Mercurial > sdl-ios-xcode
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To: sdl@libsdl.org
From: Christian Walther <cwalther@gmx.ch>
Date: Thu, 15 Dec 2005 21:19:53 +0100
Subject: [SDL] More mouse enhancements for Mac OS X
The attached patch brings two more enhancements to mouse handling on Mac
OS X (Quartz):
1. Currently, after launching an SDL application, SDL's notion of the
mouse position is stuck in the top left corner (0,0) until the first
time the mouse is moved. That's because the UpdateMouse() function isn't
implemented in the Quartz driver. This patch adds it.
2. When grabbing input while the mouse cursor is hidden, the function
CGAssociateMouseAndMouseCursorPosition(0) is called, which prevents the
system's notion of the mouse location from moving (and therefore leaving
the SDL window) even when the mouse is moved. However, apparently the
Wacom tablet driver (and maybe other special pointing device drivers)
doesn't care about that setting and still allows the mouse location to
go outside of the window. Interestingly, the system cursor, which is
made visible by the existing code in SDL in that case, does not follow
the mouse location, but appears in the middle of the SDL window. The
mouse location being outside of the window however means that mouse
button events go to background applications (or the dock or whatever is
there), which is very confusing to the user who sees no cursor outside
of the SDL window.
I have not found any way of intercepting these events (and that's
probably by design, as "normal" applications shouldn't prevent the user
from bringing other applications' windows to the front by clicking on
them). An idea would be placing a fully transparent, screen-filling
window in front of everything, but I fear that this might affect
rendering performance (by doing unnecessary compositing, using up
memory, or whatever).
The deluxe solution to the problem would be talking to the tablet
driver using AppleEvents to tell it to constrain its mapped area to the
window (see Wacom's "TabletEventDemo" sample app,
http://www.wacomeng.com/devsupport/mac/downloads.html), but I think that
the bloat that solution would add to SDL would outweigh its usefulness.
What I did instead in my patch is reassociating mouse and cursor when
the mouse leaves the window while an invisible grab is in effect, and
restoring the grab when the window is entered. That way, the grab can
still be effectively broken by a tablet, but at least it's obvious to
the user that it is broken. That change is minimal - it doesn't affect
operation with a mouse (or a trackpad), and the code that it adds is not
executed on every PumpEvents() call, only when entering and leaving the
window.
Unless there are any concerns about the patch, please apply. Feel free
to shorten the lengthy comment in SDL_QuartzEvents.m if you think it's
too verbose.
Thanks
-Christian
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 02 Jan 2006 00:31:00 +0000 |
| parents | 85ba077211bc |
| children | c2c72a31f1bc |
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Simple DirectMedia Layer CREDITS Thanks to everyone who made this possible, including: * Cliff Matthews, for giving me a reason to start this project. :) -- Executor rocks! *grin* * Scott Call, for making a home for SDL on the 'Net... Thanks! :) * The Linux Fund, C Magazine, Educational Technology Resources Inc., Gareth Noyce, Jesse Pavel, Keith Kitchin, Jeremy Horvath, Thomas Nicholson, Hans-Peter Gygax, the Eternal Lands Development Team, Lars Brubaker, and Phoenix Kokido for financial contributions * Gaëtan de Menten for writing the PHP and SQL behind the SDL website * Tim Jones for the new look of the SDL website * Marco Kraus for setting up SDL merchandise * Martin Donlon for his work on the SDL Documentation Project * Ryan Gordon for helping everybody out and keeping the dream alive. :) * Mattias Engdegård, for help with the Solaris port and lots of other help * Max Watson, Matt Slot, and Kyle for help with the MacOS Classic port * Stan Shebs, for the initial MacOS X port * Max Horn and Darrell Walisser for unflagging work on the MacOS X port * Patrick Trainor, Jim Boucher, and Mike Gorchak for the QNX Neutrino port * Carsten Griwodz for the AIX port * Gabriele Greco, for the Amiga port * Patrice Mandin, for the Atari port * Hannu Viitala for the EPOC port * Peter Valchev for nagging me about the OpenBSD port until I got it right. :) * Kent B Mein, for a place to do the IRIX port * Ash, for a place to do the OSF/1 Alpha port * David Sowsy, for help with the BeOS port * Eugenia Loli, for endless work on porting SDL games to BeOS * Jon Taylor for the GGI front-end * Paulus Esterhazy, for the Visual C++ testing and libraries * Brenda Tantzen, for Metrowerks CodeWarrior on MacOS * Chris Nentwich, for the Hermes assembly blitters * Michael Vance and Jim Kutter for the X11 OpenGL support * Stephane Peter, for the AAlib front-end and multi-threaded timer idea. * Jon Atkins for SDL_image, SDL_mixer and SDL_net documentation * Peter Wiklund, for the 1998 winning SDL logo, and Arto Hamara, Steven Wong, and Kent Mein for other logo entries. * Arne Claus, for the 2004 winning SDL logo, and Shandy Brown, Jac, Alex Lyman, Mikkel Gjoel, #Guy, Jonas Hartmann, Daniel Liljeberg, Ronald Sowa, DocD, Pekka Jaervinen, Patrick Avella, Erkki Kontilla, Levon Gavalian, Hal Emerich, David Wiktorsson, S. Schury and F. Hufsky, Ciska de Ruyver, Shredweat, Tyler Montbriand, Martin Andersson, Merlyn Wysard, Fernando Ibanez, David Miller, Andre Bommele, lovesby.com, Francisco Camenforte Torres, and David Igreja for other logo entries. * Bob Pendleton and David Olofson for being long time contributors to the SDL mailing list. * Everybody at Loki Software, Inc. for their great contributions! And a big hand to everyone else who gave me appreciation, advice, and suggestions, especially the good folks on the SDL mailing list. THANKS! :) -- Sam Lantinga <slouken@libsdl.org>