This code is based on the Tcl
ttkscale.tcl demo. It displays a horizontal scale and a label, the text of the label changes as the scale is moved.
# File: scale.py
# http://www.tcl.tk/man/tcl8.5/TkCmd/ttk_scale.htm
from tkinter import *
from tkinter import ttk
from demopanels import MsgPanel, SeeDismissPanel
class ScaleDemo(ttk.Frame):
def __init__(self, isapp=True, name='scaledemo'):
ttk.Frame.__init__(self, name=name)
self.pack(expand=Y, fill=BOTH)
self.master.title('Scale Demo')
self.isapp = isapp
self._create_widgets()
def _create_widgets(self):
if self.isapp:
MsgPanel(self,
["A label tied to a horizontal scale is displayed below. ",
"If you click or drag mouse button 1 in the scale, you ",
"can change the contents of the label; a callback command ",
"is used to couple the slider to both the text and the ",
"coloring of the label."])
SeeDismissPanel(self)
self._create_demo_panel()
def _create_demo_panel(self):
demoPanel = ttk.Frame(self, borderwidth=10)
demoPanel.pack(side=TOP, fill=X, expand=Y)
self.colorList = ['Red', 'Orange', 'Yellow', 'Green', 'Blue', 'Violet']
self.lbl = ttk.Label()
self.scale = ttk.Scale(from_=0, to=5, command=self._scale_update)
self.lbl.pack(in_=demoPanel)
self.scale.pack(in_=demoPanel)
self.scale.set(0)
def _scale_update(self, evt):
idx = int(float(evt))
color = self.colorList[idx]
self.lbl.configure(foreground=color,
text='Color: {}'.format(color))
if __name__ == '__main__':
ScaleDemo().mainloop()
