ltk-user

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259 discussions

[ltk-user] selected text
by Phil Armitage 15 Nov '06

15 Nov '06

Hi, I'm starting to use LTK but there's one feature I need and have been unable to find. Essentially I want to be able to retrieve the selected text in a text widget. I searched through the docs and source but couldn't find anything (I apologize if I've missed it). I'm very new to Lisp (and Tk!) but I managed to write this: (defmethod selected ((text text)) (format-wish "senddatastring [~a get sel.first sel.last]" (widget-path text)) (read-data)) ...which works but causes problems if no text is selected. Is there an obvious way around this (or, even better, an existing function to do the job that I've just missed)? Many thanks in advance for any help you can offer (and thanks to Peter for writing the library!). Phil

2 2

[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

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[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

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[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

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[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

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[ltk-user] UNICODE
by barthes jean-paul 27 Sep '06

27 Sep '06

Hello. We are currently developing multilingual ontologies for a European project called Terregov. The multilingual aspect of the project require a UTF-8 encoding. The CLISP environment can be set easily, however, when exchanging Polish strings with Tk, some characters trigger a hang up on the connection. In particular the "o" with acute accent seems to be one of the culprit. I assume that some of the UTF-8 codes are interpreted as control chars in the command string when sending or receiving strings between the Lisp and Tk environments. Is there an easy way out of this problem? Thank you. Prof. Jean-Paul Barthès UMR CNRS HEUDIASYC CS Department Université de Technologie de Compiègne 60205 Compiègne Cedex, France Tel +33 3 44 23 44 66 Fax +33 3 44 23 44 77 www.utc.fr/~barthes

2 1

[ltk-user] text widget, tk8.5
by Jan Rychter 18 Sep '06

18 Sep '06

I've just started playing with ltk -- it's nice! I have two questions. One -- it seems that support for text widget commands is very limited. Will anyone be working on that? (as an example, there is no "tag add", "tag delete", "tag remove", "tag lower", etc.). Two -- is tk8.5 support planned? I'm afraid I'll have to use 8.5 because of a much better text widget (cursor keys finally work as expected). I tried just running things with wish8.5, but there are errors. --J.

2 4

[ltk-user] Images
by Bill Ramsay 23 Aug '06

23 Aug '06

Hello, again After much confusion on my part, I am finally able to get images to work. Felip's latest code snippet works fine and I am able to use the same method in my own code. For some reason or other my old ppm images don't work. I think it has something to do with transparency, because if I make a new transparent image, it works. Anyway, that's a different problem. Thank you for all the help. Sorry it took so long to get me going.... Bill

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[ltk-user] Icons
by Bill Ramsay 20 Aug '06

20 Aug '06

I'm trying to add an image or icon to a menubutton (or regular button) and I don't quite get how it works. What does the first parameter of image-load represent (i.e. photo as in (image-load photo "x.ppm"))? Should I be working with bitmaps instead of images? How does the result of the load get assigned to the widget? And how does the :anchor or :justify get placed on the icon as opposed to the button text or the button itself? Is there an example of this anywhere? Thanks, Bill

3 5

[ltk-user] Apparent Bug
by Bill Ramsay 17 Aug '06

17 Aug '06

I seem to have found a bug in Ltk. If you set the genomety of the main window to x/y values of 0/0, the menus no longer work correctly. Firing the menu command button causes the menu to appear in a flash and fire the first menu item. You do not get to view the menu at all, let alone traverse it. Setting the geometry to 1/1 (or anything else) solves the problem. I seem to have a lot of questions getting started with Ltk. Sorry, but... How do you create a modal dialog box? I can do it by creating a toplevel window and positioning it where the dialog should go, but this solution is not modal. Do you have to use tk itself to do this, or is there something I'm missing in ltk.lisp. Thanks, Bill

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