Kyle,
Sorry to break this to you, but any renderer based on Image is way too
heavy to have 600 visible items.
You should embed the checkbox image, then make a subclass of UIComponent
that always generates an instance of the images as a child, then makes
it invisible or visible based on the data.
Should look something like this:
public class WAGridBooleanRenderer extends UIComponent implements
IListItemRenderer, IDropInListItemRenderer
{
[Embed("checkimage.jpg")]
private static var CheckImage:Class;
private var _data:Object;
private var _listData:BaseListData;
private var child:DisplayObject;
private var text:String;
private var tip:ToolTip;
private var lastMeasuredHeight:Number = 0;
public function WAGridBooleanRenderer()
{
super();
}
override public function get data():Object
{
return _data;
}
override public function set data(value:Object):void
{
_data = value;
invalidateProperties();
}
override public function get listData():Object
{
return _listData;
}
override public function set listData(value:BaseListData):void
{
_listData = value;
}
override protected function createChildren():void
{
super.createChildren();
child = new CheckImage();
addChild(child);
}
override protected function commitProperties ():void
{
super.commitProperties();
var dataSelected:DataGridListData = listData as
DataGridListData;
var dg:APIDataGrid = listData.owner as
APIDataGrid;
var column:WAGridHeaderColumn =
dg.columns[dataSelected.columnIndex];
if(column != null && column.storedColumn != null
&& column.storedColumn.type != null) {
for each(var colValue:ColumnValue in
column.storedColumn.type.possibleValues) {
if(colValue.value ==
data[dataSelected.dataField]) {
child.visible = true;
} else {
child.visible = false;
}
}
}
}
}
/**
* center the contentHolder
*/
override protected function updateDisplayList(w:Number,
h:Number):void
{
super.updateDisplayList(w, h);
if (child)
{
child.x = (w - child.width) / 2;
child.y = (h - child.height) / 2;
}
}
________________________________
From: [email protected] [mailto:[EMAIL PROTECTED] On
Behalf Of Kyle Neath
Sent: Tuesday, September 11, 2007 8:42 AM
To: [email protected]
Subject: Re: [flexcoders] DataGrid: Horizontal Scrolling very slow
They're display only. Here's my renderer:
http://warpspire.com/misc/WAGridBooleanRenderer.as
<http://warpspire.com/misc/WAGridBooleanRenderer.as>
I also tried using an embedded image -- seemed like the performance
was pretty similar between the two methods.
Thanks!
Kyle
