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ChrisH
Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/19 19:21    #1
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I have a notification event set on MUIA_String_Acknowledge for my String gadgets, which means I get an event when the user presses Enter. The problem is that if the user just Tabs to the next String gadget, then I never get any event, and so the old String contents is still used.

So, is there any way to get an event on Tab? Preferably without a custom class.

Currently my best idea seems a bit kludgy & tricky: Get notified when MUIA_Window_ActiveObject changes, store the new object, then *somehow* check if the previous object was a string (any suggestions?), and if so then generate a fake MUIA_String_Acknowledge event for it.
Author of the PortablE programming language.
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tboeckel
Re: Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/19 21:50    #2
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There is no other way than subclassing. Just watch out for MUIM_GoInactive. This method will be called whenever the active object becomes inactive for whatever reason: TAB, mouse click, etc.
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ChrisH
Re: Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/19 22:56    #3
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@tboeckel Quote:
There is no other way than subclassing.

Not the answer I wanted to hear, but thanks for the confirmation.

But are you SURE my "best idea" isn't workable? It seems to me it would work if I can determine the parent object (class) of the active object. I presume that should be possible via some BOOPSI magic (if I had a clue).
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ChrisH
Re: Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/20 9:09    #4
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@tboeckel
Or if BOOPSI lacks class identification, then I can always use a hash-table to store all known string objects...
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Slash
Re: Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/20 9:19    #5
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Quote:

ChrisH wrote:
@tboeckel Quote:
There is no other way than subclassing.

Not the answer I wanted to hear, but thanks for the confirmation.


What's wrong with subclassing?
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ChrisH
Re: Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/20 9:41    #6
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@Slash Quote:
What's wrong with subclassing?

I've never done it with BOOPSI/MUI stuff, and I don't understand BOOPSI's object model. Possibly I can do it by copying & pasting an example (without really understanding), but they seems like a reciepy for disaster (e.g. my blind copying of DoPkt3() code to detect soft/hard links didn't work reliably).
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ChrisH
Re: Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/20 10:23    #7
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@tboeckel Quote:
Just watch out for MUIM_GoInactive

I decided to have a quick go, just to see how difficult or not this might be using a custom class... but I quickly ran into a problem:

MUIM_GoInactive does not exist in my public MUI headers. Since this solution is suppose to work on OS3.x (and clones), I guess this means your solution isn't workable

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ChrisH
Re: Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/20 18:30    #8
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I wrote Quote:
Currently my best idea seems a bit kludgy & tricky: Get notified when MUIA_Window_ActiveObject changes, store the new object, then *somehow* check if the previous object was a string (any suggestions?), and if so then generate a fake MUIA_String_Acknowledge event for it.

This is the solution I am now using. But rather than query BOOPSI for the object's type, I just store all known MUI String/Text/etc objects in a hash table. As this is all handled by PortablE's GUI generation system, it's no hassle.

But I'd still be interest to know (if possible) how to find the parent object (aka "class") of a BOOPSI object.
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broadblues
Re: Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/20 19:20    #9
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From intuition/class.h


/* convenient typecast */
#define _OBJ(o) ((struct _Object *)(o))

/* get "public" handle on baseclass instance from real beginning of obj data */
#define BASEOBJECT(_obj) ((Object *)(_OBJ(_obj)+1))

/* get back to object data struct from public handle */
#define _OBJECT(o) (_OBJ(o) - 1)

/* get class pointer from an object handle */
#define OCLASS(o) ((_OBJECT(o))->o_Class)
Blender For OS4.x : Blues : Walker Broad
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tboeckel
Re: Tabbing away from a MUI String gadget - any way to get an event?
Posted on: 2012/12/21 17:47    #10
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Quote:
MUIM_GoInactive does not exist in my public MUI headers. Since this solution is suppose to work on OS3.x (and clones), I guess this means your solution isn't workable


I may be missing in the by now quite old MUI 3.8 includes, but it is available in MUI 3.8 already and public since MUI 3.9. Furthermore there is the undocumented MUI features archive on Aminet since more than 14 years by now. This archives contains a header file with lots of useful definitions.
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