[FEATURE][processing] Add checkbox for each vector input layer

to control whether selected features only are to be used

Replaces the old global setting and makes it immediately obvious
to users when the selection will be respected

Author: nyalldawson

python/plugins/processing/algs/qgis/Boundary.py

@@ -82,8 +82,8 @@ def processAlgorithm(self, parameters, context, feedback):
         if QgsWkbTypes.hasM(input_wkb):
             output_wkb = QgsWkbTypes.addM(output_wkb)
 
-        (sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT_LAYER, context, '',
-                                               source.fields(), output_wkb, source.crs())
+        (sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT_LAYER, context,
+                                               source.fields(), output_wkb, source.sourceCrs())
 
         features = source.getFeatures()
         total = 100.0 / source.featureCount()

python/plugins/processing/gui/wrappers.py

@@ -59,14 +59,16 @@
     QgsProcessingParameterExpression,
     QgsProcessingParameterTable,
     QgsProcessingParameterTableField,
-    QgsProcessingParameterFeatureSource)
+    QgsProcessingParameterFeatureSource,
+    QgsProcessingFeatureSourceDefinition)
 
 from qgis.PyQt.QtWidgets import (
     QCheckBox,
     QComboBox,
     QDialog,
     QFileDialog,
     QHBoxLayout,
+    QVBoxLayout,
     QLineEdit,
     QPlainTextEdit,
     QToolButton,
@@ -760,7 +762,18 @@ def createWidget(self):
             btn.clicked.connect(self.selectFile)
             layout.addWidget(btn)
 
-            widget.setLayout(layout)
+            vl = QVBoxLayout()
+            vl.setMargin(0)
+            vl.setContentsMargins(0, 0, 0, 0)
+            vl.setSpacing(2)
+            vl.addLayout(layout)
+
+            self.use_selection_checkbox = QCheckBox(self.tr('Selected features only'))
+            self.use_selection_checkbox.setChecked(False)
+            self.use_selection_checkbox.setEnabled(False)
+            vl.addWidget(self.use_selection_checkbox)
+
+            widget.setLayout(vl)
 
             filters = QgsMapLayerProxyModel.Filters()
             if QgsProcessingParameterDefinition.TypeVectorAny in self.param.dataTypes():
@@ -775,6 +788,8 @@ def createWidget(self):
             try:
                 if iface.activeLayer().type() == QgsMapLayer.VectorLayer:
                     self.combo.setLayer(iface.activeLayer())
+                    self.use_selection_checkbox.setEnabled(iface.activeLayer().selectedFeatureCount() > 0)
+
             except:
                 pass
 
@@ -787,8 +802,7 @@ def createWidget(self):
                 self.combo.setFilters(filters)
             self.combo.setExcludedProviders(['grass'])
 
-            self.combo.currentIndexChanged.connect(lambda: self.widgetValueHasChanged.emit(self))
-            self.combo.currentTextChanged.connect(lambda: self.widgetValueHasChanged.emit(self))
+            self.combo.layerChanged.connect(self.layerChanged)
             return widget
 
         elif self.dialogType == DIALOG_BATCH:
@@ -818,6 +832,14 @@ def createWidget(self):
             widget.setLayout(layout)
             return widget
 
+    def layerChanged(self, layer):
+        if not layer or layer.type() != QgsMapLayer.VectorLayer or layer.selectedFeatureCount() == 0:
+            self.use_selection_checkbox.setChecked(False)
+            self.use_selection_checkbox.setEnabled(False)
+        else:
+            self.use_selection_checkbox.setEnabled(True)
+        self.widgetValueHasChanged.emit(self)
+
     def selectFile(self):
         filename, selected_filter = self.getFileName(self.combo.currentText())
         if filename:
@@ -840,14 +862,15 @@ def setValue(self, value):
 
     def value(self):
         if self.dialogType == DIALOG_STANDARD:
+            use_selected_features = self.use_selection_checkbox.isChecked()
             try:
                 layer = self.combo.currentLayer()
                 if layer:
-                    return layer.id()
+                    return QgsProcessingFeatureSourceDefinition(layer.id(), use_selected_features)
                 else:
-                    return self.combo.currentText()
+                    return QgsProcessingFeatureSourceDefinition(self.combo.currentText(), use_selected_features)
             except:
-                return self.combo.currentText()
+                return QgsProcessingFeatureSourceDefinition(self.combo.currentText(), use_selected_features)
         elif self.dialogType == DIALOG_BATCH:
             return self.widget.value()
         else: