[flexcoders] Re: Getting a DataGrid item renderer instance

Mon, 19 Jun 2006 18:26:40 -0700

Per Jeremy's suggestion, this will work in your components.imgReset itemRenderer component.

-TH

<mx:Script>
  <![CDATA[
  
   import mx.events.DataGridEvent;
   
   public function init():void   // creationComplete of the itemRenderer
   {
            parentDocument.myGrid.addEventListener(DataGridEvent.ITEM_EDIT_BEGIN, showResetState); 
            parentDocument.myGrid.addEventListener(DataGridEvent.ITEM_EDIT_END, showDefaultState);
    }
   
    public function showResetState(event:DataGridEvent):void
    {
            if (this.data == event.itemRenderer.data)
            {
                 currentState = 'showReset';  
            }  
     } 

    public function showDefaultState(event:DataGridEvent):void
    {
            currentState = '';   
     } 

]]>
</mx:Script>

--- In flexcoders@yahoogroups.com, "Bruce Denham" <[EMAIL PROTECTED]> wrote:
>
> Thanks, Tim and Tracy. I've started to explore/experiment more based
> on your feedback. I'll play with it more tonight and let you know
> what I come up with. Thanks, again!
>
> Bruce
>
> --- In flexcoders@yahoogroups.com, "Tim Hoff" TimHoff@ wrote:
> >
> >
> > Hi Bruce,
> >
> > I've been trying to figure this one out. As Tracy suggests, you
> could
> > put something like this in the itemRenderer component? I'm not
> sure,
> > however, how to associate the itemEditorInstance with the
> itemRenderer
> > instance. This might get you a little closer.
> >
> > -TH
> >
> > <mx:Script>
> > <![CDATA[
> >
> > import mx.core.Application;
> > import mx.events.DataGridEvent;
> >
> > public function init():void // creationComplete of the
> itemRenderer
> > {
> >
> > Application.application.myGrid.addEventListener
> (DataGridEvent.ITEM_EDIT_\
> > BEGIN, showResetState);
> >
> > Application.application.myGrid.addEventListener
> (DataGridEvent.ITEM_EDIT_\
> > END, showDefaultState);
> > }
> >
> > public function showResetState(event:DataGridEvent):void
> > {
> > // not sure exactly how, but you probably have to
> check here
> > to see if the itemEditorInstance relates to this
> > // itemRenderer instance. Something like if
> (this =
> > event.itemRenderer) {} ???
> > currentState = 'showReset';
> > }
> >
> > public function showDefaultState(event:DataGridEvent):void
> > {
> > currentState = '';
> > }
> >
> > ]]>
> > </mx:Script>
> >
> > --- In flexcoders@yahoogroups.com, "Tracy Spratt" <tspratt@> wrote:
> > >
> > > I think you need to do this via the underlying dataProvider,
> instead
> > of
> > > trying to directly manipulate rendered controls.
> > >
> > >
> > >
> > > On the edit event of the text control, set a property in the
> > > corresponding dataProvider item. Have the item renderer respond
> to
> > that
> > > value change by changing its state.
> > >
> > >
> > >
> > > Tracy
> > >
> > >
> > >
> > > ________________________________
> > >
> > > From: flexcoders@yahoogroups.com
> [mailto:[EMAIL PROTECTED]
> > On
> > > Behalf Of flex8it
> > > Sent: Monday, June 19, 2006 1:24 PM
> > > To: flexcoders@yahoogroups.com
> > > Subject: [flexcoders] Re: Getting a DataGrid item renderer
> instance
> > >
> > >
> > >
> > > More specifically, here's what I'm trying to change the
> viewState in
> > > my itemRenderer when the DataGrid's textfield is edited. But in
> > > order to do that, I need to somehow get an instance reference to
> my
> > > renderer component. And nothing I've done seems to work...
> > >
> > > <?xml version="1.0"?>
> > > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml
> > > <http://www.adobe.com/2006/mxml> "
> > > xmlns:comp="components.*"
> > > verticalAlign="top" horizontalAlign="center"
> > > layout="absolute">
> > >
> > > <mx:Script>
> > > <![CDATA[
> > > import components.imgReset;
> > > import mx.collections.ArrayCollection;
> > > import mx.events.DataGridEvent;
> > > import mx.controls.Alert;
> > >
> > > [Bindable]
> > > public var choices:ArrayCollection = choices = new
> > > ArrayCollection([
> > > {resetImage: "images/reset.png", fieldName: "Smalltown"},
> > > {resetImage: "images/reset.png", fieldName: "Bigtown"},
> > > ]);
> > >
> > > private function changeRendererState(event:DataGridEvent) : void
> > > {
> > > // I can get the rowIndex and columnIndex for the renderer,
> > > // but I don't exactly how to use them to get to the
> > > renderer object...
> > > Alert.show(event.rowIndex + ", " + (event.columnIndex - 1));
> > >
> > > // I just want to get the renderer instance...
> > > // First, there's a problem with my typecasting ??
> > > // Second, there's no such thing as a row property on
> > > // the DataGrid, but I really want there to be...
> > > var RendererInstance:imgReset = imgReset(this.myGrid.columns
> > > [event.columnIndex-1].row[event.rowIndex].itemRenderer);
> > >
> > > // Now I want to manipulate renderer instance
> > > properties/states...
> > > RendererInstance.currentState = 'showReset';
> > > }
> > > ]]>
> > > </mx:Script>
> > > <mx:DataGrid id="myGrid"
> > > editable="true"
> > > dataProvider="{choices}"
> > > itemEditEnd="changeRendererState(event)" >
> > > <mx:columns>
> > > <mx:DataGridColumn dataField="resetImage"
> > > headerRenderer="components.HeaderReset"
> > > itemRenderer="components.imgReset"/>
> > > <mx:DataGridColumn dataField="fieldName"
> > > editable="true" width="230"
> > > headerText="Field Name" />
> > > </mx:columns>
> > > </mx:DataGrid>
> > > </mx:Application>
> > >
> > > I'd sure appreciate some help on this conundrum.
> > >
> > > Many Thanks,
> > > Bruce
> > >
> > > --- In flexcoders@yahoogroups.com
> > <mailto:flexcoders%40yahoogroups.com>
> > > , "flex8it" bdenham@ wrote:
> > > >
> > > > I have simple datagrid with 2 columns and 2 rows like this:
> > > >
> > > > column 0 column 1
> > > > -------- ---------
> > > > image textfield
> > > > image textfield
> > > >
> > > > Column 0 contains my ImageRenderer component.
> > > > Column 1 contains the DataGrid's default item renderer and
> editor:
> > > > text, textfield.
> > > >
> > > > First Problem:
> > > > How do I identify/get a reference to a particular instance of
> my
> > > > ImageRenderer from, say, column[0], row[1]?
> > > >
> > > > Second (related) Problem:
> > > > How do I get the ImageRender instance that corresponds to the
> row
> > > of
> > > > the textfield that fires an event when edited?
> > > >
> > > > I've been wrestling with this problem for days now, and I just
> > > can't
> > > > seem to get a grasp on the communication/eventing
> infrastructure
> > > > that's probably necessary to pull this off. Please help.
> > > >
> > > > Thanks,
> > > > Bruce
> > > >
> > >
> >
>

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