Book Image

Tkinter GUI Application Development Blueprints - Second Edition

By : Bhaskar Chaudhary
Book Image

Tkinter GUI Application Development Blueprints - Second Edition

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, audio player, drawing application, piano tutor, chat application, screen saver, port scanner, and much 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, asyncio based programming 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 (12 chapters)

Implementing the Find Text feature

Next, let's code the Find Text feature (2.05.py). The following screenshot shows an example of the Find Text feature:

Here's a quick summary of the desired functionality. When a user clicks on the Find menu item, a new Toplevel window opens up. The user enters a search keyword and specifies whether the search needs to be case-sensitive. When the user clicks on the Find All button, all matches are highlighted.

To search through the document, we rely on the text_widget.search() method. The search method takes in the following arguments:

search(pattern, startindex, stopindex=None, forwards=None, backwards=None, exact=None, regexp=None, nocase=None, count=None)

For the editor, define a function called find_text and attach it as a callback to the Find menu (2.05.py):

edit_menu.add_command(label='Find',underline= 0, accelerator...