Use parentWidget() instead of parent() when a QWidget is expected

Author: cdebonnel

plotpy/external/sliders/_range_style.py

@@ -262,10 +262,10 @@ def parse_color(color: str, default_attr) -> QColor | QGradient:
 def update_styles_from_stylesheet(obj: _GenericRangeSlider):
     qss: str = obj.styleSheet()
 
-    parent = obj.parent()
+    parent = obj.parentWidget()
     while parent is not None:
         qss = parent.styleSheet() + qss
-        parent = parent.parent()
+        parent = parent.parentWidget()
     qss = QApplication.instance().styleSheet() + qss
     if not qss:
         return

plotpy/plot/base.py

@@ -1302,7 +1302,7 @@ def add_item(
         self.SIG_ITEMS_CHANGED.emit(self)
 
         if isinstance(item, BaseImageItem):
-            parent: QW.QWidget = self.parent()
+            parent = self.parentWidget()
             if parent is not None:
                 parent.setUpdatesEnabled(False)
             self.update_colormap_axis(item)

plotpy/tools/image.py

@@ -598,7 +598,7 @@ def activate_command(self, plot: BasePlot, checked: bool) -> None:
         ):
             return
         manager = ColorMapManager(
-            plot.parent(), active_colormap=self._active_colormap.name
+            plot.parentWidget(), active_colormap=self._active_colormap.name
         )
         manager.SIG_APPLY_COLORMAP.connect(self.update_plot)
         if exec_dialog(manager) and (cmap := manager.get_colormap()) is not None:
@@ -1325,7 +1325,7 @@ def activate_command(self, plot: BasePlot, checked: bool) -> None:
             if isinstance(item, TrImageItem):
                 z = int(item.z())
                 plot.del_item(item)
-                dlg = RotateCropDialog(plot.parent(), options=self.options)
+                dlg = RotateCropDialog(plot.parentWidget(), options=self.options)
                 dlg.set_item(item)
                 ok = dlg.exec()
                 plot.add_item(item, z=z)

plotpy/widgets/fit.py

@@ -298,13 +298,13 @@ def update_slider_value(self):
         """Update slider value"""
         if self.value is None or self.min is None or self.max is None:
             self.slider.setEnabled(False)
-            if self.slider.parent() and self.slider.parent().isVisible():
+            if self.slider.parentWidget() and self.slider.parentWidget().isVisible():
                 self.slider.show()
         elif self.value == self.min and self.max == self.min:
             self.slider.hide()
         else:
             self.slider.setEnabled(True)
-            if self.slider.parent() and self.slider.parent().isVisible():
+            if self.slider.parentWidget() and self.slider.parentWidget().isVisible():
                 self.slider.show()
             if self.logscale:
                 value_delta = max([np.log10(1 + self.value - self.min), 0.0])
@@ -366,7 +366,7 @@ def add_fitparam_widgets_to(
     row_nb = 0
     col_nb = 0
     for i, param in enumerate(fitparams):
-        param.create_widgets(layout.parent(), refresh_callback)
+        param.create_widgets(layout.parentWidget(), refresh_callback)
         widgets = param.get_widgets()
         w_colums = len(widgets) + 1
         row_contents += [