added wx debug mode (enable by setting WXDEBUG env var)

slic/__init__.py

@@ -1,3 +1,6 @@
+from slic.gui.wxdebug import wxdebug as _wxdebug
+_wxdebug()
+
 
 from . import core
 

slic/gui/wxdebug.py

@@ -0,0 +1,31 @@
+import os
+from random import randint
+
+import wx
+
+
+original_add = wx.Sizer.Add
+
+
+def wxdebug():
+    if "WXDEBUG" in os.environ:
+        wx.Sizer.Add = debug_add
+
+
+def debug_add(self, item, *args, **kwargs):
+    try:
+        item.SetBackgroundColour(random_color())
+    except:
+        pass
+    return original_add(self, item, *args, **kwargs)
+
+
+def random_color():
+    return wx.Colour(
+        randint(100, 255),
+        randint(100, 255),
+        randint(100, 255)
+    )
+
+
+