How to center a window on the screen in Tkinter

Question

I m trying to center a tkinter window  I know I can programatically get the size of the window and the size of the screen and use that to set the geometry  but I m wondering if there s a simpler way to center the window on the screen

User · Answer

This works also in Python 3 x and centers the window on screen   from tkinter import    app   Tk   app eval  tk  PlaceWindow   center   app mainloop

User · Answer

This answer is better for understanding beginner     import tkinter as tk  win   tk Tk      Creating instance of Tk class win title  Centering windows   win resizable False  False     This code helps to disable windows from resizing  window height   500 window width   900  screen width   win winfo screenwidth   screen height   win winfo screenheight    x cordinate   int  screen width 2  -  window width 2   y cordinate   int  screen height 2  -  window height 2    win geometry    x          format window width  window height  x cordinate  y cordinate    win mainloop

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I have found a solution for the same question on this site  from tkinter import Tk from tkinter ttk import Label root   Tk   Label root  text  Hello world   pack      Apparently a common hack to get the window size  Temporarily hide the   window to avoid update idletasks   drawing the window in the wrong   position  root withdraw   root update idletasks      Update  requested size  from geometry manager  x    root winfo screenwidth   - root winfo reqwidth      2 y    root winfo screenheight   - root winfo reqheight      2 root geometry    d  d     x  y      This seems to draw the window frame immediately  so only call deiconify     after setting correct window position root deiconify   root mainloop     sure  I changed it correspondingly to my purposes  it works

User · Answer

Use   import tkinter as tk  if   name         main         root   tk Tk       root title  Centered         w   800     h   650      ws   root winfo screenwidth       hs   root winfo screenheight       x    ws 2  -  w 2      y    hs 2  -  h 2       root geometry   dx d  d  d     w  h  x  y        root mainloop

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You can try to use the methods winfo screenwidth and winfo screenheight  which return respectively the width and height  in pixels  of your Tk instance  window   and with some basic math you can center your window   import tkinter as tk from PyQt4 import QtGui      or PySide  def center toplevel       toplevel update idletasks          Tkinter way to find the screen resolution       screen width   toplevel winfo screenwidth         screen height   toplevel winfo screenheight          PyQt way to find the screen resolution     app   QtGui QApplication         screen width   app desktop   screenGeometry   width       screen height   app desktop   screenGeometry   height        size   tuple int    for   in toplevel geometry   split      0  split  x        x   screen width 2 - size 0  2     y   screen height 2 - size 1  2      toplevel geometry    d  d     x  y       toplevel title  Centered         if   name         main         root   tk Tk       root title  Not centered        win   tk Toplevel root      center win       root mainloop     I am calling update idletasks method before retrieving the width and the height of the window in order to ensure that the values returned are accurate   Tkinter doesn t see if there are 2 or more monitors extended horizontal or vertical  So  you  ll get the total resolution of all screens together and your window will end-up somewhere in the middle of the screens    PyQt from the other hand  doesn t see multi-monitors environment either  but it will get only the resolution of the Top-Left monitor  Imagine 4 monitors  2 up and 2 down making a square   So  it does the work by putting the window on center of that screen  If you don t want to use both  PyQt and Tkinter  maybe it would be better to go with PyQt from start

User · Answer

Tk provides a helper function that can do this as tk  PlaceWindow  but I don t believe it has been exposed as a wrapped method in Tkinter  You would center a widget using the following   from tkinter import    app   Tk   app eval  tk  PlaceWindow  s center    app winfo pathname app winfo id     app mainloop     This function should deal with multiple displays correctly as well  It also has options to center over another widget or relative to the pointer  used for placing popup menus   so that they don t fall off the screen

User · Answer

The simplest  but possibly inaccurate  method is to use tk  PlaceWindow  which takes the pathname of a toplevel window as an argument  The main window s pathname is   import tkinter  root   tkinter Tk   root eval  tk  PlaceWindow   center    second win   tkinter Toplevel root  root eval f tk  PlaceWindow  str second win   center    root mainloop     The problem Simple solutions ignore the outermost frame with the title bar and the menu bar  which leads to a slight offset from being truly centered  The solution import tkinter    Python 3  def center win        quot  quot  quot      centers a tkinter window      param win  the main window or Toplevel window to center      quot  quot  quot      win update idletasks       width   win winfo width       frm width   win winfo rootx   - win winfo x       win width   width   2   frm width     height   win winfo height       titlebar height   win winfo rooty   - win winfo y       win height   height   titlebar height   frm width     x   win winfo screenwidth      2 - win width    2     y   win winfo screenheight      2 - win height    2     win geometry    x          format width  height  x  y       win deiconify    if   name         main         root   tkinter Tk       root attributes  -alpha   0 0      menubar   tkinter Menu root      filemenu   tkinter Menu menubar  tearoff 0      filemenu add command label  quot Exit quot   command root destroy      menubar add cascade label  quot File quot   menu filemenu      root config menu menubar      frm   tkinter Frame root  bd 4  relief  raised       frm pack fill  x       lab   tkinter Label frm  text  Hello World    bd 4  relief  sunken       lab pack ipadx 4  padx 4  ipady 4  pady 4  fill  both       center root      root attributes  -alpha   1 0      root mainloop    With tkinter you always want to call the update idletasks   method directly before retrieving any geometry  to ensure that the values returned are accurate  There are four methods that allow us to determine the outer-frame s dimensions  winfo rootx   will give us the window s top left x coordinate  excluding the outer-frame  winfo x   will give us the outer-frame s top left x coordinate  Their difference is the outer-frame s width  frm width   win winfo rootx   - win winfo x   win width   win winfo width      2 frm width   The difference between winfo rooty   and winfo y   will be our title-bar   menu-bar s height  titlebar height   win winfo rooty   - win winfo y   win height   win winfo height      titlebar height   frm width   You set the window s dimensions and the location with the geometry method  The first half of the geometry string is the window s width and height excluding the outer-frame  and the second half is the outer-frame s top left x and y coordinates  win geometry f  width x height   x   y      You see the window move One way to prevent seeing the window move across the screen is to use  attributes  -alpha   0 0  to make the window fully transparent and then set it to 1 0 after the window has been centered  Using withdraw   or iconify   later followed by deiconify   doesn t seem to work well  for this purpose  on Windows 7  I use deiconify   as a trick to activate the window   Making it optional You might want to consider providing the user with an option to center the window  and not center by default  otherwise  your code can interfere with the window manager s functions  For example  xfwm4 has smart placement  which places windows side by side until the screen is full  It can also be set to center all windows  in which case you won t have the problem of seeing the window move  as addressed above    Multiple monitors If the multi-monitor scenario concerns you  then you can either look into the screeninfo project  or look into what you can accomplish with Qt  PySide2  or GTK  PyGObject   and then use one of those toolkits instead of tkinter  Combining GUI toolkits results in an unreasonably large dependency

User · Answer

CENTERING THE WINDOW IN PYTHON Tkinter This is the most easiest thing in tkinter because all we must know is the dimension of the window as well as the dimensions of the computer screen  I come up with the following code which can help someone somehow and i did add some comments so that they can follow up  code        create a window first     root   Tk         define window dimensions width and height     window width   800     window height   500       get the screen size of your computer  width and height using the root object as foolows      screen width   root winfo screenwidth       screen height   root winfo screenheight         Get the window position from the top dynamically as well as position from left or right as follows     position top   int screen height 2 -window height 2      position right   int screen width   2 - window width 2        this is the line that will center your window     root geometry f  window width x window height   position right   position top          initialise the window     root mainloop 0

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This method is cross-platform  works for multiple monitors screens  targets the active screen   and requires no other libraries than Tk  The root window will appear centered without any unwanted  quot flashing quot  or animations  import tkinter as tk  def get geometry frame       geometry   frame winfo geometry       match   re match r    d  x  d      d      d      geometry      return  int val  for val in match group  range 1  5     def center window root        quot  quot  quot Must be called after application is fully initialized     so that the root window is the true final size  quot  quot  quot        Avoid unwanted  quot flashing quot  by making window transparent until fully ready     root attributes  -alpha   0         Get dimensions of active screen monitor using fullscreen trick  withdraw       window before making it fullscreen to preserve previous dimensions     root withdraw       root attributes  -fullscreen   True      root update idletasks        screen width  screen height        get geometry root      root attributes  -fullscreen   False         Restore and get  quot natural quot  window dimensions     root deiconify       root update idletasks        window width  window height        get geometry root         Compute and set proper window center     pos x   round screen width   2 - window width   2      pos y   round screen height   2 - window height   2      root geometry f   pos x   pos y        root update idletasks            root attributes  -alpha   1     Usage  root   tk Tk   center window root   Note that at every point where window geometry is modified  update idletasks   must be called to force the operation to occur synchronously immediately  It uses Python 3 functionality but can easily be adapted to Python 2 x if necessary

User · Answer

I use frame and expand option  Very simple  I want some buttons in the middle of screen  Resize window and button stay in the middle  This is my solution   frame   Frame parent window  Button frame  text  button1   command command 1  pack fill X  Button frame  text  button2   command command 2  pack fill X  Button frame  text  button3   command command 3  pack fill X  frame pack anchor CENTER  expand 1

[python] How to center a window on the screen in Tkinter?

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