Question

I am new to making GUIs with Python and what I am trying to do should be pretty simple. Essentially, I have a dialog class that I use to instantiate a dialog in my program. One of the things on this dialog is a button that I want to use to change color. I want the user to be able to click the button, be taken to a color chooser, then return to the dialog with the button changing to the color that was chosen. In my dialog class, here is where I define the button.

def body(self, master):

  Label(master, text="Track URL:").grid(row=0)
  Label(master, text="Short label:").grid(row=1)
  Label(master, text="Long label:").grid(row=2)
  b = Button(master, text="Color",bg="white",command=self.chooseColor).grid(row=3)

  self.e1 = Entry(master)
  self.e2 = Entry(master)
  self.e3 = Entry(master)

  self.e1.grid(row=0, column=1)
  self.e2.grid(row=1, column=1)
  self.e3.grid(row=2, column=1)

  return self.e1 # initial focus

Then I just want a simple function to choose the color

   def chooseColor(self):
   color = askColor()
   b["bg"] = color

I understand that b is now out of scope, so I can’t change it, but I don’t understand how to get the color chosen in a place where I can change the button color. Any help would be greatly appreciated.

Answer 1

Make b a member variable:

self.b = Button(.....)

Then self.chooseColor can “see” self.b and make changes to it:

def chooseColor(self):
    color = askColor()
    self.b["bg"] = color # or however you change a color in python/tkinter