Canvas not binding to mouse button within a class, tkinter-Python3

Question

I have been trying to bind a canvas to mouse click as described in this answer but within a class. The callback function is not getting invoked though. All related questions here seem to be calling the callback() function while trying to bind, rather than referencing it. I am referencing it, but it still doesn't work.

from tkinter import *

class BindingTrial():
    def __init__(self,root,canvas):
        self.root = root
        self.canvas = canvas
        self.canvas.bind("Button-1",self.callback)

    def callback(self,event):
        print ("clicked at", event.x, event.y)

root = Tk()
canvas= Canvas(root, width=100, height=100)
bt = BindingTrial(root,canvas)
canvas.pack()
root.mainloop()

Bryan Oakley · Accepted Answer · 2019-12-03 14:03:45Z

2

You need to call the button bind with "<Button-1>", and the callback should accept self as the first parameter.

class BindingTrial():
    def __init__(self,root,canvas):
        self.root = root
        self.canvas = canvas
        self.canvas.bind('<Button-1>',self.callback)

    def callback(self, event):
        print ("clicked at", event.x, event.y)

edited Dec 3, 2019 at 14:03

Bryan Oakley

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answered Dec 3, 2019 at 13:06

stevers

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