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< h1 class = "page-title" > Source: core/SignalBinding.js< / h1 >
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< pre class = "sunlight-highlight-javascript linenums" > /**
* @author Richard Davey < rich@photonstorm.com>
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* @copyright 2014 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* Phaser.SignalBinding
*
* Object that represents a binding between a Signal and a listener function.
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* This is an internal constructor and shouldn't be called by regular users.
* Inspired by Joa Ebert AS3 SignalBinding and Robert Penner's Slot classes.
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*
* @class Phaser.SignalBinding
* @name SignalBinding
* @author Miller Medeiros http://millermedeiros.github.com/js-signals/
* @constructor
* @inner
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* @param {Phaser.Signal} signal - Reference to Signal object that listener is currently bound to.
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* @param {function} listener - Handler function bound to the signal.
* @param {boolean} isOnce - If binding should be executed just once.
* @param {object} [listenerContext] - Context on which listener will be executed (object that should represent the `this` variable inside listener function).
* @param {number} [priority] - The priority level of the event listener. (default = 0).
*/
Phaser.SignalBinding = function (signal, listener, isOnce, listenerContext, priority) {
/**
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* @property {Phaser.Game} _listener - Handler function bound to the signal.
* @private
*/
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this._listener = listener;
/**
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* @property {boolean} _isOnce - If binding should be executed just once.
* @private
*/
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this._isOnce = isOnce;
/**
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* @property {object|undefined|null} context - Context on which listener will be executed (object that should represent the `this` variable inside listener function).
* @memberof SignalBinding.prototype
*/
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this.context = listenerContext;
/**
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* @property {Phaser.Signal} _signal - Reference to Signal object that listener is currently bound to.
* @private
*/
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this._signal = signal;
/**
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* @property {number} _priority - Listener priority.
* @private
*/
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this._priority = priority || 0;
};
Phaser.SignalBinding.prototype = {
/**
* If binding is active and should be executed.
* @property {boolean} active
* @default
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*/
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active: true,
/**
* Default parameters passed to listener during `Signal.dispatch` and `SignalBinding.execute` (curried parameters).
* @property {array|null} params
* @default
*/
params: null,
/**
* Call listener passing arbitrary parameters.
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* If binding was added using `Signal.addOnce()` it will be automatically removed from signal dispatch queue, this method is used internally for the signal dispatch.
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* @method Phaser.SignalBinding#execute
* @param {array} [paramsArr] - Array of parameters that should be passed to the listener.
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* @return {any} Value returned by the listener.
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*/
execute: function (paramsArr) {
var handlerReturn, params;
if (this.active & & !!this._listener)
{
params = this.params? this.params.concat(paramsArr) : paramsArr;
handlerReturn = this._listener.apply(this.context, params);
if (this._isOnce)
{
this.detach();
}
}
return handlerReturn;
},
/**
* Detach binding from signal.
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* alias to: @see mySignal.remove(myBinding.getListener());
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* @method Phaser.SignalBinding#detach
* @return {function|null} Handler function bound to the signal or `null` if binding was previously detached.
*/
detach: function () {
return this.isBound() ? this._signal.remove(this._listener, this.context) : null;
},
/**
* @method Phaser.SignalBinding#isBound
* @return {boolean} True if binding is still bound to the signal and has a listener.
*/
isBound: function () {
return (!!this._signal & & !!this._listener);
},
/**
* @method Phaser.SignalBinding#isOnce
* @return {boolean} If SignalBinding will only be executed once.
*/
isOnce: function () {
return this._isOnce;
},
/**
* @method Phaser.SignalBinding#getListener
* @return {Function} Handler function bound to the signal.
*/
getListener: function () {
return this._listener;
},
/**
* @method Phaser.SignalBinding#getSignal
* @return {Signal} Signal that listener is currently bound to.
*/
getSignal: function () {
return this._signal;
},
/**
* @method Phaser.SignalBinding#_destroy
* Delete instance properties
* @private
*/
_destroy: function () {
delete this._signal;
delete this._listener;
delete this.context;
},
/**
* @method Phaser.SignalBinding#toString
* @return {string} String representation of the object.
*/
toString: function () {
return '[Phaser.SignalBinding isOnce:' + this._isOnce +', isBound:'+ this.isBound() +', active:' + this.active + ']';
}
};
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Phaser.SignalBinding.prototype.constructor = Phaser.SignalBinding;
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