How do I get mouse position relative to the parent widget in tkinter?

Question

I need to get the mouse position relative to the tkinter window.

Answer 1

Get the screen coordinates of the mouse move event (x/y_root) and subtract the screen coordinates of the window (window.winfo_rootx()/y()).

Answer 2

Generally speaking you should never need to "get" this information. You probably only need this information when responding to an event, and the event gives you this information.

Here's an example:

import Tkinter

class App:
    def __init__(self, root):
        f = Tkinter.Frame(width=100, height=100, background="bisque")
        f.pack(padx=100, pady=100)
        f.bind("<1>", self.OnMouseDown)

    def OnMouseDown(self, event):
        print "frame coordinates: %s/%s" % (event.x, event.y)
        print "root coordinates: %s/%s" % (event.x_root, event.y_root)

root=Tkinter.Tk()
app = App(root)
root.mainloop()