Book Image

Tkinter GUI Programming by Example

Book Image

Tkinter GUI Programming by Example

Overview of this book

Tkinter is a modular, cross-platform application development toolkit for Python. When developing GUI-rich applications, the most important choices are which programming language(s) and which GUI framework to use. Python and Tkinter prove to be a great combination. This book will get you familiar with Tkinter by having you create fun and interactive projects. These projects have varying degrees of complexity. We'll start with a simple project, where you'll learn the fundamentals of GUI programming and the basics of working with a Tkinter application. After getting the basics right, we'll move on to creating a project of slightly increased complexity, such as a highly customizable Python editor. In the next project, we'll crank up the complexity level to create an instant messaging app. Toward the end, we'll discuss various ways of packaging our applications so that they can be shared and installed on other machines without the user having to learn how to install and run Python programs.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Events in our text editor


First things first: we should ensure that we have some expected key-bindings happening within our Text widget. We'll collate these in a method called bind_events and call this method from within our __init__:

def __init__(self):
    ...    
    self.bind_events()

def bind_events(self):
self.bind('<Control-a>', self.select_all)
self.bind('<Control-c>', self.copy)
self.bind('<Control-v>', self.paste)
self.bind('<Control-x>', self.cut)
self.bind('<Control-y>', self.redo)
self.bind('<Control-z>', self.undo)

This function now ensures that six commonly used keyboard shortcuts will perform their expected behaviors.

Since these behaviors are already handled by the Text widget (except for select_all), we only need to emit the relevant events in order to get them to function. The select_all  method is the only one we need to perform the logic for:

def cut(self, event=None):
self.event_generate("<<Cut>>")

def copy(self, event=None...