Mercurial > sdl-ios-xcode
annotate docs/html/sdllockaudio.html @ 615:7ec821f3cbd0
Date: Thu, 17 Apr 2003 23:27:34 -0400
From: Darrell Walisser
Subject: Yet another OS X cursor bug
The synopsis:
1. Call SDL_ShowCursor(0);
2. Call SDL_SetVideoMode();
3. Call SDL_GetEvent();
3. Call SDL_ShowCursor(1);
The result: Sometimes the cursor doesn't come back! Ack! Oddly enough,
it does come back when mousing over the dock or clicking in the menu
bar. But that's besides the point.
The reason why this is happening is a flaw in the handling of
activation/deactivation events. The short explanation is that the
HideCursor() and ShowCursor() calls must be balanced, but if the cursor
was initially hidden, HideCursor() was called again on the activate
event - so now the next ShowCursor() fails (as does the next, and the
next, for some reason).
So, here's the patch. All it does is keep track of the
HideCursor()/ShowCursor() calls so that they will always be balanced.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 20 Apr 2003 05:41:16 +0000 |
parents | e5bc29de3f0a |
children | 355632dca928 |
rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_LockAudio</TITLE | |
5 ><META | |
6 NAME="GENERATOR" | |
55
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
0 | 8 "><LINK |
9 REL="HOME" | |
10 TITLE="SDL Library Documentation" | |
11 HREF="index.html"><LINK | |
12 REL="UP" | |
13 TITLE="Audio" | |
14 HREF="audio.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_MixAudio" | |
17 HREF="sdlmixaudio.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_UnlockAudio" | |
20 HREF="sdlunlockaudio.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 | |
31 WIDTH="100%" | |
32 BORDER="0" | |
33 CELLPADDING="0" | |
34 CELLSPACING="0" | |
35 ><TR | |
36 ><TH | |
37 COLSPAN="3" | |
38 ALIGN="center" | |
39 >SDL Library Documentation</TH | |
40 ></TR | |
41 ><TR | |
42 ><TD | |
43 WIDTH="10%" | |
44 ALIGN="left" | |
45 VALIGN="bottom" | |
46 ><A | |
47 HREF="sdlmixaudio.html" | |
48 >Prev</A | |
49 ></TD | |
50 ><TD | |
51 WIDTH="80%" | |
52 ALIGN="center" | |
53 VALIGN="bottom" | |
54 ></TD | |
55 ><TD | |
56 WIDTH="10%" | |
57 ALIGN="right" | |
58 VALIGN="bottom" | |
59 ><A | |
60 HREF="sdlunlockaudio.html" | |
61 >Next</A | |
62 ></TD | |
63 ></TR | |
64 ></TABLE | |
65 ><HR | |
66 ALIGN="LEFT" | |
67 WIDTH="100%"></DIV | |
68 ><H1 | |
69 ><A | |
70 NAME="SDLLOCKAUDIO" | |
71 >SDL_LockAudio</A | |
72 ></H1 | |
73 ><DIV | |
74 CLASS="REFNAMEDIV" | |
75 ><A | |
181
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76 NAME="AEN6746" |
0 | 77 ></A |
78 ><H2 | |
79 >Name</H2 | |
80 >SDL_LockAudio -- Lock out the callback function</DIV | |
81 ><DIV | |
82 CLASS="REFSYNOPSISDIV" | |
83 ><A | |
181
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84 NAME="AEN6749" |
0 | 85 ></A |
86 ><H2 | |
87 >Synopsis</H2 | |
88 ><DIV | |
89 CLASS="FUNCSYNOPSIS" | |
90 ><A | |
181
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91 NAME="AEN6750" |
0 | 92 ></A |
93 ><P | |
94 ></P | |
95 ><PRE | |
96 CLASS="FUNCSYNOPSISINFO" | |
97 >#include "SDL.h"</PRE | |
98 ><P | |
99 ><CODE | |
100 ><CODE | |
101 CLASS="FUNCDEF" | |
102 >void <B | |
103 CLASS="FSFUNC" | |
104 >SDL_LockAudio</B | |
105 ></CODE | |
106 >(void);</CODE | |
107 ></P | |
108 ><P | |
109 ></P | |
110 ></DIV | |
111 ></DIV | |
112 ><DIV | |
113 CLASS="REFSECT1" | |
114 ><A | |
181
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115 NAME="AEN6756" |
0 | 116 ></A |
117 ><H2 | |
118 >Description</H2 | |
119 ><P | |
120 >The lock manipulated by these functions protects the callback function. | |
121 During a LockAudio period, you can be guaranteed that the | |
122 callback function is not running. Do not call these from the callback | |
123 function or you will cause deadlock.</P | |
124 ></DIV | |
125 ><DIV | |
126 CLASS="REFSECT1" | |
127 ><A | |
181
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128 NAME="AEN6759" |
0 | 129 ></A |
130 ><H2 | |
131 >See Also</H2 | |
132 ><P | |
133 ><A | |
134 HREF="sdlopenaudio.html" | |
135 ><TT | |
136 CLASS="FUNCTION" | |
137 >SDL_OpenAudio</TT | |
138 ></A | |
139 ></P | |
140 ></DIV | |
141 ><DIV | |
142 CLASS="NAVFOOTER" | |
143 ><HR | |
144 ALIGN="LEFT" | |
145 WIDTH="100%"><TABLE | |
146 WIDTH="100%" | |
147 BORDER="0" | |
148 CELLPADDING="0" | |
149 CELLSPACING="0" | |
150 ><TR | |
151 ><TD | |
152 WIDTH="33%" | |
153 ALIGN="left" | |
154 VALIGN="top" | |
155 ><A | |
156 HREF="sdlmixaudio.html" | |
157 >Prev</A | |
158 ></TD | |
159 ><TD | |
160 WIDTH="34%" | |
161 ALIGN="center" | |
162 VALIGN="top" | |
163 ><A | |
164 HREF="index.html" | |
165 >Home</A | |
166 ></TD | |
167 ><TD | |
168 WIDTH="33%" | |
169 ALIGN="right" | |
170 VALIGN="top" | |
171 ><A | |
172 HREF="sdlunlockaudio.html" | |
173 >Next</A | |
174 ></TD | |
175 ></TR | |
176 ><TR | |
177 ><TD | |
178 WIDTH="33%" | |
179 ALIGN="left" | |
180 VALIGN="top" | |
181 >SDL_MixAudio</TD | |
182 ><TD | |
183 WIDTH="34%" | |
184 ALIGN="center" | |
185 VALIGN="top" | |
186 ><A | |
187 HREF="audio.html" | |
188 >Up</A | |
189 ></TD | |
190 ><TD | |
191 WIDTH="33%" | |
192 ALIGN="right" | |
193 VALIGN="top" | |
194 >SDL_UnlockAudio</TD | |
195 ></TR | |
196 ></TABLE | |
197 ></DIV | |
198 ></BODY | |
199 ></HTML | |
200 > |