[Qgis-developer] Memory layer saver plugin to core?

[Nathan Woodrow]

Hey Chris,

As we are now in a feature freeze it might be a bit late to bring it in
however I would like to see it as a core part of QGIS, not as a plugin, but
as something that just happens when the user saves the project.  The New
Memory Layer plugin should also be moved into core of the program as it's
great for creating quick one of layers.

- Nathan


On Wed, Apr 3, 2013 at 9:10 AM, Chris Crook <ccrook at linz.govt.nz> wrote:

>  Hi All****
>
> ** **
>
> I’m wondering if there would be any support for moving the memory layer
> saver plugin to core. ****
>
> ** **
>
> At the moment many plugins create scratch memory layers, and the current
> default behaviour of QGis is to silently drop the data when the project is
> saved – when the user reloads the project the layers are still there, but
> the data is not (for example if they have created contours).  This seems a
> really bad user experience.****
>
> ** **
>
> The memory layer saver plugin when installed simply saves the layers with
> the project, and automatically reloads them (at least for users with python
> installed, who are most likely to create memory layers).****
>
> ** **
>
> I think that it is a fundamental user expectation that when they see the
> same thing as when they saved it that this should at the very least be part
> of the core distribution, and possibly enabled by default.  ****
>
> ** **
>
> I have recently updated this to use a Qt binary stream (QDataStream) for
> all memory layers as a single file, rather than using GML format.  This may
> not appeal to some users, but it avoids problems that happened with passing
> the data through the OGR mapping, which was creating problems in restoring
> the attributes correctly (due to handling of the fid).  The Qt stream is a
> simple and efficient mechanism to avoid these issues.  An alternative would
> be to create an SQLite database, but that requires much more work, and will
> still end up with something which is not necessarily useful outside QGIS.*
> ***
>
> ** **
>
> The plugin will need some rework for QGIS version 2 I suspect, in terms of
> iterating through the layer. But this should be minor.  ****
>
> ** **
>
> The QDataStream version of the plugin is at
> http://plugins.qgis.org/plugins/MemoryLayerSaver/****
>
> ** **
>
> Cheers****
>
> Chris****
>
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