1 files changed, 13 insertions, 0 deletions
diff --git a/stackrpms_tk_lib.py b/stackrpms_tk_lib.py
index a086344..e106aae 100755
--- a/stackrpms_tk_lib.py
+++ b/stackrpms_tk_lib.py
@@ -12,6 +12,7 @@
 #    https://coderslegacy.com/python/create-a-status-bar-in-tkinter/
 #    https://stackoverflow.com/questions/38329996/enable-mouse-wheel-in-spinbox-tk-python
 #    https://insolor.github.io/effbot-tkinterbook-archive/tkinter-events-and-bindings.htm
+#    https://stackoverflow.com/questions/27533244/how-to-make-a-flashing-text-box-in-tkinter/78277443#78277443
 # Improve:
 from tkinter import *
 from tkinter import Spinbox as tkSpinbox, Checkbutton as tkCheckbutton, Entry as tkEntry, Radiobutton as tkRadiobutton
@@ -440,3 +441,15 @@ class Radiobutton(tkRadiobutton):
          if i1 == self.__var.get():
             i.focus()
             break
+
+def flash_entry(this_entry, colorlist, ms = 1000):
+   """
+   Flash the offending entry box through the colorlist, one color every 'ms' milliseconds.
+   Example:
+      flash_entry(entry_that_was_invalid,["red","white"])
+   """
+   thiscolor = colorlist.pop(0)
+   this_entry.config(background = thiscolor)
+   if len(colorlist) > 0:
+      top = this_entry._nametowidget(this_entry.winfo_parent())
+      top.after(ms, lambda te=this_entry, c=colorlist, ms=ms: flash_entry(te,c,ms))