ltk-user December 2008

ltk-user@common-lisp.net

6 participants
4 discussions

[ltk-user] Displaying mouse pointer coordinates
by christopher melen 01 Jan '09

01 Jan '09

Hi, I'm trying to display the coordinates of the mouse pointer. My app consists of a canvas and a 'statusbar', both of which are contained in a toplevel. The statusbar (which is just a frame containing another canvas) contains text displaying the current position of the mouse pointer, and this is updated as the pointer moves. What I'm doing is deleting and then recreating the text with the new coordinates, but this results in an unpleasant 'flashing' effect (not so bad on WinXP but terrible on OS X). Is there a more efficient way of doing this? I know there are Tk-based apps which achieve this effect (such as Wavesurfer), so it must be do-able. This is the relevant event handler code - (bind *canvas* "<Motion>" (lambda (evt) (let* ((x (event-x evt)) (y (event-y evt))) (setf *x-coord* x *y-coord* y) (itemdelete *statusbar* *coord-display*) (make-coord-display)))) *canvas* is the main canvas, and *statusbar* the statusbar. *x-coord* and *y-coord* are bound to the current pointer coordinates, which are used by the statusbar's text item (bound to *coord-display*). The function MAKE-COORD-DISPLAY then recreates the text on the statusbar immediately after it has been deleted (hence the flashing). Many thanks in advance for any suggestions. Chris P.S: Also a strange thing happens if I use the above code for a canvas owned by a paned-window - the sash disappears. Odd...

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[ltk-user] reader error using menus on OS X
by Phil Armitage 27 Dec '08

27 Dec '08

Hi, I've been having a problem on OS X whereby selecting menu options (either top level menus or pop-up menus) would throw random, but very regular, reader errors "comma not inside a backquote". At first I thought this was just my code but having ran (ltk:ltktest), I can verify that the same problem occurs here too. My system is OS X 10.5.6 and the error can be triggered in both SBCL 1.0.23 and CCL 1.2. The error does not seem to occur on any Linux or Windows box I've tested on. Note that to recreate the problem it may be necessary to select menu options several times. For example, I just ran LTKTEST and generated the error on the first click of File->Load. Running a second time it took 15 attempts before it triggered again. Unfortunately my users are managing to trigger the error quite regularly! My attempts at tracking this down have been rather useless...has anyone else worked out hot to fix the problem? Many thanks, -- Phil Armitage http://phil.nullable.eu/

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[ltk-user] ltk spanish tutorial
by Felip Alàez Nadal 19 Dec '08

19 Dec '08

Hello Peter: I've been writting a little spanish ltk tutorial in my blog http://lispinspain.blogspot.com . At the moment I've written 3 posts about It and It seems usable for the people. Maybe It could be useful for somebody in the list to know It. Thanks. -- Felip Alàez Nadal

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[ltk-user] Setting wm-title
by Jud Leonard 19 Dec '08

19 Dec '08

I've been having trouble setting the window title using wm-title, apparently because ltk was never creating "." as the widget path. I patched it as follows: (defmethod wm-title ((w widget) title) (format-wish "wm title ~a {~a}" (if (master w) (widget-path w) ".") title) w) which seems to work. It wasn't clear to me whether this is the right fix if one has multiple top level windows, and I didn't know whether a similar fix should be applied to other wm- functions. Can you advise? Jud

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ltk-user December 2008