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nik90
Asked: 2013-02-07 09:24:42 +0800 CST

Highlighting Gtk Entry fields on invalid input by user

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I am creating a program using Python and Gtk. I want to guide the user by pointing out mistakes if any. I have attached a sample glade interface below. Here the user is supposed to enter a valid station name in the GtkEntry field. I want to highlight this field with red color (for instance) if he presses the submit button.

enter image description here

How do I achieve this in GTK3 with Python?

application-development

1 Answers

  1. Best Answer

    First, you will need the Color class from Gdk and the Gtk class:

    from gi.repository import Gtk
from gi.repository.Gdk import Color

    Then, in your handler, change the foreground color of the text field:

    COLOR_INVALID = Color(50000, 0, 0) // A dark red color
text_field.modify_fg(Gtk.StateFlags.NORMAL, COLOR_INVALID)

    If you want to change the color back to the default when the text field is modified, put this in the change handler:

    text_field.modify_fg(Gtk.StateFlags.NORMAL, None)

    The RBG values for the Color class are in a range from 0-65535.

    For more information, see the PyGTK documentation, specifically the Widget and Color classes.

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