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class EventElement {
constructor(element) {
this.element = element;
this.handlers = {};
}
bind(eventName, handler) {
if (typeof this.handlers[eventName] === 'undefined') {
this.handlers[eventName] = [];
}
this.handlers[eventName].push(handler);
this.element.addEventListener(eventName, handler, false);
}
unbind(eventName, target) {
this.handlers[eventName] = this.handlers[eventName].filter(handler => {
if (target && handler !== target) {
return true;
}
this.element.removeEventListener(eventName, handler, false);
return false;
});
}
unbindAll() {
for (const name in this.handlers) {
this.unbind(name);
}
}
get isEmpty() {
return Object.keys(this.handlers).every(
key => this.handlers[key].length === 0
);
}
}
export default class EventManager {
constructor() {
this.eventElements = [];
}
eventElement(element) {
let ee = this.eventElements.filter(ee => ee.element === element)[0];
if (!ee) {
ee = new EventElement(element);
this.eventElements.push(ee);
}
return ee;
}
bind(element, eventName, handler) {
this.eventElement(element).bind(eventName, handler);
}
unbind(element, eventName, handler) {
const ee = this.eventElement(element);
ee.unbind(eventName, handler);
if (ee.isEmpty) {
// remove
this.eventElements.splice(this.eventElements.indexOf(ee), 1);
}
}
unbindAll() {
this.eventElements.forEach(e => e.unbindAll());
this.eventElements = [];
}
once(element, eventName, handler) {
const ee = this.eventElement(element);
const onceHandler = evt => {
ee.unbind(eventName, onceHandler);
handler(evt);
};
ee.bind(eventName, onceHandler);
}
}