Grid

Grid Annotations

Mark and highlight specific areas of the grid to attract the user's attention using grid annotations.

Annotations overlay custom React content on top of the grid. Each annotation requires two properties:

anchor: Defines where to position the annotation.
renderer: function that returns the content to display at the anchor position.

LyteNyte Grid accepts an array of annotations via the annotations property.

The demo below shows a basic annotation that appears when the user hovers over a cell in the Price, Quantity, Revenue, Cost, or Profit columns. The annotation highlights how these columns are related.

1
import "@1771technologies/lytenyte-pro/components.css";
2
import "@1771technologies/lytenyte-pro/light-dark.css";
3
import { salesData, type SaleDataItem } from "@1771technologies/grid-sample-data/sales-data";
4
import { Grid } from "@1771technologies/lytenyte-pro";
5
import { useClientDataSource } from "@1771technologies/lytenyte-pro";
6
import {
7
  AgeGroup,
8
  CostCell,
9
  CountryCell,
10
  DateCell,
11
  GenderCell,
12
  NumberCell,
13
  ProfitCell,
14
} from "./components.jsx";
15
import { useMemo, useState } from "react";
16

17
export interface GridSpec {
18
  readonly data: SaleDataItem;
19
}
20

21
export const columns: Grid.Column<GridSpec>[] = [
22
  { id: "date", name: "Date", cellRenderer: DateCell, width: 110 },
23
  { id: "product", name: "Product", width: 160 },
24
  { id: "unitPrice", name: "Price", type: "number", width: 80, cellRenderer: NumberCell },
25
  { id: "country", name: "Country", cellRenderer: CountryCell, width: 150 },
26
  { id: "revenue", name: "Revenue", width: 80, type: "number", cellRenderer: ProfitCell },
27
  { id: "profit", name: "Profit", width: 80, type: "number", cellRenderer: ProfitCell },
28
  { id: "productCategory", name: "Category", width: 120 },
29
  { id: "cost", name: "Cost", width: 80, type: "number", cellRenderer: CostCell },
30
  { id: "orderQuantity", name: "Quantity", type: "number", width: 60 },
31
  { id: "customerGender", name: "Gender", cellRenderer: GenderCell, width: 100 },
32
  { id: "age", name: "Age", type: "number", width: 80 },
33
  { id: "ageGroup", name: "Age Group", cellRenderer: AgeGroup, width: 160 },
34
  { id: "state", name: "State", width: 150 },
35
  { id: "subCategory", name: "Sub-Category", width: 160 },
36
];
37

38
const base: Grid.ColumnBase<GridSpec> = { width: 120 };
39

40
const colIndexMap = new Map(columns.map((c, i) => [c.id, i]));
41

42
const HIGHLIGHTS = [
43
  {
44
    colId: "orderQuantity",
45
    render: () => (
46
      <div
47
        style={{
48
          position: "absolute",
49
          inset: 0,
50
          border: "1px solid #3b82f6",
51
          background: "rgba(59, 130, 246, 0.1)",
52
          boxSizing: "border-box",
53
        }}
54
      />
55
    ),
56
  },
57
  {
58
    colId: "unitPrice",
59
    render: () => (
60
      <div
61
        style={{
62
          position: "absolute",
63
          inset: 0,
64
          border: "1px solid #8b5cf6",
65
          background: "rgba(139, 92, 246, 0.1)",
66
          boxSizing: "border-box",
67
        }}
68
      />
69
    ),
70
  },
71
  {
72
    colId: "cost",
73
    render: () => (
74
      <div
75
        style={{
76
          position: "absolute",
77
          inset: 0,
78
          border: "1px solid #f91616",
79
          background: "rgba(249, 115, 22, 0.1)",
80
          boxSizing: "border-box",
81
        }}
82
      />
83
    ),
84
  },
85
  {
86
    colId: "revenue",
87
    render: () => (
88
      <div
89
        style={{
90
          position: "absolute",
91
          inset: 0,
92
          border: "1px solid #22c55e",
93
          background: "rgba(34, 197, 94, 0.1)",
94
          boxSizing: "border-box",
95
        }}
96
      />
97
    ),
98
  },
99
  {
100
    colId: "profit",
101
    render: () => (
102
      <div
103
        style={{
104
          position: "absolute",
105
          inset: 0,
106
          border: "1px solid #10b981",
107
          background: "rgba(16, 185, 129, 0.1)",
108
          boxSizing: "border-box",
109
        }}
110
      />
111
    ),
112
  },
113
] satisfies { colId: string; render: Grid.Annotation<GridSpec>["render"] }[];
114

115
export default function GridDemo() {
116
  const [annotations, setAnnotations] = useState<Grid.Annotation<GridSpec>[]>([]);
117
  const ds = useClientDataSource<GridSpec>({ data: salesData });
118

119
  return (
120
    <div className="ln-grid" style={{ height: 500 }}>
121
      <Grid
122
        columns={columns}
123
        columnBase={base}
124
        rowSource={ds}
125
        annotations={annotations}
126
        events={useMemo<Grid.Events<GridSpec>>(() => {
127
          return {
128
            cell: {
129
              mouseEnter: ({ layout }) => {
130
                const rowStart = layout.rowIndex;
131
                const rowEnd = rowStart + 1;
132

133
                setAnnotations(
134
                  HIGHLIGHTS.map(({ colId, render }) => {
135
                    const colStart = colIndexMap.get(colId)!;
136
                    return {
137
                      id: `highlight-${colId}`,
138
                      anchor: { kind: "range", rowStart, rowEnd, colStart, colEnd: colStart + 1 },
139
                      render,
140
                    };
141
                  }),
142
                );
143
              },
144
              mouseLeave: () => setAnnotations([]),
145
            },
146
          };
147
        }, [])}
148
      />
149
    </div>
150
  );
151
}

1
import type { Grid } from "@1771technologies/lytenyte-pro";
2
import type { GridSpec } from "./demo";
3
import { format, isValid, parse } from "date-fns";
4
import { countryFlags } from "@1771technologies/grid-sample-data/sales-data";
5
import { clsx, type ClassValue } from "clsx";
6
import { twMerge } from "tailwind-merge";
7

8
export function DateCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
9
  const field = api.columnField(column, row);
10

11
  if (typeof field !== "string") return "-";
12

13
  const dateField = parse(field as string, "MM/dd/yyyy", new Date());
14

15
  if (!isValid(dateField)) return "-";
16

17
  const niceDate = format(dateField, "yyyy MMM dd");
18
  return <div className="flex h-full w-full items-center tabular-nums">{niceDate}</div>;
19
}
20

21
export function AgeGroup({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
22
  const field = api.columnField(column, row);
23

24
  if (field === "Youth (<25)") return <div className="text-[#944cec] dark:text-[#B181EB]">{field}</div>;
25
  if (field === "Young Adults (25-34)")
26
    return <div className="text-[#aa6c1a] dark:text-[#E5B474]">{field}</div>;
27
  if (field === "Adults (35-64)") return <div className="text-[#0f7d4c] dark:text-[#52B086]">{field}</div>;
28

29
  return "-";
30
}
31

32
export function GenderCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
33
  const field = api.columnField(column, row);
34

35
  if (field === "Male")
36
    return (
37
      <div className="flex h-full w-full items-center gap-2">
38
        <div className="flex size-6 items-center justify-center rounded-full bg-blue-500/50">
39
          <svg width="16" height="16" fill="currentcolor" viewBox="0 0 256 256">
40
            <path d="M216,28H168a12,12,0,0,0,0,24h19L154.28,84.74a84,84,0,1,0,17,17L204,69V88a12,12,0,0,0,24,0V40A12,12,0,0,0,216,28ZM146.41,194.46a60,60,0,1,1,0-84.87A60.1,60.1,0,0,1,146.41,194.46Z"></path>
41
          </svg>
42
        </div>
43
        Male
44
      </div>
45
    );
46

47
  if (field === "Female")
48
    return (
49
      <div className="flex h-full w-full items-center gap-2">
50
        <div className="flex size-6 items-center justify-center rounded-full bg-pink-500/50">
51
          <svg width="16" height="16" fill="currentcolor" viewBox="0 0 256 256">
52
            <path d="M212,96a84,84,0,1,0-96,83.13V196H88a12,12,0,0,0,0,24h28v20a12,12,0,0,0,24,0V220h28a12,12,0,0,0,0-24H140V179.13A84.12,84.12,0,0,0,212,96ZM68,96a60,60,0,1,1,60,60A60.07,60.07,0,0,1,68,96Z"></path>
53
          </svg>
54
        </div>
55
        Female
56
      </div>
57
    );
58

59
  return "-";
60
}
61

62
function tw(...c: ClassValue[]) {
63
  return twMerge(clsx(...c));
64
}
65

66
const formatter = new Intl.NumberFormat("en-US", {
67
  maximumFractionDigits: 2,
68
  minimumFractionDigits: 0,
69
});
70
export function ProfitCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
71
  const field = api.columnField(column, row);
72

73
  if (typeof field !== "number") return "-";
74

75
  const formatted = field < 0 ? `-$${formatter.format(Math.abs(field))}` : "$" + formatter.format(field);
76

77
  return (
78
    <div
79
      className={tw(
80
        "flex h-full w-full items-center justify-end tabular-nums",
81
        field < 0 && "text-red-600 dark:text-red-300",
82
        field > 0 && "text-green-600 dark:text-green-300",
83
      )}
84
    >
85
      {formatted}
86
    </div>
87
  );
88
}
89

90
export function NumberCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
91
  const field = api.columnField(column, row);
92

93
  if (typeof field !== "number") return "-";
94

95
  const formatted = field < 0 ? `-$${formatter.format(Math.abs(field))}` : "$" + formatter.format(field);
96

97
  return <div className={"flex h-full w-full items-center justify-end tabular-nums"}>{formatted}</div>;
98
}
99

100
export function CostCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
101
  const field = api.columnField(column, row);
102

103
  if (typeof field !== "number") return "-";
104

105
  const formatted = field < 0 ? `-$${formatter.format(Math.abs(field))}` : "$" + formatter.format(field);
106

107
  return (
108
    <div
109
      className={tw(
110
        "flex h-full w-full items-center justify-end tabular-nums text-red-600 dark:text-red-300",
111
      )}
112
    >
113
      {formatted}
114
    </div>
115
  );
116
}
117

118
export function CountryCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
119
  const field = api.columnField(column, row);
120

121
  const flag = countryFlags[field as keyof typeof countryFlags];
122
  if (!flag) return "-";
123

124
  return (
125
    <div className="flex h-full w-full items-center gap-2">
126
      <img className="size-4" src={flag} alt={`country flag of ${field}`} />
127
      <span>{String(field ?? "-")}</span>
128
    </div>
129
  );
130
}

The content rendered by an annotation can be anything your application requires. LyteNyte Grid provides the positioning system, your application provides the content to render.

Annotation Anchor Types

LyteNyte Grid supports three anchor types: range, header, and point. Use the kind field to select how the annotation is positioned.

Range Anchor

A range annotation covers a cell range. rowStart, rowEnd, colStart, and colEnd accept either a numeric index or a row or column ID.

1
anchor: {
2
  kind: "range",
3
  rowStart: 0,        // row index or row ID
4
  rowEnd: 5,          // row index or row ID
5
  colStart: "revenue", // column index or column ID
6
  colEnd: "profit",    // column index or column ID
7
}

LyteNyte Grid automatically splits a range annotation across pinned and unpinned grid sections, including:

Start-pinned, center, and end-pinned columns.
Top-pinned, center, and bottom-pinned rows.

A single range annotation renders correctly even when it spans multiple pinned sections.

Header Anchor

A header annotation spans one or more columns in the column header area.

1
anchor: {
2
  kind: "header",
3
  colStart: "revenue", // column index or column ID
4
  colEnd: "profit",    // column index or column ID
5
}

Header annotations are split across the start-pinned, center, and end-pinned header sections, just like range annotations.

Point Anchor

A point annotation places content at an absolute x and y coordinate in the scrollable data area. The x and y values are pixel offsets from the top-left corner of the first non-pinned row in the center scroll area.

This uses the same coordinate space as the virtual row layout.

1
anchor: {
2
  kind: "point",
3
  x: 400,
4
  y: 300,
5
}

By default, the annotation container applies pointer-events: none. If the annotation content needs to respond to pointer events, such as a clickable badge or tooltip trigger, set pointerEvents: "auto" on the element that should receive events.

Annotations Render Function

The render function receives { api } and returns a React node. The annotation container is already positioned and sized to match the anchor. Use position: "absolute" with inset: 0 to fill the container, or use any CSS positioning approach to place content within it.

1
render: ({ api }) => {
2
  // api gives you access to the full grid API
3
  return (
4
    <div
5
      style={{
6
        position: "absolute",
7
        inset: 0,
8
        border: "2px solid #ef4444",
9
        background: "rgba(239, 68, 68, 0.08)",
10
        boxSizing: "border-box",
11
        pointerEvents: "none",
12
      }}
13
    />
14
  );
15
},

By default, the annotation container has pointer-events: none applied. If your rendered content needs to respond to mouse events, such as a clickable badge or a tooltip trigger, set pointerEvents: "auto" on the element that should receive events.

Cell Notes

Cell notes are another common use case for annotations, allowing users to add context to a specific cell.

When a user hovers over a cell with a note, the grid displays the note content. Cells with notes show a small red triangle in the top-right corner.

Right-click any cell in the demo below to add or edit a note. Alternatively, select a cell and press Shift + F2 to open the note box.

Cell Note Annotation

demo.tsx
components.tsx

1
import "@1771technologies/lytenyte-pro/components.css";
2
import "@1771technologies/lytenyte-pro/light-dark.css";
3
import { salesData, type SaleDataItem } from "@1771technologies/grid-sample-data/sales-data";
4
import { Grid, useClientDataSource, virtualFromXY } from "@1771technologies/lytenyte-pro";
5
import { Menu, Popover } from "@1771technologies/lytenyte-pro/components";
6
import {
7
  AgeGroup,
8
  CostCell,
9
  CountryCell,
10
  DateCell,
11
  GenderCell,
12
  NumberCell,
13
  ProfitCell,
14
} from "./components.jsx";
15
import React, { useCallback, useMemo, useRef, useState } from "react";
16

17
export interface GridSpec {
18
  readonly data: SaleDataItem;
19
}
20

21
export const columns: Grid.Column<GridSpec>[] = [
22
  { id: "date", name: "Date", cellRenderer: DateCell, width: 110 },
23
  { id: "age", name: "Age", type: "number", width: 80 },
24
  { id: "ageGroup", name: "Age Group", cellRenderer: AgeGroup, width: 160 },
25
  { id: "customerGender", name: "Gender", cellRenderer: GenderCell, width: 100 },
26
  { id: "country", name: "Country", cellRenderer: CountryCell, width: 150 },
27
  { id: "orderQuantity", name: "Quantity", type: "number", width: 60 },
28
  { id: "unitPrice", name: "Price", type: "number", width: 80, cellRenderer: NumberCell },
29
  { id: "cost", name: "Cost", width: 80, type: "number", cellRenderer: CostCell },
30
  { id: "revenue", name: "Revenue", width: 80, type: "number", cellRenderer: ProfitCell },
31
  { id: "profit", name: "Profit", width: 80, type: "number", cellRenderer: ProfitCell },
32
  { id: "state", name: "State", width: 150 },
33
  { id: "product", name: "Product", width: 160 },
34
  { id: "productCategory", name: "Category", width: 120 },
35
  { id: "subCategory", name: "Sub-Category", width: 160 },
36
];
37

38
const base: Grid.ColumnBase<GridSpec> = { width: 120 };
39

40
interface CellRef {
41
  rowId: string;
42
  colId: string;
43
  rowIndex: number;
44
  colIndex: number;
45
}
46

47
interface NoteEntry {
48
  text: string;
49
  rowIndex: number;
50
  colIndex: number;
51
}
52

53
function cellKey(rowId: string, colId: string) {
54
  return `${rowId}|${colId}`;
55
}
56

57
function NoteMarker() {
58
  return (
59
    <div
60
      style={{
61
        position: "absolute",
62
        top: 0,
63
        insetInlineEnd: 0,
64
        width: 0,
65
        height: 0,
66
        borderTop: "8px solid #ef4444",
67
        borderInlineStart: "8px solid transparent",
68
      }}
69
    />
70
  );
71
}
72

73
const panelStyle: React.CSSProperties = {
74
  minWidth: 220,
75
  maxWidth: 300,
76
  background: "var(--ln-bg-popover)",
77
  border: "1px solid var(--ln-border-popover)",
78
  borderRadius: 8,
79
  padding: 10,
80
  boxShadow: "0 4px 16px var(--ln-border-field-and-button-shadow)",
81
};
82

83
const noteTextStyle: React.CSSProperties = {
84
  margin: 0,
85
  fontSize: 13,
86
  color: "var(--ln-text)",
87
  whiteSpace: "pre-wrap",
88
  wordBreak: "break-word",
89
};
90

91
function NoteEditContent({
92
  initialValue,
93
  onAccept,
94
  onCancel,
95
}: {
96
  initialValue: string;
97
  onAccept: (text: string) => void;
98
  onCancel: () => void;
99
}) {
100
  const [value, setValue] = useState(initialValue);
101

102
  return (
103
    <>
104
      <textarea
105
        autoFocus
106
        value={value}
107
        onChange={(e) => setValue(e.target.value)}
108
        placeholder="Add a note…"
109
        rows={3}
110
        style={{
111
          display: "block",
112
          width: "100%",
113
          minWidth: 220,
114
          minHeight: 60,
115
          resize: "both",
116
          border: "1px solid var(--ln-border-field-and-button)",
117
          borderRadius: 4,
118
          padding: "5px 8px",
119
          fontSize: 13,
120
          outline: "none",
121
          boxSizing: "border-box",
122
          fontFamily: "inherit",
123
          background: "var(--ln-bg-form-field)",
124
          color: "var(--ln-text)",
125
        }}
126
        onFocus={(e) => {
127
          const len = e.target.value.length;
128
          e.target.setSelectionRange(len, len);
129
        }}
130
        onKeyDownCapture={(e) => {
131
          if ((e.metaKey || e.ctrlKey) && e.key === "Enter") onAccept(value);
132
          if (e.key === "Escape") onCancel();
133
        }}
134
      />
135
      <p style={{ margin: "6px 0 0", fontSize: 11, color: "var(--ln-text-secondary)" }}>
136
        Tip: Press Ctrl/Cmd + Enter to commit.
137
      </p>
138
      <div
139
        style={{ display: "flex", gap: 6, marginTop: 10, justifyContent: "flex-end" }}
140
        onKeyDown={(e) => {
141
          if (e.key === "Escape") onCancel();
142
          if (e.key !== "ArrowLeft" && e.key !== "ArrowRight") return;
143
          const buttons = e.currentTarget.querySelectorAll<HTMLButtonElement>("button");
144
          const idx = Array.from(buttons).indexOf(e.target as HTMLButtonElement);
145
          if (idx === -1) return;
146
          e.preventDefault();
147
          const next = e.key === "ArrowRight" ? buttons[idx + 1] : buttons[idx - 1];
148
          next?.focus();
149
        }}
150
      >
151
        <button
152
          onClick={() => onAccept(value)}
153
          className="duration-120 bg-ln-primary-50 hover:bg-ln-primary-70 cursor-pointer transition-colors"
154
          style={{
155
            padding: "6px 14px",
156
            minWidth: 64,
157
            borderRadius: 4,
158
            border: "none",
159
            color: "white",
160
            fontSize: 12,
161
          }}
162
        >
163
          Save
164
        </button>
165
        <button
166
          onClick={onCancel}
167
          className="bg-ln-bg-button-light hover:bg-ln-gray-30 duration-120 cursor-pointer transition-colors"
168
          style={{
169
            padding: "6px 14px",
170
            minWidth: 64,
171
            borderRadius: 4,
172
            border: "1px solid var(--ln-border-button-light)",
173
            color: "var(--ln-text)",
174
            fontSize: 12,
175
          }}
176
        >
177
          Cancel
178
        </button>
179
      </div>
180
    </>
181
  );
182
}
183

184
function getCellEl(target: EventTarget | null): HTMLElement | null {
185
  return (target as HTMLElement | null)?.closest?.("[data-ln-cell]") as HTMLElement | null;
186
}
187

188
const INITIAL_NOTES: Map<string, NoteEntry> = new Map([
189
  [
190
    "leaf-0|country",
191
    {
192
      text: "Canada is our strongest market for premium accessories this quarter.",
193
      rowIndex: 0,
194
      colIndex: 4,
195
    },
196
  ],
197
  ["leaf-0|age", { text: "Youth segment, bulk order of 8 units at full price.", rowIndex: 0, colIndex: 1 }],
198
  [
199
    "leaf-1|age",
200
    {
201
      text: "Same SKU, different customer, quantity dropped to 3. Worth investigating.",
202
      rowIndex: 1,
203
      colIndex: 1,
204
    },
205
  ],
206
  [
207
    "leaf-2|country",
208
    {
209
      text: "Australia showing strong demand for bike stands. Potential growth market.",
210
      rowIndex: 2,
211
      colIndex: 4,
212
    },
213
  ],
214
  [
215
    "leaf-3|orderQuantity",
216
    { text: "19 units of a $5 item, France is bulk-buying water bottles.", rowIndex: 3, colIndex: 5 },
217
  ],
218
  [
219
    "leaf-5|ageGroup",
220
    {
221
      text: "Youth female segment in France, 14 units. Higher than the male equivalent.",
222
      rowIndex: 5,
223
      colIndex: 2,
224
    },
225
  ],
226
  [
227
    "leaf-6|country",
228
    {
229
      text: "Germany showing repeat demand for low-cost accessories. Low margin but consistent volume.",
230
      rowIndex: 6,
231
      colIndex: 4,
232
    },
233
  ],
234
]);
235
const INITIAL_PINNED: Set<string> = new Set();
236

237
export default function GridDemo() {
238
  const [notes, setNotes] = useState<Map<string, NoteEntry>>(INITIAL_NOTES);
239
  const [hovered, setHovered] = useState<CellRef | null>(null);
240
  const [hoveredEl, setHoveredEl] = useState<HTMLElement | null>(null);
241
  const [editing, setEditing] = useState<CellRef | null>(null);
242
  const [editingEl, setEditingEl] = useState<HTMLElement | null>(null);
243
  const [pinnedKeys, setPinnedKeys] = useState<Set<string>>(INITIAL_PINNED);
244
  const [menu, setMenu] = useState<CellRef | null>(null);
245
  const [menuAnchor, setMenuAnchor] = useState<Grid.T.VirtualTarget | null>(null);
246

247
  const editingRef = useRef(editing);
248
  editingRef.current = editing;
249
  // Cell element of the last right-clicked cell; read when menu items are actioned.
250
  const menuElRef = useRef<HTMLElement | null>(null);
251
  const annotationElsRef = useRef(new Map<string, HTMLElement>());
252

253
  const clearHoveredTimeout = useRef<ReturnType<typeof setTimeout> | null>(null);
254

255
  const ds = useClientDataSource<GridSpec>({ data: salesData });
256

257
  const cancelClear = useCallback(() => {
258
    if (clearHoveredTimeout.current) {
259
      clearTimeout(clearHoveredTimeout.current);
260
      clearHoveredTimeout.current = null;
261
    }
262
  }, []);
263

264
  // Annotations render only the triangle marker — all floating UI is handled by Popover below.
265
  // Each annotation captures the [data-ln-annotation-id] element (always in the DOM, positioned
266
  // via CSS transform) so pinned Popovers survive virtualization.
267
  const annotations = useMemo<Grid.Annotation<GridSpec>[]>(() => {
268
    const result: Grid.Annotation<GridSpec>[] = [];
269
    for (const [key, entry] of notes) {
270
      const { rowIndex, colIndex } = entry;
271
      result.push({
272
        id: `note-${key}`,
273
        anchor: {
274
          kind: "range",
275
          rowStart: rowIndex,
276
          rowEnd: rowIndex + 1,
277
          colStart: colIndex,
278
          colEnd: colIndex + 1,
279
        },
280
        render: () => (
281
          <div
282
            ref={(el) => {
283
              if (el) {
284
                const annotationEl = el.closest("[data-ln-annotation-id]") as HTMLElement | null;
285
                if (annotationEl) annotationElsRef.current.set(key, annotationEl);
286
              } else {
287
                annotationElsRef.current.delete(key);
288
              }
289
            }}
290
            style={{ position: "absolute", inset: 0, pointerEvents: "none" }}
291
          >
292
            <NoteMarker />
293
          </div>
294
        ),
295
      });
296
    }
297
    return result;
298
  }, [notes]);
299

300
  const events = useMemo<Grid.Events<GridSpec>>(
301
    () => ({
302
      cell: {
303
        contextMenu: ({ event, row, column, layout }) => {
304
          event.preventDefault();
305
          event.stopPropagation();
306
          setEditing(null);
307
          setEditingEl(null);
308
          setHovered(null);
309
          setHoveredEl(null);
310
          menuElRef.current = getCellEl(event.target);
311
          setMenuAnchor(virtualFromXY(event.clientX, event.clientY));
312
          setMenu({
313
            rowId: row.id,
314
            colId: column.id,
315
            rowIndex: layout.rowIndex,
316
            colIndex: layout.colIndex,
317
          });
318
        },
319
        keyDown: ({ event, row, column, layout }) => {
320
          if (event.key !== "F2" || !event.shiftKey || event.ctrlKey || event.metaKey || editingRef.current)
321
            return;
322
          event.preventDefault();
323
          event.stopPropagation();
324
          const el = getCellEl(event.target);
325
          setEditing({
326
            rowId: row.id,
327
            colId: column.id,
328
            rowIndex: layout.rowIndex,
329
            colIndex: layout.colIndex,
330
          });
331
          setEditingEl(el);
332
        },
333
        mouseEnter: ({ layout, row, column, event }) => {
334
          if (editingRef.current) return;
335
          cancelClear();
336
          setHoveredEl(getCellEl(event.target));
337
          setHovered({
338
            rowId: row.id,
339
            colId: column.id,
340
            rowIndex: layout.rowIndex,
341
            colIndex: layout.colIndex,
342
          });
343
        },
344
        mouseLeave: () => {
345
          if (editingRef.current) return;
346
          clearHoveredTimeout.current = setTimeout(() => {
347
            setHovered(null);
348
            setHoveredEl(null);
349
            clearHoveredTimeout.current = null;
350
          }, 80);
351
        },
352
      },
353
    }),
354
    [cancelClear],
355
  );
356

357
  const hovKey = hovered ? cellKey(hovered.rowId, hovered.colId) : null;
358
  const menuKey = menu ? cellKey(menu.rowId, menu.colId) : null;
359
  const menuHasNote = !!menuKey && notes.has(menuKey);
360
  const menuIsPinned = !!menuKey && pinnedKeys.has(menuKey);
361

362
  // The tooltip shows when hovering a noted cell (not already pinned) or when the context
363
  // menu is open on a noted cell. In either case a single Popover handles the display.
364
  const tooltipNote =
365
    menu && menuHasNote && menuKey
366
      ? (notes.get(menuKey) ?? null)
367
      : !editing && hovKey && !pinnedKeys.has(hovKey)
368
        ? (notes.get(hovKey) ?? null)
369
        : null;
370
  const tooltipAnchor = menu && menuHasNote ? menuElRef.current : hoveredEl;
371

372
  const editKey = editing ? cellKey(editing.rowId, editing.colId) : null;
373
  const editAnchor = (editKey && annotationElsRef.current.get(editKey)) ?? editingEl;
374

375
  const closeEditing = () => {
376
    setEditing(null);
377
    setEditingEl(null);
378
    setHovered(null);
379
    setHoveredEl(null);
380
  };
381

382
  return (
383
    <>
384
      <Menu
385
        anchor={menuAnchor}
386
        open={!!menu}
387
        modal={false}
388
        lockScroll
389
        onOpenChange={(b) => {
390
          if (!b) {
391
            setMenu(null);
392
            setMenuAnchor(null);
393
          }
394
        }}
395
      >
396
        <Menu.Popover>
397
          <Menu.Container>
398
            {menu && !menuHasNote && (
399
              <Menu.Item
400
                onAction={() => {
401
                  setEditing(menu);
402
                  setEditingEl(menuElRef.current);
403
                  setMenu(null);
404
                  setMenuAnchor(null);
405
                }}
406
              >
407
                Add Note
408
              </Menu.Item>
409
            )}
410
            {menu && menuHasNote && (
411
              <>
412
                <Menu.Item
413
                  onAction={() => {
414
                    setEditing(menu);
415
                    setEditingEl(menuElRef.current);
416
                    setMenu(null);
417
                    setMenuAnchor(null);
418
                  }}
419
                >
420
                  Edit Note
421
                </Menu.Item>
422
                <Menu.Item
423
                  onAction={() => {
424
                    const key = menuKey!;
425
                    setNotes((p) => {
426
                      const n = new Map(p);
427
                      n.delete(key);
428
                      return n;
429
                    });
430
                    setPinnedKeys((p) => {
431
                      const n = new Set(p);
432
                      n.delete(key);
433
                      return n;
434
                    });
435
                    setMenu(null);
436
                    setMenuAnchor(null);
437
                  }}
438
                >
439
                  Delete Note
440
                </Menu.Item>
441
                <Menu.Item
442
                  onAction={() => {
443
                    const key = menuKey!;
444
                    setPinnedKeys((p) => {
445
                      const n = new Set(p);
446
                      if (menuIsPinned) n.delete(key);
447
                      else n.add(key);
448
                      return n;
449
                    });
450
                    setMenu(null);
451
                    setMenuAnchor(null);
452
                  }}
453
                >
454
                  {menuIsPinned ? "Hide Note" : "Show Note"}
455
                </Menu.Item>
456
              </>
457
            )}
458
          </Menu.Container>
459
        </Menu.Popover>
460
      </Menu>
461

462
      {/* Hover tooltip and menu-open tooltip share one Popover */}
463
      <Popover
464
        anchor={tooltipAnchor}
465
        open={!!tooltipNote && !!tooltipAnchor}
466
        modal={false}
467
        focusTrap={false}
468
        focusInitial={false}
469
        lightDismiss={false}
470
        hide
471
        placement="top-end"
472
        sideOffset={8}
473
      >
474
        <Popover.Container
475
          style={{ ...panelStyle, borderRadius: 2, pointerEvents: menu ? "none" : undefined }}
476
          onMouseEnter={!menu ? cancelClear : undefined}
477
          onMouseLeave={
478
            !menu
479
              ? () => {
480
                  setHovered(null);
481
                  setHoveredEl(null);
482
                }
483
              : undefined
484
          }
485
        >
486
          <Popover.Arrow />
487
          <p style={noteTextStyle}>{tooltipNote?.text ?? ""}</p>
488
        </Popover.Container>
489
      </Popover>
490

491
      {/* Edit / add popover — modal so focus is trapped inside */}
492
      <Popover
493
        anchor={editAnchor}
494
        open={!!editing}
495
        lockScroll={false}
496
        lightDismiss={false}
497
        onOpenChange={(open) => {
498
          if (!open) closeEditing();
499
        }}
500
        placement="right-start"
501
        sideOffset={8}
502
      >
503
        {editing && (
504
          <Popover.Container style={{ ...panelStyle, maxWidth: "none", padding: 4 }}>
505
            <Popover.Arrow />
506
            <NoteEditContent
507
              key={cellKey(editing.rowId, editing.colId)}
508
              initialValue={notes.get(cellKey(editing.rowId, editing.colId))?.text ?? ""}
509
              onAccept={(text) => {
510
                const key = cellKey(editing.rowId, editing.colId);
511
                if (!text.trim()) {
512
                  setPinnedKeys((p) => {
513
                    const n = new Set(p);
514
                    n.delete(key);
515
                    return n;
516
                  });
517
                }
518
                setNotes((prev) => {
519
                  const next = new Map(prev);
520
                  if (text.trim()) {
521
                    next.set(key, {
522
                      text: text.trim(),
523
                      rowIndex: editing.rowIndex,
524
                      colIndex: editing.colIndex,
525
                    });
526
                  } else {
527
                    next.delete(key);
528
                  }
529
                  return next;
530
                });
531
                closeEditing();
532
              }}
533
              onCancel={closeEditing}
534
            />
535
          </Popover.Container>
536
        )}
537
      </Popover>
538

539
      {/* One Popover per pinned note, anchored to the annotation element which is always
540
          in the DOM (positioned via CSS transform) so it survives row virtualization. */}
541
      {[...pinnedKeys].map((key) => {
542
        const note = notes.get(key);
543
        const el = annotationElsRef.current.get(key);
544
        if (!note || !el) return null;
545
        return (
546
          <Popover
547
            key={key}
548
            anchor={el}
549
            open
550
            modal={false}
551
            focusTrap={false}
552
            lightDismiss={false}
553
            hide
554
            placement="top-end"
555
            sideOffset={8}
556
          >
557
            <Popover.Container style={panelStyle}>
558
              <Popover.Arrow />
559
              <p style={noteTextStyle}>{note.text}</p>
560
            </Popover.Container>
561
          </Popover>
562
        );
563
      })}
564

565
      <div className="ln-grid" style={{ height: 500 }}>
566
        <Grid columns={columns} columnBase={base} rowSource={ds} annotations={annotations} events={events} />
567
      </div>
568
    </>
569
  );
570
}

1
import type { Grid } from "@1771technologies/lytenyte-pro";
2
import type { GridSpec } from "./demo";
3
import { format, isValid, parse } from "date-fns";
4
import { countryFlags } from "@1771technologies/grid-sample-data/sales-data";
5
import { clsx, type ClassValue } from "clsx";
6
import { twMerge } from "tailwind-merge";
7

8
export function DateCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
9
  const field = api.columnField(column, row);
10

11
  if (typeof field !== "string") return "-";
12

13
  const dateField = parse(field as string, "MM/dd/yyyy", new Date());
14

15
  if (!isValid(dateField)) return "-";
16

17
  const niceDate = format(dateField, "yyyy MMM dd");
18
  return <div className="flex h-full w-full items-center tabular-nums">{niceDate}</div>;
19
}
20

21
export function AgeGroup({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
22
  const field = api.columnField(column, row);
23

24
  if (field === "Youth (<25)") return <div className="text-[#944cec] dark:text-[#B181EB]">{field}</div>;
25
  if (field === "Young Adults (25-34)")
26
    return <div className="text-[#aa6c1a] dark:text-[#E5B474]">{field}</div>;
27
  if (field === "Adults (35-64)") return <div className="text-[#0f7d4c] dark:text-[#52B086]">{field}</div>;
28

29
  return "-";
30
}
31

32
export function GenderCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
33
  const field = api.columnField(column, row);
34

35
  if (field === "Male")
36
    return (
37
      <div className="flex h-full w-full items-center gap-2">
38
        <div className="flex size-6 items-center justify-center rounded-full bg-blue-500/50">
39
          <svg width="16" height="16" fill="currentcolor" viewBox="0 0 256 256">
40
            <path d="M216,28H168a12,12,0,0,0,0,24h19L154.28,84.74a84,84,0,1,0,17,17L204,69V88a12,12,0,0,0,24,0V40A12,12,0,0,0,216,28ZM146.41,194.46a60,60,0,1,1,0-84.87A60.1,60.1,0,0,1,146.41,194.46Z"></path>
41
          </svg>
42
        </div>
43
        Male
44
      </div>
45
    );
46

47
  if (field === "Female")
48
    return (
49
      <div className="flex h-full w-full items-center gap-2">
50
        <div className="flex size-6 items-center justify-center rounded-full bg-pink-500/50">
51
          <svg width="16" height="16" fill="currentcolor" viewBox="0 0 256 256">
52
            <path d="M212,96a84,84,0,1,0-96,83.13V196H88a12,12,0,0,0,0,24h28v20a12,12,0,0,0,24,0V220h28a12,12,0,0,0,0-24H140V179.13A84.12,84.12,0,0,0,212,96ZM68,96a60,60,0,1,1,60,60A60.07,60.07,0,0,1,68,96Z"></path>
53
          </svg>
54
        </div>
55
        Female
56
      </div>
57
    );
58

59
  return "-";
60
}
61

62
function tw(...c: ClassValue[]) {
63
  return twMerge(clsx(...c));
64
}
65

66
const formatter = new Intl.NumberFormat("en-US", {
67
  maximumFractionDigits: 2,
68
  minimumFractionDigits: 0,
69
});
70
export function ProfitCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
71
  const field = api.columnField(column, row);
72

73
  if (typeof field !== "number") return "-";
74

75
  const formatted = field < 0 ? `-$${formatter.format(Math.abs(field))}` : "$" + formatter.format(field);
76

77
  return (
78
    <div
79
      className={tw(
80
        "flex h-full w-full items-center justify-end tabular-nums",
81
        field < 0 && "text-red-600 dark:text-red-300",
82
        field > 0 && "text-green-600 dark:text-green-300",
83
      )}
84
    >
85
      {formatted}
86
    </div>
87
  );
88
}
89

90
export function NumberCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
91
  const field = api.columnField(column, row);
92

93
  if (typeof field !== "number") return "-";
94

95
  const formatted = field < 0 ? `-$${formatter.format(Math.abs(field))}` : "$" + formatter.format(field);
96

97
  return <div className={"flex h-full w-full items-center justify-end tabular-nums"}>{formatted}</div>;
98
}
99

100
export function CostCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
101
  const field = api.columnField(column, row);
102

103
  if (typeof field !== "number") return "-";
104

105
  const formatted = field < 0 ? `-$${formatter.format(Math.abs(field))}` : "$" + formatter.format(field);
106

107
  return (
108
    <div
109
      className={tw(
110
        "flex h-full w-full items-center justify-end tabular-nums text-red-600 dark:text-red-300",
111
      )}
112
    >
113
      {formatted}
114
    </div>
115
  );
116
}
117

118
export function CountryCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
119
  const field = api.columnField(column, row);
120

121
  const flag = countryFlags[field as keyof typeof countryFlags];
122
  if (!flag) return "-";
123

124
  return (
125
    <div className="flex h-full w-full items-center gap-2">
126
      <img className="size-4" src={flag} alt={`country flag of ${field}`} />
127
      <span>{String(field ?? "-")}</span>
128
    </div>
129
  );
130
}

Note

Cell notes use positioned popovers. You can customize every aspect of the note, including theming, timing, and visibility. To show notes only when opened, rather than on hover, or to adjust note timing, see the Popover guide.

Marching Ants

The marching ants effect is an animated dashed border indicating an active copied or cut selection, a familiar pattern from spreadsheet applications like Excel and Google Sheets. Annotations make this straightforward to implement in LyteNyte Grid.

The demo below supports standard clipboard shortcuts. Select a range of cells, then press:

Ctrl/Cmd + C: Copy the selection to the clipboard and show the marching ants border.
Ctrl/Cmd + X: Cut the selection to the clipboard and show the marching ants border.
Ctrl/Cmd + V: Pastes the clipboard content. If the original cut selection is pasted, the source cells are cleared.
Esc: Dismiss the marching ants border without pasting.

The marching ants border remains visible as long as focus stays within the grid, including when the user clicks another cell. Moving focus outside the grid to another part of the page clears the border. However, switching applications preserves the border, allowing users to navigate away and return to paste.

The animation itself is an SVG <rect> with stroke-dasharray driven by a CSS @keyframes rule that increments stroke-dashoffset, creating the illusion of movement along the border.

Marching Ants Annotation

1
"use client";
2

3
import "./demo.css";
4
import "@1771technologies/lytenyte-pro/components.css";
5
import "@1771technologies/lytenyte-pro/light-dark.css";
6
import { Grid, useClientDataSource } from "@1771technologies/lytenyte-pro";
7
import {
8
  CountryCell,
9
  CustomerRating,
10
  DateCell,
11
  DurationCell,
12
  NameCell,
13
  NumberCell,
14
  OverdueCell,
15
} from "./components.js";
16
import { useCallback, useMemo, useRef, useState } from "react";
17

18
function MarchingAnts() {
19
  return (
20
    <svg
21
      xmlns="http://www.w3.org/2000/svg"
22
      style={{
23
        position: "absolute",
24
        inset: 0,
25
        width: "100%",
26
        height: "100%",
27
        overflow: "visible",
28
        pointerEvents: "none",
29
      }}
30
    >
31
      <rect
32
        x="0"
33
        y="0"
34
        width="100%"
35
        height="100%"
36
        fill="none"
37
        stroke="var(--ln-primary-50)"
38
        strokeWidth="2"
39
        strokeDasharray="8 5"
40
        className="ln-marching-ants"
41
      />
42
    </svg>
43
  );
44
}
45
import { loanData, type LoanDataItem } from "@1771technologies/grid-sample-data/loan-data";
46

47
export interface GridSpec {
48
  readonly data: LoanDataItem;
49
}
50

51
const columns: Grid.Column<GridSpec>[] = [
52
  { name: "Name", id: "name", cellRenderer: NameCell, width: 130 },
53
  { name: "Country", id: "country", width: 150, cellRenderer: CountryCell },
54
  { name: "Loan Amount", id: "loanAmount", width: 120, type: "number", cellRenderer: NumberCell },
55
  { name: "Balance", id: "balance", type: "number", cellRenderer: NumberCell },
56
  { name: "Customer Rating", id: "customerRating", type: "number", width: 125, cellRenderer: CustomerRating },
57
  { name: "Marital", id: "marital" },
58
  { name: "Education", id: "education", hide: true },
59
  { name: "Job", id: "job", width: 120, hide: true },
60
  { name: "Overdue", id: "overdue", cellRenderer: OverdueCell },
61
  { name: "Duration", id: "duration", type: "number", cellRenderer: DurationCell },
62
  { name: "Date", id: "date", width: 110, cellRenderer: DateCell },
63
  { name: "Age", id: "age", width: 80, type: "number" },
64
  { name: "Contact", id: "contact" },
65
];
66

67
const base: Grid.ColumnBase<GridSpec> = {
68
  width: 100,
69
  cellRenderer: (p) => {
70
    const field = p.api.columnField(p.column, p.row);
71

72
    if (field == null) return "";
73

74
    return String(field);
75
  },
76
};
77

78
export default function ExportDemo() {
79
  const [data, setData] = useState(loanData);
80
  const ds = useClientDataSource({
81
    data: data,
82
    onRowDataChange: (p) => {
83
      setData((prev) => {
84
        const next = [...prev];
85
        p.center.forEach((v, i) => {
86
          next[i] = v as LoanDataItem;
87
        });
88

89
        return next;
90
      });
91
    },
92
  });
93
  const [selections, setSelections] = useState<Grid.T.DataRect[]>([]);
94
  const [copiedRect, setCopiedRect] = useState<Grid.T.DataRect | null>(null);
95
  // Non-null when the last copy was a cut — cleared after a paste so source cells are nulled.
96
  const cutRectRef = useRef<Grid.T.DataRect | null>(null);
97
  // The exact text written to the clipboard by this grid. Used to detect if the user
98
  // copied something else externally before pasting back in.
99
  const copiedTextRef = useRef<string | null>(null);
100

101
  const [api, setApi] = useState<Grid.API<GridSpec> | null>(null);
102
  const apiRef = useRef(api);
103
  apiRef.current = api;
104
  const setDataRef = useRef(setData);
105
  setDataRef.current = setData;
106
  const copiedRectRef = useRef(copiedRect);
107
  copiedRectRef.current = copiedRect;
108

109
  const getFirstSelection = useCallback(() => {
110
    return selections.at(0) ?? null;
111
  }, [selections]);
112

113
  const handleCopy = useCallback(async (sel: Grid.T.DataRect): Promise<string | null> => {
114
    if (!api) return null;
115

116
    const data = await api.exportData({ rect: sel });
117

118
    return data.data
119
      .map((row) => row.map((cell) => `${cell ?? ""}`).join("\t"))
120
      .join("\n");
121
  }, [api]);
122

123
  const handleGridUpdate = useCallback(
124
    async (updates: unknown[][]) => {
125
      if (!api) return;
126
      if (!document.activeElement) return null;
127

128
      const position = api.positionFromElement(document.activeElement as HTMLElement);
129
      if (position?.kind !== "cell") return;
130

131
      // Repeat paste for excel like behavior
132
      const selection = api.cellSelections().at(-1);
133
      let repeat: Repeat | null = null;
134
      if (selection) {
135
        const xDiff = selection.columnEnd - selection.columnStart;
136
        const yDiff = selection.rowEnd - selection.rowStart;
137

138
        const columnLengths = updates.map((x) => x.length);
139

140
        const allTheSameLength = columnLengths.every((x) => x === columnLengths[0]);
141

142
        if (allTheSameLength)
143
          repeat = rectRepeat({ cols: columnLengths[0], rows: updates.length }, { cols: xDiff, rows: yDiff });
144
      }
145
      if (repeat) {
146
        for (let r = 0; r < updates.length; r++) {
147
          const row = updates[r];
148
          const newRow = [];
149
          for (let i = 0; i < repeat.x; i++) newRow.push(...row);
150

151
          updates[r] = newRow;
152
        }
153

154
        const final = [];
155
        for (let i = 0; i < repeat.y; i++) final.push(...updates);
156

157
        updates = final;
158
      }
159

160
      const map = new Map<number, { column: number; value: any }[]>();
161

162
      for (let i = 0; i < updates.length; i++) {
163
        const rowI = i + position.rowIndex;
164
        const row = api.rowByIndex(rowI).get();
165

166
        if (!row?.data || api.rowIsGroup(row)) continue;
167

168
        const data = updates[i];
169

170
        const columnUpdates: { column: number; value: any }[] = [];
171

172
        for (let j = 0; j < data.length; j++) {
173
          const colI = j + position.colIndex;
174

175
          const column = api.columnByIndex(colI);
176
          if (!column) continue;
177

178
          const rawValue = data[j];
179

180
          let value = column.type === "number" ? Number.parseFloat(rawValue as string) : rawValue;
181
          if (column.type === "number" && Number.isNaN(value)) value = rawValue;
182

183
          columnUpdates.push({ column: colI, value: value });
184
        }
185
        map.set(rowI, columnUpdates);
186
      }
187

188
      if (!api.editUpdateCells(map)) alert("Copy operation failed");
189
    },
190
    [api],
191
  );
192

193
  const annotations = useMemo<Grid.Annotation<GridSpec>[]>(() => {
194
    if (!copiedRect) return [];
195
    return [
196
      {
197
        id: "marching-ants",
198
        zIndex: 10,
199
        anchor: {
200
          kind: "range",
201
          rowStart: copiedRect.rowStart,
202
          rowEnd: copiedRect.rowEnd,
203
          colStart: copiedRect.columnStart,
204
          colEnd: copiedRect.columnEnd,
205
        },
206
        render: () => <MarchingAnts />,
207
      },
208
    ];
209
  }, [copiedRect]);
210

211
  return (
212
    <div className="ln-grid" style={{ height: 500 }}>
213
      <Grid
214
        events={useMemo<Grid.Events<GridSpec>>(() => {
215
          return {
216
            viewport: {
217
              keyDown: async (p) => {
218
                if (p.event.key === "Escape") {
219
                  const ourText = copiedTextRef.current;
220
                  cutRectRef.current = null;
221
                  copiedTextRef.current = null;
222
                  setCopiedRect(null);
223
                  setSelections([]);
224
                  if (ourText) {
225
                    navigator.clipboard.readText().then((current) => {
226
                      if (normalizeNewlines(current) === ourText) navigator.clipboard.writeText("");
227
                    });
228
                  }
229
                  return;
230
                }
231

232
                if (!p.event.ctrlKey && !p.event.metaKey) return;
233

234
                if (p.event.key === "x") {
235
                  const sel = getFirstSelection();
236
                  if (!sel) return;
237
                  const textPromise = handleCopy(sel);
238
                  // Call clipboard.write() synchronously — before any await — so Safari
239
                  // counts this as within the user gesture and allows the clipboard write.
240
                  navigator.clipboard.write([
241
                    new ClipboardItem({
242
                      "text/plain": textPromise.then((t) => new Blob([t ?? ""], { type: "text/plain" })),
243
                    }),
244
                  ]);
245
                  const text = await textPromise;
246
                  copiedTextRef.current = text;
247
                  cutRectRef.current = sel;
248
                  setCopiedRect(sel);
249
                } else if (p.event.key === "v") {
250
                  const content = normalizeNewlines(await navigator.clipboard.readText());
251

252
                  // If the clipboard content differs from what this grid wrote, the user
253
                  // copied something externally — discard our copy/cut context.
254
                  if (copiedTextRef.current !== null && content !== copiedTextRef.current) {
255
                    cutRectRef.current = null;
256
                    copiedTextRef.current = null;
257
                    copiedRectRef.current = null;
258
                    setCopiedRect(null);
259
                    setSelections([]);
260
                    return;
261
                  }
262

263
                  if (!content) return;
264

265
                  const cut = cutRectRef.current;
266
                  const wascut = !!cut;
267
                  cutRectRef.current = null;
268

269
                  const updates = content.split("\n").map((c) => {
270
                    return c
271
                      .trim()
272
                      .split("\t")
273
                      .map((x) => x.trim());
274
                  });
275

276
                  // Capture paste start position before calling handleGridUpdate so we can
277
                  // detect overlap with both the cut source and the copied rect.
278
                  let pasteRowStart = -1;
279
                  let pasteColStart = -1;
280
                  if (apiRef.current && document.activeElement) {
281
                    const pos = apiRef.current.positionFromElement(document.activeElement as HTMLElement);
282
                    if (pos?.kind === "cell") {
283
                      pasteRowStart = pos.rowIndex;
284
                      pasteColStart = pos.colIndex;
285
                    }
286
                  }
287

288
                  // For copy (not cut), check if the paste destination overlaps the copied rect.
289
                  // If it does, treat it as a "consume" — clear clipboard, ants, and selection.
290
                  let overlapsCopy = false;
291
                  if (!wascut && pasteRowStart >= 0) {
292
                    const snap = copiedRectRef.current;
293
                    if (snap) {
294
                      const pasteRowEnd = pasteRowStart + updates.length;
295
                      const pasteColEnd = pasteColStart + Math.max(...updates.map((r) => r.length));
296
                      overlapsCopy =
297
                        pasteRowStart < snap.rowEnd &&
298
                        pasteRowEnd > snap.rowStart &&
299
                        pasteColStart < snap.columnEnd &&
300
                        pasteColEnd > snap.columnStart;
301
                    }
302
                  }
303

304
                  const shouldConsume = wascut || overlapsCopy;
305
                  if (shouldConsume) {
306
                    copiedTextRef.current = null;
307
                    setCopiedRect(null);
308
                    setSelections([]);
309
                    navigator.clipboard.writeText("");
310
                  }
311

312
                  handleGridUpdate(updates);
313

314
                  // Clear source cells. Cells that overlap with the paste destination are
315
                  // skipped — the paste values should win over the clear.
316
                  if (cut && apiRef.current) {
317
                    const api = apiRef.current;
318
                    const pasteRowEnd = pasteRowStart >= 0 ? pasteRowStart + updates.length : -1;
319
                    const pasteColEnd =
320
                      pasteColStart >= 0 ? pasteColStart + Math.max(...updates.map((r) => r.length)) : -1;
321

322
                    const rowClears = new Map<number, string[]>();
323
                    for (let r = cut.rowStart; r < cut.rowEnd; r++) {
324
                      const row = api.rowByIndex(r).get() as any;
325
                      if (row?.__srcIndex == null) continue;
326
                      const fields: string[] = [];
327
                      for (let c = cut.columnStart; c < cut.columnEnd; c++) {
328
                        if (
329
                          pasteRowStart >= 0 &&
330
                          r >= pasteRowStart &&
331
                          r < pasteRowEnd &&
332
                          c >= pasteColStart &&
333
                          c < pasteColEnd
334
                        )
335
                          continue;
336
                        const col = api.columnByIndex(c) as any;
337
                        if (col) fields.push(col.field ?? col.id);
338
                      }
339
                      if (fields.length > 0) rowClears.set(row.__srcIndex, fields);
340
                    }
341

342
                    if (rowClears.size > 0) {
343
                      setDataRef.current((prev) => {
344
                        const next = [...prev];
345
                        for (const [idx, fields] of rowClears) {
346
                          const row = next[idx] as any;
347
                          if (!row) continue;
348
                          const cleared = { ...row };
349
                          for (const field of fields) cleared[field] = null;
350
                          next[idx] = cleared;
351
                        }
352
                        return next;
353
                      });
354
                    }
355
                  }
356
                } else if (p.event.key === "c") {
357
                  // Prevent Safari's native copy event from firing after keydown and
358
                  // overwriting our clipboard data with the (empty) DOM selection.
359
                  p.event.preventDefault();
360
                  const sel = getFirstSelection();
361
                  if (!sel) return;
362
                  const textPromise = handleCopy(sel);
363
                  // Same synchronous write pattern as cut above.
364
                  navigator.clipboard.write([
365
                    new ClipboardItem({
366
                      "text/plain": textPromise.then((t) => new Blob([t ?? ""], { type: "text/plain" })),
367
                    }),
368
                  ]);
369
                  const text = await textPromise;
370
                  copiedTextRef.current = text;
371
                  cutRectRef.current = null;
372
                  setCopiedRect(sel);
373
                }
374
              },
375
              blur: ({ viewport }) => {
376
                setTimeout(() => {
377
                  if (!document.hasFocus()) return; // switched apps — keep ants
378
                  if (document.activeElement && viewport.contains(document.activeElement)) return; // focus came back into grid
379
                  // Only hide the ants — preserve cut state so paste can still clear source cells.
380
                  setCopiedRect(null);
381
                }, 0);
382
              },
383
            },
384
          };
385
        }, [getFirstSelection, handleCopy, handleGridUpdate, setSelections])}
386
        ref={setApi}
387
        columnBase={base}
388
        columns={columns}
389
        editMode="cell"
390
        rowSource={ds}
391
        annotations={annotations}
392
        cellSelections={selections}
393
        onCellSelectionChange={setSelections}
394
        cellSelectionMode="range"
395
      />
396
    </div>
397
  );
398
}
399
function normalizeNewlines(s: string) {
400
  return s.replace(/\r\n/g, "\n");
401
}
402

403
type Rect = { rows: number; cols: number };
404
type Repeat = { x: number; y: number };
405

406
function rectRepeat(small: Rect, big: Rect): Repeat | null {
407
  const sr = small.rows;
408
  const sc = small.cols;
409
  const br = big.rows;
410
  const bc = big.cols;
411

412
  // Basic validation (optional but handy)
413
  if (![sr, sc, br, bc].every(Number.isInteger)) return null;
414
  if (sr <= 0 || sc <= 0 || br <= 0 || bc <= 0) return null;
415

416
  // Must divide evenly for a perfect tiling
417
  if (br % sr !== 0) return null;
418
  if (bc % sc !== 0) return null;
419

420
  return { x: bc / sc, y: br / sr };
421
}

1
@keyframes marchingAnts {
2
  to {
3
    stroke-dashoffset: -26;
4
  }
5
}
6

7
.ln-marching-ants {
8
  animation: marchingAnts 0.4s linear infinite;
9
}

1
import { type Grid } from "@1771technologies/lytenyte-pro";
2
import type { GridSpec } from "./demo.js";
3
import { twMerge } from "tailwind-merge";
4
import clsx, { type ClassValue } from "clsx";
5
import { countryFlags, nameToAvatar } from "@1771technologies/grid-sample-data/loan-data";
6
import { useId, useMemo } from "react";
7
import { format, isValid, parse } from "date-fns";
8

9
export function tw(...c: ClassValue[]) {
10
  return twMerge(clsx(...c));
11
}
12

13
const formatter = new Intl.NumberFormat("en-US", {
14
  maximumFractionDigits: 2,
15
  minimumFractionDigits: 0,
16
});
17
export function NumberCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
18
  const field = api.columnField(column, row);
19

20
  if (typeof field !== "number")
21
    return <div className="flex h-full w-full items-center">{String(field ?? "")}</div>;
22

23
  const formatted = field < 0 ? `-$${formatter.format(Math.abs(field))}` : "$" + formatter.format(field);
24

25
  return (
26
    <div
27
      className={tw(
28
        "flex h-full w-full items-center justify-end tabular-nums",
29
        field < 0 && "text-red-600 dark:text-red-300",
30
        field > 0 && "text-green-600 dark:text-green-300",
31
      )}
32
    >
33
      {formatted}
34
    </div>
35
  );
36
}
37

38
export function NameCell({ api, row }: Grid.T.CellRendererParams<GridSpec>) {
39
  if (!api.rowIsLeaf(row) || !row.data) return;
40

41
  const name = row.data.name;
42
  const url = nameToAvatar[name];
43

44
  return (
45
    <div className="flex h-full w-full items-center gap-2">
46
      {url && <img className="border-ln-border-strong h-7 w-7 rounded-full border" src={url} alt={name} />}
47
      <div className="text-ln-text-dark flex flex-col gap-0.5">
48
        <div>{name}</div>
49
      </div>
50
    </div>
51
  );
52
}
53

54
export function DurationCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
55
  const field = api.columnField(column, row);
56

57
  if (typeof field === "number")
58
    return <div className="flex h-full w-full items-center justify-end">{formatter.format(field)} days</div>;
59

60
  return <div className="flex h-full w-full items-center justify-start">{String(field ?? "")}</div>;
61
}
62

63
export function CountryCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
64
  const field = api.columnField(column, row);
65

66
  const flag = countryFlags[field as keyof typeof countryFlags];
67

68
  return (
69
    <div className="flex h-full w-full items-center gap-2">
70
      {flag && <img className="size-4" src={flag} alt={`country flag of ${field}`} />}
71
      <span>{String(field ?? "")}</span>
72
    </div>
73
  );
74
}
75

76
export function DateCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
77
  const field = api.columnField(column, row);
78

79
  if (typeof field !== "string")
80
    return <div className="flex h-full w-full items-center">{String(field ?? "")}</div>;
81

82
  const dateField = parse(field as string, "yyyy-MM-dd", new Date());
83

84
  if (!isValid(dateField))
85
    return <div className="flex h-full w-full items-center">{String(field ?? "")}</div>;
86

87
  const niceDate = format(dateField, "yyyy MMM dd");
88
  return <div className="flex h-full w-full items-center tabular-nums">{niceDate}</div>;
89
}
90

91
export function OverdueCell({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
92
  const field = api.columnField(column, row);
93
  if (field !== "Yes" && field !== "No")
94
    return <div className="flex h-full w-full items-center">{String(field ?? "")}</div>;
95

96
  return (
97
    <div
98
      className={tw(
99
        "flex w-full items-center justify-center rounded-lg py-1 font-bold",
100
        field === "No" && "bg-green-500/10 text-green-600",
101
        field === "Yes" && "bg-red-500/10 text-red-400",
102
      )}
103
    >
104
      {field}
105
    </div>
106
  );
107
}
108

109
export function CustomerRating({ api, row, column }: Grid.T.CellRendererParams<GridSpec>) {
110
  const field = api.columnField(column, row);
111
  if (typeof field !== "number" || field > 5 || field < 0)
112
    return <div className="flex h-full w-full items-center">{String(field ?? "")}</div>;
113

114
  return (
115
    <div className="flex justify-center text-yellow-300">
116
      <StarRating value={field} />
117
    </div>
118
  );
119
}
120

121
export default function StarRating({ value = 0 }: { value: number }) {
122
  const uid = useId();
123

124
  const max = 5;
125

126
  const clamped = useMemo(() => {
127
    const n = Number.isFinite(value) ? value : 0;
128
    return Math.max(0, Math.min(max, n));
129
  }, [value, max]);
130

131
  const stars = useMemo(() => {
132
    return Array.from({ length: max }, (_, i) => {
133
      const fill = Math.max(0, Math.min(1, clamped - i)); // 0..1
134
      return { i, fill };
135
    });
136
  }, [clamped, max]);
137

138
  return (
139
    <div className={"inline-flex items-center"} role="img">
140
      {stars.map(({ i, fill }) => {
141
        const gradId = `${uid}-star-${i}`;
142
        return <StarIcon key={i} fillFraction={fill} gradientId={gradId} />;
143
      })}
144
    </div>
145
  );
146
}
147

148
function StarIcon({ fillFraction, gradientId }: { fillFraction: number; gradientId: string }) {
149
  const pct = Math.round(fillFraction * 100);
150

151
  return (
152
    <svg width="20" height="20" viewBox="0 0 24 24" aria-hidden="true">
153
      <defs>
154
        <linearGradient id={gradientId} x1="0%" y1="0%" x2="100%" y2="0%">
155
          <stop offset={`${pct}%`} stopColor="currentColor" />
156
          <stop offset={`${pct}%`} stopColor="transparent" />
157
        </linearGradient>
158
      </defs>
159

160
      <path
161
        d="M12 17.27L18.18 21l-1.64-7.03L22 9.24l-7.19-.61L12 2 9.19 8.63 2 9.24l5.46 4.73L5.82 21z"
162
        fill={`url(#${gradientId})`}
163
      />
164
      {/* Optional outline for crisp edges */}
165
      <path
166
        d="M12 17.27L18.18 21l-1.64-7.03L22 9.24l-7.19-.61L12 2 9.19 8.63 2 9.24l5.46 4.73L5.82 21z"
167
        fill="none"
168
        stroke="transparent"
169
        strokeWidth="1"
170
        opacity="0.35"
171
      />
172
    </svg>
173
  );
174
}

Next Steps

Responsive Container: Learn how to configure containers for LyteNyte Grid.
API Extensions: Extend LyteNyte Grid's base API with custom functions and state.
Grid Animations: Learn how to animate rows and columns within the grid.