494 lines
12 KiB
JavaScript
494 lines
12 KiB
JavaScript
if ( typeof wp === 'undefined' )
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var wp = {};
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(function( exports, $ ){
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var api, extend, ctor, inherits, ready,
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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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/* =====================================================================
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* customize function.
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* ===================================================================== */
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ready = $.Callbacks( 'once memory' );
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/*
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* Sugar for main customize function. Supports several signatures.
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*
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* customize( callback, [context] );
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* Binds a callback to be fired when the customizer is ready.
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* - callback, function
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* - context, object
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*
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* customize( setting );
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* Fetches a setting object by ID.
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* - setting, string - The setting ID.
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*
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*/
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api = {};
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// api = function( callback, context ) {
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// if ( $.isFunction( callback ) ) {
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// if ( context )
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// callback = $.proxy( callback, context );
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// ready.add( callback );
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//
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// return api;
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// }
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// }
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/* =====================================================================
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* Base class.
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* ===================================================================== */
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api.Class = function( applicator, argsArray, options ) {
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var magic, args = arguments;
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if ( applicator && argsArray && api.Class.applicator === applicator ) {
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args = argsArray;
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$.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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* Light 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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},
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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.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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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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/*
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* Allows the creation of composite values.
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* Overrides the native link method (can be reverted with `unlink`).
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*/
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link: function() {
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var keys = slice.call( arguments ),
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callback = keys.pop(),
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self = this,
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set, key, active;
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if ( this.links )
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this.unlink();
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this.links = [];
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// Single argument means a direct binding.
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if ( ! keys.length ) {
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keys = [ callback ];
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callback = function( value, to ) {
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return to;
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};
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}
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while ( key = keys.shift() ) {
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if ( this._parent && $.type( key ) == 'string' )
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this.links.push( this._parent[ key ] );
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else
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this.links.push( key );
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}
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// Replace this.set with the assignment function.
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set = function() {
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var args, result;
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// If we call set from within the assignment function,
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// pass the arguments to the original set.
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if ( active )
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return self.set.original.apply( self, arguments );
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active = true;
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args = self.links.concat( slice.call( arguments ) );
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result = callback.apply( self, args );
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active = false;
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if ( typeof result !== 'undefined' )
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self.set.original.call( self, result );
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};
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set.original = this.set;
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this.set = set;
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// Bind the new function to the master values.
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$.each( this.links, function( key, value ) {
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value.bind( self.set );
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});
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this.set( this.get() );
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return this;
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},
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unlink: function() {
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var set = this.set;
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$.each( this.links, function( key, value ) {
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value.unbind( set );
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});
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delete this.links;
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this.set = this.set.original;
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return this;
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}
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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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}
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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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api.ValueFactory = function( constructor ) {
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constructor = constructor || api.Value;
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return function( key ) {
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var args = slice.call( arguments, 1 );
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this[ key ] = new constructor( api.Class.applicator, args );
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this[ key ]._parent = this;
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return this[ key ];
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};
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};
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api.Values = api.Value.extend({
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defaultConstructor: api.Value,
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initialize: function( options ) {
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api.Value.prototype.initialize.call( this, {}, options || {} );
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},
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instance: function( id ) {
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return this.value( id );
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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;
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this._value[ id ] = value;
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this._value[ id ]._parent = this._value;
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return this._value[ id ];
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},
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set: function( id ) {
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if ( this.has( id ) )
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return this.pass( 'set', arguments );
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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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remove: function( id ) {
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delete this._value[ id ];
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},
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pass: function( fn, args ) {
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var id, value;
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args = slice.call( args );
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id = args.shift();
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if ( ! this.has( id ) )
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return;
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value = this.value( id );
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return value[ fn ].apply( value, args );
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}
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});
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$.each( [ 'get', 'bind', 'unbind', 'link', 'unlink' ], function( i, method ) {
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api.Values.prototype[ method ] = function() {
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return this.pass( method, arguments );
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};
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});
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/* =====================================================================
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* Messenger for postMessage.
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* ===================================================================== */
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api.Messenger = api.Class.extend({
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add: api.ValueFactory(),
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initialize: function( url, targetWindow, options ) {
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$.extend( this, options || {} );
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this.add( 'url', url );
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this.add( 'targetWindow', targetWindow || null );
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this.add( 'origin' ).link( 'url', function( url ) {
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return url().replace( /([^:]+:\/\/[^\/]+).*/, '$1' );
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});
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this.topics = {};
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$.receiveMessage( $.proxy( this.receive, this ), this.origin() || null );
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},
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receive: function( event ) {
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var message;
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// @todo: remove, this is done in the postMessage plugin.
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// if ( this.origin && event.origin !== this.origin )
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// return;
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message = JSON.parse( event.data );
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if ( message && message.id && message.data && this.topics[ message.id ] )
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this.topics[ message.id ].fireWith( this, [ message.data ]);
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},
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send: function( id, data ) {
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var message;
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if ( ! this.url() )
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return;
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message = JSON.stringify({ id: id, data: data });
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$.postMessage( message, this.url(), this.targetWindow() );
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},
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bind: function( id, callback ) {
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var topic = this.topics[ id ] || ( this.topics[ id ] = $.Callbacks() );
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topic.add( callback );
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},
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unbind: function( id, callback ) {
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if ( this.topics[ id ] )
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this.topics[ id ].remove( callback );
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}
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});
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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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// Expose the API to the world.
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exports.customize = api;
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})( wp, jQuery );
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