Drag window handle for Tkinter?

Question

First of all, this is my current code, essential parts of it:

class WindowDraggable():        
    x = 1
    y = 1
    def __init__(self,label):
        label.bind('<ButtonPress-1>',self.StartMove);
        label.bind('<ButtonRelease-1>',self.StopMove);
        label.bind('<B1-Motion>',self.OnMotion);

    def StartMove(self,event):
        self.x = event.x
        self.y = event.y

    def StopMove(self,event):
        self.x = None
        self.y = None

    def OnMotion(self,event):
        deltaX = event.x - self.x
        deltaY = event.y - self.y
        self.x = root.winfo_x() + deltaX
        self.y = root.winfo_y() + deltaY
        root.geometry("+%sx+%s" % (self.x,self.y))

#root is my window:
root = Tk()

#This is how I assign the class to label
WindowDraggable(label)

#All imports
from Tkinter import *
from PIL import Image, ImageTk
import sys
import re

What I am trying to accomplish is; Make the window draggable by a handle, in this case label. I can't really describe how it behaves now, but it does move the window, simply not following the mouse.

Please bear with me as I am a total newcomer to Python. Any help is appreciated :) A rewrite of the class is okay, I know it's really badly written.

I need assisance in bringing this to life, which would basically mean a simplified example of a similar class, as it seems that my skills in Python are not extensive enough for it. — Martti Laine, Sep 17 '11 at 15:00
This code looks like it was copied from this answer: https://stackoverflow.com/a/4055612/7432 — Bryan Oakley, Dec 19 '17 at 13:46

score 2 · Answer 1 · answered Sep 17 '11 at 21:11

Here's a little example:

from Tkinter import *
root = Tk()

class WindowDraggable():

    def __init__(self, label):
        self.label = label
        label.bind('<ButtonPress-1>', self.StartMove)
        label.bind('<ButtonRelease-1>', self.StopMove)
        label.bind('<B1-Motion>', self.OnMotion)

    def StartMove(self, event):
        self.x = event.x
        self.y = event.y

    def StopMove(self, event):
        self.x = None
        self.y = None

    def OnMotion(self,event):
        x = (event.x_root - self.x - self.label.winfo_rootx() + self.label.winfo_rootx())
        y = (event.y_root - self.y - self.label.winfo_rooty() + self.label.winfo_rooty())
        root.geometry("+%s+%s" % (x, y))

label = Label(root, text='drag me')
WindowDraggable(label)
label.pack()
root.mainloop()

You had it almost right, but you have to compensate for the offset within the label itself. Note that my example does not compensate for the window border. You will have to use of specific tools to figure that out (so this example works perfectly when using overrideredirect(1).

My guess is you're coming from another programming language, so I'll give you some tips while I'm at it:

Python does not end statements with a ; (while valid syntax, there is no reason to do it).
Method names should either consistently look_like_this or lookLikeThis.
Variables do not need to be declared. If you want to create an instance variable do so in __init__ (and definitely not outside a method unless you want a class variable).

Drag window handle for Tkinter?

1 Answers1

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