Exercises, examples and other material relating to training module P307. This topic is presented on public course Perl for Larger Projects
Tk provides a very powerful GUI (Graphic User Interface) to Perl. You can use it to build a window with buttons, text entry boxes, sliders and graphics, and then use that window to control and report on an application.
Related technical and longer articlesGraphic User Interfaces (GUIs)
|Articles and tips on this subject||updated|
|3009||Expect in Perl - a short explanation and a practical example |
Around 20% of delegates on our Tcl Courses are using Tcl because of the Expect package that extends it to "choreograph" interaction with other systems and processes, and yet the Expect module in Perl (Expect.pm) is decidedly niche and we cover it on our Perl for Larger Projects course only on request. ...
|599||Perl/Tk real time display|
It's a real pleasure to be having an opportunity at the tail end of this week to write some examples that are combining Perl, Tk, and OO techniques. This clock is generated on a canvas, and updates every second. It's generated in its own frame and schedules its own events, so you could easily use it ...
|1340||Tk locks up - 100% c.p.u. on a simple program (Tcl, Perl, Python)|
Fighting packs and grids - Tk under Tcl, Perl, Python
You'll use pack OR grid to place components into your frame in a Tcl/Tk application. You may use both pack and grid within the same program, but NOT within the same frame. If you do, not only will you be writing code that has no clear meaning, ...
|1310||Callbacks - a more complex code sandwich|
When you write a piece of code, you're normally putting the filling into the sandwich; there's a built-in program in your computer that controls the loading and running of the code thst you've written, and there is a whole library of standard pieces of code that you call to perform the low level operations. ...
|595||Add a friendly front end with Tk|
With a Tk Graphic User Interface, you can add a friendly look and feel to an application running on your workstation if it's written in Tcl (Tcl/Tk), Perl (Perl/Tk) or Python (TkInter).
Whichever language you build your GUI on to, you'll want to remember
1. Create your components (known as widgets) ...
|596||The magic of -textvariable|
If you're writing a GUI based application, you'll need to hold pertinent information in variables in your program, AND display that pertinent information to the user.
The obvious way of doing this is to provide code that updates the display as required - in the case of Tcl/Tk you might write
|738||(Perl) Callbacks - what are they?|
In most programming applications, you'll write code that calls system functions or subroutines - for example, you'll write a program that reads data from a file (via a system call), splits the data into an array (perhaps via a further system call), and prints it out (through system calls).
On a few ...
Examples from our training material
|bob|| An interactive application with a Tk GUI|
|bobbb|| An interactive application with a Tk GUI|
|ptkcl2.pl|| Clock using Perl/Tk|
|ptkclock.pl|| Simpler version of Perl/Tk clock|
|tk1|| A simple GUI with Perl/Tk|
|tk2|| Drawing graphics on a canvas with Perl/Tk|
|tk3|| An interactive application with a Tk GUI|
|tk3.pl|| A toggle button implemented in Perl/Tk|
|tk4.pl|| An interactive form on a grid (tk)|
|tk5.pl|| Tk demo - fill in form, moving graphic|
Some modules are available for download
as a sample of our material or under an Open Training Notes License
for free download from [here]
Topics covered in this module
What is Perl/Tk?
First Perl/Tk program.
Packing, events and graphics.
Assigning an action to a button.
Using Tk over a network.
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