40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
PDFJS.Reader.EventBus = function () {
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this._listeners = Object.create(null);
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return this;
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};
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PDFJS.Reader.EventBus.prototype.on = function (eventName, listener) {
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var eventListeners = this._listeners[eventName];
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if (!eventListeners) {
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eventListeners = [];
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this._listeners[eventName] = eventListeners;
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}
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eventListeners.push(listener);
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};
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PDFJS.Reader.EventBus.prototype.off = function (eventName, listener) {
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var eventListeners = this._listeners[eventName];
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var i;
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if (!eventListeners || ((i = eventListeners.indexOf(listener)) < 0)) {
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return;
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}
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eventListeners.splice(i, 1);
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};
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PDFJS.Reader.EventBus.prototype.dispatch = function (eventName) {
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var eventListeners = this._listeners[eventName];
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if (!eventListeners || eventListeners.length === 0) {
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return;
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}
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// Passing all arguments after the eventName to the listeners.
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var args = Array.prototype.slice.call(arguments, 1);
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// Making copy of the listeners array in case if it will be modified
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// during dispatch.
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eventListeners.slice(0).forEach(function (listener) {
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listener.apply(null, args);
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});
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};
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