Sorry correction, 'owner' in the datagrid is the DataGridRow not the column!
> -----Original Message----- > From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On > Behalf Of Theodore E Patrick > Sent: Monday, July 11, 2005 9:10 AM > To: flexcoders@yahoogroups.com > Subject: RE: [flexcoders] Re: Extending DataGridColumn + emitting events = > java.lang.NullPointerException > > Use a cellrenderer, the cellRenderer API was designed to extends and > provide > custom inner layout of datagrid cells. > > There are some default objects that decorate each CellRenederer instance: > > var listOwner:MovieClip //the datagrid > var getCellIndex:Function > var getDataLabel:Function > var owner:MovieClip //the dataGridColumn instance > > These are actually present whether you use a customCellRenderer or not. So > in your case simply use these to listen/dispatch the events you need. Your > Cellrenderer can add events onto these objects or broadcast events out to > the DataGrid as things happen within the CellRenderer. > > For example say I have an inner checkbox within my CellRenderer. I would > add > a click event onto that control where it would do something like so. > > Note: 'com' is my cellRenderers inner component instance: > > function click(){ > > //obtain the index > > var index = getCellIndex() > > //obtain the columnName from the Datagrid > > var colName = listOwner.getColumnAt( index.columnIndex ).columnName > > //edit the data because the component data had changed > > listOwner.dataProvider.editField( index.itemIndex , colName , com.selected > ) > > //set the dataproviders seletedIndex > > listOwner.selectedIndex = index.itemIndex > > //trigger a 'celledit' event in the datagrid > > listOwner.dispatchEvent( { type:"cellEdit" , cell:this , column:colName, > value:com.selected } ) > > } > > Stump Flexcoders? Think again! :) > > Cheers, > > Ted ;) > > > > Well, I found you can simply pass a Function object to the custom > > DataGridCell and have the custom cell handle its own click method with > > that Function. The drawback is that the function must live in the > > same MXML file that the DataGridCell is declared in. I'd still much > > rather use Flex's own event handling mechanisms. Any other ideas? > > Have I stumped the flexcoders?! > > > > > -- > Flexcoders Mailing List > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com > Yahoo! Groups Links > > > > -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
