I have 2 questions about the code below that I'm using as an itemRenderer for a
DataGridColumn in a datagrid. First, is it possible to write an event handler
in my main mxml file that will allow me to respond to a mouse click when the
user clicks on the graphic in the DataGridColumn? When I click on the graphic
in the DataGridColumn, I'd like to modify the graphic (as if it were responding
to a button click).

Second, I'm trying to extend the class to something more sophisticated than a
Canvas (I left the code for a Sprite in the file to illustrate what I'm trying
to achieve), but I get error messages when I try a Sprite or UIContainer for my
class extension and then use that as my itemRenderer. How can I use a class
extension that is more sophisticated than a Canvas that will allow me to make
something interactive that can be used as an itemRenderer.?

<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="50" >
<mx:Script>
<![CDATA[
import flash.display.Sprite;
override protected function updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void{
super.updateDisplayList(unscaledWidth, unscaledHeight);
var circle:Sprite = new Sprite();
circle.graphics.beginFill(0xff0000);
circle.graphics.drawCircle(10, 10, 6);
circle.graphics.endFill();
//addChild(circle);

graphics.beginFill(0xff0000);
graphics.drawCircle(10, 10, 6);
graphics.endFill();

}
]]>
</mx:Script>
</mx:Canvas>

You can dispatch a "bubbling" event. Any object in the ancestor chain can
listen for it, including Application.

"more sophisticated than a Canvas " Canvas is a layout container. It does
things like calculate scrollbars and sizing children. Is that the
functionality you need?

If not, extend UIComponent. It can parent your sprite, or whatever.

Tracy

You can dispatch a "bubbling" event. Any object in the ancestor chain can
listen for it, including Application.

"more sophisticated than a Canvas " Canvas is a layout container. It does
things like calculate scrollbars and sizing children. Is that the
functionality you need?

If not, extend UIComponent. It can parent your sprite, or whatever.

Tracy

If I use a UIComponent I get the following error with the code below (which is
just a change from a Canvas to a UIComponent):
TypeError: Error #1034: Type Coercion failed: cannot convert
components::AddButton@565a331 to mx.controls.listClasses.IListItemRenderer.
at
mx.controls.dataGridClasses:ataGridBase/createCo lumnItemRenderer()[E:\dev\3.0.
x\frameworks\projects\framework\src\mx\controls\da taGridClasses\DataGridBase.as:
1415]

<?xml version="1.0" encoding="utf-8"?>
<mx:UIComponent xmlns:mx="http://www.adobe.com/2006/mxml" >
<mx:Script>
<![CDATA[
override protected function updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void{
super.updateDisplayList(unscaledWidth, unscaledHeight);
var myColor:uint=uint(0x555500);
graphics.beginFill(myColor);
graphics.drawRoundRect(0, 5, 30, 12, 3);

graphics.endFill();
}
]]>
</mx:Script>
</mx:UIComponent>

You can dispatch a "bubbling" event. Any object in the ancestor chain can
listen for it, including Application.

"more sophisticated than a Canvas " Canvas is a layout container. It does
things like calculate scrollbars and sizing children. Is that the
functionality you need?

If not, extend UIComponent. It can parent your sprite, or whatever.

Tracy

If I use a UIComponent I get the following error with the code below (which is
just a change from a Canvas to a UIComponent):
TypeError: Error #1034: Type Coercion failed: cannot convert
components::AddButton@565a331 to mx.controls.listClasses.IListItemRenderer.
at
mx.controls.dataGridClasses:ataGridBase/createCo lumnItemRenderer()[E:\dev\3.0.
x\frameworks\projects\framework\src\mx\controls\da taGridClasses\DataGridBase.as:
1415]

<?xml version="1.0" encoding="utf-8"?>
<mx:UIComponent xmlns:mx="http://www.adobe.com/2006/mxml" >
<mx:Script>
<![CDATA[
override protected function updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void{
super.updateDisplayList(unscaledWidth, unscaledHeight);
var myColor:uint=uint(0x555500);
graphics.beginFill(myColor);
graphics.drawRoundRect(0, 5, 30, 12, 3);

graphics.endFill();
}
]]>
</mx:Script>
</mx:UIComponent>

If I use a UIComponent I get the following error with the code below (which is
just a change from a Canvas to a UIComponent):
TypeError: Error #1034: Type Coercion failed: cannot convert
components::AddButton@565a331 to mx.controls.listClasses.IListItemRenderer.
at
mx.controls.dataGridClasses:ataGridBase/createCo lumnItemRenderer()[E:\dev\3.0.
x\frameworks\projects\framework\src\mx\controls\da taGridClasses\DataGridBase.as:
1415]

<?xml version="1.0" encoding="utf-8"?>
<mx:UIComponent xmlns:mx="http://www.adobe.com/2006/mxml" >
<mx:Script>
<![CDATA[
override protected function updateDisplayList(unscaledWidth:Number,
unscaledHeight:Number):void{
super.updateDisplayList(unscaledWidth, unscaledHeight);
var myColor:uint=uint(0x555500);
graphics.beginFill(myColor);
graphics.drawRoundRect(0, 5, 30, 12, 3);

graphics.endFill();
}
]]>
</mx:Script>
</mx:UIComponent>