[UI] A small change... for a start

[Igor Stasenko]

Another, maybe more elegant way is to add
a pattern like:

canvas withFillStyle: aStyle do:  aBlock.

and inside a block use calls like:
canvas fillRect: aRect.
canvas fillPolygon: aPoly
etc

On 22/03/2008, Igor Stasenko <siguctua at gmail.com> wrote:
> On 21/03/2008, Gary Chambers <gazzaguru2 at btinternet.com> wrote:
>
> > P.S. Just rectangular fills as a proof of concept for the moment.
>  >
>  >
>  >  > -----Original Message-----
>  >  > From: ui-bounces at lists.squeakfoundation.org
>  >
>  > > [mailto:ui-bounces at lists.squeakfoundation.org]On Behalf Of Gary Chambers
>  >  > Sent: 21 March 2008 5:59 PM
>  >  > To: Squeak's User Interface
>  >
>  > > Subject: RE: [UI] A small change... for a start
>  >  >
>  >  >
>  >  > Pinesoft-Widgets-gvc.302 on SqueakMap. Nebraska not included in
>  >  > changes (may do a separate package for that if there is interest).
>  >  >
>  >  > Added CompositeFillStyle. Canvas double-dispatches to the
>  >  > fillstyle/color/infiniteForm.
>  >  > Should allow more complex fills through subclassing(like pieced
>  >  > together from forms for a button, top-left image, top image etc.).
>  >  >
>  >  > Have fun!
>  >  >
>
>
> It looks double-dispatch needed from a BaloonEngine, not from Canvas.
>  A fillStyle needs method #registerFillWith: engine.
>
>  So, it will dispatch back to BalloonEngine with messages like:
>
>  ^ engine registerSolidFill: self.  "For single color fill"
>
>  ^ engine registerGradientFill: self "For gradient fill"
>
>  ^ engine registerBitmapFill: self "For bitmap fill"
>
>  And BaloonEngine>>registerFill: aFill should look like:
>  ^ aFill registerFillWith: self.
>
>  Otherwise we need to extend canvas protocol with methods:
>
>  #fillRectangle:color:
>  #fillRectangle:gradient:
>  #fillRectangle:bitmap:
>
>  I don't like that there is need in additional checking for fill type
>  later, after canvas receives
>  #fillRectangle:basicFillStyle:
>  i think it would be better to be precise after dispatch, what basic
>  fill type should be used.
>
>  >  > Gary
>
> >  >
>  --
>  Best regards,
>  Igor Stasenko AKA sig.
>


-- 
Best regards,
Igor Stasenko AKA sig.