Clear filter when a new project is loaded or created

Author: jk-wg

controller.py

@@ -29,6 +29,9 @@ def connectSignals(self):
         # the layer filter will happen before the data is actually requested, at least for PostGIS
         QgsProject.instance().layersAdded.connect(self.onLayersAdded)
 
+        # to clear the filter when the project is cleared (e.g. a new project is loaded or created)
+        QgsProject.instance().cleared.connect(self.onProjectCleared)
+
     def disconnectSignals(self):
         QgsProject.instance().layersAdded.disconnect(self.onLayersAdded)
 
@@ -49,6 +52,13 @@ def onLayersAdded(self, layers: Iterable[QgsMapLayer]):
                     self.setFilterFromLayer(layer)
                     return
 
+    def onProjectCleared(self):
+        """Removes the filter if one is active.
+
+        This prevents filters from staying active when the user loads another project or creates a new one.
+        """
+        self.removeFilter()
+
     def setFilterFromLayer(self, layer):
         filterDefinition = FilterDefinition.fromFilterString(layer.subsetString())
         self.currentFilter = filterDefinition

metadata.txt

@@ -3,7 +3,7 @@ name=Räumlicher Filter
 qgisMinimumVersion=3.22
 description=Spatial filters for PostGIS, GeoPackage and Spatialite layers
 description[de]=Räumliche Filter für PostGIS-, GeoPackage- und Spatialite-Layer
-version=1.4
+version=1.5
 author=WhereGroup GmbH (Peter Gipper, Mathias Gröbe, Johannes Kröger)
 email=info@wheregroup.com
 
@@ -17,6 +17,8 @@ hasProcessingProvider=no
 tags=python, filter, vector, postgis, performance
 
 changelog=
+    Version 1.5:
+    - Clear filter when a new project is loaded or created
     Version 1.4:
     - Add padding when zooming to filter geometry (thanks pathmapper!)
     - Add plugin name to messages in message bar