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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
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<HTML
><HEAD
><TITLE
>SDL_GetModState</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"><LINK
REL="HOME"
TITLE="SDL Library Documentation"
HREF="index.html"><LINK
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TITLE="Event Functions."
HREF="eventfunctions.html"><LINK
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TITLE="SDL_GetKeyState"
HREF="sdlgetkeystate.html"><LINK
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TITLE="SDL_SetModState"
HREF="sdlsetmodstate.html"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFF8DC"
TEXT="#000000"
LINK="#0000ee"
VLINK="#551a8b"
ALINK="#ff0000"
><DIV
CLASS="NAVHEADER"
><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
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>SDL Library Documentation</TH
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>Next</A
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><HR
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WIDTH="100%"></DIV
><H1
><A
NAME="SDLGETMODSTATE"
>SDL_GetModState</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5333"
></A
><H2
>Name</H2
>SDL_GetModState&nbsp;--&nbsp;Get the state of modifier keys.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN5336"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN5337"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>SDLMod <B
CLASS="FSFUNC"
>SDL_GetModState</B
></CODE
>(void);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5343"
></A
><H2
>Description</H2
><P
>Returns the current state of the modifier keys (CTRL, ALT, etc.).</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5346"
></A
><H2
>Return Value</H2
><P
>The return value can be an OR'd combination of the SDLMod enum.</P
><P
><A
NAME="AEN5350"
></A
><BLOCKQUOTE
CLASS="BLOCKQUOTE"
><P
><B
>SDLMod</B
></P
><PRE
CLASS="PROGRAMLISTING"
>typedef enum {
  KMOD_NONE  = 0x0000,
  KMOD_LSHIFT= 0x0001,
  KMOD_RSHIFT= 0x0002,
  KMOD_LCTRL = 0x0040,
  KMOD_RCTRL = 0x0080,
  KMOD_LALT  = 0x0100,
  KMOD_RALT  = 0x0200,
  KMOD_LMETA = 0x0400,
  KMOD_RMETA = 0x0800,
  KMOD_NUM   = 0x1000,
  KMOD_CAPS  = 0x2000,
  KMOD_MODE  = 0x4000,
} SDLMod;</PRE
></BLOCKQUOTE
>
SDL also defines the following symbols for convenience:
<A
NAME="AEN5353"
></A
><BLOCKQUOTE
CLASS="BLOCKQUOTE"
><PRE
CLASS="PROGRAMLISTING"
>#define KMOD_CTRL (KMOD_LCTRL|KMOD_RCTRL)
#define KMOD_SHIFT  (KMOD_LSHIFT|KMOD_RSHIFT)
#define KMOD_ALT  (KMOD_LALT|KMOD_RALT)
#define KMOD_META (KMOD_LMETA|KMOD_RMETA)</PRE
></BLOCKQUOTE
></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN5355"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlgetkeystate.html"
><TT
CLASS="FUNCTION"
>SDL_GetKeyState</TT
></A
></P
></DIV
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>SDL_GetKeyState</TD
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>