Read e-book online Learning Perl/Tk: Graphical User Interfaces with Perl PDF

By Nancy Walsh

ISBN-10: 1565923146

ISBN-13: 9781565923140

ISBN-10: 1565929594

ISBN-13: 9781565929593

Studying Perl/Tk is an instructional for Perl/Tk, the extension to Perl for developing graphical person interfaces. With Tk, Perl courses could be window-based instead of command-line established, with buttons, access fields, listboxes, menus, and scrollbars. initially constructed for the Tcl language, the Perl port of the Tk toolkit liberates Perl programmers from the realm of command-line techniques, STDIN, and STDOUT, permitting them to construct graphical, event-driven purposes for either home windows and UNIX.This e-book is aimed toward Perl newbies and specialists alike. It explains the reasoning in the back of event-driven functions and drills in directions on find out how to most sensible layout graphical functions. It teaches how you can enforce and configure all of the Perl/Tk graphical components step by step. detailed awareness is given to the geometry managers, that are had to place every one button, menu, label and listbox within the window frame.Although this e-book doesn't train simple Perl, somebody who has written even the easiest Perl software will be in a position to research Tk from this publication. The writing is breezy and casual, and will get correct to the purpose of what you must comprehend and why. The publication is rife with illustrations that show how every one point is drawn and the way its configuration ideas have an effect on its presentation.

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Extra resources for Learning Perl/Tk: Graphical User Interfaces with Perl

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By default, pack() places the widgets against the top of the toplevel or frame. You can control what side a widget is placed against by using the -side option: -side => 'left' | 'right' | 'top' | 'bottom' For example, if we would like our button against the left edge of the window, we can specify -side => 'left'. Using our Hello World example as a base, let's look at what happens when we pack our button against the different sides. The only line we will change is the ->pack part of the Button creation line.

Four buttons packed in order of top, right, bottom, and left A common use of -fill is on widgets with scrollbars: listbox, canvas, and text. Usually, the scrollbars are along the edge of the window, and you want the listbox to fill the remaining area. See Chapter 6, Scrollbars, and Chapter 7, The Listbox Widget, for more information. Expanding the Allocation Rectangle The -expand option manipulates the allocation rectangle and not the widget inside it. The value associated with -expand is a boolean value.

Subsequent presses of the Enlarge button will do nothing more to the window because all the widgets already have an -ipadx and -ipady of 20. If we wanted to always add 20 to the values of -ipadx and -ipady, we would have to request the current values and add 20 to them. Here's the code for that: sub repack_kids { my @kids = $mw->packSlaves; foreach (@kids) { %packinfo = $_->packInfo (); $_->pack(-ipadx => 20 + $packinfo{"-ipadx"}, -ipady => 20 + $packinfo{"-ipady"}) } } We use packInfo to get the current configuration and add 20 to that value.

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Learning Perl/Tk: Graphical User Interfaces with Perl by Nancy Walsh


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