Web.Admin/2014/wordpress/wp-includes/js/customize-base.js
window.wp = window.wp || {};
(function( exports, $ ){
var api, extend, ctor, inherits,
slice = Array.prototype.slice;
/* =====================================================================
* Micro-inheritance - thank you, backbone.js.
* ===================================================================== */
extend = function( protoProps, classProps ) {
var child = inherits( this, protoProps, classProps );
child.extend = this.extend;
return child;
};
// Shared empty constructor function to aid in prototype-chain creation.
ctor = function() {};
// Helper function to correctly set up the prototype chain, for subclasses.
// Similar to `goog.inherits`, but uses a hash of prototype properties and
// class properties to be extended.
inherits = function( parent, protoProps, staticProps ) {
var child;
// The constructor function for the new subclass is either defined by you
// (the "constructor" property in your `extend` definition), or defaulted
// by us to simply call `super()`.
if ( protoProps && protoProps.hasOwnProperty( 'constructor' ) ) {
child = protoProps.constructor;
} else {
child = function() {
// Storing the result `super()` before returning the value
// prevents a bug in Opera where, if the constructor returns
// a function, Opera will reject the return value in favor of
// the original object. This causes all sorts of trouble.
var result = parent.apply( this, arguments );
return result;
};
}
// Inherit class (static) properties from parent.
$.extend( child, parent );
// Set the prototype chain to inherit from `parent`, without calling
// `parent`'s constructor function.
ctor.prototype = parent.prototype;
child.prototype = new ctor();
// Add prototype properties (instance properties) to the subclass,
// if supplied.
if ( protoProps )
$.extend( child.prototype, protoProps );
// Add static properties to the constructor function, if supplied.
if ( staticProps )
$.extend( child, staticProps );
// Correctly set child's `prototype.constructor`.
child.prototype.constructor = child;
// Set a convenience property in case the parent's prototype is needed later.
child.__super__ = parent.prototype;
return child;
};
api = {};
/* =====================================================================
* Base class.
* ===================================================================== */
api.Class = function( applicator, argsArray, options ) {
var magic, args = arguments;
if ( applicator && argsArray && api.Class.applicator === applicator ) {
args = argsArray;
$.extend( this, options || {} );
}
magic = this;
if ( this.instance ) {
magic = function() {
return magic.instance.apply( magic, arguments );
};
$.extend( magic, this );
}
magic.initialize.apply( magic, args );
return magic;
};
api.Class.applicator = {};
api.Class.prototype.initialize = function() {};
/*
* Checks whether a given instance extended a constructor.
*
* The magic surrounding the instance parameter causes the instanceof
* keyword to return inaccurate results; it defaults to the function's
* prototype instead of the constructor chain. Hence this function.
*/
api.Class.prototype.extended = function( constructor ) {
var proto = this;
while ( typeof proto.constructor !== 'undefined' ) {
if ( proto.constructor === constructor )
return true;
if ( typeof proto.constructor.__super__ === 'undefined' )
return false;
proto = proto.constructor.__super__;
}
return false;
};
api.Class.extend = extend;
/* =====================================================================
* Events mixin.
* ===================================================================== */
api.Events = {
trigger: function( id ) {
if ( this.topics && this.topics[ id ] )
this.topics[ id ].fireWith( this, slice.call( arguments, 1 ) );
return this;
},
bind: function( id ) {
this.topics = this.topics || {};
this.topics[ id ] = this.topics[ id ] || $.Callbacks();
this.topics[ id ].add.apply( this.topics[ id ], slice.call( arguments, 1 ) );
return this;
},
unbind: function( id ) {
if ( this.topics && this.topics[ id ] )
this.topics[ id ].remove.apply( this.topics[ id ], slice.call( arguments, 1 ) );
return this;
}
};
/* =====================================================================
* Observable values that support two-way binding.
* ===================================================================== */
api.Value = api.Class.extend({
initialize: function( initial, options ) {
this._value = initial; // @todo: potentially change this to a this.set() call.
this.callbacks = $.Callbacks();
$.extend( this, options || {} );
this.set = $.proxy( this.set, this );
},
/*
* Magic. Returns a function that will become the instance.
* Set to null to prevent the instance from extending a function.
*/
instance: function() {
return arguments.length ? this.set.apply( this, arguments ) : this.get();
},
get: function() {
return this._value;
},
set: function( to ) {
var from = this._value;
to = this._setter.apply( this, arguments );
to = this.validate( to );
// Bail if the sanitized value is null or unchanged.
if ( null === to || this._value === to )
return this;
this._value = to;
this.callbacks.fireWith( this, [ to, from ] );
return this;
},
_setter: function( to ) {
return to;
},
setter: function( callback ) {
var from = this.get();
this._setter = callback;
// Temporarily clear value so setter can decide if it's valid.
this._value = null;
this.set( from );
return this;
},
resetSetter: function() {
this._setter = this.constructor.prototype._setter;
this.set( this.get() );
return this;
},
validate: function( value ) {
return value;
},
bind: function() {
this.callbacks.add.apply( this.callbacks, arguments );
return this;
},
unbind: function() {
this.callbacks.remove.apply( this.callbacks, arguments );
return this;
},
link: function() { // values*
var set = this.set;
$.each( arguments, function() {
this.bind( set );
});
return this;
},
unlink: function() { // values*
var set = this.set;
$.each( arguments, function() {
this.unbind( set );
});
return this;
},
sync: function() { // values*
var that = this;
$.each( arguments, function() {
that.link( this );
this.link( that );
});
return this;
},
unsync: function() { // values*
var that = this;
$.each( arguments, function() {
that.unlink( this );
this.unlink( that );
});
return this;
}
});
/* =====================================================================
* A collection of observable values.
* ===================================================================== */
api.Values = api.Class.extend({
defaultConstructor: api.Value,
initialize: function( options ) {
$.extend( this, options || {} );
this._value = {};
this._deferreds = {};
},
instance: function( id ) {
if ( arguments.length === 1 )
return this.value( id );
return this.when.apply( this, arguments );
},
value: function( id ) {
return this._value[ id ];
},
has: function( id ) {
return typeof this._value[ id ] !== 'undefined';
},
add: function( id, value ) {
if ( this.has( id ) )
return this.value( id );
this._value[ id ] = value;
value.parent = this;
if ( value.extended( api.Value ) )
value.bind( this._change );
this.trigger( 'add', value );
if ( this._deferreds[ id ] )
this._deferreds[ id ].resolve();
return this._value[ id ];
},
create: function( id ) {
return this.add( id, new this.defaultConstructor( api.Class.applicator, slice.call( arguments, 1 ) ) );
},
each: function( callback, context ) {
context = typeof context === 'undefined' ? this : context;
$.each( this._value, function( key, obj ) {
callback.call( context, obj, key );
});
},
remove: function( id ) {
var value;
if ( this.has( id ) ) {
value = this.value( id );
this.trigger( 'remove', value );
if ( value.extended( api.Value ) )
value.unbind( this._change );
delete value.parent;
}
delete this._value[ id ];
delete this._deferreds[ id ];
},
/**
* Runs a callback once all requested values exist.
*
* when( ids*, [callback] );
*
* For example:
* when( id1, id2, id3, function( value1, value2, value3 ) {} );
*
* @returns $.Deferred.promise();
*/
when: function() {
var self = this,
ids = slice.call( arguments ),
dfd = $.Deferred();
// If the last argument is a callback, bind it to .done()
if ( $.isFunction( ids[ ids.length - 1 ] ) )
dfd.done( ids.pop() );
$.when.apply( $, $.map( ids, function( id ) {
if ( self.has( id ) )
return;
return self._deferreds[ id ] = self._deferreds[ id ] || $.Deferred();
})).done( function() {
var values = $.map( ids, function( id ) {
return self( id );
});
// If a value is missing, we've used at least one expired deferred.
// Call Values.when again to generate a new deferred.
if ( values.length !== ids.length ) {
// ids.push( callback );
self.when.apply( self, ids ).done( function() {
dfd.resolveWith( self, values );
});
return;
}
dfd.resolveWith( self, values );
});
return dfd.promise();
},
_change: function() {
this.parent.trigger( 'change', this );
}
});
$.extend( api.Values.prototype, api.Events );
/* =====================================================================
* An observable value that syncs with an element.
*
* Handles inputs, selects, and textareas by default.
* ===================================================================== */
api.ensure = function( element ) {
return typeof element == 'string' ? $( element ) : element;
};
api.Element = api.Value.extend({
initialize: function( element, options ) {
var self = this,
synchronizer = api.Element.synchronizer.html,
type, update, refresh;
this.element = api.ensure( element );
this.events = '';
if ( this.element.is('input, select, textarea') ) {
this.events += 'change';
synchronizer = api.Element.synchronizer.val;
if ( this.element.is('input') ) {
type = this.element.prop('type');
if ( api.Element.synchronizer[ type ] )
synchronizer = api.Element.synchronizer[ type ];
if ( 'text' === type || 'password' === type )
this.events += ' keyup';
} else if ( this.element.is('textarea') ) {
this.events += ' keyup';
}
}
api.Value.prototype.initialize.call( this, null, $.extend( options || {}, synchronizer ) );
this._value = this.get();
update = this.update;
refresh = this.refresh;
this.update = function( to ) {
if ( to !== refresh.call( self ) )
update.apply( this, arguments );
};
this.refresh = function() {
self.set( refresh.call( self ) );
};
this.bind( this.update );
this.element.bind( this.events, this.refresh );
},
find: function( selector ) {
return $( selector, this.element );
},
refresh: function() {},
update: function() {}
});
api.Element.synchronizer = {};
$.each( [ 'html', 'val' ], function( i, method ) {
api.Element.synchronizer[ method ] = {
update: function( to ) {
this.element[ method ]( to );
},
refresh: function() {
return this.element[ method ]();
}
};
});
api.Element.synchronizer.checkbox = {
update: function( to ) {
this.element.prop( 'checked', to );
},
refresh: function() {
return this.element.prop( 'checked' );
}
};
api.Element.synchronizer.radio = {
update: function( to ) {
this.element.filter( function() {
return this.value === to;
}).prop( 'checked', true );
},
refresh: function() {
return this.element.filter( ':checked' ).val();
}
};
/* =====================================================================
* Messenger for postMessage.
* ===================================================================== */
$.support.postMessage = !! window.postMessage;
api.Messenger = api.Class.extend({
add: function( key, initial, options ) {
return this[ key ] = new api.Value( initial, options );
},
/**
* Initialize Messenger.
*
* @param {object} params Parameters to configure the messenger.
* {string} .url The URL to communicate with.
* {window} .targetWindow The window instance to communicate with. Default window.parent.
* {string} .channel If provided, will send the channel with each message and only accept messages a matching channel.
* @param {object} options Extend any instance parameter or method with this object.
*/
initialize: function( params, options ) {
// Target the parent frame by default, but only if a parent frame exists.
var defaultTarget = window.parent == window ? null : window.parent;
$.extend( this, options || {} );
this.add( 'channel', params.channel );
this.add( 'url', params.url || '' );
this.add( 'targetWindow', params.targetWindow || defaultTarget );
this.add( 'origin', this.url() ).link( this.url ).setter( function( to ) {
return to.replace( /([^:]+:\/\/[^\/]+).*/, '$1' );
});
// Since we want jQuery to treat the receive function as unique
// to this instance, we give the function a new guid.
//
// This will prevent every Messenger's receive function from being
// unbound when calling $.off( 'message', this.receive );
this.receive = $.proxy( this.receive, this );
this.receive.guid = $.guid++;
$( window ).on( 'message', this.receive );
},
destroy: function() {
$( window ).off( 'message', this.receive );
},
receive: function( event ) {
var message;
event = event.originalEvent;
if ( ! this.targetWindow() )
return;
// Check to make sure the origin is valid.
if ( this.origin() && event.origin !== this.origin() )
return;
// Ensure we have a string that's JSON.parse-able
if ( typeof event.data !== 'string' || event.data[0] !== '{' ) {
return;
}
message = JSON.parse( event.data );
// Check required message properties.
if ( ! message || ! message.id || typeof message.data === 'undefined' )
return;
// Check if channel names match.
if ( ( message.channel || this.channel() ) && this.channel() !== message.channel )
return;
this.trigger( message.id, message.data );
},
send: function( id, data ) {
var message;
data = typeof data === 'undefined' ? null : data;
if ( ! this.url() || ! this.targetWindow() )
return;
message = { id: id, data: data };
if ( this.channel() )
message.channel = this.channel();
this.targetWindow().postMessage( JSON.stringify( message ), this.origin() );
}
});
// Add the Events mixin to api.Messenger.
$.extend( api.Messenger.prototype, api.Events );
/* =====================================================================
* Core customize object.
* ===================================================================== */
api = $.extend( new api.Values(), api );
api.get = function() {
var result = {};
this.each( function( obj, key ) {
result[ key ] = obj.get();
});
return result;
};
// Expose the API to the world.
exports.customize = api;
})( wp, jQuery );