Change
var sprite:Sprite = new Sprite();
to
var uiComponent:UIComponent = new UIComponent();
Flex is heavily biased towards UIComponents: they support instantiation
from MXML descriptors, invalidation, measurement, layout, focus
management, drag management, etc., etc.
Sprite supports none of these; it is a low-level Flash class on which we
build UIComponent. Sprites are light-weight, but that's because they
lack most of the capabilities that Flex is designed to offer.
By the way, is there some reason why you're creating a Shape inside to
draw on? You could just draw on the graphics of the Sprite or
UIComponent, and that would be more efficient because it wouldn't
involve creating an additional DisplayObject.
- Gordon
-----Original Message-----
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of sufibaba
Sent: Thursday, March 02, 2006 3:26 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: visual children must implement
mx.core.IUIComponent
Thanks Gordon,
That worked. One other question regarding Sprite Drag and Drop.
Situation: Have a box drawn by the Shape Class which is in a Sprite.
I have the following code:
-------- Draw Rectangle ------------------------------------------
private function draw (name:String) {
if (w > 0 && h > 0) {
var sprite:Sprite = new Sprite();
sprite.name = name;
trace("name= " + name);
addChild(sprite);
var child:Shape = new Shape();
child.graphics.beginFill(0xffffff);
child.graphics.lineStyle(.5, 0x000000);
child.graphics.drawRect(0, 0, w, h);
child.graphics.endFill();
sprite.addChild(child);
sprite.addEventListener(MouseEvent.MOUSE_DOWN, dragObject);
}
}
----------- dragObject -----------------------------------------------
private function dragObject(event:MouseEvent)
{
if (event.target.name == "obj"){
var
dragInitiator:UIComponent=UIComponent(event.currentTarget);
var ds:DragSource = new DragSource();
ds.addData("name","format");
var canvasProxy:Sprite = new Sprite();
canvasProxy.width=30;
canvasProxy.height=30;
DragManager.doDrag(dragInitiator, ds, event);
}
}
----------------------------------------------------------------
When I try to drag this object, I get the following Error:
Type Coercion failed: cannot convert flash.display::[EMAIL PROTECTED] to
mx.core.UIComponent
If I don't cast the sprite to the UIComponent, I still get the same
error. It seems that the DragManager likes UIComponent types.
What would be a solution do you think.
Cheers,
Tim
--- In flexcoders@yahoogroups.com, "Gordon Smith" <[EMAIL PROTECTED]> wrote:
>
> Make ImageViewer extend UIComponent instead of Sprite. In order to do
> stuff like automatic layout, Flex containers expect their content
> children to be UIComponents.
>
> - Gordon
>
>
> -----Original Message-----
> From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED]
On
> Behalf Of sufibaba
> Sent: Thursday, March 02, 2006 11:11 AM
> To: flexcoders@yahoogroups.com
> Subject: [flexcoders] visual children must implement
> mx.core.IUIComponent
>
> Hi All,
>
> I have the following:
>
> 1. ImageViewer.as
> 2. main.xml
>
> in ImageViewer.as, I have this class definition:
>
> public class ImageViewer extends Sprite {
> public funtion ImageViewer(){
> // code
> }
> // other functions and code
> }
>
>
> in main.xml, I am calling: <ImageViewer/>
>
> The error I am getting is:
> ---------------------------------------------------------------------
> component declaration are now allowed in here.(Note: visual children
> must implement mx.core.IUIComponent)
> ---------------------------------------------------------------------
> Does anone know what the problem might be.
>
> Any help is appreciated,
>
> Cheers,
>
> Tim
>
>
>
>
>
>
> --
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