Implement PNG-support check in set_theme_advanced (#32)

TkinterEP · Jul 9, 2018 · 64dcf21 · 64dcf21
1 parent 86dc1d7
commit 64dcf21
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/ttkthemes/_widget.py b/ttkthemes/_widget.py
@@ -88,8 +88,11 @@ def set_theme_advanced(self, theme_name, brightness=1.0,
 
         Applies the given modifiers to the images of the theme given and
         then creates a theme from these new images with the name
-        'advanced' and then applies this theme.
+        'advanced' and then applies this theme. Is not available without
+        support for PNG-based themes, then raises RuntimeError.
         """
+        if not self.png_support:
+            raise RuntimeError("PNG-based themes are not supported in the environment")
         # Check if the theme is a pixmap theme
         if theme_name not in self.pixmap_themes:
             raise ValueError("Theme is not a valid pixmap theme")