Book Image

Tcl/Tk 8.5 Programming Cookbook

Book Image

Tcl/Tk 8.5 Programming Cookbook

Overview of this book

With Tcl/Tk, you can create full-featured cross-platform applications in a simple and easy-to-understand way without any expensive development package; the only tools required are a simple text editor and your imagination. This practical cookbook will help you to efficiently interact with editors, debuggers, and shell type interactive programs using Tcl/Tk 8. This cookbook will comprehensively guide you through practical implementation of Tcl/Tk 8.5 commands and tools. This book will take you through all the steps needed to become a productive programmer in Tcl/Tk 8. Right from guiding you through the basics to creating a stand-alone application, it provides complete explanation of all the steps along with handy tips and tricks. The book begins with an introduction to the Tcl shell, syntax, variables, and programming best practices in the language. It then explores procedures and the flow of events with control constructs followed by advanced error trapping and recovery. From Chapter 4, a detailed study of string expressions and handling enables you to handle various string functions and use lists to expand the string functionality. The book then discusses in-depth the Tcl Dictionary and how to utilize it to store and retrieve data. File operations and Tk GUI handling are covered extensively along with a developing a real-world address book application to practice the concepts learned.
Table of Contents (20 chapters)
Tcl/Tk 8.5 Programming Cookbook
About the Author
About the Reviewers

Creating a menu

In Tk the menu is not just a name for a part of your GUI, but also the actual widget command name as well. The menu command will create a new menu widget.

The syntax is as follows:

menu name option value…

The menu command accepts one or more option value pairs, as detailed in the following table:




Specifies an accelerator or keyboard hotkeys to be displayed to the right-hand side of the menu text. The specific acceptable values are dependent on the display manager in use. For example, in a Windows application, Control+N would be an acceptable value.


Specifies the background color to be used when drawing the element. The active background is the color used when the mouse is over the element and when pressing the mouse button will initiate an action.


Specifies the width of the 3D border to draw around the active item.


Specifies the foreground color to be used when drawing...