# Yahoo! UI Library

### node 3.0.0b1

Yahoo! UI Library > node > node-screen.js (source view)
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    /**
     * Extended Node interface for managing regions and screen positioning.
     * Adds support for positioning elements and normalizes window size and scroll detection.
     * @module node
     * @submodule node-screen
     */

    // these are all "safe" returns, no wrapping required
    Y.each([
        /**
         * Returns the inner width of the viewport (exludes scrollbar).
         * @config winWidth
         * @for Node
         * @type {Int}
         */
        'winWidth',

        /**
         * Returns the inner height of the viewport (exludes scrollbar).
         * @config winHeight
         * @type {Int}
         */
        'winHeight',

        /**
         * Document width
         * @config winHeight
         * @type {Int}
         */
        'docWidth',

        /**
         * Document height
         * @config docHeight
         * @type {Int}
         */
        'docHeight',

        /**
         * Amount page has been scroll vertically
         * @config docScrollX
         * @type {Int}
         */
        'docScrollX',

        /**
         * Amount page has been scroll horizontally
         * @config docScrollY
         * @type {Int}
         */
        'docScrollY'
        ],
        function(name) {
            Y.Node.ATTRS[name] = {
                getter: function() {
                    var args = Array.prototype.slice.call(arguments);
                    args.unshift(Y.Node.getDOMNode(this));

                    return Y.DOM[name].apply(this, args);
                }
            };
        }
    );

    Y.Node.ATTRS.scrollLeft = {
        getter: function() {
            var node = Y.Node.getDOMNode(this);
            return ('scrollLeft' in node) ? node.scrollLeft : Y.DOM.docScrollX(node);
        },

        setter: function(val) {
            var node = Y.Node.getDOMNode(this);
            if (node) {
                if ('scrollLeft' in node) {
                    node.scrollLeft = val;
                } else if (node.document || node.nodeType === 9) {
                    Y.DOM._getWin(node).scrollTo(val, Y.DOM.docScrollY(node)); // scroll window if win or doc
                }
            } else {
                Y.log('unable to set scrollLeft for ' + node, 'error', 'Node');
            }
        }
    };

    Y.Node.ATTRS.scrollTop = {
        getter: function() {
            var node = Y.Node.getDOMNode(this);
            return ('scrollTop' in node) ? node.scrollTop : Y.DOM.docScrollY(node);
        },

        setter: function(val) {
            var node = Y.Node.getDOMNode(this);
            if (node) {
                if ('scrollTop' in node) {
                    node.scrollTop = val;
                } else if (node.document || node.nodeType === 9) {
                    Y.DOM._getWin(node).scrollTo(Y.DOM.docScrollX(node), val); // scroll window if win or doc
                }
            } else {
                Y.log('unable to set scrollTop for ' + node, 'error', 'Node');
            }
        }
    };

    Y.Node.importMethod(Y.DOM, [
    /**
     * Gets the current position of the node in page coordinates.
     * @method getXY
     * @for Node
     * @return {Array} The XY position of the node
    */
        'getXY',

    /**
     * Set the position of the node in page coordinates, regardless of how the node is positioned.
     * @method setXY
     * @param {Array} xy Contains X & Y values for new position (coordinates are page-based)
     * @chainable
     */
        'setXY',

    /**
     * Gets the current position of the node in page coordinates.
     * @method getX
     * @return {Int} The X position of the node
    */
        'getX',

    /**
     * Set the position of the node in page coordinates, regardless of how the node is positioned.
     * @method setX
     * @param {Int} x X value for new position (coordinates are page-based)
     * @chainable
     */
        'setX',

    /**
     * Gets the current position of the node in page coordinates.
     * @method getY
     * @return {Int} The Y position of the node
    */
        'getY',

    /**
     * Set the position of the node in page coordinates, regardless of how the node is positioned.
     * @method setY
     * @param {Int} y Y value for new position (coordinates are page-based)
     * @chainable
     */
        'setY'
    ]);

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