root / HServer / 00.Server / 00.Program / node_modules / component-emitter / index.js
이력 | 보기 | 이력해설 | 다운로드 (3.11 KB)
| 1 | 39 | HKM | |
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| 2 | /**
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| 3 | * Expose `Emitter`.
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| 4 | */
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| 5 | |||
| 6 | if (typeof module !== 'undefined') { |
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| 7 | module.exports = Emitter; |
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| 8 | } |
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| 9 | |||
| 10 | /**
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| 11 | * Initialize a new `Emitter`.
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| 12 | *
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| 13 | * @api public
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| 14 | */
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| 15 | |||
| 16 | function Emitter(obj) { |
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| 17 | if (obj) return mixin(obj); |
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| 18 | }; |
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| 19 | |||
| 20 | /**
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| 21 | * Mixin the emitter properties.
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| 22 | *
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| 23 | * @param {Object} obj
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| 24 | * @return {Object}
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| 25 | * @api private
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| 26 | */
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| 27 | |||
| 28 | function mixin(obj) { |
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| 29 | for (var key in Emitter.prototype) { |
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| 30 | obj[key] = Emitter.prototype[key]; |
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| 31 | } |
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| 32 | return obj;
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| 33 | } |
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| 34 | |||
| 35 | /**
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| 36 | * Listen on the given `event` with `fn`.
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| 37 | *
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| 38 | * @param {String} event
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| 39 | * @param {Function} fn
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| 40 | * @return {Emitter}
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| 41 | * @api public
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| 42 | */
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| 43 | |||
| 44 | Emitter.prototype.on = |
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| 45 | Emitter.prototype.addEventListener = function(event, fn){ |
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| 46 | this._callbacks = this._callbacks || {}; |
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| 47 | (this._callbacks['$' + event] = this._callbacks['$' + event] || []) |
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| 48 | .push(fn); |
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| 49 | return this; |
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| 50 | }; |
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| 51 | |||
| 52 | /**
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| 53 | * Adds an `event` listener that will be invoked a single
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| 54 | * time then automatically removed.
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| 55 | *
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| 56 | * @param {String} event
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| 57 | * @param {Function} fn
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| 58 | * @return {Emitter}
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| 59 | * @api public
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| 60 | */
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| 61 | |||
| 62 | Emitter.prototype.once = function(event, fn){ |
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| 63 | function on() { |
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| 64 | this.off(event, on);
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| 65 | fn.apply(this, arguments); |
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| 66 | } |
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| 67 | |||
| 68 | on.fn = fn; |
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| 69 | this.on(event, on);
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| 70 | return this; |
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| 71 | }; |
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| 72 | |||
| 73 | /**
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| 74 | * Remove the given callback for `event` or all
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| 75 | * registered callbacks.
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| 76 | *
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| 77 | * @param {String} event
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| 78 | * @param {Function} fn
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| 79 | * @return {Emitter}
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| 80 | * @api public
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| 81 | */
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| 82 | |||
| 83 | Emitter.prototype.off = |
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| 84 | Emitter.prototype.removeListener = |
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| 85 | Emitter.prototype.removeAllListeners = |
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| 86 | Emitter.prototype.removeEventListener = function(event, fn){ |
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| 87 | this._callbacks = this._callbacks || {}; |
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| 88 | |||
| 89 | // all
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| 90 | if (0 == arguments.length) { |
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| 91 | this._callbacks = {};
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| 92 | return this; |
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| 93 | } |
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| 94 | |||
| 95 | // specific event
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| 96 | var callbacks = this._callbacks['$' + event]; |
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| 97 | if (!callbacks) return this; |
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| 98 | |||
| 99 | // remove all handlers
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| 100 | if (1 == arguments.length) { |
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| 101 | delete this._callbacks['$' + event]; |
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| 102 | return this; |
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| 103 | } |
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| 104 | |||
| 105 | // remove specific handler
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| 106 | var cb;
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| 107 | for (var i = 0; i < callbacks.length; i++) { |
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| 108 | cb = callbacks[i]; |
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| 109 | if (cb === fn || cb.fn === fn) {
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| 110 | callbacks.splice(i, 1);
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| 111 | break;
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| 112 | } |
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| 113 | } |
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| 114 | return this; |
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| 115 | }; |
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| 116 | |||
| 117 | /**
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| 118 | * Emit `event` with the given args.
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| 119 | *
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| 120 | * @param {String} event
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| 121 | * @param {Mixed} ...
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| 122 | * @return {Emitter}
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| 123 | */
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| 124 | |||
| 125 | Emitter.prototype.emit = function(event){ |
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| 126 | this._callbacks = this._callbacks || {}; |
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| 127 | var args = [].slice.call(arguments, 1) |
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| 128 | , callbacks = this._callbacks['$' + event]; |
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| 129 | |||
| 130 | if (callbacks) {
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| 131 | callbacks = callbacks.slice(0);
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| 132 | for (var i = 0, len = callbacks.length; i < len; ++i) { |
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| 133 | callbacks[i].apply(this, args);
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| 134 | } |
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| 135 | } |
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| 136 | |||
| 137 | return this; |
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| 138 | }; |
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| 139 | |||
| 140 | /**
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| 141 | * Return array of callbacks for `event`.
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| 142 | *
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| 143 | * @param {String} event
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| 144 | * @return {Array}
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| 145 | * @api public
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| 146 | */
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| 147 | |||
| 148 | Emitter.prototype.listeners = function(event){ |
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| 149 | this._callbacks = this._callbacks || {}; |
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| 150 | return this._callbacks['$' + event] || []; |
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| 151 | }; |
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| 152 | |||
| 153 | /**
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| 154 | * Check if this emitter has `event` handlers.
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| 155 | *
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| 156 | * @param {String} event
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| 157 | * @return {Boolean}
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| 158 | * @api public
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| 159 | */
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| 160 | |||
| 161 | Emitter.prototype.hasListeners = function(event){ |
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| 162 | return !! this.listeners(event).length; |
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| 163 | }; |