Merge pull request matplotlib#27409 from ericpre/fix_selection_completed

Fix setting `_selection_completed` in `SpanSelector` when spanselector is initialised using `extents`

Author: ksunden

lib/matplotlib/tests/test_widgets.py

@@ -974,6 +974,23 @@ def onselect(vmin, vmax):
     assert tool.extents == (17, 35)
 
 
+def test_span_selector_extents(ax):
+    tool = widgets.SpanSelector(
+        ax, lambda a, b: None, "horizontal", ignore_event_outside=True
+        )
+    tool.extents = (5, 10)
+
+    assert tool.extents == (5, 10)
+    assert tool._selection_completed
+
+    # Since `ignore_event_outside=True`, this event should be ignored
+    press_data = (12, 14)
+    release_data = (20, 14)
+    click_and_drag(tool, start=press_data, end=release_data)
+
+    assert tool.extents == (5, 10)
+
+
 @pytest.mark.parametrize('kwargs', [
     dict(),
     dict(useblit=False, props=dict(color='red')),

lib/matplotlib/widgets.py

@@ -2684,7 +2684,7 @@ def _press(self, event):
             # visibility to False and extents to (v, v)
             # update will be called when setting the extents
             self._visible = False
-            self.extents = v, v
+            self._set_extents((v, v))
             # We need to set the visibility back, so the span selector will be
             # drawn when necessary (span width > 0)
             self._visible = True
@@ -2797,7 +2797,7 @@ def _onmove(self, event):
             if vmin > vmax:
                 vmin, vmax = vmax, vmin
 
-        self.extents = vmin, vmax
+        self._set_extents((vmin, vmax))
 
         if self.onmove_callback is not None:
             self.onmove_callback(vmin, vmax)
@@ -2866,6 +2866,10 @@ def extents(self):
 
     @extents.setter
     def extents(self, extents):
+        self._set_extents(extents)
+        self._selection_completed = True
+
+    def _set_extents(self, extents):
         # Update displayed shape
         if self.snap_values is not None:
             extents = tuple(self._snap(extents, self.snap_values))