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48 lines
1.3 KiB
JavaScript
48 lines
1.3 KiB
JavaScript
8 years ago
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export default new class {
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constructor() {
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this.listeners = new Map();
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}
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addListener(label, callback, vm) {
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if(typeof callback == 'function'){
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this.listeners.has(label) || this.listeners.set(label, []);
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this.listeners.get(label).push({callback: callback, vm: vm});
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return true
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}
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return false
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}
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removeListener(label, callback, vm) {
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let listeners = this.listeners.get(label),
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index;
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if (listeners && listeners.length) {
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index = listeners.reduce((i, listener, index) => {
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return (typeof listener.callback == 'function' && listener.callback === callback && listener.vm == vm) ?
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i = index :
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i;
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}, -1);
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if (index > -1) {
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listeners.splice(index, 1);
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this.listeners.set(label, listeners);
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return true;
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}
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}
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return false;
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}
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emit(label, ...args) {
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let listeners = this.listeners.get(label);
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if (listeners && listeners.length) {
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listeners.forEach((listener) => {
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listener.callback.call(listener.vm,...args)
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});
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return true;
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}
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return false;
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}
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}
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