dojo.provide("dojox.grid._Builder");

dojo.require("dojox.grid.util");
dojo.require("dojo.dnd.Moveable");

(function(){
	var dg = dojox.grid;

	var getTdIndex = function(td){
		return td.cellIndex >=0 ? td.cellIndex : dojo.indexOf(td.parentNode.cells, td);
	};
	
	var getTrIndex = function(tr){
		return tr.rowIndex >=0 ? tr.rowIndex : dojo.indexOf(tr.parentNode.childNodes, tr);
	};
	
	var getTr = function(rowOwner, index){
		return rowOwner && ((rowOwner.rows||0)[index] || rowOwner.childNodes[index]);
	};

	var findTable = function(node){
		for(var n=node; n && n.tagName!='TABLE'; n=n.parentNode){}
		return n;
	};
	
	var ascendDom = function(inNode, inWhile){
		for(var n=inNode; n && inWhile(n); n=n.parentNode){}
		return n;
	};
	
	var makeNotTagName = function(inTagName){
		var name = inTagName.toUpperCase();
		return function(node){ return node.tagName != name; };
	};

	var rowIndexTag = dojox.grid.util.rowIndexTag;
	var gridViewTag = dojox.grid.util.gridViewTag;

	// base class for generating markup for the views
	dg._Builder = dojo.extend(function(view){
		if(view){
			this.view = view;
			this.grid = view.grid;
		}
	},{
		view: null,
		// boilerplate HTML
		_table: '<table class="dojoxGridRowTable" border="0" cellspacing="0" cellpadding="0" role="presentation"',

		// Returns the table variable as an array - and with the view width, if specified
		getTableArray: function(){
			var html = [this._table];
			if(this.view.viewWidth){
				html.push([' style="width:', this.view.viewWidth, ';"'].join(''));
			}
			html.push('>');
			return html;
		},
		
		// generate starting tags for a cell
		generateCellMarkup: function(inCell, inMoreStyles, inMoreClasses, isHeader){
			var result = [], html;
			if(isHeader){
				var sortInfo = inCell.index != inCell.grid.getSortIndex() ? "" : inCell.grid.sortInfo > 0 ? 'aria-sort="ascending"' : 'aria-sort="descending"';
				if (!inCell.id){
					inCell.id = this.grid.id + "Hdr" + inCell.index;
				}
				// column headers are not editable, mark as aria-readonly=true
				html = ['<th tabIndex="-1" aria-readonly="true" role="columnheader"', sortInfo, 'id="', inCell.id, '"'];
			}else{
				// cells inherit grid aria-readonly property; default value for aria-readonly is false(grid is editable)
				// if grid is editable (had any editable cells), mark non editable cells as aria-readonly=true
				// if no editable cells, grid's aria-readonly value will have been set to true and cells will inherit
				var editInfo = this.grid.editable && !inCell.editable ? 'aria-readonly="true"' : "";
				html = ['<td tabIndex="-1" role="gridcell"', editInfo];
			}
			if(inCell.colSpan){
				html.push(' colspan="', inCell.colSpan, '"');
			}
			if(inCell.rowSpan){
				html.push(' rowspan="', inCell.rowSpan, '"');
			}
			html.push(' class="dojoxGridCell ');
			if(inCell.classes){
				html.push(inCell.classes, ' ');
			}
			if(inMoreClasses){
				html.push(inMoreClasses, ' ');
			}
			// result[0] => td opener, style
			result.push(html.join(''));
			// SLOT: result[1] => td classes
			result.push('');
			html = ['" idx="', inCell.index, '" style="'];
			if(inMoreStyles && inMoreStyles[inMoreStyles.length-1] != ';'){
				inMoreStyles += ';';
			}
			html.push(inCell.styles, inMoreStyles||'', inCell.hidden?'display:none;':'');
			if(inCell.unitWidth){
				html.push('width:', inCell.unitWidth, ';');
			}
			// result[2] => markup
			result.push(html.join(''));
			// SLOT: result[3] => td style
			result.push('');
			html = [ '"' ];
			if(inCell.attrs){
				html.push(" ", inCell.attrs);
			}
			html.push('>');
			// result[4] => td postfix
			result.push(html.join(''));
			// SLOT: result[5] => content
			result.push('');
			// result[6] => td closes
			result.push(isHeader?'</th>':'</td>');
			return result; // Array
		},

		// cell finding
		isCellNode: function(inNode){
			return Boolean(inNode && inNode!=dojo.doc && dojo.attr(inNode, "idx"));
		},
		
		getCellNodeIndex: function(inCellNode){
			return inCellNode ? Number(dojo.attr(inCellNode, "idx")) : -1;
		},
		
		getCellNode: function(inRowNode, inCellIndex){
			for(var i=0, row; ((row = getTr(inRowNode.firstChild, i)) && row.cells); i++){
				for(var j=0, cell; (cell = row.cells[j]); j++){
					if(this.getCellNodeIndex(cell) == inCellIndex){
						return cell;
					}
				}
			}
			return null;
		},
		
		findCellTarget: function(inSourceNode, inTopNode){
			var n = inSourceNode;
			while(n && (!this.isCellNode(n) || (n.offsetParent && gridViewTag in n.offsetParent.parentNode && n.offsetParent.parentNode[gridViewTag] != this.view.id)) && (n!=inTopNode)){
				n = n.parentNode;
			}
			return n!=inTopNode ? n : null;
		},
		
		// event decoration
		baseDecorateEvent: function(e){
			e.dispatch = 'do' + e.type;
			e.grid = this.grid;
			e.sourceView = this.view;
			e.cellNode = this.findCellTarget(e.target, e.rowNode);
			e.cellIndex = this.getCellNodeIndex(e.cellNode);
			e.cell = (e.cellIndex >= 0 ? this.grid.getCell(e.cellIndex) : null);
		},
		
		// event dispatch
		findTarget: function(inSource, inTag){
			var n = inSource;
			while(n && (n!=this.domNode) && (!(inTag in n) || (gridViewTag in n && n[gridViewTag] != this.view.id))){
				n = n.parentNode;
			}
			return (n != this.domNode) ? n : null;
		},

		findRowTarget: function(inSource){
			return this.findTarget(inSource, rowIndexTag);
		},

		isIntraNodeEvent: function(e){
			try{
				return (e.cellNode && e.relatedTarget && dojo.isDescendant(e.relatedTarget, e.cellNode));
			}catch(x){
				// e.relatedTarget has permission problem in FF if it's an input: https://bugzilla.mozilla.org/show_bug.cgi?id=208427
				return false;
			}
		},

		isIntraRowEvent: function(e){
			try{
				var row = e.relatedTarget && this.findRowTarget(e.relatedTarget);
				return !row && (e.rowIndex==-1) || row && (e.rowIndex==row.gridRowIndex);
			}catch(x){
				// e.relatedTarget on INPUT has permission problem in FF: https://bugzilla.mozilla.org/show_bug.cgi?id=208427
				return false;
			}
		},

		dispatchEvent: function(e){
			if(e.dispatch in this){
				return this[e.dispatch](e);
			}
			return false;
		},

		// dispatched event handlers
		domouseover: function(e){
			if(e.cellNode && (e.cellNode!=this.lastOverCellNode)){
				this.lastOverCellNode = e.cellNode;
				this.grid.onMouseOver(e);
			}
			this.grid.onMouseOverRow(e);
		},

		domouseout: function(e){
			if(e.cellNode && (e.cellNode==this.lastOverCellNode) && !this.isIntraNodeEvent(e, this.lastOverCellNode)){
				this.lastOverCellNode = null;
				this.grid.onMouseOut(e);
				if(!this.isIntraRowEvent(e)){
					this.grid.onMouseOutRow(e);
				}
			}
		},
		
		domousedown: function(e){
			if (e.cellNode)
				this.grid.onMouseDown(e);
			this.grid.onMouseDownRow(e);
		}
	});

	// Produces html for grid data content. Owned by grid and used internally
	// for rendering data. Override to implement custom rendering.
	dg._ContentBuilder = dojo.extend(function(view){
		dg._Builder.call(this, view);
	},dg._Builder.prototype,{
		update: function(){
			this.prepareHtml();
		},

		// cache html for rendering data rows
		prepareHtml: function(){
			var defaultGet=this.grid.get, cells=this.view.structure.cells;
			for(var j=0, row; (row=cells[j]); j++){
				for(var i=0, cell; (cell=row[i]); i++){
					cell.get = cell.get || (cell.value == undefined) && defaultGet;
					cell.markup = this.generateCellMarkup(cell, cell.cellStyles, cell.cellClasses, false);
					if (!this.grid.editable && cell.editable){
						this.grid.editable = true;
					}
				}
			}
		},

		// time critical: generate html using cache and data source
		generateHtml: function(inDataIndex, inRowIndex){
			var
				html = this.getTableArray(),
				v = this.view,
				cells = v.structure.cells,
				item = this.grid.getItem(inRowIndex);

			dojox.grid.util.fire(this.view, "onBeforeRow", [inRowIndex, cells]);
			for(var j=0, row; (row=cells[j]); j++){
				if(row.hidden || row.header){
					continue;
				}
				html.push(!row.invisible ? '<tr>' : '<tr class="dojoxGridInvisible">');
				for(var i=0, cell, m, cc, cs; (cell=row[i]); i++){
					m = cell.markup; cc = cell.customClasses = []; cs = cell.customStyles = [];
					// content (format can fill in cc and cs as side-effects)
					m[5] = cell.format(inRowIndex, item);
					// classes
					m[1] = cc.join(' ');
					// styles
					m[3] = cs.join(';');
					// in-place concat
					html.push.apply(html, m);
				}
				html.push('</tr>');
			}
			html.push('</table>');
			return html.join(''); // String
		},

		decorateEvent: function(e){
			e.rowNode = this.findRowTarget(e.target);
			if(!e.rowNode){return false;}
			e.rowIndex = e.rowNode[rowIndexTag];
			this.baseDecorateEvent(e);
			e.cell = this.grid.getCell(e.cellIndex);
			return true; // Boolean
		}
	});

	// Produces html for grid header content. Owned by grid and used internally
	// for rendering data. Override to implement custom rendering.
	dg._HeaderBuilder = dojo.extend(function(view){
		this.moveable = null;
		dg._Builder.call(this, view);
	},dg._Builder.prototype,{
		_skipBogusClicks: false,
		overResizeWidth: 4,
		minColWidth: 1,
		
		update: function(){
			if(this.tableMap){
				this.tableMap.mapRows(this.view.structure.cells);
			}else{
				this.tableMap = new dg._TableMap(this.view.structure.cells);
			}
		},

		generateHtml: function(inGetValue, inValue){
			var html = this.getTableArray(), cells = this.view.structure.cells;
			
			dojox.grid.util.fire(this.view, "onBeforeRow", [-1, cells]);
			for(var j=0, row; (row=cells[j]); j++){
				if(row.hidden){
					continue;
				}
				html.push(!row.invisible ? '<tr>' : '<tr class="dojoxGridInvisible">');
				for(var i=0, cell, markup; (cell=row[i]); i++){
					cell.customClasses = [];
					cell.customStyles = [];
					if(this.view.simpleStructure){
						if(cell.draggable){
							if(cell.headerClasses){
								if(cell.headerClasses.indexOf('dojoDndItem') == -1){
									cell.headerClasses += ' dojoDndItem';
								}
							}else{
								cell.headerClasses = 'dojoDndItem';
							}
						}
						if(cell.attrs){
							if(cell.attrs.indexOf("dndType='gridColumn_") == -1){
								cell.attrs += " dndType='gridColumn_" + this.grid.id + "'";
							}
						}else{
							cell.attrs = "dndType='gridColumn_" + this.grid.id + "'";
						}
					}
					markup = this.generateCellMarkup(cell, cell.headerStyles, cell.headerClasses, true);
					// content
					markup[5] = (inValue != undefined ? inValue : inGetValue(cell));
					// styles
					markup[3] = cell.customStyles.join(';');
					// classes
					markup[1] = cell.customClasses.join(' '); //(cell.customClasses ? ' ' + cell.customClasses : '');
					html.push(markup.join(''));
				}
				html.push('</tr>');
			}
			html.push('</table>');
			return html.join('');
		},

		// event helpers
		getCellX: function(e){
			var n, x = e.layerX;
			if(dojo.isMoz || dojo.isIE >= 9){
				n = ascendDom(e.target, makeNotTagName("th"));
				x -= (n && n.offsetLeft) || 0;
				var t = e.sourceView.getScrollbarWidth();
				if(!dojo._isBodyLtr()/*&& e.sourceView.headerNode.scrollLeft < t*/){
					//fix #11253
					table = ascendDom(n,makeNotTagName("table"));
					x -= (table && table.offsetLeft) || 0;
				}
				//x -= getProp(ascendDom(e.target, mkNotTagName("td")), "offsetLeft") || 0;
			}
			n = ascendDom(e.target, function(){
				if(!n || n == e.cellNode){
					return false;
				}
				// Mozilla 1.8 (FF 1.5) has a bug that makes offsetLeft = -parent border width
				// when parent has border, overflow: hidden, and is positioned
				// handle this problem here ... not a general solution!
				x += (n.offsetLeft < 0 ? 0 : n.offsetLeft);
				return true;
			});
			return x;
		},

		// event decoration
		decorateEvent: function(e){
			this.baseDecorateEvent(e);
			e.rowIndex = -1;
			e.cellX = this.getCellX(e);
			return true;
		},

		// event handlers
		// resizing
		prepareResize: function(e, mod){
			do{
				var i = getTdIndex(e.cellNode);
				e.cellNode = (i ? e.cellNode.parentNode.cells[i+mod] : null);
				e.cellIndex = (e.cellNode ? this.getCellNodeIndex(e.cellNode) : -1);
			}while(e.cellNode && e.cellNode.style.display == "none");
			return Boolean(e.cellNode);
		},

		canResize: function(e){
			if(!e.cellNode || e.cellNode.colSpan > 1){
				return false;
			}
			var cell = this.grid.getCell(e.cellIndex);
			return !cell.noresize && cell.canResize();
		},

		overLeftResizeArea: function(e){
			// We are never over a resize area if we are in the process of moving
			if(dojo.hasClass(dojo.body(), "dojoDndMove")){
				return false;
			}
			//Bugfix for crazy IE problem (#8807).  IE returns position information for the icon and text arrow divs
			//as if they were still on the left instead of returning the position they were 'float: right' to.
			//So, the resize check ends up checking the wrong adjacent cell.  This checks to see if the hover was over
			//the image or text nodes, then just ignored them/treat them not in scale range.
			if(dojo.isIE){
				var tN = e.target;
				if(dojo.hasClass(tN, "dojoxGridArrowButtonNode") ||
					dojo.hasClass(tN, "dojoxGridArrowButtonChar")){
					return false;
				}
			}

			if(dojo._isBodyLtr()){
				return (e.cellIndex>0) && (e.cellX > 0 && e.cellX < this.overResizeWidth) && this.prepareResize(e, -1);
			}
			var t = e.cellNode && (e.cellX > 0 && e.cellX < this.overResizeWidth);
			return t;
		},

		overRightResizeArea: function(e){
			// We are never over a resize area if we are in the process of moving
			if(dojo.hasClass(dojo.body(), "dojoDndMove")){
				return false;
			}
			//Bugfix for crazy IE problem (#8807).  IE returns position information for the icon and text arrow divs
			//as if they were still on the left instead of returning the position they were 'float: right' to.
			//So, the resize check ends up checking the wrong adjacent cell.  This checks to see if the hover was over
			//the image or text nodes, then just ignored them/treat them not in scale range.
			if(dojo.isIE){
				var tN = e.target;
				if(dojo.hasClass(tN, "dojoxGridArrowButtonNode") ||
					dojo.hasClass(tN, "dojoxGridArrowButtonChar")){
					return false;
				}
			}

			if(dojo._isBodyLtr()){
				return e.cellNode && (e.cellX >= e.cellNode.offsetWidth - this.overResizeWidth);
			}
			return (e.cellIndex>0) && (e.cellX >= e.cellNode.offsetWidth - this.overResizeWidth) && this.prepareResize(e, -1);
		},

		domousemove: function(e){
			//console.log(e.cellIndex, e.cellX, e.cellNode.offsetWidth);
			if(!this.moveable){
				var c = (this.overRightResizeArea(e) ? 'dojoxGridColResize' : (this.overLeftResizeArea(e) ? 'dojoxGridColResize' : ''));
				if(c && !this.canResize(e)){
					c = 'dojoxGridColNoResize';
				}
				dojo.toggleClass(e.sourceView.headerNode, "dojoxGridColNoResize", (c == "dojoxGridColNoResize"));
				dojo.toggleClass(e.sourceView.headerNode, "dojoxGridColResize", (c == "dojoxGridColResize"));
				if(dojo.isIE){
					var t = e.sourceView.headerNode.scrollLeft;
					e.sourceView.headerNode.scrollLeft = t;
				}
				if(c){
					dojo.stopEvent(e);
				}
			}
		},

		domousedown: function(e){
			if(!this.moveable){
				if((this.overRightResizeArea(e) || this.overLeftResizeArea(e)) && this.canResize(e)){
					this.beginColumnResize(e);
				}else{
					this.grid.onMouseDown(e);
					this.grid.onMouseOverRow(e);
				}
				//else{
				//	this.beginMoveColumn(e);
				//}
			}
		},

		doclick: function(e) {
			if(this._skipBogusClicks){
				dojo.stopEvent(e);
				return true;
			}
			return false;
		},

		// column resizing
		colResizeSetup: function(/*Event Object*/e, /*boolean*/ isMouse ){
			//Set up the drag object for column resizing
			// Called with mouse event in case of drag and drop,
			// Also called from keyboard shift-arrow event when focus is on a header
			var headContentBox = dojo.contentBox(e.sourceView.headerNode);
			
			if(isMouse){  //IE draws line even with no mouse down so separate from keyboard
				this.lineDiv = document.createElement('div');

				// NOTE: this is for backwards compatibility with Dojo 1.3
				var vw = (dojo.position||dojo._abs)(e.sourceView.headerNode, true);
				var bodyContentBox = dojo.contentBox(e.sourceView.domNode);
				//fix #11340
				var l = e.pageX;
				if(!dojo._isBodyLtr() && dojo.isIE < 8){
					l -= dojox.html.metrics.getScrollbar().w;
				}
				dojo.style(this.lineDiv, {
					top: vw.y + "px",
					left: l + "px",
					height: (bodyContentBox.h + headContentBox.h) + "px"
				});
				dojo.addClass(this.lineDiv, "dojoxGridResizeColLine");
				this.lineDiv._origLeft = l;
				dojo.body().appendChild(this.lineDiv);
			}
			var spanners = [], nodes = this.tableMap.findOverlappingNodes(e.cellNode);
			for(var i=0, cell; (cell=nodes[i]); i++){
				spanners.push({ node: cell, index: this.getCellNodeIndex(cell), width: cell.offsetWidth });
				//console.log("spanner: " + this.getCellNodeIndex(cell));
			}

			var view = e.sourceView;
			var adj = dojo._isBodyLtr() ? 1 : -1;
			var views = e.grid.views.views;
			var followers = [];
			for(var j=view.idx+adj, cView; (cView=views[j]); j=j+adj){
				followers.push({ node: cView.headerNode, left: window.parseInt(cView.headerNode.style.left) });
			}
			var table = view.headerContentNode.firstChild;
			var drag = {
				scrollLeft: e.sourceView.headerNode.scrollLeft,
				view: view,
				node: e.cellNode,
				index: e.cellIndex,
				w: dojo.contentBox(e.cellNode).w,
				vw: headContentBox.w,
				table: table,
				tw: dojo.contentBox(table).w,
				spanners: spanners,
				followers: followers
			};
			return drag;
		},
		beginColumnResize: function(e){
			this.moverDiv = document.createElement("div");
			dojo.style(this.moverDiv,{position: "absolute", left:0}); // to make DnD work with dir=rtl
			dojo.body().appendChild(this.moverDiv);
			dojo.addClass(this.grid.domNode, "dojoxGridColumnResizing");
			var m = (this.moveable = new dojo.dnd.Moveable(this.moverDiv));

			var drag = this.colResizeSetup(e,true);

			m.onMove = dojo.hitch(this, "doResizeColumn", drag);

			dojo.connect(m, "onMoveStop", dojo.hitch(this, function(){
				this.endResizeColumn(drag);
				if(drag.node.releaseCapture){
					drag.node.releaseCapture();
				}
				this.moveable.destroy();
				delete this.moveable;
				this.moveable = null;
				dojo.removeClass(this.grid.domNode, "dojoxGridColumnResizing");
			}));

			if(e.cellNode.setCapture){
				e.cellNode.setCapture();
			}
			m.onMouseDown(e);
		},

		doResizeColumn: function(inDrag, mover, leftTop){
			var changeX = leftTop.l;
			var data = {
				deltaX: changeX,
				w: inDrag.w + (dojo._isBodyLtr() ? changeX : -changeX),//fix #11341
				vw: inDrag.vw + changeX,
				tw: inDrag.tw + changeX
			};
			
			this.dragRecord = {inDrag: inDrag, mover: mover, leftTop:leftTop};
			
			if(data.w >= this.minColWidth){
				if (!mover) { // we are using keyboard do immediate resize
					this.doResizeNow(inDrag, data);
				}
				else{
					dojo.style(this.lineDiv, "left", (this.lineDiv._origLeft + data.deltaX) + "px");
				}
			}
		},

		endResizeColumn: function(inDrag){
			if(this.dragRecord){
				var leftTop = this.dragRecord.leftTop;
				var changeX = dojo._isBodyLtr() ? leftTop.l : -leftTop.l;
				// Make sure we are not under our minimum
				// http://bugs.dojotoolkit.org/ticket/9390
				changeX += Math.max(inDrag.w + changeX, this.minColWidth) - (inDrag.w + changeX);
				if(dojo.isWebKit && inDrag.spanners.length){
					// Webkit needs the pad border extents back in
					changeX += dojo._getPadBorderExtents(inDrag.spanners[0].node).w;
				}
				var data = {
					deltaX: changeX,
					w: inDrag.w + changeX,
					vw: inDrag.vw + changeX,
					tw: inDrag.tw + changeX
				};
				// Only resize the columns when the drag has finished
				this.doResizeNow(inDrag, data);
				delete this.dragRecord;
			}
			
			dojo.destroy(this.lineDiv);
 			dojo.destroy(this.moverDiv);
			dojo.destroy(this.moverDiv);
			delete this.moverDiv;
			this._skipBogusClicks = true;
			inDrag.view.update();
			this._skipBogusClicks = false;
			this.grid.onResizeColumn(inDrag.index);
		},
		doResizeNow: function(inDrag, data){
			inDrag.view.convertColPctToFixed();
			if(inDrag.view.flexCells && !inDrag.view.testFlexCells()){
				var t = findTable(inDrag.node);
				if(t){
					(t.style.width = '');
				}
			}
			var i, s, sw, f, fl;
			for(i=0; (s=inDrag.spanners[i]); i++){
				sw = s.width + data.deltaX;
				if(sw > 0){
					s.node.style.width = sw + 'px';
					inDrag.view.setColWidth(s.index, sw);
				}
			}
			if(dojo._isBodyLtr() || !dojo.isIE){//fix #11339
				for(i=0; (f=inDrag.followers[i]); i++){
					fl = f.left + data.deltaX;
					f.node.style.left = fl + 'px';
				}
			}
			inDrag.node.style.width = data.w + 'px';
			inDrag.view.setColWidth(inDrag.index, data.w);
			inDrag.view.headerNode.style.width = data.vw + 'px';
			inDrag.view.setColumnsWidth(data.tw);
			if(!dojo._isBodyLtr()){
				inDrag.view.headerNode.scrollLeft = inDrag.scrollLeft + data.deltaX;
			}
		}
	});

	// Maps an html table into a structure parsable for information about cell row and col spanning.
	// Used by HeaderBuilder.
	dg._TableMap = dojo.extend(function(rows){
		this.mapRows(rows);
	},{
		map: null,

		mapRows: function(inRows){
			// summary: Map table topography

			//console.log('mapRows');
			// # of rows
			var rowCount = inRows.length;
			if(!rowCount){
				return;
			}
			// map which columns and rows fill which cells
			this.map = [];
			var row;
			for(var k=0; (row=inRows[k]); k++){
				this.map[k] = [];
			}
			for(var j=0; (row=inRows[j]); j++){
				for(var i=0, x=0, cell, colSpan, rowSpan; (cell=row[i]); i++){
					while(this.map[j][x]){x++;}
					this.map[j][x] = { c: i, r: j };
					rowSpan = cell.rowSpan || 1;
					colSpan = cell.colSpan || 1;
					for(var y=0; y<rowSpan; y++){
						for(var s=0; s<colSpan; s++){
							this.map[j+y][x+s] = this.map[j][x];
						}
					}
					x += colSpan;
				}
			}
			//this.dumMap();
		},

		dumpMap: function(){
			for(var j=0, row, h=''; (row=this.map[j]); j++,h=''){
				for(var i=0, cell; (cell=row[i]); i++){
					h += cell.r + ',' + cell.c + '   ';
				}
			}
		},

		getMapCoords: function(inRow, inCol){
			// summary: Find node's map coords by it's structure coords
			for(var j=0, row; (row=this.map[j]); j++){
				for(var i=0, cell; (cell=row[i]); i++){
					if(cell.c==inCol && cell.r == inRow){
						return { j: j, i: i };
					}
					//else{console.log(inRow, inCol, ' : ', i, j, " : ", cell.r, cell.c); };
				}
			}
			return { j: -1, i: -1 };
		},
		
		getNode: function(inTable, inRow, inCol){
			// summary: Find a node in inNode's table with the given structure coords
			var row = inTable && inTable.rows[inRow];
			return row && row.cells[inCol];
		},
		
		_findOverlappingNodes: function(inTable, inRow, inCol){
			var nodes = [];
			var m = this.getMapCoords(inRow, inCol);
			//console.log("node j: %d, i: %d", m.j, m.i);
			for(var j=0, row; (row=this.map[j]); j++){
				if(j == m.j){ continue; }
				var rw = row[m.i];
				//console.log("overlaps: r: %d, c: %d", rw.r, rw.c);
				var n = (rw?this.getNode(inTable, rw.r, rw.c):null);
				if(n){ nodes.push(n); }
			}
			//console.log(nodes);
			return nodes;
		},
		
		findOverlappingNodes: function(inNode){
			return this._findOverlappingNodes(findTable(inNode), getTrIndex(inNode.parentNode), getTdIndex(inNode));
		}
	});
})();
