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<h1 class="file-heading">File: src\core\SignalBinding.ts</h1>
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<pre class="code prettyprint linenums">
/**
* Module - Kiwi (Core)
* @module Kiwi
*
*/
module Kiwi {
/**
* An object that represents a binding between a Signal and a listener function.
* <br />- <strong>This is an internal constructor and shouldn't be called by regular users.</strong>
* <br />- inspired by Joa Ebert AS3 SignalBinding and Robert Penner's Slot classes.
*
* Released under the MIT license
* http://millermedeiros.github.com/js-signals/
*
* @class SignalBinding
* @namespace Kiwi
*
* @author Miller Medeiros, JS Signals
* @constructor
* @internal
* @name SignalBinding
* @param signal {Kiwi.Signal} Reference to Signal object that listener is currently bound to.
* @param listener {Function} Handler function bound to the signal.
* @param isOnce {boolean} If binding should be executed just once.
* @param [listenerContext] {Object} Context on which listener will be executed (object that should represent the `this` variable inside listener function).
* @param [priority=0] {Number} The priority level of the event listener. (default = 0).
* @return {Kiwi.SignalBinding}
*/
export class SignalBinding {
constructor(signal: Signal, listener, isOnce: boolean, listenerContext, priority: number = 0) {
this._listener = listener;
this._isOnce = isOnce;
this.context = listenerContext;
this._signal = signal;
this.priority = priority || 0;
}
/**
* The type of object that this is.
* @method objType
* @return {String} "SignalBinding"
* @public
*/
public objType() {
return "SignalBinding";
}
/**
* Handler function bound to the signal.
* @property _listener
* @type Function
* @private
*/
private _listener;
/**
* If binding should be executed just once.
* @property _isOnce
* @type boolean
* @private
*/
private _isOnce: boolean;
/**
* Context on which listener will be executed (object that should represent the `this` variable inside listener function).
* @property context
* @type any
* @public
*/
public context;
/**
* Reference to Signal object that listener is currently bound to.
* @property _signal
* @type Kiwi.Signal
* @private
*/
private _signal: Signal;
/**
* Listener priority
* @property priority
* @type Number
* @public
*/
public priority: number;
/**
* If binding is active and should be executed.
* @property active
* @type boolean
* @default true
* @public
*/
public active: boolean = true;
/**
* Default parameters passed to listener during `Signal.dispatch` and `SignalBinding.execute`. (curried parameters)
* @property params
* @type Any
* @default null
* @public
*/
public params = null;
/**
* Call listener passing arbitrary parameters.
* If this binding was added using `Signal.addOnce()` it will be automatically removed from signal dispatch queue,
* this method is used internally for the signal dispatch.
*
* @method execute
* @param [paramsArr]* {Array} Array of parameters that should be passed to the listener
* @return {*} Value returned by the listener.
* @public
*/
public execute(paramsArr?: any[]) {
var handlerReturn;
var 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 this binding from the Signal it is attached to.
* Alias for 'Signal.remove()'
*
* @method detach
* @return {Function|null} Handler function bound to the signal or `null` if binding was previously detached.
* @public
*/
public detach() {
return this.isBound() ? this._signal.remove(this._listener, this.context) : null;
}
/**
* Checks to see if this Binding is still bound to a Signal and contains a listener.
* @method isBound
* @return {boolean} `true` if binding is still bound to the signal and have a listener.
* @public
*/
public isBound(): boolean {
return (!!this._signal && !!this._listener);
}
/**
* Returns a boolean indicating whether this event will be exectued just once or not.
* @method isOnce
* @return {boolean} If SignalBinding will only be executed once.
* @public
*/
public isOnce(): boolean {
return this._isOnce;
}
/**
* Returns the Handler function bound to the Signal.
* @method getListener
* @return {Function} Handler function bound to the signal.
* @public
*/
public getListener() {
return this._listener;
}
/**
* Returns the signal which this Binding is currently attached to.
* @method getSignal
* @return {Kiwi.Signal} Signal that listener is currently bound to.
* @public
*/
public getSignal() {
return this._signal;
}
/**
* Delete instance properties
* @method _destory
* @public
*/
public _destroy() {
delete this._signal;
delete this._listener;
delete this.context;
}
}
}
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