src/fields/CursorField.ts


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import { createSimpleSchema, object, serializable } from 'serializr';
import { Deserializable } from '../client/util/SerializationHelper';
import { Copy, FieldChanged, ToScriptString, ToString } from './FieldSymbols';
import { ObjectField } from './ObjectField';

export type CursorPosition = {
    x: number;
    y: number;
};

export type CursorMetadata = {
    id: string;
    identifier: string;
    timestamp: number;
};

export type CursorData = {
    metadata: CursorMetadata;
    position: CursorPosition;
};

const PositionSchema = createSimpleSchema({
    x: true,
    y: true,
});

const MetadataSchema = createSimpleSchema({
    id: true,
    identifier: true,
    timestamp: true,
});

const CursorSchema = createSimpleSchema({
    metadata: object(MetadataSchema),
    position: object(PositionSchema),
});

@Deserializable('cursor')
export default class CursorField extends ObjectField {
    @serializable(object(CursorSchema))
    readonly data: CursorData;

    constructor(data: CursorData) {
        super();
        this.data = data;
    }

    setPosition(position: CursorPosition) {
        this.data.position = position;
        this.data.metadata.timestamp = Date.now();
        this[FieldChanged]?.();
    }

    [Copy]() {
        return new CursorField(this.data);
    }

    [ToScriptString]() {
        return 'invalid';
    }
    [ToString]() {
        return 'invalid';
    }
}