The geometry cache was only used for few geometry editing operations anyway. In earlier versions
of QGIS the geometry cache was also used by old snapping classes which have been replaced
by QgsPointLocator that also keeps a spatial index of geometries and it is not rebuilt on every re-render.
Reasons for removal:
- geometry cache was repopulated on every redraw of layers in editing mode, slowing down rendering
- data structure for the cache was a simple map with features accessed by their ID (no spatial index)
- the cache was only getting refreshed for the current view of the main map canvas (not a generic cache)
- not used for snapping anymore where caching was important to avoid roundtrips to data provider
- provider() was renamed to createProvider()
- selectWidget() was renamed to createSelectionWidget()
- providerLibrary() was renamed to createProviderLibrary()
of new memory layers from QgsFields/QgsCoordinateReferenceSystem/etc
Since memory provider cannot use QgsVectorLayerImport we need
another centeralized function for creating new memory layers
without the need to manually create the uri string.
This commit introduces basic support for non-library based
data providers, and moves the memory provider from a library
based provider to a core provider.
The memory provider is used so frequently throughout QGIS that
it has become integral to QGIS functionality and must be
available wherever the QGIS core library is used.
The changes here (while not exposed yet to Python) could potentially
be built on to allow creation of pure Python data providers.
there was an issue in libdxf which includes qgslogger in debug mode
and qgsdebug.h includes qgis.h include qgswkbtypes.h (which geometry directory was not listed in libdxrw included paths)
Adds a new abstract base class QgsMetadataValidator for validating
metadata against standard schemas.
Initially only QgsNativeMetadataValidator for validating against
the native QGIS metadata schema is implemented.
In future this could be extended with Dublin Core, ISO 19115
validators, etc...
QgsLayerMetadata handles storage and management of the metadata
for a QgsMapLayer. This class is an internal QGIS format with a common
metadata structure, which allows for code to access the metadata properties for
layers in a uniform way.
The metadata store is designed to be compatible with the Dublin Core metadata
specifications, and will be expanded to allow compatibility with ISO specifications
in future releases. However, the QGIS internal schema does not represent a superset
of all existing metadata schemas and accordingly conversion from specific
metadata formats to QgsLayerMetadata may result in a loss of information.
This class is designed to follow the specifications detailed in
the schema definition available at resources/qgis-resource-metadata.xsd
within the QGIS source code.
