Mercurial > sdl-ios-xcode
annotate docs/html/sdlpollevent.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> |
|---|---|
| date | Sun, 20 Apr 2003 05:41:16 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_PollEvent</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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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="Event Functions." | |
| 14 HREF="eventfunctions.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_PeepEvents" | |
| 17 HREF="sdlpeepevents.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_WaitEvent" | |
| 20 HREF="sdlwaitevent.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="sdlpeepevents.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="sdlwaitevent.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="SDLPOLLEVENT" | |
| 71 >SDL_PollEvent</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN5084" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_PollEvent -- Polls for currently pending events.</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN5087" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
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91 NAME="AEN5088" |
| 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 >int <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_PollEvent</B | |
| 105 ></CODE | |
| 106 >(SDL_Event *event);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN5094" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Polls for currently pending events, and returns <SPAN | |
| 121 CLASS="RETURNVALUE" | |
| 122 >1</SPAN | |
| 123 > | |
| 124 if there are any pending events, or <SPAN | |
| 125 CLASS="RETURNVALUE" | |
| 126 >0</SPAN | |
| 127 > if there | |
| 128 are none available. </P | |
| 129 ><P | |
| 130 >If <TT | |
| 131 CLASS="PARAMETER" | |
| 132 ><I | |
| 133 >event</I | |
| 134 ></TT | |
| 135 > is not <TT | |
| 136 CLASS="LITERAL" | |
| 137 >NULL</TT | |
| 138 >, the next | |
| 139 event is removed from the queue and stored in that area.</P | |
| 140 ></DIV | |
| 141 ><DIV | |
| 142 CLASS="REFSECT1" | |
| 143 ><A | |
|
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144 NAME="AEN5102" |
| 0 | 145 ></A |
| 146 ><H2 | |
| 147 >Examples</H2 | |
| 148 ><P | |
| 149 ><PRE | |
| 150 CLASS="PROGRAMLISTING" | |
| 151 >SDL_Event event; /* Event structure */ | |
| 152 | |
| 153 . | |
| 154 . | |
| 155 . | |
| 156 /* Check for events */ | |
| 157 while(SDL_PollEvent(&event)){ /* Loop until there are no events left on the queue */ | |
| 158 switch(event.type){ /* Process the appropiate event type */ | |
| 159 case SDL_KEYDOWN: /* Handle a KEYDOWN event */ | |
| 160 printf("Oh! Key press\n"); | |
| 161 break; | |
| 162 case SDL_MOUSEMOTION: | |
| 163 . | |
| 164 . | |
| 165 . | |
| 166 default: /* Report an unhandled event */ | |
| 167 printf("I don't know what this event is!\n"); | |
| 168 } | |
| 169 }</PRE | |
| 170 ></P | |
| 171 ></DIV | |
| 172 ><DIV | |
| 173 CLASS="REFSECT1" | |
| 174 ><A | |
|
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175 NAME="AEN5106" |
| 0 | 176 ></A |
| 177 ><H2 | |
| 178 >See Also</H2 | |
| 179 ><P | |
| 180 ><A | |
| 181 HREF="sdlevent.html" | |
| 182 ><SPAN | |
| 183 CLASS="STRUCTNAME" | |
| 184 >SDL_Event</SPAN | |
| 185 ></A | |
| 186 >, | |
| 187 <A | |
| 188 HREF="sdlwaitevent.html" | |
| 189 ><TT | |
| 190 CLASS="FUNCTION" | |
| 191 >SDL_WaitEvent</TT | |
| 192 ></A | |
| 193 >, | |
| 194 <A | |
| 195 HREF="sdlpeepevents.html" | |
| 196 ><TT | |
| 197 CLASS="FUNCTION" | |
| 198 >SDL_PeepEvents</TT | |
| 199 ></A | |
| 200 ></P | |
| 201 ></DIV | |
| 202 ><DIV | |
| 203 CLASS="NAVFOOTER" | |
| 204 ><HR | |
| 205 ALIGN="LEFT" | |
| 206 WIDTH="100%"><TABLE | |
| 207 WIDTH="100%" | |
| 208 BORDER="0" | |
| 209 CELLPADDING="0" | |
| 210 CELLSPACING="0" | |
| 211 ><TR | |
| 212 ><TD | |
| 213 WIDTH="33%" | |
| 214 ALIGN="left" | |
| 215 VALIGN="top" | |
| 216 ><A | |
| 217 HREF="sdlpeepevents.html" | |
| 218 >Prev</A | |
| 219 ></TD | |
| 220 ><TD | |
| 221 WIDTH="34%" | |
| 222 ALIGN="center" | |
| 223 VALIGN="top" | |
| 224 ><A | |
| 225 HREF="index.html" | |
| 226 >Home</A | |
| 227 ></TD | |
| 228 ><TD | |
| 229 WIDTH="33%" | |
| 230 ALIGN="right" | |
| 231 VALIGN="top" | |
| 232 ><A | |
| 233 HREF="sdlwaitevent.html" | |
| 234 >Next</A | |
| 235 ></TD | |
| 236 ></TR | |
| 237 ><TR | |
| 238 ><TD | |
| 239 WIDTH="33%" | |
| 240 ALIGN="left" | |
| 241 VALIGN="top" | |
| 242 >SDL_PeepEvents</TD | |
| 243 ><TD | |
| 244 WIDTH="34%" | |
| 245 ALIGN="center" | |
| 246 VALIGN="top" | |
| 247 ><A | |
| 248 HREF="eventfunctions.html" | |
| 249 >Up</A | |
| 250 ></TD | |
| 251 ><TD | |
| 252 WIDTH="33%" | |
| 253 ALIGN="right" | |
| 254 VALIGN="top" | |
| 255 >SDL_WaitEvent</TD | |
| 256 ></TR | |
| 257 ></TABLE | |
| 258 ></DIV | |
| 259 ></BODY | |
| 260 ></HTML | |
| 261 > |