Book Image

Tkinter GUI Application Development Blueprints

By : Bhaskar Chaudhary
Book Image

Tkinter GUI Application Development Blueprints

By: Bhaskar Chaudhary

Overview of this book

Tkinter is the built-in GUI package that comes with standard Python distributions. It is a cross-platform package, which means you build once and deploy everywhere. It is simple to use and intuitive in nature, making it suitable for programmers and non-programmers alike. This book will help you master the art of GUI programming. It delivers the bigger picture of GUI programming by building real-world, productive, and fun applications such as a text editor, drum machine, game of chess, media player, drawing application, chat application, screen saver, port scanner, and many more. In every project, you will build on the skills acquired in the previous project and gain more expertise. You will learn to write multithreaded programs, network programs, database driven programs and more. You will also get to know the modern best practices involved in writing GUI apps. With its rich source of sample code, you can build upon the knowledge gained with this book and use it in your own projects in the discipline of your choice.
Table of Contents (15 chapters)
Tkinter GUI Application Development Blueprints
About the Author
About the Reviewers

Implementing the Select All feature

We know that Tkinter has a built-in sel tag that applies a selection to a given text range. We want to apply this tag to the entire text in the widget.

We can simply define a function to handle this, as follows (refer to in the code bundle):

def select_all(event=None):
    content_text.tag_add('sel', '1.0', 'end')
    return "break"

After doing this, add a callback to the Select All menu item:

edit_menu.add_command(label='Select All', underline=7, accelerator='Ctrl+A', command=select_all)

We also need to bind the function to the Ctrl + A keyboard shortcut. We do this by using the following key bindings (refer to in the code bundle):

content_text.bind('<Control-A>', select_all)
content_text.bind('<Control-a>', select_all)

The coding of the Select All feature is complete. To try it out, add some text to the text widget and then click on the menu item, Select All or use the Ctrl + A (accelerator shortcut key).