Mercurial > sdl-ios-xcode
annotate docs/html/sdlmousebuttonevent.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> |
---|---|
date | Mon, 02 Jan 2006 00:31:00 +0000 |
parents | 355632dca928 |
children |
rev | line source |
---|---|
0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_MouseButtonEvent</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
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_MouseMotionEvent" | |
17 HREF="sdlmousemotionevent.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_JoyAxisEvent" | |
20 HREF="sdljoyaxisevent.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 | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
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="sdlmousemotionevent.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
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="sdljoyaxisevent.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
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="SDLMOUSEBUTTONEVENT" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
74 ></A |
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
75 >SDL_MouseButtonEvent</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
79 NAME="AEN4144" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_MouseButtonEvent -- Mouse button event structure</DIV | |
84 ><DIV | |
85 CLASS="REFSECT1" | |
86 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
87 NAME="AEN4147" |
0 | 88 ></A |
89 ><H2 | |
90 >Structure Definition</H2 | |
91 ><PRE | |
92 CLASS="PROGRAMLISTING" | |
93 >typedef struct{ | |
94 Uint8 type; | |
95 Uint8 button; | |
96 Uint8 state; | |
97 Uint16 x, y; | |
98 } SDL_MouseButtonEvent;</PRE | |
99 ></DIV | |
100 ><DIV | |
101 CLASS="REFSECT1" | |
102 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
103 NAME="AEN4150" |
0 | 104 ></A |
105 ><H2 | |
106 >Structure Data</H2 | |
107 ><DIV | |
108 CLASS="INFORMALTABLE" | |
109 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
110 NAME="AEN4152" |
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_MOUSEBUTTONDOWN</TT | |
134 > or <TT | |
135 CLASS="LITERAL" | |
136 >SDL_MOUSEBUTTONUP</TT | |
137 ></TD | |
138 ></TR | |
139 ><TR | |
140 ><TD | |
141 ALIGN="LEFT" | |
142 VALIGN="TOP" | |
143 ><TT | |
144 CLASS="STRUCTFIELD" | |
145 ><I | |
146 >button</I | |
147 ></TT | |
148 ></TD | |
149 ><TD | |
150 ALIGN="LEFT" | |
151 VALIGN="TOP" | |
152 >The mouse button index (SDL_BUTTON_LEFT, SDL_BUTTON_MIDDLE, SDL_BUTTON_RIGHT)</TD | |
153 ></TR | |
154 ><TR | |
155 ><TD | |
156 ALIGN="LEFT" | |
157 VALIGN="TOP" | |
158 ><TT | |
159 CLASS="STRUCTFIELD" | |
160 ><I | |
161 >state</I | |
162 ></TT | |
163 ></TD | |
164 ><TD | |
165 ALIGN="LEFT" | |
166 VALIGN="TOP" | |
167 ><TT | |
168 CLASS="LITERAL" | |
169 >SDL_PRESSED</TT | |
170 > or <TT | |
171 CLASS="LITERAL" | |
172 >SDL_RELEASED</TT | |
173 ></TD | |
174 ></TR | |
175 ><TR | |
176 ><TD | |
177 ALIGN="LEFT" | |
178 VALIGN="TOP" | |
179 ><TT | |
180 CLASS="STRUCTFIELD" | |
181 ><I | |
182 >x</I | |
183 ></TT | |
184 >, <TT | |
185 CLASS="STRUCTFIELD" | |
186 ><I | |
187 >y</I | |
188 ></TT | |
189 ></TD | |
190 ><TD | |
191 ALIGN="LEFT" | |
192 VALIGN="TOP" | |
193 >The X/Y coordinates of the mouse at press/release time</TD | |
194 ></TR | |
195 ></TBODY | |
196 ></TABLE | |
197 ><P | |
198 ></P | |
199 ></DIV | |
200 ></DIV | |
201 ><DIV | |
202 CLASS="REFSECT1" | |
203 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
204 NAME="AEN4176" |
0 | 205 ></A |
206 ><H2 | |
207 >Description</H2 | |
208 ><P | |
209 ><SPAN | |
210 CLASS="STRUCTNAME" | |
211 >SDL_MouseButtonEvent</SPAN | |
212 > is a member of the <A | |
213 HREF="sdlevent.html" | |
214 ><SPAN | |
215 CLASS="STRUCTNAME" | |
216 >SDL_Event</SPAN | |
217 ></A | |
218 > union and is used when an event of type <TT | |
219 CLASS="LITERAL" | |
220 >SDL_MOUSEBUTTONDOWN</TT | |
221 > or <TT | |
222 CLASS="LITERAL" | |
223 >SDL_MOUSEBUTTONUP</TT | |
224 > is reported.</P | |
225 ><P | |
226 >When a mouse button press or release is detected then number of the button pressed (from 1 to 255, with 1 usually being the left button and 2 the right) is placed into <TT | |
227 CLASS="STRUCTFIELD" | |
228 ><I | |
229 >button</I | |
230 ></TT | |
231 >, the position of the mouse when this event occured is stored in the <TT | |
232 CLASS="STRUCTFIELD" | |
233 ><I | |
234 >x</I | |
235 ></TT | |
236 > and the <TT | |
237 CLASS="STRUCTFIELD" | |
238 ><I | |
239 >y</I | |
240 ></TT | |
241 > fields. Like <A | |
242 HREF="sdlkeyboardevent.html" | |
243 ><SPAN | |
244 CLASS="STRUCTNAME" | |
245 >SDL_KeyboardEvent</SPAN | |
246 ></A | |
247 >, information on whether the event was a press or a release event is stored in both the <TT | |
248 CLASS="STRUCTFIELD" | |
249 ><I | |
250 >type</I | |
251 ></TT | |
252 > and <TT | |
253 CLASS="STRUCTFIELD" | |
254 ><I | |
255 >state</I | |
256 ></TT | |
257 > fields, but this should be obvious.</P | |
258 ></DIV | |
259 ><DIV | |
260 CLASS="REFSECT1" | |
261 ><A | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
262 NAME="AEN4192" |
0 | 263 ></A |
264 ><H2 | |
265 >See Also</H2 | |
266 ><P | |
267 ><A | |
268 HREF="sdlevent.html" | |
269 ><SPAN | |
270 CLASS="STRUCTNAME" | |
271 >SDL_Event</SPAN | |
272 ></A | |
273 >, | |
274 <A | |
275 HREF="sdlmousemotionevent.html" | |
276 ><SPAN | |
277 CLASS="STRUCTNAME" | |
278 >SDL_MouseMotionEvent</SPAN | |
279 ></A | |
280 ></P | |
281 ></DIV | |
282 ><DIV | |
283 CLASS="NAVFOOTER" | |
284 ><HR | |
285 ALIGN="LEFT" | |
286 WIDTH="100%"><TABLE | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
287 SUMMARY="Footer navigation table" |
0 | 288 WIDTH="100%" |
289 BORDER="0" | |
290 CELLPADDING="0" | |
291 CELLSPACING="0" | |
292 ><TR | |
293 ><TD | |
294 WIDTH="33%" | |
295 ALIGN="left" | |
296 VALIGN="top" | |
297 ><A | |
298 HREF="sdlmousemotionevent.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
299 ACCESSKEY="P" |
0 | 300 >Prev</A |
301 ></TD | |
302 ><TD | |
303 WIDTH="34%" | |
304 ALIGN="center" | |
305 VALIGN="top" | |
306 ><A | |
307 HREF="index.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
308 ACCESSKEY="H" |
0 | 309 >Home</A |
310 ></TD | |
311 ><TD | |
312 WIDTH="33%" | |
313 ALIGN="right" | |
314 VALIGN="top" | |
315 ><A | |
316 HREF="sdljoyaxisevent.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
317 ACCESSKEY="N" |
0 | 318 >Next</A |
319 ></TD | |
320 ></TR | |
321 ><TR | |
322 ><TD | |
323 WIDTH="33%" | |
324 ALIGN="left" | |
325 VALIGN="top" | |
326 >SDL_MouseMotionEvent</TD | |
327 ><TD | |
328 WIDTH="34%" | |
329 ALIGN="center" | |
330 VALIGN="top" | |
331 ><A | |
332 HREF="eventstructures.html" | |
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
333 ACCESSKEY="U" |
0 | 334 >Up</A |
335 ></TD | |
336 ><TD | |
337 WIDTH="33%" | |
338 ALIGN="right" | |
339 VALIGN="top" | |
340 >SDL_JoyAxisEvent</TD | |
341 ></TR | |
342 ></TABLE | |
343 ></DIV | |
344 ></BODY | |
345 ></HTML | |
346 > |