RE: [flexcoders] DataGrid itemRenderer Woes

[Alex Harui]

Are you changing the visibility of the entire renderer or just a checkbox 
inside it?  Renderers on the recycle list get visible=false and set back to 
true when used again.  If you  completely hide a renderer, I'm not sure what 
would happen.

Other than that, I would find a way to introspect the renderers and see if they 
did compute visible correctly for their data.  It seems odd that your lookup of 
data.val is based on a column.

From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Simon 
Bailey
Sent: Sunday, November 23, 2008 11:24 AM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] DataGrid itemRenderer Woes


Ok I have stopped all the errors and essentially integrated your (Alex's) logic 
into my application after some serious hair pulling.

The responsibility lies now with the method below for showing or hiding the 
check box:

override protected function commitProperties():void
{
            super.commitProperties();
            var row:int = listData.rowIndex+1;
            visible = false;
            for( var i:int = 0; i < data.ff.length; i++ )
            {
                        if( data.val[listData.columnIndex-1] != undefined && 
data.val[listData.columnIndex-1].option[i] == row )
                        {
visible = true;
                        }
            }
            if (owner is ListBase)
                        selected = ListBase(owner).isItemSelected(data);
}

And dammit if its still doing exactly the same as before?!?

On 23 Nov 2008, at 04:48, Alex Harui wrote:



Read the item renderers section on my blog (blogs.adobe.com/aharui).  Start 
with the oldest posting.

From: < /span>flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of 
Simon Bailey
Sent: Saturday, November 22, 2008 2:37 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] DataGrid itemRenderer Woes


Hi,

I have seen through google that this has been an issue but
implementing various solutions still l! eaves my existing problem.

Essentially I have a DataGrid with a custom itemRenderer displaying
CheckBoxes.
Within the renderer I am running a comparison on a value within the
renderers data i.e. data.my_val and the current grid row and column
values.
Depending on whether the data value equals a specific row I show or
hide the check box.
I achieve this by running the comparison logic with the overridden
updateDisplayList method below which works fine until scrolled.

override protected function updateDisplayList( unscaledWidth:Number,
unscaledHeight:Number ):void
{
super.updateDisplayList( unscaledWidth, unscaledHeight );
var row:int = listData.rowIndex+1;

for( var! i:int = 0; i < data.ff.length; i++ )
{
if( data.val[listData.columnIndex-1] != undefined &&
data.val[listData.columnIndex-1].option[i] == row )
{
btn.visible = true;
}
}
}

The issue is on scroll all of the check boxes are displayed/hidden
incorrectly and the whole grid messes right up!

Any ideas pls would be appreciated.

Si