Binding one button to two events with Tkinter

Question

I am just getting started with programming and am making a Tic-Tac-Toe program. In my program I have a display function, which changes and makes sure what entered is valid, and a win checker. Is there a way that I can bind both of these functions to the enter key?

Something like:

RowEnt.bind("<Return>", display, checkWin)

Solution 1

you could nest both functions inside of another function :) for example:

def addone(num1):
    num1=int(num1)+1

def subtractone(num1):
    num1=int(num1)-1

def combine():
    addone(1)
    subtractone(1)

if you wanted to call both of them, you would simply use combine() as the function you call :)

Solution 2

The key is passing add="+" when you bind the handler. This tells the event dispatcher to add this handler to the handler list. Without this parameter, the new handler replaces the handler list.

try:
    import Tkinter as tkinter # for Python 2
except ImportError:
    import tkinter # for Python 3

def on_click_1(e):
    print("First handler fired")

def on_click_2(e):
    print("Second handler fired")

tk = tkinter.Tk()
myButton = tkinter.Button(tk, text="Click Me!")
myButton.pack()

# this first add is not required in this example, but it's good form.
myButton.bind("<Button>", on_click_1, add="+")

# this add IS required for on_click_1 to remain in the handler list
myButton.bind("<Button>", on_click_2, add="+")

tk.mainloop()

Solution 3

Here, only one function is called as a direct result of invoking the button (invoke_mybutton) and all it does is generates a virtual event <<MyButton-Command>>>. This virtual event can be named anything as long as the name is not being used by Tk already. Once that's in place, you can bind and unbind to <<MyButton-Command>>> using the add='+' option all day long and you'll get the benefits of keyboard bindings and such Bryan Oakley was referring to.

try:
    import Tkinter as tkinter # for Python 2
except ImportError:
    import tkinter # for Python 3

def invoke_mybutton():
    tk.eval("event generate " + str(myButton) + " <<MyButton-Command>>")

def command_1(e):
    print("first fired")

def command_2(e):
    print("second fired")

tk = tkinter.Tk()
myButton = tkinter.Button(tk, text="Click Me!", command=invoke_mybutton)
myButton.pack()
myButton.bind("<<MyButton-Command>>", command_1, add="+")
myButton.bind("<<MyButton-Command>>", command_2, add="+")
tk.mainloop()