fangliaoxiaochengxv/wxcomponents/vant/dist/common/relation.js

export function useParent(name, onEffect) {
    const path = `../${name}/index`;
    return {
        relations: {
            [path]: {
                type: 'ancestor',
                linked() {
                    onEffect && onEffect.call(this);
                },
                linkChanged() {
                    onEffect && onEffect.call(this);
                },
                unlinked() {
                    onEffect && onEffect.call(this);
                },
            },
        },
        mixin: Behavior({
            created() {
                Object.defineProperty(this, 'parent', {
                    get: () => this.getRelationNodes(path)[0],
                });
                Object.defineProperty(this, 'index', {
                    // @ts-ignore
                    get: () => {
                        var _a, _b;
                        return (_b = (_a = this.parent) === null || _a === void 0 ? void 0 : _a.children) === null || _b === void 0 ? void 0 : _b.indexOf(this);
                    },
                });
            },
        }),
    };
}

export function useChildren(name, onEffect) {
    const path = `../${name}/index`;
    return {
        relations: {
            [path]: {
                type: 'descendant',
                linked(target) {
                    onEffect && onEffect.call(this, target);
                },
                linkChanged(target) {
                    onEffect && onEffect.call(this, target);
                },
                unlinked(target) {
                    onEffect && onEffect.call(this, target);
                },
            },
        },
        mixin: Behavior({
            created() {
                Object.defineProperty(this, 'children', {
                    get: () => this.getRelationNodes(path) || [],
                });
            },
        }),
    };
}