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import valueConverter from "../helpers/valueConverter";
import { CustomElementPropertyMetadata } from "../interfaces";
import PropertyMetadataInitializerMixin from "./PropertyMetadataInitializerMixin";
const AttributeChangeHandlerMixin = Base =>
class AttributeChangeHandler extends PropertyMetadataInitializerMixin(Base) { // This mixin requires an implementation of setProperty
/**
* The properties of the instance
*/
private _properties: Record<string, any> = {};
/**
* Map of the metadata of the changed properties so that the "change" method can be called after the update of the DOM
*/
private _changedProperties: Map<string, CustomElementPropertyMetadata> = new Map<string, CustomElementPropertyMetadata>();
constructor() {
super();
this._initializePropertiesWithDefaultValues((this.constructor as any).metadata.properties);
}
/**
* Initializes the properties that have a default value
* @param propertiesMetadata
*/
private _initializePropertiesWithDefaultValues(propertiesMetadata: Map<string, CustomElementPropertyMetadata>) {
for (const [name, property] of propertiesMetadata) {
const {
value
} = property;
if (this._properties[name] === undefined &&
value !== undefined) {
this.setProperty(name, value);
}
}
}
connectedCallback() {
super.connectedCallback?.();
const {
properties
} = (this.constructor as any).metadata;
this._validateRequiredProperties(properties);
}
// Without defining this method, the observedAttributes getter will not be called
// Also no need to check that the property was configured because if it is not configured,
// it will not generate the observedAttribute and therefore this method won't be called for that attribute
/**
* Called when there is a change in an attribute
* @param attributeName
* @param oldValue
* @param newValue
*/
attributeChangedCallback(attributeName: string, oldValue: string | null, newValue: string | null) {
super.attributeChangedCallback?.(attributeName, oldValue, newValue);
this._setAttribute(attributeName, newValue);
}
/**
* Validates that all the required properties have been set
* @param propertiesMetadata
*/
private _validateRequiredProperties(propertiesMetadata: Map<string, CustomElementPropertyMetadata>) {
const missingValueAttributes: string[] = [];
for (const [, property] of propertiesMetadata) {
const {
required,
attribute
} = property;
if (required === true &&
this.attributes[attribute] === undefined) { // The attribute for that property has not been set
missingValueAttributes.push(attribute);
}
}
if (missingValueAttributes.length > 0) {
throw Error(`The attributes: [${missingValueAttributes.join(', ')}] must have a value`)
}
}
// /**
// * Overrides the parent method to verify that it is accessing a configured property
// * @param attribute
// * @param value
// */
// setAttribute(attribute: string, value: any) {
// // Verify that the property is one of the configured in the custom element
// if ((this.constructor as any)._propertiesByAttribute[attribute] === undefined &&
// !(this.constructor as any).metadata.htmlElementProperties.has(attribute)) {
// throw Error(`There is no configured property for attribute: '${attribute}' in type: '${this.constructor.name}'`)
// }
// super.setAttribute(attribute, value);
// }
private _setAttribute(attribute: string, value: any): boolean {
if (value.startsWith(attributeMarkerPrefix)) { // Coming from a template ... ignore
return false;
}
// Verify that the property is one of the configured in the custom element
let propertyMetadata = (this.constructor as any).metadata.propertiesByAttribute.get(attribute);
const {
name,
type
} = propertyMetadata;
value = valueConverter.toProperty(value, type); // Convert from the value returned by the parameter
return this.setProperty(name, value);
}
protected setProperty(name: string, value: any): boolean {
const oldValue = this._properties[name];
if (oldValue === value) {
return false;
}
if (typeof value === 'function') {
this._properties[name] = (value as Function).bind(this);
}
else {
this._properties[name] = value;
}
// Verify that the property is one of the configured in the custom element
let propertyMetadata: CustomElementPropertyMetadata = (this.constructor as any).metadata.properties.get(name);
const {
attribute,
reflect,
//change We call change after the element was updated in the DOM
} = propertyMetadata;
const reflectOnAttribute = reflect === true ? attribute : undefined;
if (reflectOnAttribute !== undefined) { // Synchronize with the attribute of the element
value = valueConverter.toAttribute(value);
if (value === '') {
this.removeAttribute(reflectOnAttribute);
}
else {
// This will trigger the attributeChangedCallback
this.setAttribute(reflectOnAttribute, value);
}
}
this._changedProperties.set(name, (this.constructor as any).metadata.properties.get(name));
return true;
}
protected callAttributesChange() {
this._changedProperties.forEach((p, k) => {
if (p.afterUpdate !== undefined) { // Call the change function if defined
p.afterUpdate.call(this);
}
});
}
protected clearChangedProperties() {
this._changedProperties.clear();
}
}
export default AttributeChangeHandlerMixin;
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