Re: [Pyobjc-dev] applicationShouldOpenUntitledFile_

[Mitch C. <mit...@ea...>]

On Saturday, February 1, 2003, at 11:00 PM, bb...@ma... wrote:

> On Saturday, Feb 1, 2003, at 23:34 US/Eastern, Mitch Chapman wrote:
>> I'm not sure if this is a bug or if I've screwed up my installation.
>>
>> Using the CVS PyObjC (updated about 1930 MST today), with its
>> slightly-modified project templates (see below) installed under 
>> ~/Developer,
>> I created a new Cocoa-Python Document-based application.  Then in
>> MyAppDelegate.py I changed the return value from YES to NO.  When the
>> application started it opened an Untitled document, despite the 
>> changed
>> return value.
>>
>> I'm having similar problems convincing the application that 
>> openFile_ofType_
>> is successful -- I keep getting "Can't open file <pathname>" dialogs.
>>
>> Thanks for any hints.  Please be gentle with the clue stick :)
>
> Very easy fix and not at all obvious.  The problem is that there is no 
> way for the bridge to know that your implementation of the method 
> should return BOOL.  So, you either have to tell the bridge that your 
> method returns a BOOL through the use of the objc.selector() function 
> or, better yet, declare that your class implements the informal 
> NSApplication delegate protocol.
>
> That is, change your class declaration to something like...
>
> class MyAppDelegate(NSObject, NSApplicationDelegate):
>     ....
> [...]
> It also works with the AutoBaseClass mechanism.
>

Hm... I think the project template already did this for me.
(BTW thanks for including the project templates -- way cool.)
Here's the relevant code, showing the class declaration provided by
the template:

# create ObjC classes as defined in MainMenu.nib
NibClassBuilder.extractClasses("MainMenu")
class MyAppDelegate(AutoBaseClass, NSApplicationDelegate):
     def applicationShouldOpenUntitledFile_(self, sender):
         # return NO if you don't want untitled document to be opened on 
app launch
         NSLog("applicationShouldOpenUntitledFile_")
         return NO

The log message is showing up in the PB Run window, right about the
time the unwanted Untitled document appears.

Just for grins I tried replacing 'AutoBaseClass' with 'NSObject', but
the result was the same.  The declaration for the selector in
AppKit/__init__.py looks okay, but I'm new at reading Objective-C
method signatures.

--
Mitch