[desc][qt] use QVariantList for list-type properties

* required for PySide2 > 5.11.1 (and compatible with 5.11.1)
* AttributeItemDelegate: test for list length to determine whether to create a slider component (if range is set to None on Python side, it will be an empty list on the QML/JS side)

meshroom/common/__init__.py

@@ -7,13 +7,14 @@ Signal = None
 Property = None
 BaseObject = None
 Variant = None
+VariantList = None
 
 if meshroom.backend == meshroom.Backend.PYSIDE:
     # PySide types
-    from .qt import DictModel, ListModel, Slot, Signal, Property, BaseObject, Variant
+    from .qt import DictModel, ListModel, Slot, Signal, Property, BaseObject, Variant, VariantList
 elif meshroom.backend == meshroom.Backend.STANDALONE:
     # Core types
-    from .core import DictModel, ListModel, Slot, Signal, Property, BaseObject, Variant
+    from .core import DictModel, ListModel, Slot, Signal, Property, BaseObject, Variant, VariantList
 
 
 class _BaseModel:

meshroom/common/core.py

@@ -145,3 +145,4 @@ Signal = CoreSignal
 Property = CoreProperty
 BaseObject = CoreObject
 Variant = object
+VariantList = object

meshroom/common/qt.py

@@ -373,3 +373,4 @@ Signal = QtCore.Signal
 Property = QtCore.Property
 BaseObject = QtCore.QObject
 Variant = "QVariant"
+VariantList = "QVariantList"

meshroom/core/desc.py

@@ -1,4 +1,4 @@
-from meshroom.common import BaseObject, Property, Variant
+from meshroom.common import BaseObject, Property, Variant, VariantList
 from meshroom.core import pyCompatibility
 from enum import Enum  # available by default in python3. For python2: "pip install enum34"
 import collections
@@ -129,7 +129,7 @@ class IntParam(Param):
         except:
             raise ValueError('IntParam only supports int value (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))
 
-    range = Property(Variant, lambda self: self._range, constant=True)
+    range = Property(VariantList, lambda self: self._range, constant=True)
 
 
 class FloatParam(Param):
@@ -145,7 +145,7 @@ class FloatParam(Param):
         except:
             raise ValueError('FloatParam only supports float value (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))
 
-    range = Property(Variant, lambda self: self._range, constant=True)
+    range = Property(VariantList, lambda self: self._range, constant=True)
 
 
 class ChoiceParam(Param):
@@ -174,7 +174,7 @@ class ChoiceParam(Param):
             raise ValueError('Non exclusive ChoiceParam value should be iterable (param:{}, value:{}, type:{})'.format(self.name, value, type(value)))
         return [self.conformValue(v) for v in value]
 
-    values = Property(Variant, lambda self: self._values, constant=True)
+    values = Property(VariantList, lambda self: self._values, constant=True)
     exclusive = Property(bool, lambda self: self._exclusive, constant=True)
     joinChar = Property(str, lambda self: self._joinChar, constant=True)
 

meshroom/ui/qml/GraphEditor/AttributeItemDelegate.qml

@@ -247,7 +247,7 @@ RowLayout {
                 Loader {
                     id: slider
                     Layout.fillWidth: true
-                    active: attribute.desc.range != undefined
+                    active: attribute.desc.range.length === 3
                     sourceComponent: Slider {
                         readonly property int stepDecimalCount: stepSize <  1 ? String(stepSize).split(".").pop().length : 0
                         readonly property real formattedValue: value.toFixed(stepDecimalCount)