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Icon URI [message #1034628]

Fri, 05 April 2013 13:35

Jo Jaquinta
Messages: 40
Registered: January 2013
Location: Boston

Member

The application I am porting to e4 had some infrastructure around sourcing icons. Mostly I had an icon sheet and could pull individual icons off of the one graphic. Additional options let me reverse, flip, crop or do other manipulations when requesting an image.
I'm wondering what options there are for Icon URIs in e4. Is there a hook somewhere that I can supply my own handler? For example it would be nice to be able to supply a URI like "joicon://name/crop:10,20x30,30" or some such that eventually calls my handler with the URI, which returns an ImageDescriptor.
If there isn't a system like that already, are there any alternatives to the platform: option?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jo Grant, Senior Software Engineer
Admin and Config Console Architect
OpenPages, IBM

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Re: Icon URI [message #1037133 is a reply to message #1034628]

Tue, 09 April 2013 03:50

Brian de Alwis
Messages: 127
Registered: January 2012

Senior Member

You can define your own URI scheme handler using the OSGi URL Handler Service. See the following comment for pointers:

http://www.cooljeff.co.uk/2009/12/12/custom-url-protocols-and-multiple-classloaders/#comment-127

Your handler would transform the images into a PNG or GIF.

Brian.

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Re: Icon URI [message #1037435 is a reply to message #1037133]

Tue, 09 April 2013 10:56

Jo Jaquinta
Messages: 40
Registered: January 2013
Location: Boston

Member

Perfect! That got me going. I now have a protocol that uses my internal icon sourcer/modifier.
The link you gave has some dead ends though. Searching around based on that I did find a good page here:
http://dz.prosyst.com/pdoc/mbs_ext_6.1/um/mbrowser/developerguide/handler.html

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jo Grant, Senior Software Engineer
Admin and Config Console Architect
OpenPages, IBM

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