Python Language tkinter Geometry Managers
Example
Tkinter has three mechanisms for geometry management: place, pack, and grid.
The place manager uses absolute pixel coordinates.
The pack manager places widgets into one of 4 sides. New widgets are placed next to existing widgets.
The grid manager places widgets into a grid similar to a dynamically resizing spreadsheet.
Place
The most common keyword arguments for widget.place are as follows:
x, the absolute x-coordinate of the widgety, the absolute y-coordinate of the widgetheight, the absolute height of the widgetwidth, the absolute width of the widget
A code example using place:
class PlaceExample(Frame):
def __init__(self,master):
Frame.__init__(self,master)
self.grid()
top_text=Label(master,text="This is on top at the origin")
#top_text.pack()
top_text.place(x=0,y=0,height=50,width=200)
bottom_right_text=Label(master,text="This is at position 200,400")
#top_text.pack()
bottom_right_text.place(x=200,y=400,height=50,width=200)
# Spawn Window
if __name__=="__main__":
root=Tk()
place_frame=PlaceExample(root)
place_frame.mainloop()
Pack
widget.pack can take the following keyword arguments:
expand, whether or not to fill space left by parentfill, whether to expand to fill all space (NONE (default), X, Y, or BOTH)side, the side to pack against (TOP (default), BOTTOM, LEFT, or RIGHT)
Grid
The most commonly used keyword arguments of widget.grid are as follows:
row, the row of the widget (default smallest unoccupied)rowspan, the number of colums a widget spans (default 1)column, the column of the widget (default 0)columnspan, the number of columns a widget spans (default 1)sticky, where to place widget if the grid cell is larger than it (combination of N,NE,E,SE,S,SW,W,NW)
The rows and columns are zero indexed. Rows increase going down, and columns increase going right.
A code example using grid:
from tkinter import *
class GridExample(Frame):
def __init__(self,master):
Frame.__init__(self,master)
self.grid()
top_text=Label(self,text="This text appears on top left")
top_text.grid() # Default position 0, 0
bottom_text=Label(self,text="This text appears on bottom left")
bottom_text.grid() # Default position 1, 0
right_text=Label(self,text="This text appears on the right and spans both rows",
wraplength=100)
# Position is 0,1
# Rowspan means actual position is [0-1],1
right_text.grid(row=0,column=1,rowspan=2)
# Spawn Window
if __name__=="__main__":
root=Tk()
grid_frame=GridExample(root)
grid_frame.mainloop()
Never mix pack and grid within the same frame! Doing so will lead to application deadlock!
