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- To: email@example.com
- Subject: Modal Dialogs
- From: Denis R Howlett <firstname.lastname@example.org>
- Date: Fri, 17 Jul 1992 13:02:13 -0400 (EDT)
I've been playing about with modal dialogs and I've found that calling
(modal-dialog win) is a bit too restrictive for what I need, here's why:
- When you call modal-dialog everything else is disabled - including
command-C, command-V etc., since these effect menu-clicks. This seems
to be different from normal Mac modal dialogs since the Edit menu
normally still works.
- If a function called by an action initiated from the modal dialog
(for example a button push) causes a window to close (any window)
this implicity causes a (return-from-modal-dialog :closed) which isn't
particularly convenient since the rest of the code doesn't get
executed (it must be some sort of throw).
- When the return-from-modal-dialog is called, the modal dialog is either
hidden or closed, but in certain circumstances I want it to stay up. (In
my application I have to make some of my windows temporarily modal to
stop the user clicking elsewhere. If you do a window-show it gives a
very annoying effect of windows going away and coming back.
Has anyone else suffered from this problem?
Has anyone got any solution?
I've written my own version of modal-dialog but it has a few flaws in it:
- First I found that I had to set ccl::*processing-events* to NIL for
it to work when called from inside my code (why NIL? I would have
- Preventing other windows from recieving events seems a question of
either writing my own event-handler and attaching it to *eventhook*
and checking each event to see if it is for a window other than mine
(I feel too old for that) or writing methods for each other window that
ignore view-click-events unless the window is the current modal one
(this is more do-able, but hardly elegant!)
- Preventing menus from getting clicks can be done by disabling them
- Implementing a throw mimics the rest of the behavior OK.
- I can't do anything about task switching, since it isn't really modal.
There must be a better way?
(I'm using 2.0b1p3 on a Mac IIcx)