[processing] use active layer by default in field calculator algorithm

alexbruy · alexbruy · commit 95209d134cad · 2019-01-22T11:04:49.000+02:00
(fix #19686)
diff --git a/python/plugins/processing/algs/qgis/ui/FieldsCalculatorDialog.py b/python/plugins/processing/algs/qgis/ui/FieldsCalculatorDialog.py
@@ -41,9 +41,10 @@
                        QgsProperty,
                        QgsProject,
                        QgsMessageLog,
+                       QgsMapLayer,
                        QgsProcessingOutputLayerDefinition)
 from qgis.gui import QgsEncodingFileDialog, QgsGui
-from qgis.utils import OverrideCursor
+from qgis.utils import OverrideCursor, iface
 
 from processing.core.ProcessingConfig import ProcessingConfig
 from processing.core.ProcessingLog import ProcessingLog
@@ -86,6 +87,12 @@ def __init__(self, alg):
         self.layer = None
 
         self.cmbInputLayer.setFilters(QgsMapLayerProxyModel.VectorLayer)
+        try:
+            if iface.activeLayer().type() == QgsMapLayer.VectorLayer:
+                self.cmbInputLayer.setLayer(iface.activeLayer())
+        except:
+            pass
+
         self.cmbInputLayer.layerChanged.connect(self.updateLayer)
         self.btnBrowse.clicked.connect(self.selectFile)
         self.mNewFieldGroupBox.toggled.connect(self.toggleExistingGroup)
