(function(Y) {
+
+/**
+ * Adds position and region management functionality to DOM.
+ * @module dom
+ * @submodule dom-screen
+ * @for DOM
+ */
+
+var DOCUMENT_ELEMENT = 'documentElement',
+ COMPAT_MODE = 'compatMode',
+ POSITION = 'position',
+ FIXED = 'fixed',
+ RELATIVE = 'relative',
+ LEFT = 'left',
+ TOP = 'top',
+ _BACK_COMPAT = 'BackCompat',
+ MEDIUM = 'medium',
+ BORDER_LEFT_WIDTH = 'borderLeftWidth',
+ BORDER_TOP_WIDTH = 'borderTopWidth',
+ GET_BOUNDING_CLIENT_RECT = 'getBoundingClientRect',
+ GET_COMPUTED_STYLE = 'getComputedStyle',
+
+ // TODO: how about thead/tbody/tfoot/tr?
+ // TODO: does caption matter?
+ RE_TABLE = /^t(?:able|d|h)$/i;
+
+Y.mix(Y.DOM, {
+ /**
+ * Returns the inner height of the viewport (exludes scrollbar).
+ * @method winHeight
+ * @return {Number} The current height of the viewport.
+ */
+ winHeight: function(node) {
+ var h = Y.DOM._getWinSize(node).height;
+ Y.log('winHeight returning ' + h, 'info', 'dom-screen');
+ return h;
+ },
+
+ /**
+ * Returns the inner width of the viewport (exludes scrollbar).
+ * @method winWidth
+ * @return {Number} The current width of the viewport.
+ */
+ winWidth: function(node) {
+ var w = Y.DOM._getWinSize(node).width;
+ Y.log('winWidth returning ' + w, 'info', 'dom-screen');
+ return w;
+ },
+
+ /**
+ * Document height
+ * @method docHeight
+ * @return {Number} The current height of the document.
+ */
+ docHeight: function(node) {
+ var h = Y.DOM._getDocSize(node).height;
+ Y.log('docHeight returning ' + h, 'info', 'dom-screen');
+ return Math.max(h, Y.DOM._getWinSize(node).height);
+ },
+
+ /**
+ * Document width
+ * @method docWidth
+ * @return {Number} The current width of the document.
+ */
+ docWidth: function(node) {
+ var w = Y.DOM._getDocSize(node).width;
+ Y.log('docWidth returning ' + w, 'info', 'dom-screen');
+ return Math.max(w, Y.DOM._getWinSize(node).width);
+ },
+
+ /**
+ * Amount page has been scroll horizontally
+ * @method docScrollX
+ * @return {Number} The current amount the screen is scrolled horizontally.
+ */
+ docScrollX: function(node) {
+ var doc = Y.DOM._getDoc(node);
+ return Math.max(doc[DOCUMENT_ELEMENT].scrollLeft, doc.body.scrollLeft);
+ },
+
+ /**
+ * Amount page has been scroll vertically
+ * @method docScrollY
+ * @return {Number} The current amount the screen is scrolled vertically.
+ */
+ docScrollY: function(node) {
+ var doc = Y.DOM._getDoc(node);
+ return Math.max(doc[DOCUMENT_ELEMENT].scrollTop, doc.body.scrollTop);
+ },
+
+ /**
+ * Gets the current position of an element based on page coordinates.
+ * Element must be part of the DOM tree to have page coordinates
+ * (display:none or elements not appended return false).
+ * @method getXY
+ * @param element The target element
+ * @return {Array} The XY position of the element
+
+ TODO: test inDocument/display?
+ */
+ getXY: function() {
+ if (document[DOCUMENT_ELEMENT][GET_BOUNDING_CLIENT_RECT]) {
+ return function(node) {
+ var xy = null,
+ scrollLeft,
+ scrollTop,
+ box,
+ off1, off2,
+ bLeft, bTop,
+ mode,
+ doc;
+
+ if (node) {
+ if (Y.DOM.inDoc(node)) {
+ scrollLeft = Y.DOM.docScrollX(node);
+ scrollTop = Y.DOM.docScrollY(node);
+ box = node[GET_BOUNDING_CLIENT_RECT]();
+ doc = Y.DOM._getDoc(node);
+ xy = [box.left, box.top];
+
+ if (Y.UA.ie) {
+ off1 = 2;
+ off2 = 2;
+ mode = doc[COMPAT_MODE];
+ bLeft = Y.DOM[GET_COMPUTED_STYLE](doc[DOCUMENT_ELEMENT], BORDER_LEFT_WIDTH);
+ bTop = Y.DOM[GET_COMPUTED_STYLE](doc[DOCUMENT_ELEMENT], BORDER_TOP_WIDTH);
+
+ if (Y.UA.ie === 6) {
+ if (mode !== _BACK_COMPAT) {
+ off1 = 0;
+ off2 = 0;
+ }
+ }
+
+ if ((mode == _BACK_COMPAT)) {
+ if (bLeft !== MEDIUM) {
+ off1 = parseInt(bLeft, 10);
+ }
+ if (bTop !== MEDIUM) {
+ off2 = parseInt(bTop, 10);
+ }
+ }
+
+ xy[0] -= off1;
+ xy[1] -= off2;
+
+ }
+
+ if ((scrollTop || scrollLeft)) {
+ xy[0] += scrollLeft;
+ xy[1] += scrollTop;
+ }
+ } else { // default to current offsets
+ xy = Y.DOM._getOffset(node);
+ }
+ }
+ return xy;
+ };
+ } else {
+ return function(node) { // manually calculate by crawling up offsetParents
+ //Calculate the Top and Left border sizes (assumes pixels)
+ var xy = null,
+ parentNode,
+ bCheck,
+ scrollTop,
+ scrollLeft;
+
+ if (node) {
+ if (Y.DOM.inDoc(node)) {
+ xy = [node.offsetLeft, node.offsetTop];
+ parentNode = node;
+ // TODO: refactor with !! or just falsey
+ bCheck = ((Y.UA.gecko || Y.UA.webkit > 519) ? true : false);
+
+ // TODO: worth refactoring for TOP/LEFT only?
+ while ((parentNode = parentNode.offsetParent)) {
+ xy[0] += parentNode.offsetLeft;
+ xy[1] += parentNode.offsetTop;
+ if (bCheck) {
+ xy = Y.DOM._calcBorders(parentNode, xy);
+ }
+ }
+
+ // account for any scrolled ancestors
+ if (Y.DOM.getStyle(node, POSITION) != FIXED) {
+ parentNode = node;
+
+ while ((parentNode = parentNode.parentNode)) {
+ scrollTop = parentNode.scrollTop;
+ scrollLeft = parentNode.scrollLeft;
+
+ //Firefox does something funky with borders when overflow is not visible.
+ if (Y.UA.gecko && (Y.DOM.getStyle(parentNode, 'overflow') !== 'visible')) {
+ xy = Y.DOM._calcBorders(parentNode, xy);
+ }
+
+
+ if (scrollTop || scrollLeft) {
+ xy[0] -= scrollLeft;
+ xy[1] -= scrollTop;
+ }
+ }
+ xy[0] += Y.DOM.docScrollX(node);
+ xy[1] += Y.DOM.docScrollY(node);
+
+ } else {
+ //Fix FIXED position -- add scrollbars
+ xy[0] += Y.DOM.docScrollX(node);
+ xy[1] += Y.DOM.docScrollY(node);
+ }
+ } else {
+ xy = Y.DOM._getOffset(node);
+ }
+ }
+
+ return xy;
+ };
+ }
+ }(),// NOTE: Executing for loadtime branching
+
+ _getOffset: function(node) {
+ var pos,
+ xy = null;
+
+ if (node) {
+ pos = Y.DOM.getStyle(node, POSITION);
+ xy = [
+ parseInt(Y.DOM[GET_COMPUTED_STYLE](node, LEFT), 10),
+ parseInt(Y.DOM[GET_COMPUTED_STYLE](node, TOP), 10)
+ ];
+
+ if ( isNaN(xy[0]) ) { // in case of 'auto'
+ xy[0] = parseInt(Y.DOM.getStyle(node, LEFT), 10); // try inline
+ if ( isNaN(xy[0]) ) { // default to offset value
+ xy[0] = (pos === RELATIVE) ? 0 : node.offsetLeft || 0;
+ }
+ }
+
+ if ( isNaN(xy[1]) ) { // in case of 'auto'
+ xy[1] = parseInt(Y.DOM.getStyle(node, TOP), 10); // try inline
+ if ( isNaN(xy[1]) ) { // default to offset value
+ xy[1] = (pos === RELATIVE) ? 0 : node.offsetTop || 0;
+ }
+ }
+ }
+
+ return xy;
+
+ },
+
+ /**
+ * Gets the current X position of an element based on page coordinates.
+ * Element must be part of the DOM tree to have page coordinates
+ * (display:none or elements not appended return false).
+ * @method getX
+ * @param element The target element
+ * @return {Int} The X position of the element
+ */
+
+ getX: function(node) {
+ return Y.DOM.getXY(node)[0];
+ },
+
+ /**
+ * Gets the current Y position of an element based on page coordinates.
+ * Element must be part of the DOM tree to have page coordinates
+ * (display:none or elements not appended return false).
+ * @method getY
+ * @param element The target element
+ * @return {Int} The Y position of the element
+ */
+
+ getY: function(node) {
+ return Y.DOM.getXY(node)[1];
+ },
+
+ /**
+ * Set the position of an html element in page coordinates.
+ * The element must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
+ * @method setXY
+ * @param element The target element
+ * @param {Array} xy Contains X & Y values for new position (coordinates are page-based)
+ * @param {Boolean} noRetry By default we try and set the position a second time if the first fails
+ */
+ setXY: function(node, xy, noRetry) {
+ var setStyle = Y.DOM.setStyle,
+ pos,
+ delta,
+ newXY,
+ currentXY;
+
+ if (node && xy) {
+ pos = Y.DOM.getStyle(node, POSITION);
+
+ delta = Y.DOM._getOffset(node);
+
+ if (pos == 'static') { // default to relative
+ pos = RELATIVE;
+ setStyle(node, POSITION, pos);
+ }
+
+ currentXY = Y.DOM.getXY(node);
+
+ if (xy[0] !== null) {
+ setStyle(node, LEFT, xy[0] - currentXY[0] + delta[0] + 'px');
+ }
+
+ if (xy[1] !== null) {
+ setStyle(node, TOP, xy[1] - currentXY[1] + delta[1] + 'px');
+ }
+
+ if (!noRetry) {
+ newXY = Y.DOM.getXY(node);
+ if (newXY[0] !== xy[0] || newXY[1] !== xy[1]) {
+ Y.DOM.setXY(node, xy, true);
+ }
+ }
+
+ Y.log('setXY setting position to ' + xy, 'info', 'dom-screen');
+ } else {
+ Y.log('setXY failed to set ' + node + ' to ' + xy, 'info', 'dom-screen');
+ }
+ },
+
+ /**
+ * Set the X position of an html element in page coordinates, regardless of how the element is positioned.
+ * The element(s) must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
+ * @method setX
+ * @param element The target element
+ * @param {Int} x The X values for new position (coordinates are page-based)
+ */
+ setX: function(node, x) {
+ return Y.DOM.setXY(node, [x, null]);
+ },
+
+ /**
+ * Set the Y position of an html element in page coordinates, regardless of how the element is positioned.
+ * The element(s) must be part of the DOM tree to have page coordinates (display:none or elements not appended return false).
+ * @method setY
+ * @param element The target element
+ * @param {Int} y The Y values for new position (coordinates are page-based)
+ */
+ setY: function(node, y) {
+ return Y.DOM.setXY(node, [null, y]);
+ },
+
+ _calcBorders: function(node, xy2) {
+ var t = parseInt(Y.DOM[GET_COMPUTED_STYLE](node, BORDER_TOP_WIDTH), 10) || 0,
+ l = parseInt(Y.DOM[GET_COMPUTED_STYLE](node, BORDER_LEFT_WIDTH), 10) || 0;
+ if (Y.UA.gecko) {
+ if (RE_TABLE.test(node.tagName)) {
+ t = 0;
+ l = 0;
+ }
+ }
+ xy2[0] += l;
+ xy2[1] += t;
+ return xy2;
+ },
+
+ _getWinSize: function(node) {
+ var doc = Y.DOM._getDoc(),
+ win = doc.defaultView || doc.parentWindow,
+ mode = doc[COMPAT_MODE],
+ h = win.innerHeight,
+ w = win.innerWidth,
+ root = doc[DOCUMENT_ELEMENT];
+
+ if ( mode && !Y.UA.opera ) { // IE, Gecko
+ if (mode != 'CSS1Compat') { // Quirks
+ root = doc.body;
+ }
+ h = root.clientHeight;
+ w = root.clientWidth;
+ }
+ return { height: h, width: w };
+ },
+
+ _getDocSize: function(node) {
+ var doc = Y.DOM._getDoc(),
+ root = doc[DOCUMENT_ELEMENT];
+
+ if (doc[COMPAT_MODE] != 'CSS1Compat') {
+ root = doc.body;
+ }
+
+ return { height: root.scrollHeight, width: root.scrollWidth };
+ }
+});
+})(Y);
+