apple2js/js/components/Keyboard.tsx

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import { h, Fragment, JSX } from 'preact';
import cs from 'classnames';
import { useCallback, useEffect, useMemo, useState } from 'preact/hooks';
import { Apple2 as Apple2Impl } from '../apple2';
import {
keys2,
keys2e,
mapKeyEvent,
mapMouseEvent,
keysAsTuples
} from './util/keyboard';
/**
* Convenience function for massaging key labels for upper
* and lower case
*
* @param key Raw key label
* @returns Span representing that label
*/
const buildLabel = (key: string) => {
const small = key.length > 1 && !key.startsWith('&');
return (
<span
className={cs({ small })}
dangerouslySetInnerHTML={{ __html: key }}
/>
);
};
/**
* Key properties
*/
interface KeyProps {
lower: string;
upper: string;
active: boolean;
pressed: boolean;
onMouseDown: (event: MouseEvent) => void;
onMouseUp: (event: MouseEvent) => void;
}
/**
* Individual Key components. Sets up DOM data attributes to be passed to mouse
* handlers
*
* @param lower Lower key symbol
* @param upper Upper key symbol
* @param active Active state for shift, control, lock
* @param pressed Pressed state
* @param onMouseDown mouse down callback
* @param onMouseUp mouse up callback
*/
export const Key = ({
lower,
upper,
active,
pressed,
onMouseDown,
onMouseUp
}: KeyProps) => {
const keyName = lower.replace(/[&#;]/g, '');
const center =
lower === 'LOCK' ?
'v-center2' :
(upper === lower && upper.length > 1 ?
'v-center'
: ''
);
return (
<div
className={cs(
'key',
`key-${keyName}`,
center,
{ pressed, active },
)}
data-key1={lower}
data-key2={upper}
onMouseDown={onMouseDown}
onMouseUp={onMouseUp}
>
<div>
{buildLabel(upper)}
{upper !== lower && <><br />{buildLabel(lower)}</>}
</div>
</div>
);
};
/**
* Keyboard properties
*/
export interface KeyboardProps {
apple2: Apple2Impl | undefined;
e: boolean;
}
/**
* Keyboard component that can render an Apple ][ or //e keyboard
* and accept keyboard and mouse input. Relies heavily on the
* ancient keyboard css to achieve its appearance.
*
* @param apple2 Apple2 object
* @returns Keyboard component
*/
export const Keyboard = ({ apple2, e }: KeyboardProps) => {
const [pressed, setPressed] = useState<string[]>([]);
const [active, setActive] = useState<string[]>(['LOCK']);
const keys = useMemo(() => keysAsTuples(e ? keys2e : keys2 ), [e]);
// Set global keystroke handler
useEffect(() => {
const keyDown = (event: KeyboardEvent) => {
const key = mapKeyEvent(event, active.includes('LOCK'));
if (key !== 0xff) {
// CTRL-SHIFT-DELETE for reset
if (key === 0x7F && event.shiftKey && event.ctrlKey) {
apple2?.reset();
} else {
apple2?.getIO().keyDown(key);
}
}
};
const keyUp = () => {
apple2?.getIO().keyUp();
};
document.addEventListener('keydown', keyDown);
document.addEventListener('keyup', keyUp);
return () => {
document.removeEventListener('keydown', keyDown);
document.removeEventListener('keyup', keyUp);
};
}, [apple2, active]);
const onMouseDown = useCallback(
(event: JSX.TargetedMouseEvent<HTMLElement>) => {
if (!apple2) {
return;
}
const toggleActive = (key: string) => {
if (!active.includes(key)) {
setActive([...active, key]);
} else {
setActive(active.filter(x => x !== key));
}
};
const io = apple2.getIO();
const { keyCode, key, keyLabel } = mapMouseEvent(
event,
active.includes('SHIFT'),
active.includes('CTRL'),
active.includes('LOCK'),
true
);
if (keyCode !== 0xff) {
io.keyDown(keyCode);
} else if (key) {
switch (key) {
case 'SHIFT':
case 'CTRL':
case 'LOCK':
toggleActive(key);
break;
case 'RESET':
apple2.reset();
break;
case 'OPEN_APPLE':
io.ioSwitch(0, io.ioSwitch(0) ? 0 : 1);
toggleActive(key);
break;
case 'CLOSED_APPLE':
io.ioSwitch(1, io.ioSwitch(1) ? 0 : 1);
toggleActive(key);
break;
default:
break;
}
}
setPressed([...pressed, keyLabel]);
},
[apple2, active, pressed]
);
const onMouseUp = useCallback(
(event: JSX.TargetedMouseEvent<HTMLElement>) => {
const { keyLabel } = mapMouseEvent(
event,
active.includes('SHIFT'),
active.includes('CTRL'),
active.includes('LOCK'),
true
);
apple2?.getIO().keyUp();
setPressed(pressed.filter(x => x !== keyLabel));
},
[apple2, active, pressed]
);
const bindKey = ([lower, upper]: [string, string]) =>
<Key
lower={lower}
upper={upper}
active={active.includes(lower)}
pressed={pressed.includes(upper)}
onMouseDown={onMouseDown}
onMouseUp={onMouseUp}
/>;
const rows = keys.map((row, idx) =>
<div className={`row row${idx}`}>
{row.map(bindKey)}
</div>
);
return (
<div id="keyboard" style={{ marginLeft: e ? 0 : 15 }}>
{rows}
</div>
);
};