[Qgis-developer] How to debug and unit test Python plugins outside QGIS (e.g. in Ecplise IDE + PyDev)

[Tim Sutton]

Hi

On Tue, Jan 10, 2012 at 7:08 PM, Martin Dobias <wonder.sk at gmail.com> wrote:
>> On Thu, Mar 3, 2011 at 10:40 AM, Martin Dobias <wonder.sk at gmail.com> wrote:
>>
>>> The only difference when running unit-tests (i.e. standalone apps) is
>>> that you cannot access QGIS interface (qgis.utils.iface) since there
>>> is no QGIS running. But that should not pose a big problem. In case
>>> you really need access to that interface you can create your own
>>> implementation of QgisInterface class and assign it to
>>> qgis.utils.iface.
>>>
>>> Regards
>>> Martin
>>
>> Martin do you (or anyone else) have example code for creating an iface
>> instance from a standalone python / QGIS app?
>
> Hi Tim
>
> no I do not have a working example. In general it should be something like this:
>
> import qgis.utils
> import qgis.gui
>
> class MyQgisInterface(qgis.gui.QgisInterface):
>  def __init__(self):
>    QgisInterface.__init__(self)
>  def mapCanvas(self):
>    return FOO
>  def mainWindow(self):
>    return BAR
>  def activeLayer(self):
>    return BAZ
>  # ... more methods ...
>
> # use our interface instance
> qgis.utils.iface = MyQgisInterface()
>
> You will have to provide implementation of all the abstract virtual
> functions defined in QgisInterface. Luckily most of them are not used
> by plugins, so you may provide just implementations not
> doing/returning anything - depending on how precisely would you like
> to imitate QGIS environment.
>

Thanks Martin. Yes I have used the same approach in openModeller
desktop some years ago to allow it to use QGIS (C++) plugins - I was
just interested to know if someone had already baked a python
equivalent in keeping with DRAY (dont repeat anyone else :-)).

I'll go ahead and make an attempt at a python one then, thanks.

Regards

Tim


> Regards
> Martin



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