trotzig/diffux

define([
    "./core",
    "./var/strundefined",
    "./core/access",
    "./css/var/rnumnonpx",
    "./css/curCSS",
    "./css/addGetHookIf",
    "./css/support",

    "./core/init",
    "./css",
    "./selector" // contains
], function( jQuery, strundefined, access, rnumnonpx, curCSS, addGetHookIf, support ) {

var docElem = window.document.documentElement;

/**
 * Gets a window from an element
 */
function getWindow( elem ) {
    return jQuery.isWindow( elem ) ? elem : elem.nodeType === 9 && elem.defaultView;
}

jQuery.offset = {
    setOffset: function( elem, options, i ) {
        var curPosition, curLeft, curCSSTop, curTop, curOffset, curCSSLeft, calculatePosition,
            position = jQuery.css( elem, "position" ),
            curElem = jQuery( elem ),
            props = {};

        // Set position first, in-case top/left are set even on static elem
        if ( position === "static" ) {
            elem.style.position = "relative";
        }

        curOffset = curElem.offset();
        curCSSTop = jQuery.css( elem, "top" );
        curCSSLeft = jQuery.css( elem, "left" );
        calculatePosition = ( position === "absolute" || position === "fixed" ) &&
            ( curCSSTop + curCSSLeft ).indexOf("auto") > -1;

        // Need to be able to calculate position if either
        // top or left is auto and position is either absolute or fixed
        if ( calculatePosition ) {
            curPosition = curElem.position();
            curTop = curPosition.top;
            curLeft = curPosition.left;

        } else {
            curTop = parseFloat( curCSSTop ) || 0;
            curLeft = parseFloat( curCSSLeft ) || 0;
        }

        if ( jQuery.isFunction( options ) ) {
            options = options.call( elem, i, curOffset );
        }

        if ( options.top != null ) {
            props.top = ( options.top - curOffset.top ) + curTop;
        }
        if ( options.left != null ) {
            props.left = ( options.left - curOffset.left ) + curLeft;
        }

        if ( "using" in options ) {
            options.using.call( elem, props );

        } else {
            curElem.css( props );
        }
    }
};

jQuery.fn.extend({
    offset: function( options ) {
        if ( arguments.length ) {
            return options === undefined ?
                this :
                this.each(function( i ) {
                    jQuery.offset.setOffset( this, options, i );
                });
        }

        var docElem, win,
            elem = this[ 0 ],
            box = { top: 0, left: 0 },
            doc = elem && elem.ownerDocument;

        if ( !doc ) {
            return;
        }

        docElem = doc.documentElement;

        // Make sure it's not a disconnected DOM node
        if ( !jQuery.contains( docElem, elem ) ) {
            return box;
        }

        // Support: BlackBerry 5, iOS 3 (original iPhone)
        // If we don't have gBCR, just use 0,0 rather than error
        if ( typeof elem.getBoundingClientRect !== strundefined ) {
            box = elem.getBoundingClientRect();
        }
        win = getWindow( doc );
        return {
            top: box.top + win.pageYOffset - docElem.clientTop,
            left: box.left + win.pageXOffset - docElem.clientLeft
        };
    },

    position: function() {
        if ( !this[ 0 ] ) {
            return;
        }

        var offsetParent, offset,
            elem = this[ 0 ],
            parentOffset = { top: 0, left: 0 };

        // Fixed elements are offset from window (parentOffset = {top:0, left: 0}, because it is its only offset parent
        if ( jQuery.css( elem, "position" ) === "fixed" ) {
            // Assume getBoundingClientRect is there when computed position is fixed
            offset = elem.getBoundingClientRect();

        } else {
            // Get *real* offsetParent
            offsetParent = this.offsetParent();

            // Get correct offsets
            offset = this.offset();
            if ( !jQuery.nodeName( offsetParent[ 0 ], "html" ) ) {
                parentOffset = offsetParent.offset();
            }

            // Add offsetParent borders
            parentOffset.top += jQuery.css( offsetParent[ 0 ], "borderTopWidth", true );
            parentOffset.left += jQuery.css( offsetParent[ 0 ], "borderLeftWidth", true );
        }

        // Subtract parent offsets and element margins
        return {
            top: offset.top - parentOffset.top - jQuery.css( elem, "marginTop", true ),
            left: offset.left - parentOffset.left - jQuery.css( elem, "marginLeft", true )
        };
    },

    offsetParent: function() {
        return this.map(function() {
            var offsetParent = this.offsetParent || docElem;

            while ( offsetParent && ( !jQuery.nodeName( offsetParent, "html" ) && jQuery.css( offsetParent, "position" ) === "static" ) ) {
                offsetParent = offsetParent.offsetParent;
            }

            return offsetParent || docElem;
        });
    }
});

// Create scrollLeft and scrollTop methods
jQuery.each( { scrollLeft: "pageXOffset", scrollTop: "pageYOffset" }, function( method, prop ) {
    var top = "pageYOffset" === prop;

    jQuery.fn[ method ] = function( val ) {
        return access( this, function( elem, method, val ) {
            var win = getWindow( elem );

            if ( val === undefined ) {
                return win ? win[ prop ] : elem[ method ];
            }

            if ( win ) {
                win.scrollTo(
                    !top ? val : window.pageXOffset,
                    top ? val : window.pageYOffset
                );

            } else {
                elem[ method ] = val;
            }
        }, method, val, arguments.length, null );
    };
});

// Support: Safari<7+, Chrome<37+
// Add the top/left cssHooks using jQuery.fn.position
// Webkit bug: https://bugs.webkit.org/show_bug.cgi?id=29084
// Blink bug: https://code.google.com/p/chromium/issues/detail?id=229280
// getComputedStyle returns percent when specified for top/left/bottom/right;
// rather than make the css module depend on the offset module, just check for it here
jQuery.each( [ "top", "left" ], function( i, prop ) {
    jQuery.cssHooks[ prop ] = addGetHookIf( support.pixelPosition,
        function( elem, computed ) {
            if ( computed ) {
                computed = curCSS( elem, prop );
                // If curCSS returns percentage, fallback to offset
                return rnumnonpx.test( computed ) ?
                    jQuery( elem ).position()[ prop ] + "px" :
                    computed;
            }
        }
    );
});

return jQuery;
});