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import { CustomEventType } from './interfaces';
import { Color, log } from './utils';
import { property } from 'lit/decorators.js';
const showUpdates = (
ele: HTMLElement,
changes: Map<PropertyKey, unknown>,
firstUpdated = false
) => {
if (ele['DEBUG_UPDATES'] || ele['DEBUG']) {
if (changes.size > 0) {
const fromto = {};
for (const key of changes.keys()) {
fromto[key] = [changes[key], ele[key]];
}
log(ele.tagName, Color.PURPLE, [
firstUpdated ? '<first-updated>' : '<updated>',
fromto
]);
}
}
};
const showEvent = (ele: HTMLElement, type: string, details = undefined) => {
if (ele['DEBUG_EVENTS'] || ele['DEBUG']) {
if (details !== undefined) {
log(ele.tagName, Color.GREEN, [type, details]);
} else {
log(ele.tagName, Color.GREEN, [type]);
}
}
};
export interface EventHandler {
event: string;
method: EventListener;
isDocument?: boolean;
isWindow?: boolean;
}
/**
* Inline handlers compiled from an element's -<event-type> attribute, keyed
* by their source. Page authors write a finite set of these, so compiling
* each one once keeps dispatch off the Function constructor entirely.
*/
const inlineHandlers = new Map<string, (event: Event) => any>();
const compileInlineHandler = (source: string): ((event: Event) => any) => {
let compiled = inlineHandlers.get(source);
if (!compiled) {
compiled = new Function(
'event',
`
with(document) {
with(this) {
let handler = ${source};
if(typeof handler === 'function') {
handler(event);
}
}
}
`
) as (event: Event) => any;
inlineHandlers.set(source, compiled);
}
return compiled;
};
export class RapidElement extends LitElement {
DEBUG = false;
DEBUG_UPDATES = false;
DEBUG_EVENTS = false;
@property({ type: String })
service: string;
private eles: { [selector: string]: HTMLDivElement } = {};
// teardowns for the listeners we installed, so disconnecting removes the
// exact functions we added
private listenerTeardowns: (() => void)[] = [];
public getEventHandlers(): EventHandler[] {
return [];
}
/**
* Adds a listener this element owns the teardown for - it is bound to this
* element and removed automatically when we disconnect. Use this instead of
* addEventListener for anything on document or window, where a listener
* that outlives its element keeps the whole element alive.
*/
public listenTo(
target: EventTarget,
event: string,
method: EventListener,
options?: AddEventListenerOptions
): void {
const bound = method.bind(this);
target.addEventListener(event, bound, options);
this.listenerTeardowns.push(() =>
target.removeEventListener(event, bound, options)
);
}
connectedCallback() {
super.connectedCallback();
for (const handler of this.getEventHandlers()) {
const target = handler.isDocument
? document
: handler.isWindow
? window
: this;
this.listenTo(target, handler.event, handler.method);
}
}
disconnectedCallback() {
this.listenerTeardowns.forEach((teardown) => teardown());
this.listenerTeardowns = [];
super.disconnectedCallback();
}
protected firstUpdated(
changes: PropertyValueMap<any> | Map<PropertyKey, unknown>
): void {
super.firstUpdated(changes);
showUpdates(this, changes, true);
}
protected updated(
changes: PropertyValueMap<any> | Map<PropertyKey, unknown>
): void {
super.updated(changes);
showUpdates(this, changes, false);
}
public getHeaders() {
if (!this.service) {
return {};
}
return {
'X-Temba-Service-Org': this.service
};
}
public fireEvent(type: string): any {
showEvent(this, type);
return this.dispatchEvent(
new Event(type, {
bubbles: true,
composed: true
})
);
}
swallowEvent(event: Event) {
event.stopPropagation();
event.preventDefault();
}
public fireCustomEvent(type: CustomEventType, detail: any = {}): any {
showEvent(this, type, detail);
const event = new CustomEvent(type, {
detail,
bubbles: true,
composed: true
});
return this.dispatchEvent(event);
}
public dispatchEvent(event: any): any {
const dispatched = super.dispatchEvent(event);
// the page can hang a handler off the target for any of our events, as a
// -<event-type> property or an attribute of the same name
const ele = event.target;
if (!ele) {
return dispatched;
}
const eventFire = (ele as any)['-' + event.type];
if (eventFire) {
return eventFire(event);
}
const inline = ele.getAttribute ? ele.getAttribute('-' + event.type) : null;
if (!inline) {
return dispatched;
}
// the compiled handler has no return value of its own, so handing its
// undefined back would read as a cancelled event - what the caller wants
// to know is whether anything called preventDefault
compileInlineHandler(inline).call(ele, event);
return dispatched;
}
public closestElement(selector: string, base: Element = this) {
function __closestFrom(el: Element | Window | Document): Element {
if (!el || el === document || el === window) return null;
if ((el as any).assignedSlot) el = (el as any).assignedSlot;
const found = (el as Element).closest(selector);
return found
? found
: __closestFrom(((el as Element).getRootNode() as ShadowRoot).host);
}
return __closestFrom(base);
}
public getDiv(selector: string) {
let ele = this.eles[selector];
if (ele) {
return ele;
}
ele = this.shadowRoot.querySelector(selector);
if (ele) {
this.eles[selector] = ele;
}
return ele;
}
public stopEvent(event: Event) {
if (event) {
event.stopPropagation();
event.preventDefault();
}
}
public isMobile() {
const win = window as any;
if (win.isMobile) {
return win.isMobile();
}
return false;
}
}
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