Mercurial > sdl-ios-xcode

view docs/index.html @ 1212:7663bb0f52c7

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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 74212992fb08
children 14717b52abc0
line wrap: on
line source

<!DOCTYPE HTML PUBLIC "-//Norman Walsh//DTD DocBook HTML 1.0//EN">
<HTML
><HEAD
><TITLE
>Introduction</TITLE
>
</HEAD
><BODY
BGCOLOR="#FFF8DC"
TEXT="#000000"
LINK="#0000ee"
VLINK="#551a8b"
ALINK="#ff0000"
><DIV
CLASS="NAVHEADER"
>
<HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="PREFACE"
><H1
><A
NAME="AEN8"
>Introduction</A
></H1
><P
>This library is designed to make it easy to write games that run on Linux,
Win32 and BeOS using the various native high-performance media interfaces,
(for video, audio, etc) and presenting a single source-code level API to
your application.  This is a fairly low level API, but using this, completely
portable applications can be written with a great deal of flexibility.</P
><P
>The library is loaded as a dynamically linked library on its native
platform, and is currently compiled natively for Linux, compiled for
Win32 using a Linux hosted GCC
<A
HREF="http://www.libsdl.org/Xmingw32/"
TARGET="_top"
>cross-compilation</A
>
environment, and compiled using the EGCS C++ compiler under BeOS.</P
><P
>An introduction to SDL can be found online at:
<A
HREF="http://www.libsdl.org/intro/toc.html"
TARGET="_top"
>http://www.libsdl.org/intro/</A
>&#13;</P
><P
>There are code examples on each of the main library pages, and there are
fully fleshed example C++ classes and programs in the examples archive,
available on the
<A
HREF="http://www.libsdl.org/download.html"
TARGET="_top"
>SDL download page</A
>.</P
><P
>For an introduction to basic multi-media programming concepts, you might try
some of the following links:
<P
></P
><UL
><LI
><P
><A
HREF="http://www.ziron.com/links/"
TARGET="_top"
>Game Programming Links</A
></P
></LI
><LI
><P
><A
HREF="http://developer.dungeon-crawl.com/"
TARGET="_top"
>Game Developer Search Engine</A
></P
></LI
></UL
></P
><P
>Enjoy!</P
><P
>&nbsp;&nbsp;&nbsp; Sam Lantinga
<TT
CLASS="EMAIL"
>&#60;<A
HREF="mailto:slouken@libsdl.org"
><A
HREF="mailto:slouken@libsdl.org"
TARGET="_top"
>slouken@libsdl.org</A
></A
>&#62;</TT
></P
>
<P>
<br><br><HR>
<H1>Table of Contents</H1>
<UL>
<LI><A HREF="html/index.html">Full Table of Contents</A></LI>
<LI><A HREF="html/guide.html">The SDL Guide</A></LI>
<LI><A HREF="html/reference.html">The SDL Reference</A></LI>
<UL>
<LI><A HREF="html/general.html">Initialization</A></LI>
<LI><A HREF="html/video.html">Video</A></LI>
<LI><A HREF="html/wm.html">Window Manager</A></LI>
<LI><A HREF="html/event.html">Event Handling</A></LI>
<LI><A HREF="html/joystick.html">Joystick</A></LI>
<LI><A HREF="html/audio.html">Audio</A></LI>
<LI><A HREF="html/cdrom.html">CDROM</A></LI>
<LI><A HREF="html/thread.html">Threads</A></LI>
<LI><A HREF="html/time.html">Timers</A></LI>
</UL>
</UL>
</DIV
></BODY
></HTML
>