I attacked this problem by focusing on keeping all the check-boxes
correctly selected during a wild scroll up or down. Here's <a
href="http://home.comcast.net/~max.nachlinger/dgCheckboxScroll/";>my
solution</a>, I hope it helps.
--Max
--- In flexcoders@yahoogroups.com, Simon Bailey <[EMAIL PROTECTED]> wrote:
>
> Fair enough, thanks for the feedback :)
>
> On 24 Nov 2008, at 15:49, Alex Harui wrote:
>
> >
> > The code you posted just sets visible=true/false which would
likely
> > set the entire renderer to visible/invisible and not some checkbox
> > inside. If the code you showed is for a subclassed checkbox inside
> > the renderer, then I'd make sure the .data is passed from the
> > renderer to the subclassed checkbox.
> >
> >
> >
> > In cases like these, I usually extend DataGrid and add a function
> > that dumps out the state of the renderers and their data items.
> > Scroll until it goes bad, hit the button, call the function in the
> > DG and see what it thinks is going on.
> >
> >
> >
> > -Alex
> >
> >
> >
> > From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com
]
> > On Behalf Of Simon Bailey
> > Sent: Sunday, November 23, 2008 11:44 PM
> > To: flexcoders@yahoogroups.com
> > Subject: Re: [flexcoders] DataGrid itemRenderer Woes
> >
> >
> >
> > Just a checkbox inside of it in answer to your first question.
> >
> >
> >
> > The reason I am using a column to ascertain visibility of the
check
> > box is due to using a vo to populate the header renderer and I
need
> > to make a comparison between the grid renderer current item and it
> > corresponding column header vo.
> >
> >
> >
> > Cheers,
> >
> >
> >
> > Si
> >
> >
> >
> > On 24 Nov 2008, at 06:33, Alex Harui wrote:
> >
> >
> >
> >
> >
> >
> > 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:flexcoders@yahoogroups.com
]
> > 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:flexcoders@yahoogroups.com
> > ] 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
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
