@adpt/core/dist/src/hooks/state.js

AdaptJS core library

"use strict";
/*
 * Copyright 2019 Unbounded Systems, LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
Object.defineProperty(exports, "__esModule", { value: true });
const utils_1 = require("@adpt/utils");
const lodash_1 = require("lodash");
const error_1 = require("../error");
const jsx_1 = require("../jsx");
const hooks_1 = require("./hooks");
function useState(init) {
    const ctx = hooks_1.currentContext();
    const stateInfo = ctx.options.hookInfo.stateInfo;
    const stateStore = ctx.options.stateStore;
    const elem = ctx.element;
    const count = stateInfo.get(ctx.element) || 0;
    stateInfo.set(ctx.element, count + 1);
    if (!jsx_1.isElementImpl(elem))
        throw new error_1.InternalError(`Build context element is not ElementImpl`);
    const ns = elem.stateNamespace;
    let stateValue = stateStore.elementState(ns);
    if (stateValue === undefined)
        stateValue = {};
    const key = "" + count;
    if (stateValue[key] === undefined) {
        stateValue[key] = lodash_1.isFunction(init) ? init() : init;
        stateStore.setElementState(ns, stateValue);
    }
    function setState(val) {
        const updater = async (prev) => {
            if (prev == null || !utils_1.isObject(prev))
                throw new error_1.InternalError(`previous state was not an object`);
            if (lodash_1.isFunction(val))
                val = val(prev[key]);
            return { [key]: await val };
        };
        if (!jsx_1.isElementImpl(elem))
            throw new error_1.InternalError(`Build context element is not ElementImpl`);
        elem.setState(updater);
    }
    return [stateValue[count], setState];
}
exports.useState = useState;
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