rubycocoa-talk

[Rubycocoa-talk] @selector thingamabob.

[Dave H. <gr...@gr...>]

I'm creating a handy way of doing alert sheets for a program, so that  
they'd work something like this:

class Main < OSX::NSObject

    ib_outlet :window,

	def applicationDidFinishLaunching(something)
		myAlert = AlertMessage.alloc.init.display(@window, 'Quit already?',  
"This program just launched! Do you want to quit  
already?","OK","Cancel")
		if myAlert then @window.close
	end
end

Assume that the window's connected to "window" in InterfaceBuilder, et  
cetera.

Unfortunately, there's one critical piece missing, and I'm mystified on  
how to get this part to work. The following code will run....

require 'osx/cocoa'

class AlertMessage < OSX::NSObject

	include OSX

	def display(theWindow, messageTitle, messageText, defaultOption,  
altOption)
		p "Alert: " + messageTitle
		theAlert = NSAlert.alloc.init
		theAlert.addButtonWithTitle(defaultOption)
		theAlert.addButtonWithTitle(altOption) if altOption
		theAlert.setMessageText(messageTitle)
		theAlert.setInformativeText(messageText)
		someAnswer =  
theAlert.beginSheetModalForWindow_modalDelegate_didEndSelector_contextIn 
fo(theWindow, self, 'alertDidEnd_returnCode_contextInfo', nil)
		p "Answer"
		p someAnswer
		return @theResponse
	end

	def alertDidEnd_returnCode_contextInfo(theAlert)
		return
	end
	
end



Unfortunately, I can't do anything but one-button messages, because I  
can't get the return code back from the NSAlert. The call to  
'beginSheetModalForWindow...' looks like this in Objective-C:

beginSheetModalForWindow:[someWindow window]
	modalDelegate:self
	didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:)
	contextInfo:nil

How exactly can I get a parameterized selector into this thing? In  
other words,  how do I do
	@selector(alertDidEnd:returnCode:contextInfo:)
in RubyCocoa?

Re: [Rubycocoa-talk] @selector thingamabob.

[Jonathan P. <jp...@dc...>]

On 20 Jan 2006, at 20:49, Dave Howell wrote:

> 	def alertDidEnd_returnCode_contextInfo(theAlert)
> 		return
> 	end
>
> Unfortunately, I can't do anything but one-button messages, because  
> I can't get the return code back from the NSAlert. The call to  
> 'beginSheetModalForWindow...' looks like this in Objective-C:
>
> beginSheetModalForWindow:[someWindow window]
> 	modalDelegate:self
> 	didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:)
> 	contextInfo:nil
>
> How exactly can I get a parameterized selector into this thing? In  
> other words,  how do I do
> 	@selector(alertDidEnd:returnCode:contextInfo:)
> in RubyCocoa?

Is your callback method being called? Your ruby method:

    def alertDidEnd_returnCode_contextInfo(theAlert)

doesn't have the right signature, because it's supposed to take three  
arguments:

    def alertDidEnd_returnCode_contextInfo(theAlert,code,context)

Does using the 'code' argument there work?

I think you can also use symbols for selectors (instead of strings)  
e.g.,  :alertDidEnd_returnCode_contextInfo. Don't think it makes any  
difference, just a matter of choice.

Hope that helps,
Jonathan

Re: [Rubycocoa-talk] @selector thingamabob.

[Dave H. <gr...@gr...>]

On Jan 20, 2006, at 13:11, Jonathan Paisley wrote:

> On 20 Jan 2006, at 20:49, Dave Howell wrote:
>
>> 	def alertDidEnd_returnCode_contextInfo(theAlert)
>> 		return
>> 	end
>>
>> Unfortunately, I can't do anything but one-button messages, because I 
>> can't get the return code back from the NSAlert. The call to 
>> 'beginSheetModalForWindow...' looks like this in Objective-C:
>>
>> beginSheetModalForWindow:[someWindow window]
>> 	modalDelegate:self
>> 	didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:)
>> 	contextInfo:nil
>>
>> How exactly can I get a parameterized selector into this thing? In 
>> other words,  how do I do
>> 	@selector(alertDidEnd:returnCode:contextInfo:)
>> in RubyCocoa?
>
> Is your callback method being called? Your ruby method:
>
>    def alertDidEnd_returnCode_contextInfo(theAlert)
>
> doesn't have the right signature, because it's supposed to take three 
> arguments:
>
>    def alertDidEnd_returnCode_contextInfo(theAlert,code,context)

Not according to RubyCocoa. Like I said, the code as listed works 
"correctly."

If I change my callback method to
	def alertDidEnd_returnCode_contextInfo(theAlert, returnCode, 
contextInfo)

then the entire app blows apart:
	rb_main.rb:22: [BUG] Bus Error

Any attempt to add a second parameter to the callback method causes 
that result.

> Does using the 'code' argument there work?
>
> I think you can also use symbols for selectors (instead of strings) 
> e.g.,  :alertDidEnd_returnCode_contextInfo. Don't think it makes any 
> difference, just a matter of choice.

Well, it's a string because I was trying to get the parameters to pass 
properly, like
	'alertDidEnd_returnCode_contextInfo:returnCode:contextInfo"
or
	"@selector(alertDidEnd:returnCode:contextInfo"

But all such guesses failed one way or the other.

Re: [Rubycocoa-talk] @selector thingamabob.

[Dave H. <gr...@gr...>]

Whaddyaknow. I just ran across the same problem in a different context.



@myTableView.setDoubleAction(no_known_way_to_set_this)


setDoubleAction also requires a "selector", just like 
beginSheetModalForWindow.

:/

Re: [Rubycocoa-talk] @selector thingamabob.

[Neil S. <ne...@ha...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Dave Howell wrote:
> Well, it's a string because I was trying to get the parameters to pass
> properly, like
>     'alertDidEnd_returnCode_contextInfo:returnCode:contextInfo"

You want something like this

def alertDidEnd_returnCode_contextInfo(alert, code, info)
...
end

...
selector = 'alertDidEnd:returnCode:contextInfo:'

Note the colon at the end.
- --
Neil Stevens - ne...@ha...
"There is nothing patriotic about hating your country, or pretending
that you can love your country but despise your government."
 -- William Jefferson Clinton
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.1 (Darwin)

iD8DBQFD0XqKf7mnligQOmERAheqAJsFtqHcVSK2RjHPOrWdr36p9mdCLgCghyV8
0sktiNi2WkueAieNGL04Q+4=
=2PGI
-----END PGP SIGNATURE-----

Re: [Rubycocoa-talk] @selector thingamabob.

[Dave H. <gr...@gr...>]

On Jan 20, 2006, at 16:04, Neil Stevens wrote:
>
> You want something like this
>
> def alertDidEnd_returnCode_contextInfo(alert, code, info)
> ...
> end
>
> ...
> selector = 'alertDidEnd:returnCode:contextInfo:'
>
> Note the colon at the end.

And that was exactly the missing piece. Thanks!