Re: [Pyobjc-dev] Cocoa Sheets

[Ronald O. <ous...@ci...>]

On Wednesday, Jun 11, 2003, at 18:22 Europe/Amsterdam, Bob Swerdlow  
wrote:

> I'm trying to use
> NSApplication.beginSheet_modalForWindows_modalDelegate_didEndSelector_c 
> ontex
> tinfo_ to create a sheet on a window, but I don't seem to be setting  
> it up
> right .  When it goes to call the didEndSelector method I get a bus  
> error :(

I'm having no problems with  
NSOpenPanel..beginSheetForDirectory_file_types_modalForWindow_modalDeleg 
ate_didEndSelector_contextInfo_, which uses a simular protocol.

>
>
> The method that I want called is defined in class MyClass as:
>     def sheedDidEnd_sheet_returnCode_contextInfo_(self, sheet,  
> returnCode,
> contextInfo):
>
> I'm trying to invoke the sheet as:
>
> application.beginSheet_modalForWindow_modalDelegate_didEndSelector_cont 
> extin
> fo( \
>             self.panel, self.window, self,
> sheedDidEnd_sheet_returnCode_contextInfo_selector, 0)
>
> where I have set up sheedDidEnd_sheet_returnCode_contextInfo_selector  
> with:
     sheedDidEnd_sheet_returnCode_contextInfo_selector = objc.selector \
         (sheedDidEnd_sheet_returnCode_contextInfo_, signature='v@:@ii')

That's the same as I'm using, it must be correct then :-) I don't think  
we have documentation for the signature strings in our documentation.  
They are equal to the signature strings used in the Objective-C  
runtime, and those a described in Apple's Objective-C manual.

I think we should add a conviencefunction for this, something like  
'NSSheetEndMethod'. Your code would then be something like the  
assignment below, without an ugly signature string.

	sheedDidEnd_sheet_returnCode_contextInfo_selector = NSSheetEndMethod(
         sheedDidEnd_sheet_returnCode_contextInfo_)

Ah, now I see the problem: selector should be used like 'classmethod',  
the assigment in your code should read:
	 sheedDidEnd_sheet_returnCode_contextInfo = objc.selector \
         (sheedDidEnd_sheet_returnCode_contextInfo_, signature='v@:@ii')

The result of the selector function should be assigned to the same name  
as the orignal function (e.g. dont add '_selector' to the name!).

Ronald