2150 |
mathias |
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if(!dojo._hasResource['dojox.grid._grid.scroller']){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource['dojox.grid._grid.scroller'] = true;
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dojo.provide('dojox.grid._grid.scroller');
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dojo.declare('dojox.grid.scroller.base', null, {
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// summary:
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// virtual scrollbox, abstract class
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// Content must in /rows/
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// Rows are managed in contiguous sets called /pages/
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// There are a fixed # of rows per page
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// The minimum rendered unit is a page
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constructor: function(){
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this.pageHeights = [];
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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: 10, // 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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// 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.defaultPageHeight = this.defaultRowHeight * Math.min(this.rowsPerPage, this.rowCount);
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this.pageCount = Math.ceil(this.rowCount / this.rowsPerPage);
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this.keepPages = Math.max(Math.ceil(this.keepRows / this.rowsPerPage), 2);
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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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// 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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oldPageCount = this.pageCount;
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this.pageCount = Math.ceil(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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// abstract interface
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pageExists: function(inPageIndex){
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},
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measurePage: function(inPageIndex){
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},
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positionPage: function(inPageIndex, inPos){
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},
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repositionPages: function(inPageIndex){
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},
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installPage: function(inPageIndex){
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},
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preparePage: function(inPageIndex, inPos, inReuseNode){
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},
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renderPage: function(inPageIndex){
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},
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removePage: function(inPageIndex){
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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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dojox.grid.setStyleHeightPx(this.contentNode, this.height);
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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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p.style.position = 'absolute';
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//p.style.width = '100%';
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p.style.left = '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.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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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 + dojox.grid.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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dummy: 0
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});
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dojo.declare('dojox.grid.scroller', dojox.grid.scroller.base, {
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// summary:
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// virtual scroller class, makes no assumption about shape of items being scrolled
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constructor: function(){
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this.pageNodes = [];
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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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getDefaultNodes: function(){
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return this.pageNodes;
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},
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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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inNode.style.top = inPos + 'px';
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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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repositionPageNodes: function(inPageIndex, inNodes){
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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 = inNodes[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 = inNodes[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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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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dojox.grid.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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preparePageNode: function(inPageIndex, inReusePageIndex, inNodes){
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var p = (inReusePageIndex === null ? this.createPageNode() : this.invalidatePageNode(inReusePageIndex, inNodes));
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p.pageIndex = inPageIndex;
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p.id = 'page-' + inPageIndex;
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inNodes[inPageIndex] = p;
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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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return this.getDefaultPageNode(inPageIndex).offsetHeight;
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},
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positionPage: function(inPageIndex, inPos){
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this.positionPageNode(this.getDefaultPageNode(inPageIndex), inPos);
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},
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repositionPages: function(inPageIndex){
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this.repositionPageNodes(inPageIndex, this.getDefaultNodes());
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},
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preparePage: function(inPageIndex, inReuseNode){
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this.preparePageNode(inPageIndex, (inReuseNode ? this.popPage() : null), this.getDefaultNodes());
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},
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installPage: function(inPageIndex){
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this.contentNode.appendChild(this.getDefaultPageNode(inPageIndex));
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},
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destroyPage: function(inPageIndex){
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var p = this.invalidatePageNode(inPageIndex, this.getDefaultNodes());
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dojox.grid.removeNode(p);
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},
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// rendering implementation
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renderPage: function(inPageIndex){
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var node = this.pageNodes[inPageIndex];
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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, node);
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}
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},
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removePage: function(inPageIndex){
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342 |
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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|
345 |
},
|
|
|
346 |
// scroll control
|
|
|
347 |
getPageRow: function(inPage){
|
|
|
348 |
return inPage * this.rowsPerPage;
|
|
|
349 |
},
|
|
|
350 |
getLastPageRow: function(inPage){
|
|
|
351 |
return Math.min(this.rowCount, this.getPageRow(inPage + 1)) - 1;
|
|
|
352 |
},
|
|
|
353 |
getFirstVisibleRowNodes: function(inPage, inPageTop, inScrollTop, inNodes){
|
|
|
354 |
var row = this.getPageRow(inPage);
|
|
|
355 |
var rows = dojox.grid.divkids(inNodes[inPage]);
|
|
|
356 |
for(var i=0,l=rows.length; i<l && inPageTop<inScrollTop; i++, row++){
|
|
|
357 |
inPageTop += rows[i].offsetHeight;
|
|
|
358 |
}
|
|
|
359 |
return (row ? row - 1 : row);
|
|
|
360 |
},
|
|
|
361 |
getFirstVisibleRow: function(inPage, inPageTop, inScrollTop){
|
|
|
362 |
if(!this.pageExists(inPage)){
|
|
|
363 |
return 0;
|
|
|
364 |
}
|
|
|
365 |
return this.getFirstVisibleRowNodes(inPage, inPageTop, inScrollTop, this.getDefaultNodes());
|
|
|
366 |
},
|
|
|
367 |
getLastVisibleRowNodes: function(inPage, inBottom, inScrollBottom, inNodes){
|
|
|
368 |
var row = this.getLastPageRow(inPage);
|
|
|
369 |
var rows = dojox.grid.divkids(inNodes[inPage]);
|
|
|
370 |
for(var i=rows.length-1; i>=0 && inBottom>inScrollBottom; i--, row--){
|
|
|
371 |
inBottom -= rows[i].offsetHeight;
|
|
|
372 |
}
|
|
|
373 |
return row + 1;
|
|
|
374 |
},
|
|
|
375 |
getLastVisibleRow: function(inPage, inBottom, inScrollBottom){
|
|
|
376 |
if(!this.pageExists(inPage)){
|
|
|
377 |
return 0;
|
|
|
378 |
}
|
|
|
379 |
return this.getLastVisibleRowNodes(inPage, inBottom, inScrollBottom, this.getDefaultNodes());
|
|
|
380 |
},
|
|
|
381 |
findTopRowForNodes: function(inScrollTop, inNodes){
|
|
|
382 |
var rows = dojox.grid.divkids(inNodes[this.page]);
|
|
|
383 |
for(var i=0,l=rows.length,t=this.pageTop,h; i<l; i++){
|
|
|
384 |
h = rows[i].offsetHeight;
|
|
|
385 |
t += h;
|
|
|
386 |
if(t >= inScrollTop){
|
|
|
387 |
this.offset = h - (t - inScrollTop);
|
|
|
388 |
return i + this.page * this.rowsPerPage;
|
|
|
389 |
}
|
|
|
390 |
}
|
|
|
391 |
return -1;
|
|
|
392 |
},
|
|
|
393 |
findScrollTopForNodes: function(inRow, inNodes){
|
|
|
394 |
var rowPage = Math.floor(inRow / this.rowsPerPage);
|
|
|
395 |
var t = 0;
|
|
|
396 |
for(var i=0; i<rowPage; i++){
|
|
|
397 |
t += this.getPageHeight(i);
|
|
|
398 |
}
|
|
|
399 |
this.pageTop = t;
|
|
|
400 |
this.needPage(rowPage, this.pageTop);
|
|
|
401 |
var rows = dojox.grid.divkids(inNodes[rowPage]);
|
|
|
402 |
var r = inRow - this.rowsPerPage * rowPage;
|
|
|
403 |
for(var i=0,l=rows.length; i<l && i<r; i++){
|
|
|
404 |
t += rows[i].offsetHeight;
|
|
|
405 |
}
|
|
|
406 |
return t;
|
|
|
407 |
},
|
|
|
408 |
findTopRow: function(inScrollTop){
|
|
|
409 |
return this.findTopRowForNodes(inScrollTop, this.getDefaultNodes());
|
|
|
410 |
},
|
|
|
411 |
findScrollTop: function(inRow){
|
|
|
412 |
return this.findScrollTopForNodes(inRow, this.getDefaultNodes());
|
|
|
413 |
},
|
|
|
414 |
dummy: 0
|
|
|
415 |
});
|
|
|
416 |
|
|
|
417 |
dojo.declare('dojox.grid.scroller.columns', dojox.grid.scroller, {
|
|
|
418 |
// summary:
|
|
|
419 |
// Virtual scroller class that scrolls list of columns. Owned by grid and used internally
|
|
|
420 |
// for virtual scrolling.
|
|
|
421 |
constructor: function(inContentNodes){
|
|
|
422 |
this.setContentNodes(inContentNodes);
|
|
|
423 |
},
|
|
|
424 |
// nodes
|
|
|
425 |
setContentNodes: function(inNodes){
|
|
|
426 |
this.contentNodes = inNodes;
|
|
|
427 |
this.colCount = (this.contentNodes ? this.contentNodes.length : 0);
|
|
|
428 |
this.pageNodes = [];
|
|
|
429 |
for(var i=0; i<this.colCount; i++){
|
|
|
430 |
this.pageNodes[i] = [];
|
|
|
431 |
}
|
|
|
432 |
},
|
|
|
433 |
getDefaultNodes: function(){
|
|
|
434 |
return this.pageNodes[0] || [];
|
|
|
435 |
},
|
|
|
436 |
scroll: function(inTop) {
|
|
|
437 |
if(this.colCount){
|
|
|
438 |
dojox.grid.scroller.prototype.scroll.call(this, inTop);
|
|
|
439 |
}
|
|
|
440 |
},
|
|
|
441 |
// resize
|
|
|
442 |
resize: function(){
|
|
|
443 |
if(this.scrollboxNode){
|
|
|
444 |
this.windowHeight = this.scrollboxNode.clientHeight;
|
|
|
445 |
}
|
|
|
446 |
for(var i=0; i<this.colCount; i++){
|
|
|
447 |
dojox.grid.setStyleHeightPx(this.contentNodes[i], this.height);
|
|
|
448 |
}
|
|
|
449 |
},
|
|
|
450 |
// implementation for page manager
|
|
|
451 |
positionPage: function(inPageIndex, inPos){
|
|
|
452 |
for(var i=0; i<this.colCount; i++){
|
|
|
453 |
this.positionPageNode(this.pageNodes[i][inPageIndex], inPos);
|
|
|
454 |
}
|
|
|
455 |
},
|
|
|
456 |
preparePage: function(inPageIndex, inReuseNode){
|
|
|
457 |
var p = (inReuseNode ? this.popPage() : null);
|
|
|
458 |
for(var i=0; i<this.colCount; i++){
|
|
|
459 |
this.preparePageNode(inPageIndex, p, this.pageNodes[i]);
|
|
|
460 |
}
|
|
|
461 |
},
|
|
|
462 |
installPage: function(inPageIndex){
|
|
|
463 |
for(var i=0; i<this.colCount; i++){
|
|
|
464 |
this.contentNodes[i].appendChild(this.pageNodes[i][inPageIndex]);
|
|
|
465 |
}
|
|
|
466 |
},
|
|
|
467 |
destroyPage: function(inPageIndex){
|
|
|
468 |
for(var i=0; i<this.colCount; i++){
|
|
|
469 |
dojox.grid.removeNode(this.invalidatePageNode(inPageIndex, this.pageNodes[i]));
|
|
|
470 |
}
|
|
|
471 |
},
|
|
|
472 |
// rendering implementation
|
|
|
473 |
renderPage: function(inPageIndex){
|
|
|
474 |
var nodes = [];
|
|
|
475 |
for(var i=0; i<this.colCount; i++){
|
|
|
476 |
nodes[i] = this.pageNodes[i][inPageIndex];
|
|
|
477 |
}
|
|
|
478 |
//this.renderRows(inPageIndex*this.rowsPerPage, this.rowsPerPage, nodes);
|
|
|
479 |
for(var i=0, j=inPageIndex*this.rowsPerPage; (i<this.rowsPerPage)&&(j<this.rowCount); i++, j++){
|
|
|
480 |
this.renderRow(j, nodes);
|
|
|
481 |
}
|
|
|
482 |
}
|
|
|
483 |
});
|
|
|
484 |
|
|
|
485 |
}
|