source: Dev/branches/jQueryUI/js/jquery/ui/jquery.ui.widget.js @ 244

/*!
 * jQuery UI Widget 1.8.17
 *
 * Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Widget
 */
(function( $, undefined ) {

// jQuery 1.4+
if ( $.cleanData ) {
        var _cleanData = $.cleanData;
        $.cleanData = function( elems ) {
                for ( var i = 0, elem; (elem = elems[i]) != null; i++ ) {
                        try {
                                $( elem ).triggerHandler( "remove" );
                        // http://bugs.jquery.com/ticket/8235
                        } catch( e ) {}
                }
                _cleanData( elems );
        };
} else {
        var _remove = $.fn.remove;
        $.fn.remove = function( selector, keepData ) {
                return this.each(function() {
                        if ( !keepData ) {
                                if ( !selector || $.filter( selector, [ this ] ).length ) {
                                        $( "*", this ).add( [ this ] ).each(function() {
                                                try {
                                                        $( this ).triggerHandler( "remove" );
                                                // http://bugs.jquery.com/ticket/8235
                                                } catch( e ) {}
                                        });
                                }
                        }
                        return _remove.call( $(this), selector, keepData );
                });
        };
}

$.widget = function( name, base, prototype ) {
        var namespace = name.split( "." )[ 0 ],
                fullName;
        name = name.split( "." )[ 1 ];
        fullName = namespace + "-" + name;

        if ( !prototype ) {
                prototype = base;
                base = $.Widget;
        }

        // create selector for plugin
        $.expr[ ":" ][ fullName ] = function( elem ) {
                return !!$.data( elem, name );
        };

        $[ namespace ] = $[ namespace ] || {};
        $[ namespace ][ name ] = function( options, element ) {
                // allow instantiation without initializing for simple inheritance
                if ( arguments.length ) {
                        this._createWidget( options, element );
                }
        };

        var basePrototype = new base();
        // we need to make the options hash a property directly on the new instance
        // otherwise we'll modify the options hash on the prototype that we're
        // inheriting from
//      $.each( basePrototype, function( key, val ) {
//              if ( $.isPlainObject(val) ) {
//                      basePrototype[ key ] = $.extend( {}, val );
//              }
//      });
        basePrototype.options = $.extend( true, {}, basePrototype.options );
        $[ namespace ][ name ].prototype = $.extend( true, basePrototype, {
                namespace: namespace,
                widgetName: name,
                widgetEventPrefix: $[ namespace ][ name ].prototype.widgetEventPrefix || name,
                widgetBaseClass: fullName
        }, prototype );

        $.widget.bridge( name, $[ namespace ][ name ] );
};

$.widget.bridge = function( name, object ) {
        $.fn[ name ] = function( options ) {
                var isMethodCall = typeof options === "string",
                        args = Array.prototype.slice.call( arguments, 1 ),
                        returnValue = this;

                // allow multiple hashes to be passed on init
                options = !isMethodCall && args.length ?
                        $.extend.apply( null, [ true, options ].concat(args) ) :
                        options;

                // prevent calls to internal methods
                if ( isMethodCall && options.charAt( 0 ) === "_" ) {
                        return returnValue;
                }

                if ( isMethodCall ) {
                        this.each(function() {
                                var instance = $.data( this, name ),
                                        methodValue = instance && $.isFunction( instance[options] ) ?
                                                instance[ options ].apply( instance, args ) :
                                                instance;
                                // TODO: add this back in 1.9 and use $.error() (see #5972)
//                              if ( !instance ) {
//                                      throw "cannot call methods on " + name + " prior to initialization; " +
//                                              "attempted to call method '" + options + "'";
//                              }
//                              if ( !$.isFunction( instance[options] ) ) {
//                                      throw "no such method '" + options + "' for " + name + " widget instance";
//                              }
//                              var methodValue = instance[ options ].apply( instance, args );
                                if ( methodValue !== instance && methodValue !== undefined ) {
                                        returnValue = methodValue;
                                        return false;
                                }
                        });
                } else {
                        this.each(function() {
                                var instance = $.data( this, name );
                                if ( instance ) {
                                        instance.option( options || {} )._init();
                                } else {
                                        $.data( this, name, new object( options, this ) );
                                }
                        });
                }

                return returnValue;
        };
};

$.Widget = function( options, element ) {
        // allow instantiation without initializing for simple inheritance
        if ( arguments.length ) {
                this._createWidget( options, element );
        }
};

$.Widget.prototype = {
        widgetName: "widget",
        widgetEventPrefix: "",
        options: {
                disabled: false
        },
        _createWidget: function( options, element ) {
                // $.widget.bridge stores the plugin instance, but we do it anyway
                // so that it's stored even before the _create function runs
                $.data( element, this.widgetName, this );
                this.element = $( element );
                this.options = $.extend( true, {},
                        this.options,
                        this._getCreateOptions(),
                        options );

                var self = this;
                this.element.bind( "remove." + this.widgetName, function() {
                        self.destroy();
                });

                this._create();
                this._trigger( "create" );
                this._init();
        },
        _getCreateOptions: function() {
                return $.metadata && $.metadata.get( this.element[0] )[ this.widgetName ];
        },
        _create: function() {},
        _init: function() {},

        destroy: function() {
                this.element
                        .unbind( "." + this.widgetName )
                        .removeData( this.widgetName );
                this.widget()
                        .unbind( "." + this.widgetName )
                        .removeAttr( "aria-disabled" )
                        .removeClass(
                                this.widgetBaseClass + "-disabled " +
                                "ui-state-disabled" );
        },

        widget: function() {
                return this.element;
        },

        option: function( key, value ) {
                var options = key;

                if ( arguments.length === 0 ) {
                        // don't return a reference to the internal hash
                        return $.extend( {}, this.options );
                }

                if  (typeof key === "string" ) {
                        if ( value === undefined ) {
                                return this.options[ key ];
                        }
                        options = {};
                        options[ key ] = value;
                }

                this._setOptions( options );

                return this;
        },
        _setOptions: function( options ) {
                var self = this;
                $.each( options, function( key, value ) {
                        self._setOption( key, value );
                });

                return this;
        },
        _setOption: function( key, value ) {
                this.options[ key ] = value;

                if ( key === "disabled" ) {
                        this.widget()
                                [ value ? "addClass" : "removeClass"](
                                        this.widgetBaseClass + "-disabled" + " " +
                                        "ui-state-disabled" )
                                .attr( "aria-disabled", value );
                }

                return this;
        },

        enable: function() {
                return this._setOption( "disabled", false );
        },
        disable: function() {
                return this._setOption( "disabled", true );
        },

        _trigger: function( type, event, data ) {
                var prop, orig,
                        callback = this.options[ type ];

                data = data || {};
                event = $.Event( event );
                event.type = ( type === this.widgetEventPrefix ?
                        type :
                        this.widgetEventPrefix + type ).toLowerCase();
                // the original event may come from any element
                // so we need to reset the target on the new event
                event.target = this.element[ 0 ];

                // copy original event properties over to the new event
                orig = event.originalEvent;
                if ( orig ) {
                        for ( prop in orig ) {
                                if ( !( prop in event ) ) {
                                        event[ prop ] = orig[ prop ];
                                }
                        }
                }

                this.element.trigger( event, data );

                return !( $.isFunction(callback) &&
                        callback.call( this.element[0], event, data ) === false ||
                        event.isDefaultPrevented() );
        }
};

})( jQuery );