[Qgis-developer] RFC vector data providers handling
wonder.sk at gmail.com
Wed Apr 30 20:21:00 EDT 2008
On Tue, Apr 22, 2008 at 7:37 PM, Jürgen E. Fischer <jef at norbit.de> wrote:
> Above is as good as a list of methods I'd like to add to the providers.
> I intended to add class methods. But we could also add and export
> functions (or wrappers for the class methods; similar to
> QGISEXTERN QStringList getConnections();
> // would return a of registered connection names in the driver
> // QgsSourceSelect would call it to fill the connection combobox after
> // the provider is selected. This should also get an "New..." entry.
> QGISEXTERN bool editConnection(QString connection);
> // would be tied to the add/edit button and add/edit a selected
> // connection in the combobox and open a provider specific dialog box.
> // That gui could optionally include and "Add Layer..." button to create
> // a new layer (ie. QgsGeomTypeDialog for OGR, but not tied to just
> // shapes).
> QGISEXTERN bool removeConnection(QString connection);
> // would be tied to the remove button to remove the connection
> QGISEXTERN QDomNode *getLayerList(QString connection);
> // would be tied to the list layers button (to replace "Connect")
> // and return a list of layers that is used to fill QgsSourceSelect
> // lists layer list.
> QGISEXTERN QgsMapLayer *getLayer(const QDomNode *);
> // would instantiate a QgsMapLayer with a selected layer
with such set of functions we get close to the model used in OGR
(which I think we should start using too) which has:
- layer - same as QGIS layer
- data source - can consist of many layers - in QGIS there's no equivalent
- driver - more or less what's provider in QGIS
Adding notion of data sources we'll be able to solve several
long-standing thinks like creating new layers, managing connections to
databases and finally creating an unified vector/data loading dialog.
Just throwing some ideas ;-)
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