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* @module Utils
*/
import * as MC from "@lisn/globals/minification-constants";
import * as MH from "@lisn/globals/minification-helpers";
import { addClasses, removeClasses } from "@lisn/utils/css-alter";
import { copyExistingKeys } from "@lisn/utils/misc";
import { XMap, newXMapGetter, newXWeakMap } from "@lisn/modules/x-map";
/**
* Calls the given event listener, which could be a function that's callable
* directly, or an object that has a `handleEvent` function property.
*
* @category Events: Generic
*/
export const callEventListener = (
handler: EventListenerOrEventListenerObject,
event: Event,
) => {
if (MH.isFunction(handler)) {
handler.call(event.currentTarget ?? self, event);
} else E{
handler.handleEvent.call(event.currentTarget ?? self, event);
}
};
/**
* Adds an event listener for the given event name to the given target.
*
* Like {@link https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener | EventTarget:addEventListener}
* but it handles `options` object in case the browser does not support those.
* Does not support the `signal` option unless browser natively supports that.
*
* @returns `true` if successfully added, or `false` if the same handler has
* already been added by us, or if the handler is not a valid event listener.
*
* @category Events: Generic
*/
export const addEventListenerTo = (
target: EventTarget,
eventType: string,
handler: EventListenerOrEventListenerObject,
options?: boolean | AddEventListenerOptions,
): boolean => {
options ??= false;
eventType = transformEventType(eventType);
if (getEventHandlerData(target, eventType, handler, options)) {
// already added
return false;
}
let thirdArg = options;
let wrappedHandler = handler;
// If the user passed an options object but the browser only supports a
// boolen for 'useCapture', then handle this.
const supports = getBrowserSupport();
if (MH.isNonPrimitive(options)) {
if (!supports._optionsArg) {
thirdArg = options.capture ?? false;
}
if (options.once && !supports._options.once) {
// Remove the handler once it's called once
wrappedHandler = (event) => {
removeEventListenerFrom(target, eventType, handler, options);
callEventListener(handler, event);
};
}
}
setEventHandlerData(target, eventType, handler, options, {
_wrappedHandler: wrappedHandler,
_thirdArg: thirdArg,
});
target.addEventListener(eventType, wrappedHandler, thirdArg);
return true;
};
/**
* Removes an event listener that has been added using
* {@link addEventListenerTo}.
*
* **IMPORTANT:** If you have added a listener using the built-in
* {@link https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener | EventTarget:addEventListener},
* then you should use
* {@link https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener | EventTarget:removeEventListener},
* to remove it, not this function.
*
* @returns `true` if successfully removed, or `false` if the handler has not
* been added by us.
*
* @category Events: Generic
*/
export const removeEventListenerFrom = (
target: EventTarget,
eventType: string,
handler: EventListenerOrEventListenerObject,
options?: boolean | AddEventListenerOptions,
) => {
options ??= false;
eventType = transformEventType(eventType);
const data = getEventHandlerData(target, eventType, handler, options);
if (!data) {
return false;
}
target.removeEventListener(eventType, data._wrappedHandler, data._thirdArg);
deleteEventHandlerData(target, eventType, handler, options);
return true;
};
/**
* @ignore
* @internal
*/
export const preventSelect = (target: EventTarget) => {
addEventListenerTo(target, MC.S_SELECTSTART, MH.preventDefault);
if (MH.isElement(target)) {
addClasses(target, MC.PREFIX_NO_SELECT);
}
};
/**
* @ignore
* @internal
*/
export const undoPreventSelect = (target: EventTarget) => {
removeEventListenerFrom(target, MC.S_SELECTSTART, MH.preventDefault);
if (MH.isElement(target)) {
removeClasses(target, MC.PREFIX_NO_SELECT);
}
};
/**
* @ignore
* @internal
*/
export const getBrowserSupport = (): BrowserEventSupport => {
if (browserEventSupport) {
// already detected
return browserEventSupport;
}
const supports = {
_pointer: false,
_optionsArg: false,
_options: {
capture: false,
passive: false,
once: false,
signal: false,
},
};
// https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#safely_detecting_option_support
const optTest = {};
let opt: keyof typeof supports._options;
for (opt in supports._options) {
const thisOpt = opt;
MH.defineProperty(optTest, thisOpt, {
get: () => {
supports._options[thisOpt] = true;
if (thisOpt === "signal") {
return new AbortController().signal;
}
return false;
},
});
}
const dummyHandler = () => {}; // TypeScript does not accept null
const dummyElement = MH.createElement("div");
try {
dummyElement.addEventListener("testOptionSupport", dummyHandler, optTest);
dummyElement.removeEventListener(
"testOptionSupport",
dummyHandler,
optTest,
);
supports._optionsArg = true;
} catch (e__ignored) {
//
}
supports._pointer = "onpointerup" in dummyElement;
browserEventSupport = supports;
return supports;
};
// --------------------
type EventHandlerData = {
_wrappedHandler: EventListenerOrEventListenerObject;
_thirdArg: boolean | AddEventListenerOptions;
};
let browserEventSupport: BrowserEventSupport;
const registeredEventHandlerData = newXWeakMap<
EventTarget,
XMap<
string, // event type
XMap<
EventListenerOrEventListenerObject, // user-supplied handler
Map<
string, // str repr of options
EventHandlerData
>
>
>
>(newXMapGetter(newXMapGetter(() => MH.newMap())));
// detect browser features, see below
type BrowserEventSupport = {
_pointer: boolean;
_optionsArg: boolean;
_options: {
capture: boolean;
passive: boolean;
once: boolean;
signal: boolean;
};
};
const getEventOptionsStr = (
options: boolean | AddEventListenerOptions,
): string => {
const finalOptions: AddEventListenerOptions = {
capture: false,
passive: false,
once: false,
};
if (options === false || options === true) {
finalOptions.capture = options;
} else if (MH.isObject(options)) {
copyExistingKeys(options, finalOptions);
}
return MH.stringify(finalOptions);
};
const getEventHandlerData = (
target: EventTarget,
eventType: string,
handler: EventListenerOrEventListenerObject,
options: boolean | AddEventListenerOptions,
) => {
const optionsStr = getEventOptionsStr(options);
return registeredEventHandlerData
.get(target)
?.get(eventType)
?.get(handler)
?.get(optionsStr);
};
const deleteEventHandlerData = (
target: EventTarget,
eventType: string,
handler: EventListenerOrEventListenerObject,
options: boolean | AddEventListenerOptions,
) => {
const optionsStr = getEventOptionsStr(options);
MH.deleteKey(
registeredEventHandlerData.get(target)?.get(eventType)?.get(handler),
optionsStr,
);
registeredEventHandlerData.prune(target, eventType, handler);
};
const setEventHandlerData = (
target: EventTarget,
eventType: string,
handler: EventListenerOrEventListenerObject,
options: boolean | AddEventListenerOptions,
data: EventHandlerData,
) => {
const optionsStr = getEventOptionsStr(options);
registeredEventHandlerData
.sGet(target)
.sGet(eventType)
.sGet(handler)
.set(optionsStr, data);
};
const transformEventType = (eventType: string) => {
const supports = getBrowserSupport();
if (eventType.startsWith(MC.S_POINTER) && !supports._pointer) {
// TODO maybe log a warning message is it's not supported, e.g. there's no
// mousecancel
return MH.strReplace(eventType, MC.S_POINTER, MC.S_MOUSE);
}
return eventType;
};
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