[processing] Fix some exceptions in batch dialog after refactoring

Fixes #19779, #19786

Author: nyalldawson

python/plugins/processing/gui/BatchPanel.py

@@ -135,6 +135,7 @@ def initWidgets(self):
         self.tblParameters.horizontalHeader().setStretchLastSection(True)
 
     def load(self):
+        context = dataobjects.createContext()
         settings = QgsSettings()
         last_path = settings.value("/Processing/LastBatchPath", QDir.homePath())
         filename, selected_filter = QFileDialog.getOpenFileName(self,
@@ -164,7 +165,7 @@ def load(self):
                     if param.name() in params:
                         value = eval(params[param.name()])
                         wrapper = self.wrappers[row][column]
-                        wrapper.setValue(value)
+                        wrapper.setParameterValue(value, context)
                     column += 1
 
                 for out in self.alg.destinationParameterDefinitions():
@@ -195,12 +196,24 @@ def save(self):
                 if param.isDestination():
                     continue
                 wrapper = self.wrappers[row][col]
-                if not param.checkValueIsAcceptable(wrapper.value(), context):
+
+                # For compatibility with 3.x API, we need to check whether the wrapper is
+                # the deprecated WidgetWrapper class. If not, it's the newer
+                # QgsAbstractProcessingParameterWidgetWrapper class
+                # TODO QGIS 4.0 - remove
+                if issubclass(wrapper.__class__, WidgetWrapper):
+                    widget = wrapper.widget
+                else:
+                    widget = wrapper.wrappedWidget()
+
+                value = wrapper.parameterValue()
+
+                if not param.checkValueIsAcceptable(value, context):
                     self.parent.messageBar().pushMessage("", self.tr('Wrong or missing parameter value: {0} (row {1})').format(
                         param.description(), row + 1),
                         level=Qgis.Warning, duration=5)
                     return
-                algParams[param.name()] = param.valueAsPythonString(wrapper.value(), context)
+                algParams[param.name()] = param.valueAsPythonString(value, context)
                 col += 1
             for out in alg.destinationParameterDefinitions():
                 if out.flags() & QgsProcessingParameterDefinition.FlagHidden:
@@ -289,13 +302,15 @@ def removeRows(self):
             self.tblParameters.setRowCount(self.tblParameters.rowCount() - 1)
 
     def fillParameterValues(self, column):
+        context = dataobjects.createContext()
+
         wrapper = self.wrappers[0][column]
         if wrapper is None:
             # e.g. double clicking on a destination header
             return
 
         for row in range(1, self.tblParameters.rowCount()):
-            self.wrappers[row][column].setValue(wrapper.value())
+            self.wrappers[row][column].setParameterValue(wrapper.value(), context)
 
     def toggleAdvancedMode(self, checked):
         for column, param in enumerate(self.alg.parameterDefinitions()):

python/plugins/processing/gui/wrappers.py

@@ -1286,7 +1286,7 @@ def setValue(self, value):
                 self.setComboValue(value)
 
     def value(self):
-        if self.dialogType in DIALOG_STANDARD:
+        if self.dialogType == DIALOG_STANDARD:
             if self.parameterDefinition().multiLine():
                 text = self.widget.toPlainText()
             else: