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* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { useState, useEffect, useRef } from 'react';
import { render, Box, Text, useInput, useStdout } from 'ink';
import {
ScrollableList,
type ScrollableListRef,
} from '../src/ui/components/shared/ScrollableList.js';
import { ScrollProvider } from '../src/ui/contexts/ScrollProvider.js';
import { MouseProvider } from '../src/ui/contexts/MouseContext.js';
import { KeypressProvider } from '../src/ui/contexts/KeypressContext.js';
import {
enableMouseEvents,
disableMouseEvents,
} from '../src/ui/utils/mouse.js';
interface Item {
id: string;
title: string;
}
const getLorem = (index: number) =>
Array(10)
.fill(null)
.map(() => 'lorem ipsum '.repeat((index % 3) + 1).trim())
.join('\n');
const Demo = () => {
const { stdout } = useStdout();
const [size, setSize] = useState({
columns: stdout.columns,
rows: stdout.rows,
});
useEffect(() => {
const onResize = () => {
setSize({
columns: stdout.columns,
rows: stdout.rows,
});
};
stdout.on('resize', onResize);
return () => {
stdout.off('resize', onResize);
};
}, [stdout]);
const [items, setItems] = useState<Item[]>(() =>
Array.from({ length: 1000 }, (_, i) => ({
id: String(i),
title: `Item ${i + 1}`,
})),
);
const listRef = useRef<ScrollableListRef<Item>>(null);
useInput((input, key) => {
if (input === 'a' || input === 'A') {
setItems((prev) => [
...prev,
{ id: String(prev.length), title: `Item ${prev.length + 1}` },
]);
}
if ((input === 'e' || input === 'E') && !key.ctrl) {
setItems((prev) => {
if (prev.length === 0) return prev;
const lastIndex = prev.length - 1;
const lastItem = prev[lastIndex]!;
const newItem = { ...lastItem, title: lastItem.title + 'e' };
return [...prev.slice(0, lastIndex), newItem];
});
}
if (key.ctrl && input === 'e') {
listRef.current?.scrollToEnd();
}
// Let Ink handle Ctrl+C via exitOnCtrlC (default true) or handle explicitly if needed.
// For alternate buffer, explicit handling is often safer for cleanup.
if (key.escape || (key.ctrl && input === 'c')) {
process.exit(0);
}
});
return (
<MouseProvider mouseEventsEnabled={true}>
<KeypressProvider>
<ScrollProvider>
<Box
flexDirection="column"
width={size.columns}
height={size.rows - 1}
padding={1}
>
<Text>
Press 'A' to add an item. Press 'E' to edit
last item. Press 'Ctrl+E' to scroll to end. Press
'Esc' to exit. Mouse wheel or Shift+Up/Down to scroll.
</Text>
<Box flexGrow={1} borderStyle="round" borderColor="cyan">
<ScrollableList
ref={listRef}
data={items}
renderItem={({ item, index }) => (
<Box flexDirection="column" paddingBottom={2}>
<Box
sticky
flexDirection="column"
width={size.columns - 2}
opaque
stickyChildren={
<Box
flexDirection="column"
width={size.columns - 2}
opaque
>
<Text>{item.title}</Text>
<Box
borderStyle="single"
borderTop={true}
borderBottom={false}
borderLeft={false}
borderRight={false}
borderColor="gray"
/>
</Box>
}
>
<Text>{item.title}</Text>
</Box>
<Text color="gray">{getLorem(index)}</Text>
</Box>
)}
estimatedItemHeight={() => 14}
keyExtractor={(item) => item.id}
hasFocus={true}
initialScrollIndex={Number.MAX_SAFE_INTEGER}
initialScrollOffsetInIndex={Number.MAX_SAFE_INTEGER}
/>
</Box>
<Text>Count: {items.length}</Text>
</Box>
</ScrollProvider>
</KeypressProvider>
</MouseProvider>
);
};
// Enable mouse reporting before rendering
enableMouseEvents();
// Ensure cleanup happens on exit
process.on('exit', () => {
disableMouseEvents();
});
// Handle SIGINT explicitly to ensure cleanup runs if Ink doesn't catch it in time
process.on('SIGINT', () => {
process.exit(0);
});
render(<Demo />, { alternateBuffer: true });
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