Raspberry Pi Forums

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import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk, GObject, Pango

GObject.threads_init()

class Handler:
	def __init__(self):
		self.builder = Gtk.Builder()
		self.builder.add_from_file("window.glade")
		self.builder.connect_signals(self)
		self.window = self.builder.get_object("window1")
		
		self.textbox_text = self.builder.get_object("textbox1")
		self.textbox_text.modify_font(Pango.FontDescription('LiberationMono Bold 10'))
		self.textbox_buffer = self.textbox_text.get_buffer()
		
		self.button = self.builder.get_object("button")
		self.button.modify_font(Pango.FontDescription('LiberationMono Bold 14'))
		self.button.modify_fg(Gtk.StateFlags.NORMAL, Gdk.color_parse("green"))
	
	# initial values
		self.T_ambient = 3
		self.T_rect = 543.3
		
		self.integer_id = GObject.timeout_add_seconds(1, self.display_values)	# timer in seconds
	
	# button control
	def button_toggled_cb(self, toggled):
		if self.button.get_active():
			self.button.modify_fg(Gtk.StateFlags.NORMAL, Gdk.color_parse("red"))
			self.button.set_label("On")
			self.brake_state = "on"
		else:
			self.button.modify_fg(Gtk.StateFlags.NORMAL, Gdk.color_parse("green"))
			self.button.set_label("Off")
			self.brake_state = "off"
		
	def onDeleteWindow(self, *args):
		Gtk.main_quit(*args)
			
	def display_values(self):
		self.T_ambient += 1.0
		string =  (u" ambient:   %6.2f\N{degree sign}C\n" % (self.T_ambient))
		string += (u" rectifier: %6.2f\N{degree sign}C\n" % (self.T_rect))
		
		self.print_stuff_onscreen(string)
		return True
	
	def print_stuff_onscreen(self, string):
		self.textbox_buffer.set_text(string)
		return
		
if __name__ == "__main__":
	try:
		app = Handler()
		app.window.show()
		Gtk.main()
	except:
		print("failed to run program.")
	finally:
		quit()

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<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.20.0 -->
<interface>
  <requires lib="gtk+" version="3.10"/>
  <object class="GtkWindow" id="window1">
    <property name="can_focus">False</property>
    <signal name="delete-event" handler="onDeleteWindow" swapped="no"/>
    <child>
      <object class="GtkGrid" id="grid1">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="margin_top">10</property>
        <property name="margin_bottom">10</property>
        <property name="row_spacing">3</property>
        <property name="column_spacing">6</property>
        <child>
          <object class="GtkScrolledWindow">
            <property name="width_request">200</property>
            <property name="height_request">50</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="window_placement">bottom-left</property>
            <property name="shadow_type">in</property>
            <child>
              <object class="GtkTextView" id="textbox1">
                <property name="visible">True</property>
                <property name="can_focus">False</property>
              </object>
            </child>
          </object>
          <packing>
            <property name="left_attach">0</property>
            <property name="top_attach">0</property>
          </packing>
        </child>
        <child>
          <object class="GtkToggleButton" id="button">
            <property name="label" translatable="yes">Off</property>
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="receives_default">True</property>
            <signal name="toggled" handler="button_toggled_cb" swapped="no"/>
          </object>
          <packing>
            <property name="left_attach">0</property>
            <property name="top_attach">1</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>

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/home/*username*/.config/gtk-3.0/gtk.css

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@define-color theme_base_color #ffffff;
@define-color theme_bg_color #edeceb;
@define-color theme_selected_bg_color #4d98f5;
@define-color theme_text_color #1a1a1a;
@define-color theme_fg_color #000000;
@define-color theme_selected_fg_color #ffffff;

* {
	font-family:	Piboto Light;
	font-size:	12pt;
	font-weight:	Normal;
	font-style:	Normal;
}

.scrollbar {
	-GtkScrollbar-has-forward-stepper: true;
	-GtkScrollbar-has-backward-stepper: true;
}