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Tkinter GUI Application Development Blueprints, Second Edition

You're reading from   Tkinter GUI Application Development Blueprints, Second Edition Build nine projects by working with widgets, geometry management, event handling, and more

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Product type Paperback
Published in Mar 2018
Publisher Packt
ISBN-13 9781788837460
Length 422 pages
Edition 2nd Edition
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Author (1):
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Bhaskar Chaudhary Bhaskar Chaudhary
Author Profile Icon Bhaskar Chaudhary
Bhaskar Chaudhary
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Table of Contents (12) Chapters Close

Preface 1. Meet Tkinter FREE CHAPTER 2. Making a Text Editor 3. Programmable Drum Machine 4. Game of Chess 5. Building an Audio Player 6. Paint Application 7. Piano Tutor 8. Fun with Canvas 9. Multiple Fun Projects 10. Miscellaneous Tips 11. Other Books You May Enjoy

Adding the cursor information bar

The cursor information bar is simply a small label at the bottom-right corner of the Text widget that displays the current position of the cursor, as shown in the following screenshot:

The user can choose to show/hide this info bar from the View menu (2.11.py).

Begin by creating a Label widget within the Text widget and pack it in the bottom-right corner, as follows:

cursor_info_bar = Label(content_text, text='Line: 1 | Column: 1')
cursor_info_bar.pack(expand=NO, fill=None, side=RIGHT, anchor='se')

In many ways, this is similar to displaying line numbers. Here, too, the positions must be calculated after every keystroke, after events such as cut, paste, undo, redo, new, and open, or activities that lead to a change in cursor positions. Because this too needs to be updated for all the changed content, for every keystroke, we...

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