function resizeElement()

in _dist/alertify/alertify.js [1785:1838]
37 lines of code
9 McCabe index (conditional complexity)

        function resizeElement(event, element, pageRelative) {

            //calculate offsets from 0,0
            var current = element;
            var offsetLeft = 0;
            var offsetTop = 0;
            do {
                offsetLeft += current.offsetLeft;
                offsetTop += current.offsetTop;
            } while (current = current.offsetParent);

            // determine X,Y coordinates.
            var X, Y;
            if (pageRelative === true) {
                X = event.pageX;
                Y = event.pageY;
            } else {
                X = event.clientX;
                Y = event.clientY;
            }
            // rtl handling
            var isRTL = isRightToLeft();
            if (isRTL) {
                // reverse X 
                X = document.body.offsetWidth - X;
                // if has a starting left, calculate offsetRight
                if (!isNaN(startingLeft)) {
                    offsetLeft = document.body.offsetWidth - offsetLeft - element.offsetWidth;
                }
            }

            // set width/height
            element.style.height = (Y - offsetTop + handleOffset) + 'px';
            element.style.width = (X - offsetLeft + handleOffset) + 'px';

            // if the element being resized has a starting left, maintain it.
            // the dialog is centered, divide by half the offset to maintain the margins.
            if (!isNaN(startingLeft)) {
                var diff = Math.abs(element.offsetWidth - startingWidth) * 0.5;
                if (isRTL) {
                    //negate the diff, why?
                    //when growing it should decrease left
                    //when shrinking it should increase left
                    diff *= -1;
                }
                if (element.offsetWidth > startingWidth) {
                    //growing
                    element.style.left = (startingLeft + diff) + 'px';
                } else if (element.offsetWidth >= minWidth) {
                    //shrinking
                    element.style.left = (startingLeft - diff) + 'px';
                }
            }
        }