Re: Trapping the Option or Command keys
On Tue, Jul 28, 2009 at 10:08 PM, Bill Ziegler wrote: > Thanks to all for your advice. > I was going to check the state of the keys with an On-Idle script but will > try Sarah's suggestion instead. Don't use idle! It was OK in HyperCard's day, but with modern multi--tasking, an app with an idle loop will tie up your processor and all the other apps will hate it. Cheers, Sarah ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Trapping the Option or Command keys
Thanks to all for your advice. I was going to check the state of the keys with an On-Idle script but will try Sarah's suggestion instead. Thanks again BIll ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Trapping the Option or Command keys
Sarah Reichelt-2 wrote: > > On Tue, Jul 28, 2009 at 8:52 AM, wrote: >> Sarah: >> >> Just curious. Do you use "command" instead of (good ol') "on"? >> > > "command" was introduced in 3.? (3.5 I think) and I am gradually > training myself to use it. > The idea is that system messages still use "on", so you have "on > mouseUp", "on preOpenStack" etc. > But your own handlers use "command" instead of "on" to make it clearer > what's what. > "function" remains unchanged. > > However it's just a matter of style, I don't think either way is > inherently more correct and as far as I know, RunRev is not going to > make either one compulsory any time soon. > > Cheers, > Sarah > "command" has been around since before I started with Rev (2.7) - in the dictionary it says it was introduced in version 1.0! When I first started I defined every "command handler" with "command" as I couldn't clearly see what was meant by "on" but as I got exposed to the language I got used to "on" and adopted it (as well as "command" - see below). I think one of the main significant things is that you can define a "private command " but (from the docs) "Note: Although it is also possible to use "on" when declaring a private handler this is not recommended as it implies that the handler is a message sent when some event occurs. As private handlers are not passed through the message path, this is incorrect and can make the code harder to understand. Please see the on control structure entry for more details." It is really a matter of style, as Sarah says. I have sort of got a hazy policy of using "on" for handlers where I'm expecting a message to be passed up the path and handled "on" an event, and command (or private command) for handlers which are more just modular procedures (eg setup defaults) and/or like a function that doesn't return a value. I certainly don't get overly picky about the choice. -- View this message in context: http://www.nabble.com/Trapping-the-Option-or-Command-keys-tp24685348p24696836.html Sent from the Revolution - User mailing list archive at Nabble.com. ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Trapping the Option or Command keys
On Tue, Jul 28, 2009 at 8:52 AM, wrote: > Sarah: > > Just curious. Do you use "command" instead of (good ol') "on"? > "command" was introduced in 3.? (3.5 I think) and I am gradually training myself to use it. The idea is that system messages still use "on", so you have "on mouseUp", "on preOpenStack" etc. But your own handlers use "command" instead of "on" to make it clearer what's what. "function" remains unchanged. However it's just a matter of style, I don't think either way is inherently more correct and as far as I know, RunRev is not going to make either one compulsory any time soon. Cheers, Sarah ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Trapping the Option or Command keys
Sarah: Just curious. Do you use "command" instead of (good ol') "on"? Craig Newman ** A Good Credit Score is 700 or Above. See yours in just 2 easy steps! (http://pr.atwola.com/promoclk/100126575x1221823322x1201398723/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072&; hmpgID=115&bcd=JulystepsfooterNO115) ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Trapping the Option or Command keys
> I'm re-writing a hypercard stack in which buttons performed different > functions if the OptionKey or CommandKey were down. I need the title and > icon to change on all the buttons when either modifier key is down. Looking > back in the archives it seems like it was a problem only on Macs. Is there a > command now that will let me do this? The simplified interface I'm trying to > re-create will allow a button that is bordering a text field to either read > the contents of bordering text field with text-to-speech, record the > student's voice or play back the recorded voice. As other's have noted, on a Mac, there is no way to detect the modifier keys being pushed until another key is pushed too. When I have needed to do this, I set up a polling loop that checks the state of the modifiers regularly and alters the buttons accordingly e.g. command checkModKeys if the commandkey is down then set the label of btn "Action" to "Play" else if the optionkey is down then set the label of btn "Action" to "Record" else set the label of btn "Action" to "Speak" end if if the pendingmessages contains "checkModkey" is false then send "checkModKeys" to me in 20 ticks end if end checkModKeys All you have to remember then is to send the first checkModKeys when the card/stack opens and to stop the pending messages when it closes. I have found that this works well without placing much load on the processing. Cheers, Sarah ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Re: Trapping the Option or Command keys
Richmond Mathewson wrote:
2. The only 'problem' as far as I recall is that on a Mac the COMMAND key
(with a stylised apple on it) does the work of the CONTROL key in
Windows.
Actually there's a bigger problem. Neither Mac OS nor Mac OS X send any
keydown information about the Command or Control keys until a second
letter is typed (same for Shift and Option too.) Rev can't generate
keydown or rawkeydown messages on those because the OS doesn't notify
the engine anything has happened.
The only way to see if those keys are being depressed on a Mac is to
pair it with another system message, such as mouseEnter. Once you get a
system message triggered, you can check the state of the key inside that
handler ("if the commandkey is down...", etc.) I suppose one could use a
mousemove handler to check the state. That would fire repeatedly, which
may slow things down a bit, but probably not too much.
--
Jacqueline Landman Gay | jac...@hyperactivesw.com
HyperActive Software | http://www.hyperactivesw.com
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Re: Trapping the Option or Command keys
Bill Ziegler wrote: I'm re-writing a hypercard stack in which buttons performed different functions if the OptionKey or CommandKey were down. I need the title and icon to change on all the buttons when either modifier key is down. Looking back in the archives it seems like it was a problem only on Macs. Is there a command now that will let me do this? The simplified interface I'm trying to re-create will allow a button that is bordering a text field to either read the contents of bordering text field with text-to-speech, record the student's voice or play back the recorded voice. Thanks, Bill Ziegler ___ 1. Download my "KeyDowner" stack: http://mathewson.110mb.com/FILEZ/KEYDOWNER.rev.zip play around with it on Mac and Win. 2. The only 'problem' as far as I recall is that on a Mac the COMMAND key (with a stylised apple on it) does the work of the CONTROL key in Windows. So DON'T have settings for both COMMAND and CONTROL keys. ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
Trapping the Option or Command keys
I'm re-writing a hypercard stack in which buttons performed different functions if the OptionKey or CommandKey were down. I need the title and icon to change on all the buttons when either modifier key is down. Looking back in the archives it seems like it was a problem only on Macs. Is there a command now that will let me do this? The simplified interface I'm trying to re-create will allow a button that is bordering a text field to either read the contents of bordering text field with text-to-speech, record the student's voice or play back the recorded voice. Thanks, Bill Ziegler ___ use-revolution mailing list use-revolution@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
