feat(theme): add strip_switch_pad themeables and default

Author: has2k1

doc/_quartodoc.yml

@@ -520,6 +520,9 @@ quartodoc:
         - strip_background_x
         - strip_background_y
         - strip_placement
+        - strip_switch_pad
+        - strip_switch_pad_x
+        - strip_switch_pad_y
         - strip_text
         - strip_text_x
         - strip_text_x_bottom

plotnine/themes/theme.py

@@ -245,6 +245,9 @@ def __init__(
         strip_align_x=None,
         strip_align_y=None,
         strip_align=None,
+        strip_switch_pad_x=None,
+        strip_switch_pad_y=None,
+        strip_switch_pad=None,
         strip_placement=None,
         svg_usefonts=None,
         **kwargs,

plotnine/themes/theme_gray.py

@@ -145,6 +145,7 @@ def __init__(self, base_size=11, base_family=None):
             plot_tag_location="margin",
             plot_tag_position="topleft",
             strip_align=0,
+            strip_switch_pad=base_size / 4,
             strip_placement="inside",
             strip_background=element_rect(color="none", fill="#D9D9D9"),
             strip_background_x=element_rect(width=1),

plotnine/themes/themeable.py

@@ -2865,6 +2865,45 @@ class strip_align(strip_align_x, strip_align_y):
     """
 
 
+class strip_switch_pad_x(themeable):
+    """
+    Space between an x-axis and a strip placed beyond it on the same side
+
+    Parameters
+    ----------
+    theme_element : float
+        Size in points. Only has an effect when
+        `strip_placement="outside"` and an axis shares the strip's
+        side (top or bottom).
+    """
+
+
+class strip_switch_pad_y(themeable):
+    """
+    Space between a y-axis and a strip placed beyond it on the same side
+
+    Parameters
+    ----------
+    theme_element : float
+        Size in points. Only has an effect when
+        `strip_placement="outside"` and an axis shares the strip's
+        side (left or right).
+    """
+
+
+class strip_switch_pad(strip_switch_pad_x, strip_switch_pad_y):
+    """
+    Space between an axis and a strip placed beyond it on the same side
+
+    Parameters
+    ----------
+    theme_element : float
+        Size in points. Only has an effect when
+        `strip_placement="outside"` and an axis shares the strip's
+        side.
+    """
+
+
 class strip_placement(themeable):
     """
     Where a facet strip sits relative to an axis on the same side