How to bind callback functions globally to a widget type in tkinter?-CodePudding

I have summarized the script in such a way that it only shows what is necessary to show my problem. In short, I would like to globally bind the callback functions to all button type widgets in the app.

class Frame_1(Frame):
    def__init__(self,master, **kwargs):
        super().__init__(master, **kwargs)
        self.btn_0 = Button(self, text='Press 10')
        self.btn_0 .pack() #...

        # links that I would like to disappear 
        # and replace with a global link that only reaches button type widgets
        self.btn_0 .bind('<ButtonPress>', self.master.press)
        self.btn_0 .bind('<ButtonRelease>', self.master.release)


class Frame_2(Frame):
    def__init__(self,master, **kwargs):
        super().__init__(master, **kwargs)
        self.btn_0 = Button(self, text='Press 10')
        self.btn_0 .pack() #....
        self.btn_0 .bind('<ButtonPress>', self.master.press)
        self.btn_0 .bind('<ButtonRelease>', self.master.release)


class Controller(Frame):
    def__init__(self,master, **kwargs):
        super().__init__(master, **kwargs)
        self.frm1 = Frame_1(self, bg='blue')
        self.frm1 .pack()
        self.frm2 = Frame_2(self, bg='green')
        self.frm2 .pack()

    def press(self, e):
        print('press')
    def release(self, e):
        print('release')
        

root=Tk()
app=Controller(root)
app.pack()
root.mainloop()

CodePudding user response：

try it this way: you tried to call "self". At this point you need an object reference. But you didn't have that. Public objects can still be integrated into a class.

from tkinter import *


def press( event):
    print('press')

def release( event):
    print('release')


class Frame_1(Frame):
    def __init__(self, master, **kwargs):
        super().__init__(master, **kwargs)

        self.btn_0 = Button(self, text='Press 10')
        self.btn_0.pack()  # ...

        # links that I would like to disappear
        # and replace with a global link that only reaches button type widgets
        self.btn_0.bind('<ButtonPress>', press)
        self.btn_0.bind('<ButtonRelease>', release)


class Frame_2(Frame):
    def __init__(self, master, **kwargs):
        super().__init__(master, **kwargs)
        self.btn_0 = Button(self, text='Press 10')
        self.btn_0.pack()  # ....
        self.btn_0.bind('<ButtonPress>',  press)
        self.btn_0.bind('<ButtonRelease>', release)


class Controller(Frame):
    def __init__(self, master, **kwargs):
        super().__init__(master, **kwargs)
        global press, release
        self.frm1 = Frame_1(self, bg='blue')
        self.frm1.pack()
        self.frm2 = Frame_2(self, bg='green')
        self.frm2.pack()



root = Tk()
app = Controller(root)
app.pack()
root.mainloop()

CodePudding user response：

Tkinter provides a bind_class method that allows you to bind to a widget class rather than an individual widget. In your case, the class would be Button.

Your code might look something like this:

root=Tk()
app=Controller(root)

root.bind_class("Button", "<ButtonPress-1>", app.press)
root.bind_class("Button", "<ButtonRelease-1>", app.release)