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Tkinter 8.5 reference: a GUI for

Python

John W. Shipman

2013-12-31 17:59

Abstract

Describes the Tkinter widget set for constructing graphical user interfaces (GUIs) in the Python

programming language. Includes coverage of the ttk themed widgets.

This publication is available in Web form

and also as a PDF document

. Please forward any

comments to tcc-doc@nmt.edu.

Table of Contents

1. A cross-platform graphical user interface builder for Python ...................................................... 3

2. A minimal application .............................................................................................................. 4

3. Denitions .............................................................................................................................. 5

4. Layout management ................................................................................................................ 5

4.1. The .grid() method .................................................................................................... 6

4.2. Other grid management methods ................................................................................... 7

4.3. Conguring column and row sizes ................................................................................. 7

4.4. Making the root window resizeable ................................................................................ 8

5. Standard attributes .................................................................................................................. 9

5.1. Dimensions ................................................................................................................... 9

5.2. The coordinate system ................................................................................................. 10

5.3. Colors ......................................................................................................................... 10

5.4. Type fonts ................................................................................................................... 10

5.5. Anchors ...................................................................................................................... 12

5.6. Relief styles ................................................................................................................. 12

5.7. Bitmaps ....................................................................................................................... 12

5.8. Cursors ....................................................................................................................... 13

5.9. Images ........................................................................................................................ 14

5.10. Geometry strings ....................................................................................................... 15

5.11. Window names .......................................................................................................... 16

5.12. Cap and join styles ..................................................................................................... 16

5.13. Dash patterns ............................................................................................................ 17

5.14. Matching stipple patterns ........................................................................................... 17

6. Exception handling ................................................................................................................ 18

7. The Button widget ................................................................................................................ 18

8. The Canvas widget ................................................................................................................ 20

8.1. Canvas coordinates ..................................................................................................... 22

8.2. The Canvas display list ............................................................................................... 22

8.3. Canvas object IDs ....................................................................................................... 22

http://www.nmt.edu/tcc/help/pubs/tkinter/

http://www.nmt.edu/tcc/help/pubs/tkinter/tkinter.pdf

1Tkinter 8.5 referenceNew Mexico Tech Computer Center

8.4. Canvas tags ................................................................................................................ 22

8.5. Canvas tagOrId arguments ...................................................................................... 22

8.6. Methods on Canvas widgets ........................................................................................ 22

8.7. Canvas arc objects ...................................................................................................... 28

8.8. Canvas bitmap objects ................................................................................................ 29

8.9. Canvas image objects .................................................................................................. 30

8.10. Canvas line objects .................................................................................................... 30

8.11. Canvas oval objects ................................................................................................... 32

8.12. Canvas polygon objects ............................................................................................. 33

8.13. Canvas rectangle objects ............................................................................................ 35

8.14. Canvas text objects .................................................................................................... 37

8.15. Canvas window objects ............................................................................................. 38

9. The Checkbutton widget ...................................................................................................... 38

10. The Entry widget ................................................................................................................ 41

10.1. Scrolling an Entry widget ......................................................................................... 45

10.2. Adding validation to an Entry widget ........................................................................ 45

11. The Frame widget ................................................................................................................ 47

12. The Label widget ................................................................................................................ 48

13. The LabelFrame widget ...................................................................................................... 50

14. The Listbox widget ............................................................................................................ 52

14.1. Scrolling a Listbox widget ....................................................................................... 56

15. The Menu widget .................................................................................................................. 56

15.1. Menu item creation (coption) options ........................................................................ 59

15.2. Top-level menus ........................................................................................................ 60

16. The Menubutton widget ...................................................................................................... 61

17. The Message widget ............................................................................................................ 63

18. The OptionMenu widget ...................................................................................................... 64

19. The PanedWindow widget .................................................................................................... 65

19.1. PanedWindow child conguration options .................................................................. 67

20. The Radiobutton widget .................................................................................................... 68

21. The Scale widget ................................................................................................................ 71

22. The Scrollbar widget ........................................................................................................ 74

22.1. The Scrollbar command callback ............................................................................ 77

22.2. Connecting a Scrollbar to another widget ................................................................ 77

23. The Spinbox widget ............................................................................................................ 78

24. The Text widget .................................................................................................................. 82

24.1. Text widget indices ................................................................................................... 84

24.2. Text widget marks .................................................................................................... 86

24.3. Text widget images ................................................................................................... 86

24.4. Text widget windows ............................................................................................... 87

24.5. Text widget tags ....................................................................................................... 87

24.6. Setting tabs in a Text widget ...................................................................................... 87

24.7. The Text widget undo/redo stack .............................................................................. 88

24.8. Methods on Text widgets .......................................................................................... 88

25. Toplevel: Top-level window methods ................................................................................. 95

26. Universal widget methods .................................................................................................... 97

27. Standardizing appearance ................................................................................................... 105

27.1. How to name a widget class ...................................................................................... 106

27.2. How to name a widget instance ................................................................................. 107

27.3. Resource specication lines ....................................................................................... 107

27.4. Rules for resource matching ...................................................................................... 108

28. ttk: Themed widgets ........................................................................................................... 108

New Mexico Tech Computer CenterTkinter 8.5 reference2

28.1. Importing ttk ........................................................................................................... 109

28.2. The ttk widget set ..................................................................................................... 110

29. ttk.Button ........................................................................................................................ 110

30. ttk.Checkbutton .............................................................................................................. 112

31. ttk.Combobox .................................................................................................................... 115

32. ttk.Entry .......................................................................................................................... 116

33. ttk.Frame .......................................................................................................................... 118

34. ttk.Label .......................................................................................................................... 119

35. ttk.LabelFrame ................................................................................................................ 122

36. ttk.Menubutton ................................................................................................................ 124

37. ttk.Notebook .................................................................................................................... 126

37.1. Virtual events for the ttk.Notebook widget .............................................................. 128

38. ttk.PanedWindow .............................................................................................................. 129

39. ttk.Progressbar .............................................................................................................. 130

40. ttk.Radiobutton .............................................................................................................. 131

41. ttk.Scale .......................................................................................................................... 133

42. ttk.Scrollbar .................................................................................................................. 135

43. ttk.Separator .................................................................................................................. 137

44. ttk.Sizegrip .................................................................................................................... 137

45. ttk.Treeview .................................................................................................................... 137

45.1. Virtual events for the ttk.Treeview widget .............................................................. 145

46. Methods common to all ttk widgets ..................................................................................... 145

46.1. Specifying widget states in ttk ................................................................................... 146

47. Customizing and creating ttk themes and styles .................................................................... 146

48. Finding and using ttk themes ............................................................................................... 147

49. Using and customizing ttk styles .......................................................................................... 147

50. The ttk element layer ........................................................................................................... 149

50.1. ttk layouts: Structuring a style ................................................................................... 149

50.2. ttk style maps: dynamic appearance changes .............................................................. 151

51. Connecting your application logic to the widgets .................................................................. 153

52. Control variables: the values behind the widgets ................................................................... 153

53. Focus: routing keyboard input ............................................................................................. 155

53.1. Focus in ttk widgets .................................................................................................. 156

54. Events ................................................................................................................................ 157

54.1. Levels of binding ...................................................................................................... 157

54.2. Event sequences ....................................................................................................... 158

54.3. Event types .............................................................................................................. 158

54.4. Event modiers ........................................................................................................ 160

54.5. Key names ............................................................................................................... 160

54.6. Writing your handler: The Event class ...................................................................... 162

54.7. The extra arguments trick ......................................................................................... 164

54.8. Virtual events ........................................................................................................... 165

55. Pop-up dialogs ................................................................................................................... 165

55.1. The tkMessageBox dialogs module ......................................................................... 165

55.2. The tkFileDialog module ..................................................................................... 167

55.3. The tkColorChooser module ................................................................................. 168

1. A cross-platform graphical user interface builder for Python

Tkinter is a GUI (graphical user interface) widget set for Python. This document was written for Python

2.7 and Tkinter 8.5 running in the X Window system under Linux. Your version may vary.

3Tkinter 8.5 referenceNew Mexico Tech Computer Center

Pertinent references:

•

Fredrik Lundh, who wrote Tkinter, has two versions of his An Introduction to Tkinter: a more complete

1999 version

and a 2005 version

that presents a few newer features.

•

Python 2.7 quick reference

: general information about the Python language.

•

For an example of a sizeable working application (around 1000 lines of code), see huey: A color and

font selection tool

. The design of this application demonstrates how to build your own compound

widgets.

We'll start by looking at the visible part of Tkinter: creating the widgets and arranging them on the

screen. Later we will talk about how to connect the face—the “front panel”—of the application to the

logic behind it.

2. A minimal application

Here is a trivial Tkinter program containing only a Quit button:

#!/usr/bin/env python

import Tkinter as tk

class Application(tk.Frame):

def __init__(self, master=None):

tk.Frame.__init__(self, master)

self.grid()

self.createWidgets()

def createWidgets(self):

self.quitButton = tk.Button(self, text='Quit',

command=self.quit)

self.quitButton.grid()

app = Application()

app.master.title('Sample application')

app.mainloop()

This line makes the script self-executing, assuming that your system has Python correctly installed.

This line imports the Tkinter module into your program's namespace, but renames it as tk.

Your application class must inherit from Tkinter's Frame class.

Calls the constructor for the parent class, Frame.

Necessary to make the application actually appear on the screen.

Creates a button labeled “Quit”.

Places the button on the application.

The main program starts here by instantiating the Application class.

This method call sets the title of the window to “Sample application”.

Starts the application's main loop, waiting for mouse and keyboard events.

http://www.pythonware.com/library/tkinter/introduction/

http://ebot.org/tkinterbook/

http://www.nmt.edu/tcc/help/pubs/python/

http://www.nmt.edu/tcc/help/lang/python/examples/huey/

New Mexico Tech Computer CenterTkinter 8.5 reference4

3. Deﬁnitions

Before we proceed, let's dene some of the common terms.

window

This term has dierent meanings in dierent contexts, but in general it refers to a rectangular area

somewhere on your display screen.

top-level window

A window that exists independently on your screen. It will be decorated with the standard frame

and controls for your system's desktop manager. You can move it around on your desktop. You

can generally resize it, although your application can prevent this

widget

The generic term for any of the building blocks that make up an application in a graphical user in-

terface. Examples of widgets: buttons, radiobuttons, text elds, frames, and text labels.

frame

In Tkinter, the Frame widget is the basic unit of organization for complex layouts. A frame is a

rectangular area that can contain other widgets.

child, parent

When any widget is created, a parent-child relationship is created. For example, if you place a text

label inside a frame, the frame is the parent of the label.

4. Layout management

Later we will discuss the widgets, the building blocks of your GUI application. How do widgets get

arranged in a window?

Although there are three dierent “geometry managers” in Tkinter, the author strongly prefers the

.grid() geometry manager for pretty much everything. This manager treats every window or frame

as a table—a gridwork of rows and columns.

•

A cell is the area at the intersection of one row and one column.

• The width of each column is the width of the widest cell in that column.

• The height of each row is the height of the largest cell in that row.

• For widgets that do not ll the entire cell, you can specify what happens to the extra space. You can

either leave the extra space outside the widget, or stretch the widget to t it, in either the horizontal

or vertical dimension.

•

You can combine multiple cells into one larger area, a process called spanning.

When you create a widget, it does not appear until you register it with a geometry manager. Hence,

construction and placing of a widget is a two-step process that goes something like this:

self.thing = tk.Constructor(parent, ...)

self.thing.grid(...)

where Constructor is one of the widget classes like Button, Frame, and so on, and parent is the

parent widget in which this child widget is being constructed. All widgets have a .grid() method

that you can use to tell the geometry manager where to put it.

5Tkinter 8.5 referenceNew Mexico Tech Computer Center

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