[QGIS-Developer] Handy methods to Copy/Paste Features via QgisInterface

[Germán Carrillo]

Hi qgis-devs,


what do you think about exposing methods to copy/paste features from/to
*given layers* through QgisInterface?

Such methods are available in qgisapp.cpp already [1], but plugin devs
cannot access them. What is exposed right now are the actionCopyFeatures
and actionPasteFeatures, which:

1) Require the layers to be loaded in the QGIS Layer Tree.
2) Require the layers to be active when the corresponding method is called.

There is really no need for those 2 GUI-related requirements.


I've created a Pull Request [2] to make it possible to use source and
target layers for copy/paste operations without loading them into the Layer
Tree, which is much more handy for people using the QGIS API.

That is, you have both layers and just pass them as parameters to the
corresponding copy/paste methods:

>> source_layer.selectAll()
>> iface.copyFeatures(source_layer)
>> target_layer.startEditing()
>> iface.pasteFeatures(target_layer)


*FYI, I'm using copy/paste features functionality to mimic an append
operation from one layer to another, which I've found difficult to achieve
with the API or  even using current Processing algorithms.*


Does it make sense for you?


Regards,

Germán
------------
[1] https://github.com/qgis/QGIS/blob/master/src/app/qgisapp.cpp#L8071-L8192
[2] https://github.com/qgis/QGIS/pull/5578


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