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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | 19x 29x 104x 143x 104x 104x 104x 104x 5x 5x 5x 143x 143x 137x 143x 183x 183x 183x 66x 183x 18x 165x 11x 143x 143x 143x 143x 104x 104x 104x 950x 15x 950x 104x 19x | import { CustomElementMetadata, CustomElementPropertyMetadata } from "../interfaces";
/**
* Initializes the properties of a custom element from the metadata configured
* @param Base The base class to extend
* @returns The mixin class
*/
const PropertyMetadataInitializerMixin = Base =>
class PropertyMetadataInitializer extends Base {
/**
* The properties to track in the class
*/
static properties: () => Record<string, CustomElementPropertyMetadata>;
protected static initalizeProperties(metadata: CustomElementMetadata): void {
const properties = this.getAllProperties();
Object.entries(properties).forEach(([key, value]) => this._initializeProperty(key, value, metadata));
// Merge the properties of the base class if any so we can validate and initialize
// the values of the properties of the base class in the instance
let baseClass = Object.getPrototypeOf(this.prototype)?.constructor;
Eif (baseClass !== undefined) {
const baseClassMetadata = baseClass.metadata;
if (baseClassMetadata !== undefined) {
metadata.properties = new Map([...metadata.properties, ...baseClassMetadata.properties]);
metadata.propertiesByAttribute = new Map([...metadata.propertiesByAttribute, ...baseClassMetadata.propertiesByAttribute]);
metadata.observedAttributes = [...metadata.observedAttributes, ...baseClassMetadata.observedAttributes];
}
}
}
/**
* Creates the setters and getters for the property
* @param name
* @param propertyMetadata
* @returns The name of the observed attribute for that property
*/
private static _initializeProperty(name: string, propertyMetadata: CustomElementPropertyMetadata, metadata: CustomElementMetadata): void {
propertyMetadata.name = name; // Set the name of the property
// Set the name of the attribute as same as the name of the property if no attribute name was provided
if (propertyMetadata.attribute === undefined) {
propertyMetadata.attribute = name;
}
Object.defineProperty(
this.prototype,
name,
{
get(): any {
let {
type
} = propertyMetadata;
const value = this._properties[name];
if (!Array.isArray(type)) {
type = [type];
}
if (type.includes(Function) && typeof value === 'function') { // Only call the function if the type of Function
return value();
}
return value;
},
set(this: any, value: unknown) {
this.setProperty(name, value);
},
configurable: true,
enumerable: true,
}
);
// Add it to the metadata properties so the properties of the instances can be validated and initialized
metadata.properties.set(name, propertyMetadata);
const {
attribute
} = propertyMetadata;
// Index the property descriptor by the attribute name
metadata.propertiesByAttribute.set(attribute, propertyMetadata); // Index by attribute name
// Add the observed attribute
metadata.observedAttributes.push(propertyMetadata.attribute.toLowerCase());
}
/**
* Retrieve the state of this and the base mixins
* @returns The merged state
*/
static getAllProperties(): Record<string, CustomElementPropertyMetadata> {
let properties = this.properties || {};
let baseClass = Object.getPrototypeOf(this.prototype)?.constructor;
while (baseClass._isMetadataInitializer === true) {
if (baseClass.properties !== undefined) {
properties = { ...properties, ...baseClass.properties };
}
baseClass = Object.getPrototypeOf(baseClass.prototype)?.constructor;
}
return properties;
}
}
export default PropertyMetadataInitializerMixin;
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