HIViews and Quickdraw

[Eric VERGNAUD]

Hi,

In order to support brush metal, I am adapting my Carbon Quickdraw framework
to support compositing.

Everything works fine for standard controls. In order to handle custom
content, I have succesfully created a custom HIView, and added it to the
content view of the window.

The problem I have is when my custom control is called with
kEventControlDraw, I cannot get a quickdraw port.

I can get a valid CGContext using the following:

err = ::GetEventParameter
(inEvent,kEventParamCGContextRef,typeCGContextRef, 0,sizeof(gc),0,&gc);

But when I call

err = ::GetEventParameter
(inEvent,kEventParamGrafPort,typeGrafPtr,0,sizeof( port),0,&port);

I get a eventParameterNotFoundErr err.

Am I doing something wrong ?
Is this a known bug ?
Is there a workaround ?

I could not find any function to convert a CGContext to a grafport.

I don't want to use Quartz because the framework needs to run on MacOS 9.

AHWBA.

Eric

[Arne Scheffler]

Eric VERGNAUD wrote:

> Hi,
>
> In order to support brush metal, I am adapting my Carbon Quickdraw framework
> to support compositing.
>
> Everything works fine for standard controls. In order to handle custom
> content, I have succesfully created a custom HIView, and added it to the
> content view of the window.
>
> The problem I have is when my custom control is called with
> kEventControlDraw, I cannot get a quickdraw port.
>
> I can get a valid CGContext using the following:
>
> err = ::GetEventParameter
> (inEvent,kEventParamCGContextRef,typeCGContextRef, 0,sizeof(gc),0,&gc);
>
> But when I call
>
> err = ::GetEventParameter
> (inEvent,kEventParamGrafPort,typeGrafPtr,0,sizeof( port),0,&port);
>
> I get a eventParameterNotFoundErr err.
>
> Am I doing something wrong ?
> Is this a known bug ?
> Is there a workaround ?
>

Just read the documentation :
from CarbonEvents.h :

kEventControlDraw
Required parameters:
--> kEventParamDirectObject typeControlRef

Optional parameters:
--> kEventParamGrafPort typeGrafPtr
(draw into the current port if kEventParamGrafPort
is not present)


arne