[Qgis-developer] Python plugin architecture and renderer plugins

[Chris Crook]

Hi

I'm wanting to implement a python based renderer as a plug-in.

This seems straightforward, but there are a couple of interface issues that I cannot fix.

The problem is with the unload function of the class factory.  I cannot unload the plugin if there are current layers rendered using it, so ideally what I want to do is to be able to cancel the unload, or at least postpone it till Quantum exits.

The other thing I want to do is notify users that if they do unload the plugin that they may not be able to reload projects which contain layers rendered using the plugin renderer - if it is no longer installed then the project will fail to reload the layers.

I thought I could do this in the unload function by displaying a dialog box.  However the unload function is called when Quantum exits, as well as when the plugin is unregistered.   I don't want the dialog to pop up every time the user exits.

It looks like I need an uninstall function in the class factory, which is called by the plugin manager before it is uninstalled, and which can cancel the uninstall.

Is there any such function?

Thanks
Chris



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