection) {
setEdges((eds) => [
...initialEdges,
...eds
.filter(
(e) =>
e.id.startsWith("detail-edge-") ||
e.id.startsWith("edge-restored-"),
)
.map((e) => {
const color = (e.data?.conceptColor as string) ?? "#64748B";
return {
...e,
style: { stroke: color, strokeWidth: 4, strokeDasharray: "4 2" },
markerEnd: { type: MarkerType.ArrowClosed, color },
};
}),
]);
return;
}
setEdges((eds) => [
...prereqEdgeData.map((e) => {
const source = String(e.sourceId);
const target = String(e.targetId);
const isHighlighted =
highlightedIds.has(source) && highlightedIds.has(target);
const color =
e.color ??
majorConcepts.find((c) => c.id === e.sourceId)?.color ??
"#64748B";
return {
id: `prereq-${e.id}`,
source,
target,
sourceHandle: "top",
targetHandle: "bottom",
type: "default",
animated: isHighlighted,
style: {
stroke: isHighlighted ? color : "#CBD5E1",
strokeWidth: isHighlighted ? 5 : 4,
strokeDasharray: isHighlighted ? undefined : "5 3",
opacity: isHighlighted ? 1 : 0.2,
},
markerEnd: {
type: MarkerType.ArrowClosed,
color: isHighlighted ? color : "#CBD5E1",
},
};
}),
...eds
.filter(
(e) =>
e.id.startsWith("detail-edge-") ||
e.id.startsWith("edge-restored-"),
)
.map((e) => {
const isHighlighted = highlightedIds.has(e.source);
const color = (e.data?.conceptColor as string) ?? "#64748B";
return {
...e,
style: {
stroke: isHighlighted ? color : "#cbd5e1",
strokeWidth: 4,
strokeDasharray: "4 2",
},
markerEnd: {
type: MarkerType.ArrowClosed,
color: isHighlighted ? color : "#cbd5e1",
},
};
}),
]);
}, [
highlightedIds,
hasSelection,
setEdges,
initialEdges,
prereqEdgeData,
majorConcepts,
]);
const onNodeClick = useCallback(
(_e: React.MouseEvent, node: Node) => {
if (node.type === "detail") return;
onConceptClick(node.id);
},
[onConceptClick],
);
const handleNodesChange = useCallback(
(changes: NodeChange[]) => {
onNodesChange(changes);
changes.forEach((change) => {
Iif (
change.type === "position" &&
change.dragging === false &&
change.position
) {
const node = nodesRef.current.find((n) => n.id === change.id);
if (node?.type === "detail") {
onDetailMoved?.(
node.data.cardType as string,
node.data.itemLabel as string,
change.position.x,
change.position.y,
);
} else if (node?.type === "major") {
onMajorMoved?.(node.id, change.position.x, change.position.y);
}
}
});
},
[onNodesChange, onDetailMoved, onMajorMoved],
);
return (
<ConceptContentContext.Provider value={conceptContent}>
<SubconceptReorderContext.Provider value={handleSubconceptsReordered}>
<DeleteDetailContext.Provider value={handleDeleteDetail}>
<div style={{ width: "100%", height: "100%", position: "relative" }}>
<div
style={{
position: "absolute",
alignItems: "flex-end",
top: 12,
right: 12,
zIndex: 10,
display: "flex",
flexDirection: "column",
gap: 8,
}}
>
<ResetButton onReset={handleReset} />
<LevelLegend />
</div>
<ReactFlow
nodes={nodes}
edges={edges}
onNodesChange={handleNodesChange}
onEdgesChange={onEdgesChange}
nodeTypes={nodeTypes}
nodesConnectable={false}
onNodeClick={onNodeClick}
onInit={(instance: ReactFlowInstance<Node, Edge>) => {
rfInstance.current = instance;
}}
onDrop={onDrop}
onDragOver={onDragOver}
fitView
fitViewOptions={{ padding: 0.08 }}
minZoom={0.1}
onPaneClick={onPaneClick}
>
<Controls />
<Background
variant={BackgroundVariant.Dots}
color="#1E293B"
gap={20}
/>
</ReactFlow>
</div>
</DeleteDetailContext.Provider>
</SubconceptReorderContext.Provider>
</ConceptContentContext.Provider>
);
}
|