Mail Archives: djgpp/2000/05/29/15:00:10
From: | "Michael Stewart" <mike AT reggin DOT freeserve DOT co DOT uk>
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Newsgroups: | comp.os.msdos.djgpp
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References: | <ulmY4.563$x8 DOT 4314 AT nsw DOT nnrp DOT telstra DOT net>
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Subject: | Re: dj callbacks
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Date: | Mon, 29 May 2000 19:51:33 +0100
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To: | djgpp AT delorie DOT com
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Paul Cechner <paul AT ibc DOT com DOT au DOT NOSPAM> wrote in message
news:ulmY4.563$x8 DOT 4314 AT nsw DOT nnrp DOT telstra DOT net...
> can you set up your own custom callbacks in dj?? and how???
Of course
> ie, can you (for instance) create a myObj::user_callback_handler() method
> which you initialise to be called when a certain trigger is thrown
elsewhere
> (ie, myBouncingObject::triggerThrower())? sort of reaction based
> programming....
Sure, see below.
> im not sure what terminology to use, so i hope you understand what im
> talking about.
I think you are refering to event driven programming.
> i want to use this to call a certain handler when some non-specific
trigger
> is thrown (ie, bringing up a menu when a any number of user actions is
> performed)
This is taken from Allegro
/* install_keyboard_hooks:
* You should only use this function if you *aren't* using the rest of the
* keyboard handler. It can be called in the place of install_keyboard(),
* and lets you provide callback routines to detect and read keypresses,
* which will be used by the main keypressed() and readkey() functions.
This
* can be useful if you want to use Allegro's GUI code with a custom
* keyboard handler, as it provides a way for the GUI to access keyboard
* input from your own code.
*/
void install_keyboard_hooks(int (*keypressed)(), int (*readkey)())
{
keypressed_hook = keypressed;
readkey_hook = readkey;
}
Mike
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