fix: fix float slider readout widget for qt

src/magicgui/backends/_qtpy/widgets.py

@@ -594,6 +594,9 @@ def _mgui_set_tracking(self, value: bool) -> None:
             self._qwidget.setTracking(value)
 
     def _pre_set_hook(self, value):
+        return self._cast(value)
+
+    def _cast(self, value: Any) -> Any:
         return int(value)
 
 
@@ -655,17 +658,17 @@ def _mgui_get_native_widget(self) -> QtW.QWidget:
     def _mgui_set_min(self, value: float):
         """Set the minimum possible value."""
         super()._mgui_set_min(value)
-        self._readout_widget.setMinimum(self._pre_set_hook(value))
+        self._readout_widget.setMinimum(self._cast(value))
 
     def _mgui_set_max(self, value: float):
         """Set the maximum possible value."""
         super()._mgui_set_max(value)
-        self._readout_widget.setMaximum(self._pre_set_hook(value))
+        self._readout_widget.setMaximum(self._cast(value))
 
     def _mgui_set_step(self, value: float):
         """Set the step size."""
         super()._mgui_set_step(value)
-        self._readout_widget.setSingleStep(self._pre_set_hook(value))
+        self._readout_widget.setSingleStep(self._cast(value))
 
     def _mgui_get_adaptive_step(self) -> bool:
         return (
@@ -716,6 +719,9 @@ def _update_precision(self, minimum=None, maximum=None, step=None):
                 self._mgui_set_min(self._mgui_get_min() * ratio)
             # self._mgui_set_step(self._mgui_get_step() * ratio)
 
+    def _cast(self, value: Any) -> Any:
+        return float(value)
+
     def _post_get_hook(self, value):
         return value / self._precision
 

tests/test_widgets.py

@@ -1176,3 +1176,11 @@ def f(x: Set[Lit]):
     sel = f.x
     assert type(sel) is widgets.Select
     assert sel.choices == get_args(Lit)
+
+
+def test_float_slider_readout():
+    sld = widgets.FloatSlider(value=4, min=0.5, max=10.5)
+    assert sld.value == 4
+    assert sld._widget._readout_widget.value() == 4
+    assert sld._widget._readout_widget.minimum() == 0.5
+    assert sld._widget._readout_widget.maximum() == 10.5