SketchupExtension in a single file

thomthom

@dan rathbun said:

But if the attempt is made sometime later, (via a change in the Preferences>Extensions dialog checkbox,) it should fail, during that particular Sketchup session. (The default @load_on_start in the registry will be set true, however, and then it will work, on the next Sketchup restart.)

Ah! I was testing by loading an external file - using load. So my initial load didn't use Sketchup::require. Seems that I need to pop the entry off the stack after registering the extension. Nice catch.

thomthom

@dan rathbun said:

Add to that the Sketchup.register_extension method code was changed on the C side for 8.0M2 ...

What was that?

Dan Rathbun

@thomthom said:

@dan rathbun said:

Add to that the Sketchup.register_extension method code was changed on the C side for 8.0M2 ...

What was that?

To much to explain.. you'll need to read the comments in the code. Scott marks what were the private callbacks from the C side.

But basically calling the method more than once in previous version has no benefit, screwed up the extension list in the dialog.
Now 8.0M2+, the method was changed to expect to be called more than once, and to do things, based upon the change in arg 2.

Dan Rathbun

One reason I am a bit adverse to this idea is, that I was hoping for a day when plugins resided within their author's filespaces, and the plugins directory had nothing but extension registration scripts. All code for actual functionality, would be in subfolders.

I like the idea, of being able, to switch off whole groups of plugins, by author is one way.

Jim

The @extension_registered variable is always false when SketchUp starts, so the menus will never be created after the first time the extension is enabled.

thomthom

@jim said:

The @extension_registered variable is always false when SketchUp starts, so the menus will never be created after the first time the extension is enabled.

Thought I'd fixed that...

Jim

Oh, I was just reading your blog and copy/pasted the code, but I never got the menu to appear. But then later I thought the code should work because SketchUp should go ahead and reload the file as an extension after initially registering. So not sure what's going on.

Dan Rathbun

Re-read my earlier post: http://forums.sketchucation.com/viewtopic.php?f=180&t=43200&#p384925

Your setting up a vicious circle.

Dan Rathbun

What about using a begin ... rescue ... end block to "fool" SketchUp.

Meaning set the path to a file that does NOT exist, which will raise a LoadError Exception.
(EDIT: ..and I think you can just use an empty string for path, in this case.)

begin
  # set up here
  plugin = SketchupExtension.new('Nifty Plugin','dummy')
  # set other attributes
  Sketchup.register_extension(plugin,true)
  # if it attempts to load, the rescue block fires
rescue LoadError
  #
  # A little code for a "quickie" Plugin here.
  #
end

Dan Rathbun

NO (the above,) will not work because Sketchup::require() and Sketchup::load() do not raise LoadError. They just return false on failure, and 0 on success.
(I do have a API bug report filed on this.)

thomthom

@dan rathbun said:

NO (the above,) will not work because Sketchup::require() and Sketchup::load() do not raise LoadError. They just return false on failure, and 0 on success.
(I do have a API bug report filed on this.)

They don't raise LoadError ...? That's interesting.

My mistake was that I tested the whole thing by loading manually from an external location instead of placing the file in the Plugins folder and having it load at startup. My "simulation" was incorrect.