[Zope] icons not in __init__.py

[Peter Bengtsson]

Thank you. That worked perfectly for me!

 --- Brian Lloyd <brian.lloyd@zope.com> wrote: > >
When stating which icon to use for a python
> product you do that 
> > like this in __init__.py
> > icon="event.gif" 
> > 
> > But what about subclasses which are object on
> their own? They 
> > don't use the initialize() method.
> > 
> > I have tried:
> > 
> > class SubClassObject(ObjectManager, etc):
> >         meta_type='Event'
> >         icon='event.gif'
> > 
> > where event.gif is a valid gif next to the .py
> file I write this in.
> > That didn't work!
> > 
> > So, I have also tried:
> > 
> >   icon="misc_/MyProduct/event.gif"  and 
> icon="misc_/MyProduct/event"
> > and
> >   icon="/misc_/MyProduct/event.gif"  and 
> icon="/misc_/MyProduct/event"
> > 
> > Nothing has worked?
> > Zope 2.4.0
> > What's the trick?
> 
> [ Brian's product development tip-o-the-day :) ]
> 
> Sorry for the long inclusion above, but I thought it
> will be 
> useful one day to have the context when someone
> searches the 
> mailing list for the answer to this...
> 
> The "normal" way that icons get associated with
> classes is 
> somewhat opaque:
> 
> (in an __init__.py):
> 
>     context.registerClass(
>         instance_class = MyModule.MyClass,
>         meta_type      = 'My Object',
>         permission     = 'Add My Objects',
>         constructors   = MyModule.constructors,
>         icon           = 'www/MyClass.gif'
>       )
> 
> The 'registerClass' helper automatically sets up
> your icon. It 
> can do that because it gets and / or knows:
> 
>   o the class object
> 
>   o the relative path to the file you want to use
> for
>     the icon ('www/MyClass.gif')
> 
>   o the package that is being registered
> 
> So what it does is:
> 
>   o creates an ImageFile object (the ImageFile class
> is located 
>     in the App.ImageFile module)
> 
>   o adds the ImageFile instance to a special place
> where 
>     miscellanous static web-accessible resources for
> use 
>     by products are kept
> 
>   o adds an 'icon' attribute to the class being
> registered 
>     whose value is the url to the ImageFile instance
> 
> This is the 'misc_' funny business you see in icon
> urls. The
> 'misc_' object is a child of the root Zope object.
> When 
> a product is initialized, a generic container is
> created in 
> misc_, named after the product being initialized.
> registerClass
> does a setattr on the generic container for the
> product, making 
> the ImageFile instance available through traversal
> as 
> /misc_/ProductName/filename.
> 
> (Note that these things are set as class attributes
> rather than 
> instance attributes, so they are not persistent and
> go away at 
> shutdown, and are rebuilt at the next startup).
> 
> So... to set up an icon for an object that is not
> registered 
> using registerClass, we just need to change the
> __init__.py 
> to create ImageFiles for the extra icons we need,
> add those 
> ImageFile instances to the container for our product
> in 
> misc_, and add appropriate 'icon' attributes to our
> classes 
> whose values are url paths to the appropriate
> ImageFiles.
> 
> 
> 
> (in __init__.py)
> 
> def initialize(context):
>     # standard registration for MyClass, which is a
> normal
>     # through-the-web creatable object. Note that
> after
>     # registering MyClass, we call our registerIcon
> helper 
>     # function to register icons for MyOtherClass1
> and MyOtherClass2,
>     # which are not directly registered using
> registerClass.
> 
>     context.registerClass(
>         instance_class = MyModule.MyClass,
>         meta_type      = 'My Object',
>         permission     = 'Add My Objects',
>         constructors   = MyModule.constructors,
>         icon           = 'www/MyClass.gif'
>       )
> 
>     registerIcon('MyOtherClass1.gif')
>     registerIcon('MyOtherClass2.gif')
> 
> 
> import OFS, App
> 
> def registerIcon(filename):
>     # A helper function that takes an image filename
> (assumed
>     # to live in a 'www' subdirectory of this
> package). It 
>     # creates an ImageFile instance and adds it as
> an attribute
>     # of misc_.MyPackage of the zope application
> object (note
>     # that misc_.MyPackage has already been created
> by the product
>     # initialization machinery by the time
> registerIcon is called).
> 
>     setattr(OFS.misc_.misc_.MyPackage, 
>             filename, 
>             App.ImageFile.ImageFile('www/%s' %
> filename, globals())
>             )
> 
> 
> Now we just need to add 'icon' attributes to our
> 'Other' classes:
> 
> 
> (in MyModule.py)
> 
> class MyOtherClass1:
> 
>   icon = 'misc_/MyProduct/MyOtherClass1.gif'
>   ...
> 
> class MyOtherClass2:
> 
>   icon = 'misc_/MyProduct/MyOtherClass2.gif'
>   ...
> 
> 
> Hope this helps!
> 
> 
> Brian Lloyd        brian@zope.com
> Software Engineer  540.361.1716       
> Zope Corporation   http://www.zope.com
> 
> 
> 
>  

=====
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I use to send until I get my email stuff together.
You can always continue to send to my real address which is 
mail@peterbe.com

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