jquery-ui/ui/jquery.ui.widget.js

/*!
 * jQuery UI Widget @VERSION
 *
 * 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 ) {

var slice = Array.prototype.slice;

var _cleanData = $.cleanData;
$.cleanData = function( elems ) {
	for ( var i = 0, elem; (elem = elems[i]) != null; i++ ) {
		$( elem ).triggerHandler( "remove" );
	}
	_cleanData( elems );
};

$.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 ] || {};
	// create the constructor using $.extend() so we can carry over any
	// static properties stored on the existing constructor (if there is one)
	$[ namespace ][ name ] = $.extend( function( options, element ) {
		// allow instantiation without "new" keyword
		if ( !this._createWidget ) {
			return new $[ namespace ][ name ]( options, element );
		}

		// allow instantiation without initializing for simple inheritance
		// must use "new" keyword (the code above always passes args)
		if ( arguments.length ) {
			this._createWidget( options, element );
		}
	}, $[ namespace ][ name ] );

	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
	basePrototype.options = $.widget.extend( {}, basePrototype.options );
	$.each( prototype, function( prop, value ) {
		if ( $.isFunction( value ) ) {
			prototype[ prop ] = (function() {
				var _super = function( method ) {
					return base.prototype[ method ].apply( this, slice.call( arguments, 1 ) );
				};
				var _superApply = function( method, args ) {
					return base.prototype[ method ].apply( this, args );
				};
				return function() {
					var __super = this._super,
						__superApply = this._superApply,
						returnValue;

					this._super = _super;
					this._superApply = _superApply;

					returnValue = value.apply( this, arguments );

					this._super = __super;
					this._superApply = __superApply;

					return returnValue;
				};
			}());
		}
	});
	$[ namespace ][ name ].prototype = $.widget.extend( basePrototype, {
		namespace: namespace,
		widgetName: name,
		widgetEventPrefix: name,
		widgetBaseClass: fullName
	}, prototype );

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

$.widget.extend = function( target ) {
	var input = slice.call( arguments, 1 ),
		inputIndex = 0,
		inputLength = input.length,
		key,
		value;
	for ( ; inputIndex < inputLength; inputIndex++ ) {
		for ( key in input[ inputIndex ] ) {
			value = input[ inputIndex ][ key ];
			if (input[ inputIndex ].hasOwnProperty( key ) && value !== undefined ) {
				target[ key ] = $.isPlainObject( value ) ? $.widget.extend( {}, target[ key ], value ) : value;
			}
		}
	}
	return target;
};

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

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

		if ( isMethodCall ) {
			this.each(function() {
				var instance = $.data( this, name );
				if ( !instance ) {
					return $.error( "cannot call methods on " + name + " prior to initialization; " +
						"attempted to call method '" + options + "'" );
				}
				if ( !$.isFunction( instance[options] ) || options.charAt( 0 ) === "_" ) {
					return $.error( "no such method '" + options + "' for " + name + " widget instance" );
				}
				var methodValue = instance[ options ].apply( instance, args );
				if ( methodValue !== instance && methodValue !== undefined ) {
					returnValue = methodValue.jquery ?
						returnValue.pushStack( methodValue.get() ) :
						methodValue;
					return false;
				}
			});
		} else {
			this.each(function() {
				var instance = $.data( this, name );
				if ( instance ) {
					instance.option( options || {} )._init();
				} else {
					object( options, this );
				}
			});
		}

		return returnValue;
	};
};

$.Widget = function( options, element ) {
	// allow instantiation without "new" keyword
	if ( !this._createWidget ) {
		return new $[ namespace ][ name ]( options, element );
	}

	// allow instantiation without initializing for simple inheritance
	// must use "new" keyword (the code above always passes args)
	if ( arguments.length ) {
		this._createWidget( options, element );
	}
};

$.Widget.prototype = {
	widgetName: "widget",
	widgetEventPrefix: "",
	defaultElement: "<div>",
	options: {
		disabled: false,

		// callbacks
		create: null
	},
	_createWidget: function( options, element ) {
		element = $( element || this.defaultElement || this )[ 0 ];
		this.element = $( element );
		this.options = $.widget.extend( {},
			this.options,
			this._getCreateOptions(),
			options );

		this.bindings = $();
		this.hoverable = $();
		this.focusable = $();

		if ( element !== this ) {
			$.data( element, this.widgetName, this );
			this._bind({ remove: "destroy" });
		}

		this._create();
		this._trigger( "create" );
		this._init();
	},
	_getCreateOptions: $.noop,
	_create: $.noop,
	_init: $.noop,

	destroy: function() {
		this._destroy();
		// we can probably remove the unbind calls in 2.0
		// all event bindings should go through this._bind()
		this.element
			.unbind( "." + this.widgetName )
			.removeData( this.widgetName );
		this.widget()
			.unbind( "." + this.widgetName )
			.removeAttr( "aria-disabled" )
			.removeClass(
				this.widgetBaseClass + "-disabled " +
				"ui-state-disabled" );

		// clean up events and states
		this.bindings.unbind( "." + this.widgetName );
		this.hoverable.removeClass( "ui-state-hover" );
		this.focusable.removeClass( "ui-state-focus" );
	},
	_destroy: $.noop,

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

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

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

		if ( typeof key === "string" ) {
			if ( value === undefined ) {
				return this.options[ key ];
			}
			// handle nested keys, e.g., "foo.bar" => { foo: { bar: ___ } }
			options = {};
			parts = key.split( "." );
			key = parts.shift();
			if ( parts.length ) {
				curOption = options[ key ] = $.widget.extend( {}, this.options[ key ] );
				for ( i = 0; i < parts.length - 1; i++ ) {
					curOption[ parts[ i ] ] = curOption[ parts[ i ] ] || {};
					curOption = curOption[ parts[ i ] ];
				}
				curOption[ parts.pop() ] = value;
			} else {
				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()
				.toggleClass( this.widgetBaseClass + "-disabled ui-state-disabled", !!value )
				.attr( "aria-disabled", value );
			this.hoverable.removeClass( "ui-state-hover" );
			this.focusable.removeClass( "ui-state-focus" );
		}

		return this;
	},

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

	_bind: function( element, handlers ) {
		// no element argument, shuffle and use this.element
		if ( !handlers ) {
			handlers = element;
			element = this.element;
		} else {
			// accept selectors, DOM elements
			element = $( element );
			this.bindings = this.bindings.add( element );
		}
		var instance = this;
		$.each( handlers, function( event, handler ) {
			element.bind( event + "." + instance.widgetName, function() {
				// allow widgets to customize the disabled handling
				// - disabled as an array instead of boolean
				// - disabled class as method for disabling individual parts
				if ( instance.options.disabled === true ||
						$( this ).hasClass( "ui-state-disabled" ) ) {
					return;
				}
				return ( typeof handler === "string" ? instance[ handler ] : handler )
					.apply( instance, arguments );
			});
		});
	},

	_hoverable: function( element ) {
		this.hoverable = this.hoverable.add( element );
		this._bind( element, {
			mouseenter: function( event ) {
				$( event.currentTarget ).addClass( "ui-state-hover" );
			},
			mouseleave: function( event ) {
				$( event.currentTarget ).removeClass( "ui-state-hover" );
			}
		});
	},

	_focusable: function( element ) {
		this.focusable = this.focusable.add( element );
		this._bind( element, {
			focusin: function( event ) {
				$( event.currentTarget ).addClass( "ui-state-focus" );
			},
			focusout: function( event ) {
				$( event.currentTarget ).removeClass( "ui-state-focus" );
			}
		});
	},

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

		event = $.Event( event );
		event.type = ( type === this.widgetEventPrefix ?
			type :
			this.widgetEventPrefix + type ).toLowerCase();
		data = data || {};

		// copy original event properties over to the new event
		// this would happen if we could call $.event.fix instead of $.Event
		// but we don't have a way to force an event to be fixed multiple times
		if ( event.originalEvent ) {
			for ( var i = $.event.props.length, prop; i; ) {
				prop = $.event.props[ --i ];
				event[ prop ] = event.originalEvent[ prop ];
			}
		}

		this.element.trigger( event, data );

		args = $.isArray( data ) ?
			[ event ].concat( data ) :
			[ event, data ];

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

$.each( { show: "fadeIn", hide: "fadeOut" }, function( method, defaultEffect ) {
	$.Widget.prototype[ "_" + method ] = function( element, options, callback ) {
		options = options || {};
		var hasOptions = !$.isEmptyObject( options ),
			effectName = options.effect || defaultEffect;
		options.complete = callback;
		if (options.delay) {
			element.delay( options.delay );
		}
		if ( hasOptions && $.effects && ( $.effects.effect[ effectName ] || $.uiBackCompat !== false && $.effects[ effectName ] ) ) {
			element[ method ]( options );
		} else if ( effectName !== method && element[ effectName ] ) {
			element[ effectName ]( options.duration, options.easing, callback );
		} else {
			element.queue( function() {
				$( this )[ method ]();
				if ( callback ) {
					callback.call( element[ 0 ] );
				}
			});
		}
	};
});

// DEPRECATED
if ( $.uiBackCompat !== false ) {
	$.Widget.prototype._getCreateOptions = function() {
		return $.metadata && $.metadata.get( this.element[0] )[ this.widgetName ];
	};
}

})( jQuery );