@awcrotwell/motion/dist/BindingManager.js

Motion allows you to build reactive, real-time frontend UI components in your Amber application using pure Crystal that are reusable, testable & encapsulated. For brevity, we will call them MotionComponents.

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
const parseBindings_1 = __importStar(require("./parseBindings"));
class BindingManager {
    constructor(client, element) {
        this.client = client;
        this.element = element;
        this._handlers = new Map();
        this.update();
    }
    update() {
        const targetBindings = this.parseBindings();
        this._removeExtraHandlers(targetBindings);
        this._setupMissingHandlers(targetBindings);
    }
    shutdown() {
        for (const [eventName, callback] of this._handlers.values()) {
            this.element.removeEventListener(eventName, callback);
        }
        this._handlers.clear();
    }
    parseBindings() {
        const { motionAttribute } = this.client;
        const bindingsString = this.element.getAttribute(motionAttribute);
        const bindings = new Map();
        for (const binding of parseBindings_1.default(bindingsString, this.element)) {
            bindings.set(binding.id, binding);
        }
        return bindings;
    }
    _buildHandlerForBinding({ mode, motion }) {
        return (event) => {
            const component = this.client.findComponent(event.target);
            if (component) {
                component.processMotion(motion, event);
                if (mode === parseBindings_1.MODE_HANDLE) {
                    event.preventDefault();
                }
            }
        };
    }
    _setupMissingHandlers(targetBindings) {
        for (const [id, binding] of targetBindings.entries()) {
            if (!this._handlers.has(id)) {
                const { event } = binding;
                const handler = this._buildHandlerForBinding(binding);
                this.element.addEventListener(event, handler);
                this._handlers.set(id, [event, handler]);
            }
        }
    }
    _removeExtraHandlers(targetBindings) {
        for (const [id, [event, callback]] of this._handlers.entries()) {
            if (!targetBindings.has(id)) {
                this.element.removeEventListener(event, callback);
                this._handlers.delete(id);
            }
        }
    }
}
exports.default = BindingManager;