//v.2.1 build 90226

/*
Copyright DHTMLX LTD. http://www.dhtmlx.com
To use this component please contact sales@dhtmlx.com to obtain license
*/
/**
*   @desc: enable smart rendering mode
*   @type: public
*   @param: mode - true|false - enable|disable mode
*   @param: buffer - has sense only in dynamic loading mode, count of rows requrested from server by single operation, optional
*   @topic: 0
*/
dhtmlXGridObject.prototype.enableSmartRendering=function(mode,buffer,reserved){
	if (arguments.length>2){
		if (buffer && !this.rowsBuffer[buffer-1]) this.rowsBuffer[buffer-1]=0;
		buffer=reserved;
	}
	this._srnd=convertStringToBoolean(mode);
	this._srdh=this._srdh||20;
	this._dpref=buffer||0;
	
};
/**
*   @desc: allows to pre-render rows during scrolling, make scrolling more smooth, but with small drop in overall perfomance
*   @type: public
*   @param: buffer - count of rows, which will be prerendered
*   @topic: 0
*/
dhtmlXGridObject.prototype.enablePreRendering=function(buffer){
	this._srnd_pr=parseInt(buffer||50);
};
/**
*   @desc: force grid in dyn. srnd mode fully load itself from server side
*   @type: public
*   @param: buffer - how much rows grid can request from server side in one operation
*   @topic: 0
*/
dhtmlXGridObject.prototype.forceFullLoading=function(buffer){
	buffer=buffer||50;
	for (var i=0; i<this.rowsBuffer.length; i++)
		if (!this.rowsBuffer[i]){
			if (this.callEvent("onDynXLS",[i,buffer])){
				var self=this;
				this.load(this.xmlFileUrl+getUrlSymbol(this.xmlFileUrl)+"posStart="+i+"&count="+buffer, function(){ window.setTimeout(function(){self.forceFullLoading(); },100); }, this._data_type);
			}
			return;
		}
};

/**
*   @desc: set height which will be used in smart rendering mode for row calculation, function need to be used if you use custom skin for grid which changes default row height
*   @type: public
   @param: {int} height - awaited height of row
*   @returns: void
*   @topic: 0
*/      
dhtmlXGridObject.prototype.setAwaitedRowHeight = function(height) {
   this._srdh=parseInt(height);
};

dhtmlXGridObject.prototype._get_view_size=function(){
	return Math.floor(parseInt(this.entBox.offsetHeight)/this._srdh)+2;
};
dhtmlXGridObject.prototype._add_filler=function(pos,len,fil){
	if (!len) return null;
	var id="__filler__";
	var row=this._prepareRow(id);
	row.firstChild.style.width="1px";
	for (var i=1; i<row.childNodes.length; i++)
	    row.childNodes[i].style.display='none';
 	row.firstChild.style.height=len*this._srdh+"px";
 	fil=fil||this.rowsCol[pos];
 	if (fil && fil.nextSibling) 
 		fil.parentNode.insertBefore(row,fil.nextSibling);
 	else
 		if (_isKHTML)
 			this.obj.appendChild(row);
 		else
 			this.obj.rows[0].parentNode.appendChild(row);
 		
 	return [pos,len,row];
};
dhtmlXGridObject.prototype._update_srnd_view=function(){
	    var min=Math.floor(this.objBox.scrollTop/this._srdh);
        var max=min+this._get_view_size();
        if (this.multiLine) {
        // Calculate the min, by Stephane Bernard
            var pxHeight = this.objBox.scrollTop;
            min = 0;
            while(pxHeight > 0) {
                pxHeight-=this.rowsCol[min]?this.rowsCol[min].offsetHeight:this._srdh;
                min++;
            }
            // Calculate the max
            max=min+this._get_view_size();
            if (min>0) min--;
        }        
        max+=(this._srnd_pr||0);//pre-rendering
        if (max>this.rowsBuffer.length) max=this.rowsBuffer.length;

        for (var j=min; j<max; j++){ 
            if (!this.rowsCol[j]){
				var res=this._add_from_buffer(j);
				if (res==-1){
					if (this.xmlFileUrl){
					this._current_load=[j,(this._dpref?this._dpref:(max-j))]; //TODO - more intelectual prefetching
						if (this.callEvent("onDynXLS",[j,this._current_load[1]]))
					this.load(this.xmlFileUrl+getUrlSymbol(this.xmlFileUrl)+"posStart="+j+"&count="+this._current_load[1], this._data_type);
					}
					return;
				} else {
	               	if (this._tgle){
	               		this._updateLine(this._h2.get[this.rowsBuffer[j].idd],this.rowsBuffer[j]);
	               		this._updateParentLine(this._h2.get[this.rowsBuffer[j].idd],this.rowsBuffer[j]);
	           		}
					if (j && j==(this._realfake?this._fake:this)["_r_select"]){
						this.selectCell(j, this.cell?this.cell._cellIndex:0, true);
					}
				}
            }
		}
}
dhtmlXGridObject.prototype._add_from_buffer=function(ind){
	    var row=this.render_row(ind);
	    if (row==-1) return -1;
	    if (row._attrs["selected"] || row._attrs["select"]){
			this.selectRow(row,false,true);
			row._attrs["selected"]=row._attrs["select"]=null;
		}
						
	    if (!this._cssSP){
		    if (this._cssEven && ind%2 == 0 )
				row.className=this._cssEven+((row.className.indexOf("rowselected") != -1)?" rowselected ":" ")+(row._css||"");
			else if (this._cssUnEven && ind%2 == 1 )
			    row.className=this._cssUnEven+((row.className.indexOf("rowselected") != -1)?" rowselected ":" ")+(row._css||"");				
			} else if (this._h2) {
				var x=this._h2.get[row.idd];
				row.className+=" "+((x.level%2)?(this._cssUnEven+" "+this._cssUnEven):(this._cssEven+" "+this._cssEven))+"_"+x.level+(this.rowsAr[x.id]._css||"");
			}

	    //now we need to get location of node
	    for (var i=0; i<this._fillers.length; i++){
	    	var f=this._fillers[i];
	    	if (f && f[0]<=ind && (f[0]+f[1])>ind ){
	    		//filler found
	    		var pos=ind-f[0];
	    		if (pos==0){
	    			//start
	    			this._insert_before(ind,row,f[2]);
	    			this._update_fillers(i,-1,1);
	    		} else if (pos == f[1]-1){
	    			this._insert_after(ind,row,f[2]);
	    			this._update_fillers(i,-1,0);
	    		} else {
	    			this._fillers.push(this._add_filler(ind+1,f[1]-pos-1,f[2],1));
	    			this._insert_after(ind,row,f[2]);
	    			this._update_fillers(i,-f[1]+pos,0);
	    		}
	    		return;
	    	}
	    }
}
dhtmlXGridObject.prototype._update_fillers=function(ind,right,left){
	var f=this._fillers[ind];
	f[1]=f[1]+right;
	f[0]=f[0]+left;
	if (!f[1]){
		f[2].parentNode.removeChild(f[2]);
		this._fillers.splice(ind,1);
	}
	else 
		f[2].firstChild.style.height=parseFloat(f[2].firstChild.style.height)+right*this._srdh+"px";	
}
dhtmlXGridObject.prototype._insert_before=function(ind,row,fil){
	fil.parentNode.insertBefore(row,fil);
	this.rowsCol[ind]=row;
}
dhtmlXGridObject.prototype._insert_after=function(ind,row,fil){
	if (fil.nextSibling)
		fil.parentNode.insertBefore(row,fil.nextSibling);
	else
		fil.parentNode.appendChild(row);
	this.rowsCol[ind]=row;
}