_Buttons: take layout logic to a dedicated _init function

doronbehar · doronbehar · commit f6273a0faffe · 2026-01-30T10:25:03.000+02:00
diff --git a/lib/matplotlib/tests/test_widgets.py b/lib/matplotlib/tests/test_widgets.py
@@ -1229,8 +1229,7 @@ def test__buttons_callbacks(ax, widget):
         "button_press_event",
         ax,
         ax.transData.inverted().transform(ax.transAxes.transform(
-            # (x, y) of the 0th button defined at
-            # `{Check,Radio}Buttons._init_props`
+            # (x, y) of the 0th button defined at `_Buttons._init_layout`
             (0.15, 0.5),
         )),
         1,
diff --git a/lib/matplotlib/widgets.py b/lib/matplotlib/widgets.py
@@ -1057,16 +1057,7 @@ def __init__(self, ax, labels, *, useblit=True, label_props=None, **kwargs):
 
         self._useblit = useblit
 
-        self._buttons_xs = [0.15] * len(labels)
-        self._buttons_ys = np.linspace(1, 0, len(labels)+2)[1:-1]
-
-        label_props = _expand_text_props(label_props)
-
-        self.labels = [
-            ax.text(0.25, y, label, transform=ax.transAxes,
-                    horizontalalignment="left", verticalalignment="center",
-                    **props)
-            for y, label, props in zip(self._buttons_ys, labels, label_props)]
+        self._init_layout(labels, label_props)
         text_size = np.array([text.get_fontsize() for text in self.labels]) / 2
 
         self._init_props(text_size, **kwargs)
@@ -1077,6 +1068,18 @@ def __init__(self, ax, labels, *, useblit=True, label_props=None, **kwargs):
 
         self._observers = cbook.CallbackRegistry(signals=["clicked"])
 
+    def _init_layout(self, labels, label_props):
+        self._buttons_xs = [0.15] * len(labels)
+        self._buttons_ys = np.linspace(1, 0, len(labels)+2)[1:-1]
+
+        label_props = _expand_text_props(label_props)
+
+        self.labels = [
+            self.ax.text(0.25, y, label, transform=self.ax.transAxes,
+                    horizontalalignment="left", verticalalignment="center",
+                    **props)
+            for y, label, props in zip(self._buttons_ys, labels, label_props)]
+
     def _init_props(self, text_size, **kwargs):
         raise NotImplementedError("This method should be defined in subclasses")
 
