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/**
* Copyright 2010-2013 Ben Birch
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this software except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
(function( app ) {
var ux = app.ns("ux");
ux.Observable = ux.Class.extend((function() {
return {
init: function() {
this.observers = {};
for( var opt in this.config ) { // automatically install observers that are defined in the configuration
if( opt.indexOf( 'on' ) === 0 ) {
this.on( opt.substring(2) , this.config[ opt ] );
}
}
},
_getObs: function( type ) {
return ( this.observers[ type.toLowerCase() ] || ( this.observers[ type.toLowerCase() ] = [] ) );
},
on: function( type, fn, params, thisp ) {
this._getObs( type ).push( { "cb" : fn, "args" : params || [] , "cx" : thisp || this } );
return this;
},
fire: function( type ) {
var params = Array.prototype.slice.call( arguments, 1 );
this._getObs( type ).slice().forEach( function( ob ) {
ob["cb"].apply( ob["cx"], ob["args"].concat( params ) );
} );
return this;
},
removeAllObservers: function() {
this.observers = {};
},
removeObserver: function( type, fn ) {
var obs = this._getObs( type ),
index = obs.reduce( function(p, t, i) { return (t.cb === fn) ? i : p; }, -1 );
if(index !== -1) {
obs.splice( index, 1 );
}
return this; // make observable functions chainable
},
hasObserver: function( type ) {
return !! this._getObs( type ).length;
}
};
})());
})( this.app );
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