rap@dana.UUCP (Rob Peck) (12/23/87)
In article <685@ur-tut.UUCP>, dpvc@ur-tut.UUCP (Davide P. Cervone) writes: > In article <1213@sugar.UUCP> peter@sugar.UUCP (Peter da Silva) writes: > >In article <209@dalcsug.UUCP>, peter@dalcsug.UUCP (Peter Philip) writes: > >> Can anyone tell me where I could find an example of detecting which keys > >> are being held down? ... > > One caution about using this method in a multi-window, multi-tasking > environment: you may miss some key presses or key-up events. For instance, Shortly after leaving Amiga, I had looked into porting THUNDER! by Batteries Included to the Amiga. For those of you who are not familiar with it, THUNDER is a workalike to Borland's Lightning!, which is a keystroke by keystroke spelling-error-detector. After thinking about it for a while, I found it difficult to resolve what to do if the user switched from one active window to another, perhaps in the middle of a word (or even, as has been suggested here about key-downs, in the middle of a keystroke). I had written an input handler to intercept the keyboard so that THUNDER could watch everything that crossed the keyboard that way. But if the input was being directed to several different windows, it would be difficult to decide when to beep so to speak. It would seem that not only would I have had to spell check on the fly for each word, but also check as each character was typed to see if it was still going to the same window as before, and continue from there. Aha, another alternative perhaps, rewrite all of the source code to be fully reentrant, and as a library. Limit the availability of the product to things that could be started from the CLI so that the CLI itself could be affected, naah, that wouldnt work, most programs open their own windows anyway and get input who knows how. Anyone who has "thought this out" already for a multitasking multiwindow environment, I'd be interested in hearing what you believe to be the real solution. I am not about to propose to EA (BI's new owners) to do the port (got plenty more to do than that), but the topic itself still interests me. Rob Peck ...ihnp4!hplabs!dana!rap
haitex@pnet01.cts.com (Wade Bickel) (12/25/87)
Hi Rob,
I think I have kind of run into another aspect of the same
problem. If I understand you correctly, the problem is that
there is no way to specify code to tidy up an active task about
to go inactive (ie: switching from one window to another).
My problem is not related to intuition, rather, I would like to
disable an interrupt server when my task does not have the console.
Perhaps I have missed the solution to this problem. I have looked
through the documentation some, and have concluded that this was
left open by C=.
If this is so, then what it seems to me is needed is a pointer,
within the task's node structure, to a programmers routine which would
do a bit of clean up. Perhaps there is a better way, but I think
this would work. In your case, I would assume that on a task
switch you could do some pointer manips in "THUNDER" to fix your
problem.
Of course, this does require a pretty heavy mod to the OS so???
Good Luck and Merry Christmas,
[PS: would you please send me an E/mail response so I can send
you private mail. I tried to send this via E/mail but
it was returned.]
Wade.
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