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import { createContext, FunctionComponent, ComponentChildren } from 'preact';
import { useContext } from 'preact/hooks';
import { batch, Signal } from '@preact/signals';
import { InputSocket } from './dataflow.ts';
import { cls } from './util.ts';
import styles from './node.module.css';
export type SocketHandler = (nodeId: number, socket: string, event: MouseEvent) => void;
export interface SocketHandlers {
onOutMouseDown?: SocketHandler;
onOutMouseUp?: SocketHandler;
onInMouseDown?: SocketHandler;
onInMouseUp?: SocketHandler;
}
export const SocketHandlers = createContext<SocketHandlers>({});
export const NodeId = createContext<number>(0);
export interface NodeComponentProps<I extends {}> {
id: number;
x: Signal<number>;
y: Signal<number>;
inputs: { [Property in keyof I]: InputSocket<I[Property]> };
}
export type NodeComponent<I extends {}> = FunctionComponent<NodeComponentProps<I>>;
export interface NodeInfo<I extends {}, O extends {}> {
component: NodeComponent<I>;
func: (inputs: I) => O;
inputs: I;
}
interface SocketProps {
name: string;
onMouseDown?: SocketHandler;
onMouseUp?: SocketHandler;
}
const Socket = ({ name, onMouseDown, onMouseUp }: SocketProps) => {
const nodeId = useContext(NodeId);
const wrap = (func?: SocketHandler) => (event: MouseEvent) => func && func(nodeId, name, event);
return (
<svg
width="10"
height="10"
viewBox="0 0 16 16"
onMouseDown={wrap(onMouseDown)}
onMouseUp={wrap(onMouseUp)}
>
<circle cx="8" cy="8" r="7" stroke="black" stroke-width="1" />
</svg>
);
};
const InSocket = ({ name }: { name: string }) => {
const handlers = useContext(SocketHandlers);
return (
<Socket name={name} onMouseDown={handlers.onInMouseDown} onMouseUp={handlers.onInMouseUp} />
);
};
const OutSocket = ({ name }: { name: string }) => {
const handlers = useContext(SocketHandlers);
return (
<Socket name={name} onMouseDown={handlers.onOutMouseDown} onMouseUp={handlers.onOutMouseUp} />
);
};
export interface InputProps<T> {
name: string;
label: string;
value: InputSocket<T>;
}
export const InputAny = ({ name, label }: Omit<InputProps<any>, 'value'>) => {
return (
<li class={cls(styles.in)}>
<InSocket name={name} />
{label}
</li>
);
};
export const InputArray = ({ name, label }: Omit<InputProps<any>, 'value'>) => {
return (
<li class={cls(styles.in, styles.number)}>
<InSocket name={name} />
{label}
</li>
);
};
const InputNum = (parseFunc: (string) => number) => ({ name, label, value }: InputProps<number>) => {
const onInput = (event: InputEvent) => {
value.value = parseFunc((event.target as HTMLInputElement).value);
}
return (
<li class={cls(styles.in, styles.number, value.link.value && styles.linked)}>
<InSocket name={name} />
<span>{label}</span>
<input type="number" value={value.manual.value} onInput={onInput} />
</li>
);
};
export const InputNumber = InputNum(parseFloat);
export const InputInteger = InputNum(parseInt);
export const InputVector = ({ name, label, value }: InputProps<[number, number, number]>) => {
const onInput = (i: 0 | 1 | 2) => (event: InputEvent) => {
const newValue: [number, number, number] = [...value.value];
newValue[i] = parseFloat((event.target as HTMLInputElement).value);
value.value = newValue;
};
return (
<li class={cls(styles.in, styles.vector, value.link.value && styles.linked)}>
<div>
<InSocket name={name} />
{label}
</div>
<input type="number" value={value.value[0]} onInput={onInput(0)} />
<input type="number" value={value.value[1]} onInput={onInput(1)} />
<input type="number" value={value.value[2]} onInput={onInput(2)} />
</li>
);
};
export interface InputSelectProps extends InputProps<string> {
options: string[] | Record<string, string[]>;
}
export const InputSelect = ({ name, label, value, options }: InputSelectProps) => {
const onChange = (event: InputEvent) => {
value.value = (event.target as HTMLSelectElement).value;
}
return (
<li class={cls(styles.in, styles.select, value.link.value && styles.linked)}>
<InSocket name={name} />
<select aria-label={label} onChange={onChange}>
{Array.isArray(options)
? options.map(opt => <option value={opt}>{opt}</option>)
: Object.entries(options).map(([label, group]) => (
<optgroup label={label}>
{group.map(opt => <option value={opt}>{opt}</option>)}
</optgroup>
))
}
</select>
</li>
);
};
export interface OutputProps {
name: string;
label: string;
}
const Output = ({ name, label, type }: OutputProps & { type: string }) => {
return (
<li class={cls(styles.out, styles[type])}>
{label}
<OutSocket name={name} />
</li>
);
};
export const OutputNumber = (props: OutputProps) => <Output {...props} type="number" />;
export const OutputVector = (props: OutputProps) => <Output {...props} type="vector" />;
export interface NodeShellProps {
id: number;
name: string;
x: Signal<number>;
y: Signal<number>;
children: ComponentChildren;
}
export const NodeShell = ({ id, name, x, y, children }: NodeShellProps) => {
const onMouseDown = (event: MouseEvent) => {
event.stopPropagation();
const onMouseMove = (event: MouseEvent) => batch(() => {
x.value += event.movementX;
y.value += event.movementY;
});
const onMouseUp = () => {
window.removeEventListener('mousemove', onMouseMove);
window.removeEventListener('mouseup', onMouseUp);
};
window.addEventListener('mousemove', onMouseMove);
window.addEventListener('mouseup', onMouseUp);
};
return (
<foreignObject x={x} y={y} width="0" height="0" class={styles.foreignObject}>
<details open tabindex={0} class={styles.node} onMouseDown={onMouseDown}>
<summary><span onClick={e => e.stopPropagation()}>{name}</span></summary>
<ul>
<NodeId.Provider value={id}>
{children}
</NodeId.Provider>
</ul>
</details>
</foreignObject>
);
};
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