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51 lines
No EOL
1.3 KiB
JavaScript
51 lines
No EOL
1.3 KiB
JavaScript
fabric.Observable = {
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/**
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* @mthod observe
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* @param {String} eventName
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* @param {Function} handler
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*/
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observe: function(eventName, handler) {
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if (!this.__eventListeners) {
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this.__eventListeners = { };
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}
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if (!this.__eventListeners[eventName]) {
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this.__eventListeners[eventName] = [ ];
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}
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this.__eventListeners[eventName].push(handler);
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},
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/**
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* @mthod stopObserving
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* @memberOf fabric.util
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* @param {String} eventName
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* @param {Function} handler
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*/
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stopObserving: function(eventName, handler) {
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if (!this.__eventListeners) {
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this.__eventListeners = { };
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}
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if (this.__eventListeners[eventName]) {
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fabric.util.removeFromArray(this.__eventListeners[eventName], handler);
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}
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},
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/**
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* Fires event with an optional memo object
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* @mthod fire
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* @memberOf fabric.util
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* @param {String} eventName
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* @param {Object} [memo]
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*/
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fire: function(eventName, memo) {
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if (!this.__eventListeners) {
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this.__eventListeners = { }
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}
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var listenersForEvent = this.__eventListeners[eventName];
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if (!listenersForEvent) return;
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for (var i = 0, len = listenersForEvent.length; i < len; i++) {
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// avoiding try/catch for perf. reasons
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listenersForEvent[i]({ memo: memo });
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}
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}
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}; |