--- /dev/null
+if(!dojo._hasResource['dojox.grid._grid.scroller']){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
+dojo._hasResource['dojox.grid._grid.scroller'] = true;
+dojo.provide('dojox.grid._grid.scroller');
+
+dojo.declare('dojox.grid.scroller.base', null, {
+ // summary:
+ // virtual scrollbox, abstract class
+ // Content must in /rows/
+ // Rows are managed in contiguous sets called /pages/
+ // There are a fixed # of rows per page
+ // The minimum rendered unit is a page
+ constructor: function(){
+ this.pageHeights = [];
+ this.stack = [];
+ },
+ // specified
+ rowCount: 0, // total number of rows to manage
+ defaultRowHeight: 10, // default height of a row
+ keepRows: 100, // maximum number of rows that should exist at one time
+ contentNode: null, // node to contain pages
+ scrollboxNode: null, // node that controls scrolling
+ // calculated
+ defaultPageHeight: 0, // default height of a page
+ keepPages: 10, // maximum number of pages that should exists at one time
+ pageCount: 0,
+ windowHeight: 0,
+ firstVisibleRow: 0,
+ lastVisibleRow: 0,
+ // private
+ page: 0,
+ pageTop: 0,
+ // init
+ init: function(inRowCount, inKeepRows, inRowsPerPage){
+ switch(arguments.length){
+ case 3: this.rowsPerPage = inRowsPerPage;
+ case 2: this.keepRows = inKeepRows;
+ case 1: this.rowCount = inRowCount;
+ }
+ this.defaultPageHeight = this.defaultRowHeight * this.rowsPerPage;
+ //this.defaultPageHeight = this.defaultRowHeight * Math.min(this.rowsPerPage, this.rowCount);
+ this.pageCount = Math.ceil(this.rowCount / this.rowsPerPage);
+ this.setKeepInfo(this.keepRows);
+ this.invalidate();
+ if(this.scrollboxNode){
+ this.scrollboxNode.scrollTop = 0;
+ this.scroll(0);
+ this.scrollboxNode.onscroll = dojo.hitch(this, 'onscroll');
+ }
+ },
+ setKeepInfo: function(inKeepRows){
+ this.keepRows = inKeepRows;
+ this.keepPages = !this.keepRows ? this.keepRows : Math.max(Math.ceil(this.keepRows / this.rowsPerPage), 2);
+ },
+ // updating
+ invalidate: function(){
+ this.invalidateNodes();
+ this.pageHeights = [];
+ this.height = (this.pageCount ? (this.pageCount - 1)* this.defaultPageHeight + this.calcLastPageHeight() : 0);
+ this.resize();
+ },
+ updateRowCount: function(inRowCount){
+ this.invalidateNodes();
+ this.rowCount = inRowCount;
+ // update page count, adjust document height
+ oldPageCount = this.pageCount;
+ this.pageCount = Math.ceil(this.rowCount / this.rowsPerPage);
+ if(this.pageCount < oldPageCount){
+ for(var i=oldPageCount-1; i>=this.pageCount; i--){
+ this.height -= this.getPageHeight(i);
+ delete this.pageHeights[i]
+ }
+ }else if(this.pageCount > oldPageCount){
+ this.height += this.defaultPageHeight * (this.pageCount - oldPageCount - 1) + this.calcLastPageHeight();
+ }
+ this.resize();
+ },
+ // abstract interface
+ pageExists: function(inPageIndex){
+ },
+ measurePage: function(inPageIndex){
+ },
+ positionPage: function(inPageIndex, inPos){
+ },
+ repositionPages: function(inPageIndex){
+ },
+ installPage: function(inPageIndex){
+ },
+ preparePage: function(inPageIndex, inPos, inReuseNode){
+ },
+ renderPage: function(inPageIndex){
+ },
+ removePage: function(inPageIndex){
+ },
+ pacify: function(inShouldPacify){
+ },
+ // pacification
+ pacifying: false,
+ pacifyTicks: 200,
+ setPacifying: function(inPacifying){
+ if(this.pacifying != inPacifying){
+ this.pacifying = inPacifying;
+ this.pacify(this.pacifying);
+ }
+ },
+ startPacify: function(){
+ this.startPacifyTicks = new Date().getTime();
+ },
+ doPacify: function(){
+ var result = (new Date().getTime() - this.startPacifyTicks) > this.pacifyTicks;
+ this.setPacifying(true);
+ this.startPacify();
+ return result;
+ },
+ endPacify: function(){
+ this.setPacifying(false);
+ },
+ // default sizing implementation
+ resize: function(){
+ if(this.scrollboxNode){
+ this.windowHeight = this.scrollboxNode.clientHeight;
+ }
+ dojox.grid.setStyleHeightPx(this.contentNode, this.height);
+ },
+ calcLastPageHeight: function(){
+ if(!this.pageCount){
+ return 0;
+ }
+ var lastPage = this.pageCount - 1;
+ var lastPageHeight = ((this.rowCount % this.rowsPerPage)||(this.rowsPerPage)) * this.defaultRowHeight;
+ this.pageHeights[lastPage] = lastPageHeight;
+ return lastPageHeight;
+ },
+ updateContentHeight: function(inDh){
+ this.height += inDh;
+ this.resize();
+ },
+ updatePageHeight: function(inPageIndex){
+ if(this.pageExists(inPageIndex)){
+ var oh = this.getPageHeight(inPageIndex);
+ var h = (this.measurePage(inPageIndex))||(oh);
+ this.pageHeights[inPageIndex] = h;
+ if((h)&&(oh != h)){
+ this.updateContentHeight(h - oh)
+ this.repositionPages(inPageIndex);
+ }
+ }
+ },
+ rowHeightChanged: function(inRowIndex){
+ this.updatePageHeight(Math.floor(inRowIndex / this.rowsPerPage));
+ },
+ // scroller core
+ invalidateNodes: function(){
+ while(this.stack.length){
+ this.destroyPage(this.popPage());
+ }
+ },
+ createPageNode: function(){
+ var p = document.createElement('div');
+ p.style.position = 'absolute';
+ //p.style.width = '100%';
+ p.style[dojo._isBodyLtr() ? "left" : "right"] = '0';
+ return p;
+ },
+ getPageHeight: function(inPageIndex){
+ var ph = this.pageHeights[inPageIndex];
+ return (ph !== undefined ? ph : this.defaultPageHeight);
+ },
+ // FIXME: this is not a stack, it's a FIFO list
+ pushPage: function(inPageIndex){
+ return this.stack.push(inPageIndex);
+ },
+ popPage: function(){
+ return this.stack.shift();
+ },
+ findPage: function(inTop){
+ var i = 0, h = 0;
+ for(var ph = 0; i<this.pageCount; i++, h += ph){
+ ph = this.getPageHeight(i);
+ if(h + ph >= inTop){
+ break;
+ }
+ }
+ this.page = i;
+ this.pageTop = h;
+ },
+ buildPage: function(inPageIndex, inReuseNode, inPos){
+ this.preparePage(inPageIndex, inReuseNode);
+ this.positionPage(inPageIndex, inPos);
+ // order of operations is key below
+ this.installPage(inPageIndex);
+ this.renderPage(inPageIndex);
+ // order of operations is key above
+ this.pushPage(inPageIndex);
+ },
+ needPage: function(inPageIndex, inPos){
+ var h = this.getPageHeight(inPageIndex), oh = h;
+ if(!this.pageExists(inPageIndex)){
+ this.buildPage(inPageIndex, this.keepPages&&(this.stack.length >= this.keepPages), inPos);
+ h = this.measurePage(inPageIndex) || h;
+ this.pageHeights[inPageIndex] = h;
+ if(h && (oh != h)){
+ this.updateContentHeight(h - oh)
+ }
+ }else{
+ this.positionPage(inPageIndex, inPos);
+ }
+ return h;
+ },
+ onscroll: function(){
+ this.scroll(this.scrollboxNode.scrollTop);
+ },
+ scroll: function(inTop){
+ this.startPacify();
+ this.findPage(inTop);
+ var h = this.height;
+ var b = this.getScrollBottom(inTop);
+ for(var p=this.page, y=this.pageTop; (p<this.pageCount)&&((b<0)||(y<b)); p++){
+ y += this.needPage(p, y);
+ }
+ this.firstVisibleRow = this.getFirstVisibleRow(this.page, this.pageTop, inTop);
+ this.lastVisibleRow = this.getLastVisibleRow(p - 1, y, b);
+ // indicates some page size has been updated
+ if(h != this.height){
+ this.repositionPages(p-1);
+ }
+ this.endPacify();
+ },
+ getScrollBottom: function(inTop){
+ return (this.windowHeight >= 0 ? inTop + this.windowHeight : -1);
+ },
+ // events
+ processNodeEvent: function(e, inNode){
+ var t = e.target;
+ while(t && (t != inNode) && t.parentNode && (t.parentNode.parentNode != inNode)){
+ t = t.parentNode;
+ }
+ if(!t || !t.parentNode || (t.parentNode.parentNode != inNode)){
+ return false;
+ }
+ var page = t.parentNode;
+ e.topRowIndex = page.pageIndex * this.rowsPerPage;
+ e.rowIndex = e.topRowIndex + dojox.grid.indexInParent(t);
+ e.rowTarget = t;
+ return true;
+ },
+ processEvent: function(e){
+ return this.processNodeEvent(e, this.contentNode);
+ },
+ dummy: 0
+});
+
+dojo.declare('dojox.grid.scroller', dojox.grid.scroller.base, {
+ // summary:
+ // virtual scroller class, makes no assumption about shape of items being scrolled
+ constructor: function(){
+ this.pageNodes = [];
+ },
+ // virtual rendering interface
+ renderRow: function(inRowIndex, inPageNode){
+ },
+ removeRow: function(inRowIndex){
+ },
+ // page node operations
+ getDefaultNodes: function(){
+ return this.pageNodes;
+ },
+ getDefaultPageNode: function(inPageIndex){
+ return this.getDefaultNodes()[inPageIndex];
+ },
+ positionPageNode: function(inNode, inPos){
+ inNode.style.top = inPos + 'px';
+ },
+ getPageNodePosition: function(inNode){
+ return inNode.offsetTop;
+ },
+ repositionPageNodes: function(inPageIndex, inNodes){
+ var last = 0;
+ for(var i=0; i<this.stack.length; i++){
+ last = Math.max(this.stack[i], last);
+ }
+ //
+ var n = inNodes[inPageIndex];
+ var y = (n ? this.getPageNodePosition(n) + this.getPageHeight(inPageIndex) : 0);
+ //console.log('detected height change, repositioning from #%d (%d) @ %d ', inPageIndex + 1, last, y, this.pageHeights[0]);
+ //
+ for(var p=inPageIndex+1; p<=last; p++){
+ n = inNodes[p];
+ if(n){
+ //console.log('#%d @ %d', inPageIndex, y, this.getPageNodePosition(n));
+ if(this.getPageNodePosition(n) == y){
+ return;
+ }
+ //console.log('placing page %d at %d', p, y);
+ this.positionPage(p, y);
+ }
+ y += this.getPageHeight(p);
+ }
+ },
+ invalidatePageNode: function(inPageIndex, inNodes){
+ var p = inNodes[inPageIndex];
+ if(p){
+ delete inNodes[inPageIndex];
+ this.removePage(inPageIndex, p);
+ dojox.grid.cleanNode(p);
+ p.innerHTML = '';
+ }
+ return p;
+ },
+ preparePageNode: function(inPageIndex, inReusePageIndex, inNodes){
+ var p = (inReusePageIndex === null ? this.createPageNode() : this.invalidatePageNode(inReusePageIndex, inNodes));
+ p.pageIndex = inPageIndex;
+ p.id = (this._pageIdPrefix || "") + 'page-' + inPageIndex;
+ inNodes[inPageIndex] = p;
+ },
+ // implementation for page manager
+ pageExists: function(inPageIndex){
+ return Boolean(this.getDefaultPageNode(inPageIndex));
+ },
+ measurePage: function(inPageIndex){
+ return this.getDefaultPageNode(inPageIndex).offsetHeight;
+ },
+ positionPage: function(inPageIndex, inPos){
+ this.positionPageNode(this.getDefaultPageNode(inPageIndex), inPos);
+ },
+ repositionPages: function(inPageIndex){
+ this.repositionPageNodes(inPageIndex, this.getDefaultNodes());
+ },
+ preparePage: function(inPageIndex, inReuseNode){
+ this.preparePageNode(inPageIndex, (inReuseNode ? this.popPage() : null), this.getDefaultNodes());
+ },
+ installPage: function(inPageIndex){
+ this.contentNode.appendChild(this.getDefaultPageNode(inPageIndex));
+ },
+ destroyPage: function(inPageIndex){
+ var p = this.invalidatePageNode(inPageIndex, this.getDefaultNodes());
+ dojox.grid.removeNode(p);
+ },
+ // rendering implementation
+ renderPage: function(inPageIndex){
+ var node = this.pageNodes[inPageIndex];
+ for(var i=0, j=inPageIndex*this.rowsPerPage; (i<this.rowsPerPage)&&(j<this.rowCount); i++, j++){
+ this.renderRow(j, node);
+ }
+ },
+ removePage: function(inPageIndex){
+ for(var i=0, j=inPageIndex*this.rowsPerPage; i<this.rowsPerPage; i++, j++){
+ this.removeRow(j);
+ }
+ },
+ // scroll control
+ getPageRow: function(inPage){
+ return inPage * this.rowsPerPage;
+ },
+ getLastPageRow: function(inPage){
+ return Math.min(this.rowCount, this.getPageRow(inPage + 1)) - 1;
+ },
+ getFirstVisibleRowNodes: function(inPage, inPageTop, inScrollTop, inNodes){
+ var row = this.getPageRow(inPage);
+ var rows = dojox.grid.divkids(inNodes[inPage]);
+ for(var i=0,l=rows.length; i<l && inPageTop<inScrollTop; i++, row++){
+ inPageTop += rows[i].offsetHeight;
+ }
+ return (row ? row - 1 : row);
+ },
+ getFirstVisibleRow: function(inPage, inPageTop, inScrollTop){
+ if(!this.pageExists(inPage)){
+ return 0;
+ }
+ return this.getFirstVisibleRowNodes(inPage, inPageTop, inScrollTop, this.getDefaultNodes());
+ },
+ getLastVisibleRowNodes: function(inPage, inBottom, inScrollBottom, inNodes){
+ var row = this.getLastPageRow(inPage);
+ var rows = dojox.grid.divkids(inNodes[inPage]);
+ for(var i=rows.length-1; i>=0 && inBottom>inScrollBottom; i--, row--){
+ inBottom -= rows[i].offsetHeight;
+ }
+ return row + 1;
+ },
+ getLastVisibleRow: function(inPage, inBottom, inScrollBottom){
+ if(!this.pageExists(inPage)){
+ return 0;
+ }
+ return this.getLastVisibleRowNodes(inPage, inBottom, inScrollBottom, this.getDefaultNodes());
+ },
+ findTopRowForNodes: function(inScrollTop, inNodes){
+ var rows = dojox.grid.divkids(inNodes[this.page]);
+ for(var i=0,l=rows.length,t=this.pageTop,h; i<l; i++){
+ h = rows[i].offsetHeight;
+ t += h;
+ if(t >= inScrollTop){
+ this.offset = h - (t - inScrollTop);
+ return i + this.page * this.rowsPerPage;
+ }
+ }
+ return -1;
+ },
+ findScrollTopForNodes: function(inRow, inNodes){
+ var rowPage = Math.floor(inRow / this.rowsPerPage);
+ var t = 0;
+ for(var i=0; i<rowPage; i++){
+ t += this.getPageHeight(i);
+ }
+ this.pageTop = t;
+ this.needPage(rowPage, this.pageTop);
+ var rows = dojox.grid.divkids(inNodes[rowPage]);
+ var r = inRow - this.rowsPerPage * rowPage;
+ for(var i=0,l=rows.length; i<l && i<r; i++){
+ t += rows[i].offsetHeight;
+ }
+ return t;
+ },
+ findTopRow: function(inScrollTop){
+ return this.findTopRowForNodes(inScrollTop, this.getDefaultNodes());
+ },
+ findScrollTop: function(inRow){
+ return this.findScrollTopForNodes(inRow, this.getDefaultNodes());
+ },
+ dummy: 0
+});
+
+dojo.declare('dojox.grid.scroller.columns', dojox.grid.scroller, {
+ // summary:
+ // Virtual scroller class that scrolls list of columns. Owned by grid and used internally
+ // for virtual scrolling.
+ constructor: function(inContentNodes){
+ this.setContentNodes(inContentNodes);
+ },
+ // nodes
+ setContentNodes: function(inNodes){
+ this.contentNodes = inNodes;
+ this.colCount = (this.contentNodes ? this.contentNodes.length : 0);
+ this.pageNodes = [];
+ for(var i=0; i<this.colCount; i++){
+ this.pageNodes[i] = [];
+ }
+ },
+ getDefaultNodes: function(){
+ return this.pageNodes[0] || [];
+ },
+ scroll: function(inTop) {
+ if(this.colCount){
+ dojox.grid.scroller.prototype.scroll.call(this, inTop);
+ }
+ },
+ // resize
+ resize: function(){
+ if(this.scrollboxNode){
+ this.windowHeight = this.scrollboxNode.clientHeight;
+ }
+ for(var i=0; i<this.colCount; i++){
+ dojox.grid.setStyleHeightPx(this.contentNodes[i], this.height);
+ }
+ },
+ // implementation for page manager
+ positionPage: function(inPageIndex, inPos){
+ for(var i=0; i<this.colCount; i++){
+ this.positionPageNode(this.pageNodes[i][inPageIndex], inPos);
+ }
+ },
+ preparePage: function(inPageIndex, inReuseNode){
+ var p = (inReuseNode ? this.popPage() : null);
+ for(var i=0; i<this.colCount; i++){
+ this.preparePageNode(inPageIndex, p, this.pageNodes[i]);
+ }
+ },
+ installPage: function(inPageIndex){
+ for(var i=0; i<this.colCount; i++){
+ this.contentNodes[i].appendChild(this.pageNodes[i][inPageIndex]);
+ }
+ },
+ destroyPage: function(inPageIndex){
+ for(var i=0; i<this.colCount; i++){
+ dojox.grid.removeNode(this.invalidatePageNode(inPageIndex, this.pageNodes[i]));
+ }
+ },
+ // rendering implementation
+ renderPage: function(inPageIndex){
+ var nodes = [];
+ for(var i=0; i<this.colCount; i++){
+ nodes[i] = this.pageNodes[i][inPageIndex];
+ }
+ //this.renderRows(inPageIndex*this.rowsPerPage, this.rowsPerPage, nodes);
+ for(var i=0, j=inPageIndex*this.rowsPerPage; (i<this.rowsPerPage)&&(j<this.rowCount); i++, j++){
+ this.renderRow(j, nodes);
+ }
+ }
+});
+
+}
projects / eow / blobdiff