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