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annotate docs/html/sdljoyaxisevent.html @ 1212:7663bb0f52c7
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> |
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date | Mon, 02 Jan 2006 00:31:00 +0000 |
parents | 355632dca928 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_JoyAxisEvent</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
0 | 8 "><LINK |
9 REL="HOME" | |
10 TITLE="SDL Library Documentation" | |
11 HREF="index.html"><LINK | |
12 REL="UP" | |
13 TITLE="SDL Event Structures." | |
14 HREF="eventstructures.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_MouseButtonEvent" | |
17 HREF="sdlmousebuttonevent.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_JoyButtonEvent" | |
20 HREF="sdljoybuttonevent.html"></HEAD | |
21 ><BODY | |
22 CLASS="REFENTRY" | |
23 BGCOLOR="#FFF8DC" | |
24 TEXT="#000000" | |
25 LINK="#0000ee" | |
26 VLINK="#551a8b" | |
27 ALINK="#ff0000" | |
28 ><DIV | |
29 CLASS="NAVHEADER" | |
30 ><TABLE | |
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31 SUMMARY="Header navigation table" |
0 | 32 WIDTH="100%" |
33 BORDER="0" | |
34 CELLPADDING="0" | |
35 CELLSPACING="0" | |
36 ><TR | |
37 ><TH | |
38 COLSPAN="3" | |
39 ALIGN="center" | |
40 >SDL Library Documentation</TH | |
41 ></TR | |
42 ><TR | |
43 ><TD | |
44 WIDTH="10%" | |
45 ALIGN="left" | |
46 VALIGN="bottom" | |
47 ><A | |
48 HREF="sdlmousebuttonevent.html" | |
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49 ACCESSKEY="P" |
0 | 50 >Prev</A |
51 ></TD | |
52 ><TD | |
53 WIDTH="80%" | |
54 ALIGN="center" | |
55 VALIGN="bottom" | |
56 ></TD | |
57 ><TD | |
58 WIDTH="10%" | |
59 ALIGN="right" | |
60 VALIGN="bottom" | |
61 ><A | |
62 HREF="sdljoybuttonevent.html" | |
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63 ACCESSKEY="N" |
0 | 64 >Next</A |
65 ></TD | |
66 ></TR | |
67 ></TABLE | |
68 ><HR | |
69 ALIGN="LEFT" | |
70 WIDTH="100%"></DIV | |
71 ><H1 | |
72 ><A | |
73 NAME="SDLJOYAXISEVENT" | |
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74 ></A |
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75 >SDL_JoyAxisEvent</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN4203" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_JoyAxisEvent -- Joystick axis motion event structure</DIV | |
84 ><DIV | |
85 CLASS="REFSECT1" | |
86 ><A | |
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87 NAME="AEN4206" |
0 | 88 ></A |
89 ><H2 | |
90 >Structure Definition</H2 | |
91 ><PRE | |
92 CLASS="PROGRAMLISTING" | |
93 >typedef struct{ | |
94 Uint8 type; | |
95 Uint8 which; | |
96 Uint8 axis; | |
97 Sint16 value; | |
98 } SDL_JoyAxisEvent;</PRE | |
99 ></DIV | |
100 ><DIV | |
101 CLASS="REFSECT1" | |
102 ><A | |
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103 NAME="AEN4209" |
0 | 104 ></A |
105 ><H2 | |
106 >Structure Data</H2 | |
107 ><DIV | |
108 CLASS="INFORMALTABLE" | |
109 ><A | |
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110 NAME="AEN4211" |
0 | 111 ></A |
112 ><P | |
113 ></P | |
114 ><TABLE | |
115 BORDER="0" | |
116 CLASS="CALSTABLE" | |
117 ><TBODY | |
118 ><TR | |
119 ><TD | |
120 ALIGN="LEFT" | |
121 VALIGN="TOP" | |
122 ><TT | |
123 CLASS="STRUCTFIELD" | |
124 ><I | |
125 >type</I | |
126 ></TT | |
127 ></TD | |
128 ><TD | |
129 ALIGN="LEFT" | |
130 VALIGN="TOP" | |
131 ><TT | |
132 CLASS="LITERAL" | |
133 >SDL_JOYAXISMOTION</TT | |
134 ></TD | |
135 ></TR | |
136 ><TR | |
137 ><TD | |
138 ALIGN="LEFT" | |
139 VALIGN="TOP" | |
140 ><TT | |
141 CLASS="STRUCTFIELD" | |
142 ><I | |
143 >which</I | |
144 ></TT | |
145 ></TD | |
146 ><TD | |
147 ALIGN="LEFT" | |
148 VALIGN="TOP" | |
149 >Joystick device index</TD | |
150 ></TR | |
151 ><TR | |
152 ><TD | |
153 ALIGN="LEFT" | |
154 VALIGN="TOP" | |
155 ><TT | |
156 CLASS="STRUCTFIELD" | |
157 ><I | |
158 >axis</I | |
159 ></TT | |
160 ></TD | |
161 ><TD | |
162 ALIGN="LEFT" | |
163 VALIGN="TOP" | |
164 >Joystick axis index</TD | |
165 ></TR | |
166 ><TR | |
167 ><TD | |
168 ALIGN="LEFT" | |
169 VALIGN="TOP" | |
170 ><TT | |
171 CLASS="STRUCTFIELD" | |
172 ><I | |
173 >value</I | |
174 ></TT | |
175 ></TD | |
176 ><TD | |
177 ALIGN="LEFT" | |
178 VALIGN="TOP" | |
179 >Axis value (range: -32768 to 32767)</TD | |
180 ></TR | |
181 ></TBODY | |
182 ></TABLE | |
183 ><P | |
184 ></P | |
185 ></DIV | |
186 ></DIV | |
187 ><DIV | |
188 CLASS="REFSECT1" | |
189 ><A | |
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190 NAME="AEN4231" |
0 | 191 ></A |
192 ><H2 | |
193 >Description</H2 | |
194 ><P | |
195 ><SPAN | |
196 CLASS="STRUCTNAME" | |
197 >SDL_JoyAxisEvent</SPAN | |
198 > is a member of the <A | |
199 HREF="sdlevent.html" | |
200 ><SPAN | |
201 CLASS="STRUCTNAME" | |
202 >SDL_Event</SPAN | |
203 ></A | |
204 > union and is used when an event of type <TT | |
205 CLASS="LITERAL" | |
206 >SDL_JOYAXISMOTION</TT | |
207 > is reported.</P | |
208 ><P | |
209 >A <TT | |
210 CLASS="LITERAL" | |
211 >SDL_JOYAXISMOTION</TT | |
212 > event occurs when ever a user moves an axis on the joystick. The field <TT | |
213 CLASS="STRUCTFIELD" | |
214 ><I | |
215 >which</I | |
216 ></TT | |
217 > is the index of the joystick that reported the event and <TT | |
218 CLASS="STRUCTFIELD" | |
219 ><I | |
220 >axis</I | |
221 ></TT | |
222 > is the index of the axis (for a more detailed explaination see the <A | |
223 HREF="joystick.html" | |
224 >Joystick section</A | |
225 >). <TT | |
226 CLASS="STRUCTFIELD" | |
227 ><I | |
228 >value</I | |
229 ></TT | |
230 > is the current position of the axis.</P | |
231 ></DIV | |
232 ><DIV | |
233 CLASS="REFSECT1" | |
234 ><A | |
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235 NAME="AEN4244" |
0 | 236 ></A |
237 ><H2 | |
238 >See Also</H2 | |
239 ><P | |
240 ><A | |
241 HREF="sdlevent.html" | |
242 ><SPAN | |
243 CLASS="STRUCTNAME" | |
244 >SDL_Event</SPAN | |
245 ></A | |
246 >, | |
247 <A | |
248 HREF="joystick.html" | |
249 >Joystick Functions</A | |
250 >, | |
251 <A | |
252 HREF="sdljoystickeventstate.html" | |
253 ><TT | |
254 CLASS="FUNCTION" | |
255 >SDL_JoystickEventState</TT | |
256 ></A | |
257 >, | |
258 <A | |
259 HREF="sdljoystickgetaxis.html" | |
260 ><TT | |
261 CLASS="FUNCTION" | |
262 >SDL_JoystickGetAxis</TT | |
263 ></A | |
264 ></P | |
265 ></DIV | |
266 ><DIV | |
267 CLASS="NAVFOOTER" | |
268 ><HR | |
269 ALIGN="LEFT" | |
270 WIDTH="100%"><TABLE | |
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273 BORDER="0" | |
274 CELLPADDING="0" | |
275 CELLSPACING="0" | |
276 ><TR | |
277 ><TD | |
278 WIDTH="33%" | |
279 ALIGN="left" | |
280 VALIGN="top" | |
281 ><A | |
282 HREF="sdlmousebuttonevent.html" | |
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283 ACCESSKEY="P" |
0 | 284 >Prev</A |
285 ></TD | |
286 ><TD | |
287 WIDTH="34%" | |
288 ALIGN="center" | |
289 VALIGN="top" | |
290 ><A | |
291 HREF="index.html" | |
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292 ACCESSKEY="H" |
0 | 293 >Home</A |
294 ></TD | |
295 ><TD | |
296 WIDTH="33%" | |
297 ALIGN="right" | |
298 VALIGN="top" | |
299 ><A | |
300 HREF="sdljoybuttonevent.html" | |
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301 ACCESSKEY="N" |
0 | 302 >Next</A |
303 ></TD | |
304 ></TR | |
305 ><TR | |
306 ><TD | |
307 WIDTH="33%" | |
308 ALIGN="left" | |
309 VALIGN="top" | |
310 >SDL_MouseButtonEvent</TD | |
311 ><TD | |
312 WIDTH="34%" | |
313 ALIGN="center" | |
314 VALIGN="top" | |
315 ><A | |
316 HREF="eventstructures.html" | |
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317 ACCESSKEY="U" |
0 | 318 >Up</A |
319 ></TD | |
320 ><TD | |
321 WIDTH="33%" | |
322 ALIGN="right" | |
323 VALIGN="top" | |
324 >SDL_JoyButtonEvent</TD | |
325 ></TR | |
326 ></TABLE | |
327 ></DIV | |
328 ></BODY | |
329 ></HTML | |
330 > |