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dojox
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_Scroller.js

_Scroller.js 9.7 KB
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  1. /*
    2. 

  2. 	Copyright (c) 2004-2009, The Dojo Foundation All Rights Reserved.
    3. 

  3. 	Available via Academic Free License >= 2.1 OR the modified BSD license.
    4. 

  4. 	see: http://dojotoolkit.org/license for details
    5. 

  5. */
    6. 

  6. 

  7. 

  8. if(!dojo._hasResource["dojox.grid._Scroller"]){dojo._hasResource["dojox.grid._Scroller"]=true;dojo.provide("dojox.grid._Scroller");(function(){var _1=function(_2){var i=0,n,p=_2.parentNode;while((n=p.childNodes[i++])){if(n==_2){return i-1;}}return -1;};var _3=function(_4){if(!_4){return;}var _5=function(_6){return _6.domNode&&dojo.isDescendant(_6.domNode,_4,true);};var ws=dijit.registry.filter(_5);for(var i=0,w;(w=ws[i]);i++){w.destroy();}delete ws;};var _7=function(_8){var _9=dojo.byId(_8);return (_9&&_9.tagName?_9.tagName.toLowerCase():"");};var _a=function(_b,_c){var _d=[];var i=0,n;while((n=_b.childNodes[i])){i++;if(_7(n)==_c){_d.push(n);}}return _d;};var _e=function(_f){return _a(_f,"div");};dojo.declare("dojox.grid._Scroller",null,{constructor:function(_10){this.setContentNodes(_10);this.pageHeights=[];this.pageNodes=[];this.stack=[];},rowCount:0,defaultRowHeight:32,keepRows:100,contentNode:null,scrollboxNode:null,defaultPageHeight:0,keepPages:10,pageCount:0,windowHeight:0,firstVisibleRow:0,lastVisibleRow:0,averageRowHeight:0,page:0,pageTop:0,init:function(_11,_12,_13){switch(arguments.length){case 3:this.rowsPerPage=_13;case 2:this.keepRows=_12;case 1:this.rowCount=_11;default:break;}this.defaultPageHeight=this.defaultRowHeight*this.rowsPerPage;this.pageCount=this._getPageCount(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");}},_getPageCount:function(_14,_15){return _14?(Math.ceil(_14/_15)||1):0;},destroy:function(){this.invalidateNodes();delete this.contentNodes;delete this.contentNode;delete this.scrollboxNode;},setKeepInfo:function(_16){this.keepRows=_16;this.keepPages=!this.keepRows?this.keepPages:Math.max(Math.ceil(this.keepRows/this.rowsPerPage),2);},setContentNodes:function(_17){this.contentNodes=_17;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]||[];},invalidate:function(){this._invalidating=true;this.invalidateNodes();this.pageHeights=[];this.height=(this.pageCount?(this.pageCount-1)*this.defaultPageHeight+this.calcLastPageHeight():0);this.resize();this._invalidating=false;},updateRowCount:function(_18){this.invalidateNodes();this.rowCount=_18;var _19=this.pageCount;if(_19===0){this.height=1;}this.pageCount=this._getPageCount(this.rowCount,this.rowsPerPage);if(this.pageCount<_19){for(var i=_19-1;i>=this.pageCount;i--){this.height-=this.getPageHeight(i);delete this.pageHeights[i];}}else{if(this.pageCount>_19){this.height+=this.defaultPageHeight*(this.pageCount-_19-1)+this.calcLastPageHeight();}}this.resize();},pageExists:function(_1a){return Boolean(this.getDefaultPageNode(_1a));},measurePage:function(_1b){if(this.grid.rowHeight){var _1c=this.grid.rowHeight+1;return ((_1b+1)*this.rowsPerPage>this.rowCount?this.rowCount-_1b*this.rowsPerPage:this.rowsPerPage)*_1c;}var n=this.getDefaultPageNode(_1b);return (n&&n.innerHTML)?n.offsetHeight:undefined;},positionPage:function(_1d,_1e){for(var i=0;i<this.colCount;i++){this.pageNodes[i][_1d].style.top=_1e+"px";}},repositionPages:function(_1f){var _20=this.getDefaultNodes();var _21=0;for(var i=0;i<this.stack.length;i++){_21=Math.max(this.stack[i],_21);}var n=_20[_1f];var y=(n?this.getPageNodePosition(n)+this.getPageHeight(_1f):0);for(var p=_1f+1;p<=_21;p++){n=_20[p];if(n){if(this.getPageNodePosition(n)==y){return;}this.positionPage(p,y);}y+=this.getPageHeight(p);}},installPage:function(_22){for(var i=0;i<this.colCount;i++){this.contentNodes[i].appendChild(this.pageNodes[i][_22]);}},preparePage:function(_23,_24){var p=(_24?this.popPage():null);for(var i=0;i<this.colCount;i++){var _25=this.pageNodes[i];var _26=(p===null?this.createPageNode():this.invalidatePageNode(p,_25));_26.pageIndex=_23;_25[_23]=_26;}},renderPage:function(_27){var _28=[];var i,j;for(i=0;i<this.colCount;i++){_28[i]=this.pageNodes[i][_27];}for(i=0,j=_27*this.rowsPerPage;(i<this.rowsPerPage)&&(j<this.rowCount);i++,j++){this.renderRow(j,_28);}},removePage:function(_29){for(var i=0,j=_29*this.rowsPerPage;i<this.rowsPerPage;i++,j++){this.removeRow(j);}},destroyPage:function(_2a){for(var i=0;i<this.colCount;i++){var n=this.invalidatePageNode(_2a,this.pageNodes[i]);if(n){dojo.destroy(n);}}},pacify:function(_2b){},pacifying:false,pacifyTicks:200,setPacifying:function(_2c){if(this.pacifying!=_2c){this.pacifying=_2c;this.pacify(this.pacifying);}},startPacify:function(){this.startPacifyTicks=new Date().getTime();},doPacify:function(){var _2d=(new Date().getTime()-this.startPacifyTicks)>this.pacifyTicks;this.setPacifying(true);this.startPacify();return _2d;},endPacify:function(){this.setPacifying(false);},resize:function(){if(this.scrollboxNode){this.windowHeight=this.scrollboxNode.clientHeight;}for(var i=0;i<this.colCount;i++){dojox.grid.util.setStyleHeightPx(this.contentNodes[i],Math.max(1,this.height));}var _2e=(!this._invalidating);if(!_2e){var ah=this.grid.attr("autoHeight");if(typeof ah=="number"&&ah<=Math.min(this.rowsPerPage,this.rowCount)){_2e=true;}}if(_2e){this.needPage(this.page,this.pageTop);}var _2f=(this.page<this.pageCount-1)?this.rowsPerPage:((this.rowCount%this.rowsPerPage)||this.rowsPerPage);var _30=this.getPageHeight(this.page);this.averageRowHeight=(_30>0&&_2f>0)?(_30/_2f):0;},calcLastPageHeight:function(){if(!this.pageCount){return 0;}var _31=this.pageCount-1;var _32=((this.rowCount%this.rowsPerPage)||(this.rowsPerPage))*this.defaultRowHeight;this.pageHeights[_31]=_32;return _32;},updateContentHeight:function(_33){this.height+=_33;this.resize();},updatePageHeight:function(_34,_35){if(this.pageExists(_34)){var oh=this.getPageHeight(_34);var h=(this.measurePage(_34));if(h===undefined){h=oh;}this.pageHeights[_34]=h;if(oh!=h){this.updateContentHeight(h-oh);var ah=this.grid.attr("autoHeight");if((typeof ah=="number"&&ah>this.rowCount)||(ah===true&&!_35)){this.grid.sizeChange();}else{this.repositionPages(_34);}}return h;}return 0;},rowHeightChanged:function(_36){this.updatePageHeight(Math.floor(_36/this.rowsPerPage),false);},invalidateNodes:function(){while(this.stack.length){this.destroyPage(this.popPage());}},createPageNode:function(){var p=document.createElement("div");dojo.attr(p,"role","presentation");p.style.position="absolute";p.style[dojo._isBodyLtr()?"left":"right"]="0";return p;},getPageHeight:function(_37){var ph=this.pageHeights[_37];return (ph!==undefined?ph:this.defaultPageHeight);},pushPage:function(_38){return this.stack.push(_38);},popPage:function(){return this.stack.shift();},findPage:function(_39){var i=0,h=0;for(var ph=0;i<this.pageCount;i++,h+=ph){ph=this.getPageHeight(i);if(h+ph>=_39){break;}}this.page=i;this.pageTop=h;},buildPage:function(_3a,_3b,_3c){this.preparePage(_3a,_3b);this.positionPage(_3a,_3c);this.installPage(_3a);this.renderPage(_3a);this.pushPage(_3a);},needPage:function(_3d,_3e){var h=this.getPageHeight(_3d),oh=h;if(!this.pageExists(_3d)){this.buildPage(_3d,this.keepPages&&(this.stack.length>=this.keepPages),_3e);h=this.updatePageHeight(_3d,true);}else{this.positionPage(_3d,_3e);}return h;},onscroll:function(){this.scroll(this.scrollboxNode.scrollTop);},scroll:function(_3f){this.grid.scrollTop=_3f;if(this.colCount){this.startPacify();this.findPage(_3f);var h=this.height;var b=this.getScrollBottom(_3f);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,_3f);this.lastVisibleRow=this.getLastVisibleRow(p-1,y,b);if(h!=this.height){this.repositionPages(p-1);}this.endPacify();}},getScrollBottom:function(_40){return (this.windowHeight>=0?_40+this.windowHeight:-1);},processNodeEvent:function(e,_41){var t=e.target;while(t&&(t!=_41)&&t.parentNode&&(t.parentNode.parentNode!=_41)){t=t.parentNode;}if(!t||!t.parentNode||(t.parentNode.parentNode!=_41)){return false;}var _42=t.parentNode;e.topRowIndex=_42.pageIndex*this.rowsPerPage;e.rowIndex=e.topRowIndex+_1(t);e.rowTarget=t;return true;},processEvent:function(e){return this.processNodeEvent(e,this.contentNode);},renderRow:function(_43,_44){},removeRow:function(_45){},getDefaultPageNode:function(_46){return this.getDefaultNodes()[_46];},positionPageNode:function(_47,_48){},getPageNodePosition:function(_49){return _49.offsetTop;},invalidatePageNode:function(_4a,_4b){var p=_4b[_4a];if(p){delete _4b[_4a];this.removePage(_4a,p);_3(p);p.innerHTML="";}return p;},getPageRow:function(_4c){return _4c*this.rowsPerPage;},getLastPageRow:function(_4d){return Math.min(this.rowCount,this.getPageRow(_4d+1))-1;},getFirstVisibleRow:function(_4e,_4f,_50){if(!this.pageExists(_4e)){return 0;}var row=this.getPageRow(_4e);var _51=this.getDefaultNodes();var _52=_e(_51[_4e]);for(var i=0,l=_52.length;i<l&&_4f<_50;i++,row++){_4f+=_52[i].offsetHeight;}return (row?row-1:row);},getLastVisibleRow:function(_53,_54,_55){if(!this.pageExists(_53)){return 0;}var _56=this.getDefaultNodes();var row=this.getLastPageRow(_53);var _57=_e(_56[_53]);for(var i=_57.length-1;i>=0&&_54>_55;i--,row--){_54-=_57[i].offsetHeight;}return row+1;},findTopRow:function(_58){var _59=this.getDefaultNodes();var _5a=_e(_59[this.page]);for(var i=0,l=_5a.length,t=this.pageTop,h;i<l;i++){h=_5a[i].offsetHeight;t+=h;if(t>=_58){this.offset=h-(t-_58);return i+this.page*this.rowsPerPage;}}return -1;},findScrollTop:function(_5b){var _5c=Math.floor(_5b/this.rowsPerPage);var t=0;var i,l;for(i=0;i<_5c;i++){t+=this.getPageHeight(i);}this.pageTop=t;this.needPage(_5c,this.pageTop);var _5d=this.getDefaultNodes();var _5e=_e(_5d[_5c]);var r=_5b-this.rowsPerPage*_5c;for(i=0,l=_5e.length;i<l&&i<r;i++){t+=_5e[i].offsetHeight;}return t;},dummy:0});})();}
    9.