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Traps and Events
- To: info-mcl
- Subject: Traps and Events
- From: email@example.com (Charlene Bloch Abrams)
- Date: 17 Jun 92 14:54:09 GMT
- Newsgroups: comp.lang.lisp.mcl
- Organization: Washington University, St. Louis
I'm trying to do something which I thought would be very simple: write a
function that prints the local coordinates of the mouse position in the
window in which the mouse is clicked. If clicked on the desktop, or in a
scrollbar or titlebar, nothing happens, apart from normal event processing.
I know about *eventhook*, which I'm using to toggle my function, and I know
about *current-event* and I'm using #_findwindow to determine in which
window the mouse was clicked, and in which part of that window. The problem
is that #_findwindow returns a window pointer, and view-mouse-position
takes a window as an argument and I'm not quite sure how to handle this and
do it properly!
This is what I have (which is obviously wrong):
(defun mouse-coords (&aux thePart)
(if (equal (rref *current-event* :EventRecord.what)
(rlet ((whichWindow :integer))
(setq thePart (#_findwindow (rref *current-event* :EventRecord.where)
(if (equal thePart #$inContent)
(format t "Mouse at ~A~%"
(point-string (view-mouse-position whichWindow)))))))
Any and all help gratefully appreciated.