//v.1.6 build 80603

/*
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: 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.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 (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){
                   		this._current_load=[j,(this._dpref?this._dpref:(max-j))]; //TODO - more intelectual prefetching
                   		this.load(this.xmlFileUrl+getUrlSymbol(this.xmlFileUrl)+"posStart="+j+"&count="+this._current_load[1], this._data_type);
                   		return;
                   }
                   	
                }
		}
}
dhtmlXGridObject.prototype._add_from_buffer=function(ind){
	    var row=this.render_row(ind);
	    if (row==-1) return -1;
	    if (row._attrs["selected"]){
			this.selectRow(row,false,true);
			delete row._attrs["selected"];
		}
	    if (!this._cssSP){
		    if (this._cssEven && ind%2 == 0 )
				row.className+=" "+this._cssEven;
			else if (this._cssUnEven && ind%2 == 1 )
				row.className+=" "+this._cssUnEven;
			} 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]));
	    			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;
}