ltk-user October 2006

ltk-user@common-lisp.net

4 participants
4 discussions

[ltk-user] Beginners question
by Nicolas Neuss 27 Oct '06

27 Oct '06

Hello LTK users, As a complete GUI programming newbie I wanted to try LTK, but immediately have several questions: 1. Are there any example programs using LTK? 2. I don't know anything about Tk, unfortunately. Is there some tutorial to GUI programming with Tk? 3. My current goal is to have a small window which displays a new random number whenever I press a button. I thought about using message/textvariable in the following code snippet: (defun zufallszahl () (with-ltk () (let* ((x "0") (f (make-instance 'frame)) (text (make-instance 'message :text x :width 100)) (button (make-instance 'button :master f :text "Next" :command (lambda () (setq x (format nil "~D" (random 10))))))) (pack f) (pack text :side :top) (pack button :side :bottom) (configure f :borderwidth 3) (configure f :relief :sunken) ))) Unfortunately, (make-instance 'message :textvariable x :width 100) does not work. Is this a bug? 4. How can I put the message above the button? I tried several combinations of :side XXX, none did achieve it. 5. How can I change the text of the message into something larger? Thank you very much for any hints, Nicolas

2 1

[ltk-user] Re: Re: how to save a canvas to an image?
by Peter Herth 17 Oct '06

17 Oct '06

It would be interesting to see an example of the artifacts. Generally, when you try to convert postscript to pixel data, you have to specify the resolution to use, the higher the resolution, the better the output image. I suspect that by default 72 dpi is used which is not very satisfactory. Try rather to use 300 dpi. Peter

1 0

[ltk-user] Option Menus (contrib)
by Madhu 15 Oct '06

15 Oct '06

Helu, I have often found myself in need of an option menu or combo box in LTK. However at present LTK supports only one type of (cascade) menu. Although ltk.lisp (0.90 at the time of writing) defines unused *class-args* via defargs for menubutton and menu, the classes menubutton and menu do not support the various interactions that Tk allows between its (Tk's) "menubuttons" and "menus". It is not clear what the thinking of the author is on supporting other interactions in the future. Code adding such functionality depends on LTK's internals and is therefore liable to break. I am attaching a file which adds support for the tk_optionsMenu command via a new function TK-OPTION-MENU and a new LTK widget called OPTIONSMENU. This turns out to fit (nicely) with the LTK model of menus and I would request considering it for inclusion in an appropriate form into LTK. Especially as it depends on LTK's clos protocols. Most of the file is comments and example code, I took the liberty of copying the licensing from ltk-mw and hope it is suitable. Feedback welcome. -- Best Regards Madhu

1 0

[ltk-user] Re: how to save a canvas to an image?
by Peter Herth 13 Oct '06

13 Oct '06

Try the postscript function, which saves the content of the canvas into a file. That has the advantage you get a fully vectorized form of your diagram. Peter

1 0

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

ltk-user October 2006