[MacRuby-devel] NSImage issue?

[Brad Wilson]

I think there's a problem with your method call. If you look at the  
cocoa doc is has a selector with the signature:
drawInRect:fromRect:operation:fraction.

To call that from MacRuby you'd want to do something like:
icon.drawInRect(rect, fromRect:NSZeroRect,  
operationNSCompositeSourceOver, fraction:1.0.

See the way the named arguments line up? That'll work for any cocoa  
call. There's some discussion on the MacRuby tutorial under "Sending  
Messages" at http://www.macruby.org/trac/wiki/MacRubyTutorial


Another tip I got from somebody on the list:
object.methods(true, true) will give you a list of all methods on an  
object, including objective-c methods. That might help in future if  
you're not sure what the method call should be.

Hope that helps.

Brad


On 13/11/2008, at 8:11 PM, pedro gutierrez wrote:

> Hi everybody,
>
> This is my first message to the mailing list, I am a newbie in Cocoa  
> so please bear with me...
>
> In my first serious MacRuby project,  I have subclassed  
> NSTextFieldCell and I have redefined drawInteriorWithFrame with the  
> following code:
>
> 	def drawInteriorWithFrame( rect, inView:view )
> 		
> 		icon = NSImage.imageNamed( "example" )
> 		
> 		puts icon.methods.join( " " )
> 		puts "icon is valid: #{icon.isValid} and has size #{icon.size}"
> 		
> 		icon.drawInRect( rect, NSZeroRect, NSCompositeSourceOver, 1.0 )
> 	
> 	end
>
> (i.e: I am just trying to draw an icon)
>
> Here is what I get from the console:
>
> [Session started at 2008-11-13 09:01:01 +0000.]
> gem __super_objc_send__ enum_for to_enum object_id __id__  
> define_singleton_method public_method method display extend  
> respond_to? public_send send __send__ instance_exec instance_eval  
> __native__? tap is_a? kind_of? instance_of?  
> instance_variable_defined? instance_variable_set  
> instance_variable_get instance_variables public_methods  
> private_methods protected_methods singleton_methods methods inspect  
> to_s frozen? freeze untaint tainted? taint dup clone eql? !~ =~ ===  
> nil? != ! equal? == hash
> icon is valid: true and has size #<NSSize width=30.0 height=24.0>
> /Users/sicozu/Projects/iAmbient/build/Release/iAmbient.app/Contents/ 
> Resources/PlaylistCell.rb:26:in `drawInteriorWithFrame:inView:':  
> undefined method `drawInRect' for #<NSImage:0x10f2480> (NoMethodError)
> 	from /Users/sicozu/Projects/iAmbient/build/Release/iAmbient.app/ 
> Contents/Resources/PlaylistCell.rb:15:in `drawWithFrame:inView:'
> 	from /Users/sicozu/Projects/iAmbient/build/Release/iAmbient.app/ 
> Contents/Resources/PlaylistCell.rb:15:in `drawWithFrame:inView:'
> 	from /Users/sicozu/Projects/iAmbient/build/Release/iAmbient.app/ 
> Contents/Resources/rb_main.rb:22:in `NSApplicationMain'
> 	from /Users/sicozu/Projects/iAmbient/build/Release/iAmbient.app/ 
> Contents/Resources/rb_main.rb:22:in `<main>'
>
> Can anybody please give me a hint of what I am doing wrong?  
> Shouldn't I expect my instance of NSImage to respond to :drawInRect?
>
> And by the way,  thanks a lot for this sweet MacRuby project !!
> Cheers,
> Pedro.
>
>
> _______________________________________________
> MacRuby-devel mailing list
> MacRuby-devel at lists.macosforge.org
> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.macosforge.org/pipermail/macruby-devel/attachments/20081113/1e79c82d/attachment-0001.html>