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Re: Widgets: group leader and procedures [message #37520 is a reply to message #37519]

Tue, 06 January 2004 19:56

Jeff Guerber
Messages: 41
Registered: July 2000

Member

On Sun, 4 Jan 2004, Robert Moss wrote:

> A bit of unsolicited advice: you had the following:
>
> state={ bunch of stuff}
> pstate = Ptr_new(state, /no_copy)
> widget_control, tlb, set_uvalue = pstate
>
> I would do this instead:
>
> state = {bunch of stuff}
> widget_control, tlb, set_uvalue = state, /no_copy
>
> There is no real need to stuff your entire widget state into a pointer.

I disagree: If you use a pointer for the widget state, you can change
its contents and not have to worry about stuffing it back into the uvalue
before you exit the event handler. Plus you won't be constantly making
copies of everything in your state structure, which can be an advantage if
it's large. Just remember to have the TLB's cleanup routine free pstate
(I call it statep, myself). After I started writing widgets, I very
quickly switched over to state pointers (until I discovered object
widgets, that is!).

Jeff Guerber

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[Message index]

		Re: Widgets: group leader and procedures By: David Fanning on Tue, 06 January 2004 20:20
		Re: Widgets: group leader and procedures By: Jeff Guerber on Tue, 06 January 2004 19:56
		Re: Widgets: group leader and procedures By: David Fanning on Sun, 04 January 2004 07:26
		Re: Widgets: group leader and procedures By: Robert Moss on Sun, 04 January 2004 04:45

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