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475 lines
14 KiB
JavaScript
475 lines
14 KiB
JavaScript
dojo.provide("dojox.grid._Scroller");
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(function(){
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var indexInParent = function(inNode){
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var i=0, n, p=inNode.parentNode;
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while((n = p.childNodes[i++])){
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if(n == inNode){
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return i - 1;
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}
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}
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return -1;
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};
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var cleanNode = function(inNode){
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if(!inNode){
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return;
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}
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var filter = function(inW){
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return inW.domNode && dojo.isDescendant(inW.domNode, inNode, true);
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}
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var ws = dijit.registry.filter(filter);
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for(var i=0, w; (w=ws[i]); i++){
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w.destroy();
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}
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delete ws;
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};
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var getTagName = function(inNodeOrId){
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var node = dojo.byId(inNodeOrId);
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return (node && node.tagName ? node.tagName.toLowerCase() : '');
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};
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var nodeKids = function(inNode, inTag){
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var result = [];
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var i=0, n;
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while((n = inNode.childNodes[i++])){
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if(getTagName(n) == inTag){
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result.push(n);
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}
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}
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return result;
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};
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var divkids = function(inNode){
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return nodeKids(inNode, 'div');
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};
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dojo.declare("dojox.grid._Scroller", null, {
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constructor: function(inContentNodes){
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this.setContentNodes(inContentNodes);
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this.pageHeights = [];
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this.pageNodes = [];
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this.stack = [];
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},
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// specified
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rowCount: 0, // total number of rows to manage
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defaultRowHeight: 32, // default height of a row
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keepRows: 100, // maximum number of rows that should exist at one time
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contentNode: null, // node to contain pages
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scrollboxNode: null, // node that controls scrolling
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// calculated
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defaultPageHeight: 0, // default height of a page
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keepPages: 10, // maximum number of pages that should exists at one time
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pageCount: 0,
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windowHeight: 0,
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firstVisibleRow: 0,
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lastVisibleRow: 0,
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averageRowHeight: 0, // the average height of a row
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// private
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page: 0,
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pageTop: 0,
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// init
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init: function(inRowCount, inKeepRows, inRowsPerPage){
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switch(arguments.length){
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case 3: this.rowsPerPage = inRowsPerPage;
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case 2: this.keepRows = inKeepRows;
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case 1: this.rowCount = inRowCount;
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}
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this.defaultPageHeight = this.defaultRowHeight * this.rowsPerPage;
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this.pageCount = this._getPageCount(this.rowCount, this.rowsPerPage);
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this.setKeepInfo(this.keepRows);
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this.invalidate();
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if(this.scrollboxNode){
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this.scrollboxNode.scrollTop = 0;
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this.scroll(0);
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this.scrollboxNode.onscroll = dojo.hitch(this, 'onscroll');
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}
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},
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_getPageCount: function(rowCount, rowsPerPage){
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return rowCount ? (Math.ceil(rowCount / rowsPerPage) || 1) : 0;
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},
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destroy: function(){
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this.invalidateNodes();
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delete this.contentNodes;
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delete this.contentNode;
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delete this.scrollboxNode;
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},
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setKeepInfo: function(inKeepRows){
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this.keepRows = inKeepRows;
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this.keepPages = !this.keepRows ? this.keepRows : Math.max(Math.ceil(this.keepRows / this.rowsPerPage), 2);
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},
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// nodes
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setContentNodes: function(inNodes){
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this.contentNodes = inNodes;
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this.colCount = (this.contentNodes ? this.contentNodes.length : 0);
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this.pageNodes = [];
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for(var i=0; i<this.colCount; i++){
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this.pageNodes[i] = [];
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}
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},
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getDefaultNodes: function(){
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return this.pageNodes[0] || [];
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},
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// updating
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invalidate: function(){
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this.invalidateNodes();
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this.pageHeights = [];
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this.height = (this.pageCount ? (this.pageCount - 1)* this.defaultPageHeight + this.calcLastPageHeight() : 0);
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this.resize();
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},
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updateRowCount: function(inRowCount){
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this.invalidateNodes();
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this.rowCount = inRowCount;
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// update page count, adjust document height
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var oldPageCount = this.pageCount;
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if(oldPageCount === 0){
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//We want to have at least 1px in height to keep scroller. Otherwise with an
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//empty grid you can't scroll to see the header.
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this.height = 1;
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}
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this.pageCount = this._getPageCount(this.rowCount, this.rowsPerPage);
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if(this.pageCount < oldPageCount){
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for(var i=oldPageCount-1; i>=this.pageCount; i--){
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this.height -= this.getPageHeight(i);
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delete this.pageHeights[i]
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}
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}else if(this.pageCount > oldPageCount){
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this.height += this.defaultPageHeight * (this.pageCount - oldPageCount - 1) + this.calcLastPageHeight();
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}
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this.resize();
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},
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// implementation for page manager
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pageExists: function(inPageIndex){
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return Boolean(this.getDefaultPageNode(inPageIndex));
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},
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measurePage: function(inPageIndex){
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var n = this.getDefaultPageNode(inPageIndex);
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return (n&&n.innerHTML) ? n.offsetHeight : 0;
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},
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positionPage: function(inPageIndex, inPos){
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for(var i=0; i<this.colCount; i++){
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this.pageNodes[i][inPageIndex].style.top = inPos + 'px';
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}
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},
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repositionPages: function(inPageIndex){
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var nodes = this.getDefaultNodes();
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var last = 0;
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for(var i=0; i<this.stack.length; i++){
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last = Math.max(this.stack[i], last);
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}
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//
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var n = nodes[inPageIndex];
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var y = (n ? this.getPageNodePosition(n) + this.getPageHeight(inPageIndex) : 0);
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//console.log('detected height change, repositioning from #%d (%d) @ %d ', inPageIndex + 1, last, y, this.pageHeights[0]);
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//
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for(var p=inPageIndex+1; p<=last; p++){
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n = nodes[p];
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if(n){
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//console.log('#%d @ %d', inPageIndex, y, this.getPageNodePosition(n));
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if(this.getPageNodePosition(n) == y){
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return;
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}
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//console.log('placing page %d at %d', p, y);
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this.positionPage(p, y);
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}
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y += this.getPageHeight(p);
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}
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},
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installPage: function(inPageIndex){
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for(var i=0; i<this.colCount; i++){
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this.contentNodes[i].appendChild(this.pageNodes[i][inPageIndex]);
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}
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},
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preparePage: function(inPageIndex, inReuseNode){
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var p = (inReuseNode ? this.popPage() : null);
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for(var i=0; i<this.colCount; i++){
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var nodes = this.pageNodes[i];
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var new_p = (p === null ? this.createPageNode() : this.invalidatePageNode(p, nodes));
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new_p.pageIndex = inPageIndex;
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new_p.id = (this._pageIdPrefix || "") + 'page-' + inPageIndex;
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nodes[inPageIndex] = new_p;
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}
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},
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// rendering implementation
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renderPage: function(inPageIndex){
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var nodes = [];
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for(var i=0; i<this.colCount; i++){
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nodes[i] = this.pageNodes[i][inPageIndex];
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}
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for(var i=0, j=inPageIndex*this.rowsPerPage; (i<this.rowsPerPage)&&(j<this.rowCount); i++, j++){
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this.renderRow(j, nodes);
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}
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},
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removePage: function(inPageIndex){
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for(var i=0, j=inPageIndex*this.rowsPerPage; i<this.rowsPerPage; i++, j++){
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this.removeRow(j);
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}
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},
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destroyPage: function(inPageIndex){
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for(var i=0; i<this.colCount; i++){
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var n = this.invalidatePageNode(inPageIndex, this.pageNodes[i]);
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if(n){
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dojo.destroy(n);
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}
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}
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},
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pacify: function(inShouldPacify){
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},
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// pacification
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pacifying: false,
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pacifyTicks: 200,
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setPacifying: function(inPacifying){
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if(this.pacifying != inPacifying){
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this.pacifying = inPacifying;
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this.pacify(this.pacifying);
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}
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},
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startPacify: function(){
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this.startPacifyTicks = new Date().getTime();
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},
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doPacify: function(){
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var result = (new Date().getTime() - this.startPacifyTicks) > this.pacifyTicks;
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this.setPacifying(true);
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this.startPacify();
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return result;
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},
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endPacify: function(){
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this.setPacifying(false);
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},
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// default sizing implementation
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resize: function(){
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if(this.scrollboxNode){
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this.windowHeight = this.scrollboxNode.clientHeight;
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}
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for(var i=0; i<this.colCount; i++){
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//We want to have 1px in height min to keep scroller. Otherwise can't scroll
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//and see header in empty grid.
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dojox.grid.util.setStyleHeightPx(this.contentNodes[i], Math.max(1,this.height));
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}
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// Calculate the average row height and update the defaults (row and page).
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this.needPage(this.page, this.pageTop);
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var rowsOnPage = (this.page < this.pageCount - 1) ? this.rowsPerPage : ((this.rowCount % this.rowsPerPage) || this.rowsPerPage);
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var pageHeight = this.getPageHeight(this.page);
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this.averageRowHeight = (pageHeight > 0 && rowsOnPage > 0) ? (pageHeight / rowsOnPage) : 0;
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},
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calcLastPageHeight: function(){
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if(!this.pageCount){
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return 0;
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}
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var lastPage = this.pageCount - 1;
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var lastPageHeight = ((this.rowCount % this.rowsPerPage)||(this.rowsPerPage)) * this.defaultRowHeight;
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this.pageHeights[lastPage] = lastPageHeight;
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return lastPageHeight;
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},
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updateContentHeight: function(inDh){
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this.height += inDh;
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this.resize();
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},
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updatePageHeight: function(inPageIndex){
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if(this.pageExists(inPageIndex)){
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var oh = this.getPageHeight(inPageIndex);
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var h = (this.measurePage(inPageIndex))||(oh);
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this.pageHeights[inPageIndex] = h;
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if((h)&&(oh != h)){
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this.updateContentHeight(h - oh)
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this.repositionPages(inPageIndex);
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}
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}
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},
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rowHeightChanged: function(inRowIndex){
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this.updatePageHeight(Math.floor(inRowIndex / this.rowsPerPage));
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},
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// scroller core
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invalidateNodes: function(){
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while(this.stack.length){
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this.destroyPage(this.popPage());
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}
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},
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createPageNode: function(){
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var p = document.createElement('div');
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dojo.attr(p,"role","presentation");
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p.style.position = 'absolute';
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//p.style.width = '100%';
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p.style[dojo._isBodyLtr() ? "left" : "right"] = '0';
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return p;
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},
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getPageHeight: function(inPageIndex){
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var ph = this.pageHeights[inPageIndex];
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return (ph !== undefined ? ph : this.defaultPageHeight);
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},
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// FIXME: this is not a stack, it's a FIFO list
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pushPage: function(inPageIndex){
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return this.stack.push(inPageIndex);
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},
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popPage: function(){
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return this.stack.shift();
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},
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findPage: function(inTop){
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var i = 0, h = 0;
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for(var ph = 0; i<this.pageCount; i++, h += ph){
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ph = this.getPageHeight(i);
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if(h + ph >= inTop){
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break;
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}
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}
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this.page = i;
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this.pageTop = h;
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},
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buildPage: function(inPageIndex, inReuseNode, inPos){
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this.preparePage(inPageIndex, inReuseNode);
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this.positionPage(inPageIndex, inPos);
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// order of operations is key below
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this.installPage(inPageIndex);
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this.renderPage(inPageIndex);
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// order of operations is key above
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this.pushPage(inPageIndex);
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},
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needPage: function(inPageIndex, inPos){
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var h = this.getPageHeight(inPageIndex), oh = h;
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if(!this.pageExists(inPageIndex)){
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this.buildPage(inPageIndex, this.keepPages&&(this.stack.length >= this.keepPages), inPos);
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h = this.measurePage(inPageIndex) || h;
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this.pageHeights[inPageIndex] = h;
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if(h && (oh != h)){
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this.updateContentHeight(h - oh)
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}
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}else{
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this.positionPage(inPageIndex, inPos);
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}
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return h;
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},
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onscroll: function(){
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this.scroll(this.scrollboxNode.scrollTop);
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},
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scroll: function(inTop){
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this.grid.scrollTop = inTop;
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if(this.colCount){
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this.startPacify();
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this.findPage(inTop);
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var h = this.height;
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var b = this.getScrollBottom(inTop);
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for(var p=this.page, y=this.pageTop; (p<this.pageCount)&&((b<0)||(y<b)); p++){
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y += this.needPage(p, y);
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}
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this.firstVisibleRow = this.getFirstVisibleRow(this.page, this.pageTop, inTop);
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this.lastVisibleRow = this.getLastVisibleRow(p - 1, y, b);
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// indicates some page size has been updated
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if(h != this.height){
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this.repositionPages(p-1);
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}
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this.endPacify();
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}
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},
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getScrollBottom: function(inTop){
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return (this.windowHeight >= 0 ? inTop + this.windowHeight : -1);
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},
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// events
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processNodeEvent: function(e, inNode){
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var t = e.target;
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while(t && (t != inNode) && t.parentNode && (t.parentNode.parentNode != inNode)){
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t = t.parentNode;
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}
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if(!t || !t.parentNode || (t.parentNode.parentNode != inNode)){
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return false;
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}
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var page = t.parentNode;
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e.topRowIndex = page.pageIndex * this.rowsPerPage;
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e.rowIndex = e.topRowIndex + indexInParent(t);
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e.rowTarget = t;
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return true;
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},
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processEvent: function(e){
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return this.processNodeEvent(e, this.contentNode);
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},
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// virtual rendering interface
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renderRow: function(inRowIndex, inPageNode){
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},
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removeRow: function(inRowIndex){
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},
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// page node operations
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getDefaultPageNode: function(inPageIndex){
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return this.getDefaultNodes()[inPageIndex];
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},
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positionPageNode: function(inNode, inPos){
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},
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getPageNodePosition: function(inNode){
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return inNode.offsetTop;
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},
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invalidatePageNode: function(inPageIndex, inNodes){
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var p = inNodes[inPageIndex];
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if(p){
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delete inNodes[inPageIndex];
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this.removePage(inPageIndex, p);
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cleanNode(p);
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p.innerHTML = '';
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}
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return p;
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},
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// scroll control
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getPageRow: function(inPage){
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return inPage * this.rowsPerPage;
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},
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getLastPageRow: function(inPage){
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return Math.min(this.rowCount, this.getPageRow(inPage + 1)) - 1;
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},
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getFirstVisibleRow: function(inPage, inPageTop, inScrollTop){
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if(!this.pageExists(inPage)){
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return 0;
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}
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var row = this.getPageRow(inPage);
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var nodes = this.getDefaultNodes();
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var rows = divkids(nodes[inPage]);
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for(var i=0,l=rows.length; i<l && inPageTop<inScrollTop; i++, row++){
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inPageTop += rows[i].offsetHeight;
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}
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return (row ? row - 1 : row);
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},
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getLastVisibleRow: function(inPage, inBottom, inScrollBottom){
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if(!this.pageExists(inPage)){
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return 0;
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}
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var nodes = this.getDefaultNodes();
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var row = this.getLastPageRow(inPage);
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var rows = divkids(nodes[inPage]);
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for(var i=rows.length-1; i>=0 && inBottom>inScrollBottom; i--, row--){
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inBottom -= rows[i].offsetHeight;
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}
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return row + 1;
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},
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findTopRow: function(inScrollTop){
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var nodes = this.getDefaultNodes();
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var rows = divkids(nodes[this.page]);
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for(var i=0,l=rows.length,t=this.pageTop,h; i<l; i++){
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h = rows[i].offsetHeight;
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t += h;
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if(t >= inScrollTop){
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this.offset = h - (t - inScrollTop);
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return i + this.page * this.rowsPerPage;
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}
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}
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return -1;
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},
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findScrollTop: function(inRow){
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var rowPage = Math.floor(inRow / this.rowsPerPage);
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var t = 0;
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for(var i=0; i<rowPage; i++){
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t += this.getPageHeight(i);
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}
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this.pageTop = t;
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this.needPage(rowPage, this.pageTop);
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var nodes = this.getDefaultNodes();
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var rows = divkids(nodes[rowPage]);
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var r = inRow - this.rowsPerPage * rowPage;
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for(var i=0,l=rows.length; i<l && i<r; i++){
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t += rows[i].offsetHeight;
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}
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return t;
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},
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dummy: 0
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});
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})();
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