Issue #27117: Make colorizer htest and turtledemo work with dark theme.

Factor out code for configuring text widget colors to a new function.

Lib/idlelib/colorizer.py

@@ -2,6 +2,7 @@ import time
 import re
 import keyword
 import builtins
+from tkinter import TkVersion
 from idlelib.delegator import Delegator
 from idlelib.config import idleConf
 
@@ -32,6 +33,28 @@ def make_pat():
 prog = re.compile(make_pat(), re.S)
 idprog = re.compile(r"\s+(\w+)", re.S)
 
+def color_config(text):  # Called from htest, Editor, and Turtle Demo.
+    '''Set color opitons of Text widget.
+
+    Should be called whenever ColorDelegator is called.
+    '''
+    # Not automatic because ColorDelegator does not know 'text'.
+    theme = idleConf.CurrentTheme()
+    normal_colors = idleConf.GetHighlight(theme, 'normal')
+    cursor_color = idleConf.GetHighlight(theme, 'cursor', fgBg='fg')
+    select_colors = idleConf.GetHighlight(theme, 'hilite')
+    text.config(
+        foreground=normal_colors['foreground'],
+        background=normal_colors['background'],
+        insertbackground=cursor_color,
+        selectforeground=select_colors['foreground'],
+        selectbackground=select_colors['background'],
+        )
+    if TkVersion >= 8.5:
+        text.config(
+            inactiveselectbackground=select_colors['background'])
+
+
 class ColorDelegator(Delegator):
 
     def __init__(self):
@@ -233,6 +256,7 @@ class ColorDelegator(Delegator):
         for tag in self.tagdefs:
             self.tag_remove(tag, "1.0", "end")
 
+
 def _color_delegator(parent):  # htest #
     from tkinter import Toplevel, Text
     from idlelib.percolator import Percolator
@@ -247,6 +271,7 @@ def _color_delegator(parent):  # htest #
     text.insert("insert", source)
     text.focus_set()
 
+    color_config(text)
     p = Percolator(text)
     d = ColorDelegator()
     p.insertfilter(d)

Lib/idlelib/editor.py

@@ -90,7 +90,7 @@ helpDialog = HelpDialog()  # singleton instance, no longer used
 
 class EditorWindow(object):
     from idlelib.percolator import Percolator
-    from idlelib.colorizer import ColorDelegator
+    from idlelib.colorizer import ColorDelegator, color_config
     from idlelib.undo import UndoDelegator
     from idlelib.iomenu import IOBinding, filesystemencoding, encoding
     from idlelib import mainmenu
@@ -742,20 +742,7 @@ class EditorWindow(object):
         # Called from self.filename_change_hook and from configdialog.py
         self._rmcolorizer()
         self._addcolorizer()
-        theme = idleConf.CurrentTheme()
-        normal_colors = idleConf.GetHighlight(theme, 'normal')
-        cursor_color = idleConf.GetHighlight(theme, 'cursor', fgBg='fg')
-        select_colors = idleConf.GetHighlight(theme, 'hilite')
-        self.text.config(
-            foreground=normal_colors['foreground'],
-            background=normal_colors['background'],
-            insertbackground=cursor_color,
-            selectforeground=select_colors['foreground'],
-            selectbackground=select_colors['background'],
-            )
-        if TkVersion >= 8.5:
-            self.text.config(
-                inactiveselectbackground=select_colors['background'])
+        EditorWindow.color_config(self.text)
 
     IDENTCHARS = string.ascii_letters + string.digits + "_"
 

Lib/turtledemo/__main__.py

@@ -89,8 +89,8 @@ import sys
 import os
 
 from tkinter import *
+from idlelib.colorizer import ColorDelegator, color_config
 from idlelib.percolator import Percolator
-from idlelib.colorizer import ColorDelegator
 from idlelib.textview import view_text
 from turtledemo import __doc__ as about_turtledemo
 
@@ -123,6 +123,8 @@ help_entries = (  # (help_label,  help_doc)
     ('About turtle module', turtle.__doc__),
     )
 
+
+
 class DemoWindow(object):
 
     def __init__(self, filename=None):
@@ -203,6 +205,7 @@ class DemoWindow(object):
         self.text_frame = text_frame = Frame(root)
         self.text = text = Text(text_frame, name='text', padx=5,
                                 wrap='none', width=45)
+        color_config(text)
 
         self.vbar = vbar = Scrollbar(text_frame, name='vbar')
         vbar['command'] = text.yview