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listeners.js
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listeners.js
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const hook = require('./hook');
const {removeEventListener, addEventListener, slice, Map, Object} = require('./natives');
const handlers = new Map();
function callOnload(that, onload, args) {
if (onload) {
if (onload.handleEvent) {
return onload.handleEvent.apply(onload, args);
}
else {
return onload.apply(that, args);
}
}
}
function getAddEventListener(win, cb) {
return function(type, handler, options) {
let listener = handler;
if (type === 'load') {
if (!handlers.has(handler)) {
handlers.set(handler, function () {
hook(win, [this], cb);
const args = slice(arguments);
callOnload(this, handler, args);
});
}
listener = handlers.get(handler);
}
return addEventListener(this, type, listener, options);
}
}
function getRemoveEventListener() {
return function(type, handler, options) {
let listener = handler;
if (type === 'load') {
listener = handlers.get(handler);
handlers.delete(handler);
}
return removeEventListener(this, type, listener, options);
}
}
function hookLoadSetters(win, cb) {
Object.defineProperty(win.EventTarget.prototype, 'addEventListener', { value: getAddEventListener(win, cb) });
Object.defineProperty(win.EventTarget.prototype, 'removeEventListener', { value: getRemoveEventListener() });
}
module.exports = hookLoadSetters;