[Qgis-psc] [QGIS-Developer] Grant report: Rework handling of multi-layer, mixed-format datasets

[Tim Sutton]

Wow great work Nyall!

Regards

Tim

Sent from my iPhone

> On 28 Jul 2021, at 07:43, Paolo Cavallini <cavallini at faunalia.it> wrote:
> 
> Thanks a lot Nyall, I'm sure you did more and better work than it was expected. Our donors can be happy.
> Cheers.
> 
> Il 28 luglio 2021 07:02:30 EEST, Nyall Dawson <nyall.dawson at gmail.com> ha scritto:
>> 
>> Hi lists,
>> 
>> Just reporting in the conclusion of the grant work: "Rework handling
>> of multi-layer, mixed-format datasets". You can read more about the
>> motivation behind this work at
>> https://github.com/qgis/QGIS-Enhancement-Proposals/issues/216
>> 
>> While the work was partly motivated as an opportunity to clean up some
>> older parts of the QGIS codebase which were fragile and had low test
>> coverage, it has also resulted in many improvements and polish in the
>> QGIS user interface. Specifically:
>> 
>> - There's a much improved dialog shown when a user has to pick from
>> multiple layers from a dataset dropped onto QGIS. The dialog will
>> populate in a background thread, avoiding the UI hangs older QGIS
>> versions experience when scanning for layers in large files. The
>> dialog shows a unified view of all layers in the dataset, regardless
>> of whether they are vector, raster or mesh layers. There's also a new
>> "filter" widget allowing users to quickly find matching layers in
>> larger datasets.
>> 
>> - The browser view of files and file-based datasources has been
>> reworked. You'll no longer see duplicate entries for the same files
>> when these files can be read as either raster/vector/mesh layers (e.g.
>> for netcdf files, geopdf files and other mixed-format types). A lot of
>> consistency has been added to the right click actions you see when
>> interacting with file based items, with many bugs fixed along the way.
>> 
>> Under the hood, we've now got a flexible API for querying sublayers of
>> a dataset which can be easily extended to new providers so that they
>> automatically participate in the unified sublayers dialog and browser
>> items. It's all protected by a huge number of new unit tests, the
>> majority of which cover critical functionality which was previously
>> not being tested.
>> 
>> Thanks for funding this work!
>> Nyall
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> 
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