Tk  Basics

• Widgets are frequently-used GUI elements:
  • Button, box, scrollbar, radiobutton, checkbutton, canvas, listbox, menu, etc.
  • Packaged into object methods

• Frame widgets are containers for other widgets
  • Like frames in HTML

    $menu_bar = $top->Frame();

• Button widgets are linked with a reference to a subroutine
  • Executed when the button is clicked

    $click_button = $menu_bar->Button(         -text => 'ClickMe',         -command => \&clicksub );

• Label widgets display text

  $text = $text_frame->Label(         -width => '35',         -height => '12',         -background => 'white' );

• Most widgets are configured at creation or with the configure method.

  $top->configure(-title => 'hello world app');

• All Perl/Tk scripts require a MainLoop():
  • Serves as an event manager
  • Dispatches keystrokes and mouseclicks to subroutines

[ ] [ Course Contents ] [ Home ] [ Curriculum ]

http://www.keller.com/perladv/4/tk.html
Updated Wednesday, 31-Oct-2001 14:22:39 CST

Copyright © 1999

Dan Keller Technical Services 4500 19th St., San Francisco California, USA 94114 tel: 415 / 861-4500