Mercurial > sdl-ios-xcode
view docs/html/sdlkeysym.html @ 2320:166400aa33d7
Deleted a call to X__PumpEvents at the end of X11_GL_InitExtensions(). This function is being called from SDL_RecreateWindow at a point when the numwindows value in
is incorrect. The result is that an illegal access is being made in X_PumpEvents when it tries to look up the windows ID of the source of an event. Taking out that
call does not seem to have any effect on the testgl. But, I would be happy if someone else took a look at this problem and found a fix higher up the stack.
author | Bob Pendleton <bob@pendleton.com> |
---|---|
date | Sat, 01 Mar 2008 20:34:36 +0000 |
parents | 355632dca928 |
children |
line wrap: on
line source
<HTML ><HEAD ><TITLE >SDL_keysym</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="SDL Library Documentation" HREF="index.html"><LINK REL="UP" TITLE="SDL Event Structures." HREF="eventstructures.html"><LINK REL="PREVIOUS" TITLE="SDL_QuitEvent" HREF="sdlquitevent.html"><LINK REL="NEXT" TITLE="SDLKey" HREF="sdlkey.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFF8DC" TEXT="#000000" LINK="#0000ee" VLINK="#551a8b" ALINK="#ff0000" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >SDL Library Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="sdlquitevent.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="sdlkey.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SDLKEYSYM" ></A >SDL_keysym</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN4659" ></A ><H2 >Name</H2 >SDL_keysym -- Keysym structure</DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4662" ></A ><H2 >Structure Definition</H2 ><PRE CLASS="PROGRAMLISTING" >typedef struct{ Uint8 scancode; SDLKey sym; SDLMod mod; Uint16 unicode; } SDL_keysym;</PRE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4665" ></A ><H2 >Structure Data</H2 ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN4667" ></A ><P ></P ><TABLE BORDER="0" CLASS="CALSTABLE" ><TBODY ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="STRUCTFIELD" ><I >scancode</I ></TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Hardware specific scancode</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="STRUCTFIELD" ><I >sym</I ></TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >SDL virtual keysym</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="STRUCTFIELD" ><I >mod</I ></TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Current key modifiers</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="STRUCTFIELD" ><I >unicode</I ></TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Translated character</TD ></TR ></TBODY ></TABLE ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4686" ></A ><H2 >Description</H2 ><P >The <SPAN CLASS="STRUCTNAME" >SDL_keysym</SPAN > structure is used by reporting key presses and releases since it is a part of the <A HREF="sdlkeyboardevent.html" ><SPAN CLASS="STRUCTNAME" >SDL_KeyboardEvent</SPAN ></A >.</P ><P >The <TT CLASS="STRUCTFIELD" ><I >scancode</I ></TT > field should generally be left alone, it is the hardware dependent scancode returned by the keyboard. The <TT CLASS="STRUCTFIELD" ><I >sym</I ></TT > field is extremely useful. It is the SDL-defined value of the key (see <A HREF="sdlkey.html" >SDL Key Syms</A >. This field is very useful when you are checking for certain key presses, like so: <PRE CLASS="PROGRAMLISTING" >. . while(SDL_PollEvent(&event)){ switch(event.type){ case SDL_KEYDOWN: if(event.key.keysym.sym==SDLK_LEFT) move_left(); break; . . . } } . .</PRE > <TT CLASS="STRUCTFIELD" ><I >mod</I ></TT > stores the current state of the keyboard modifiers as explained in <A HREF="sdlgetmodstate.html" ><TT CLASS="FUNCTION" >SDL_GetModState</TT ></A >. The <TT CLASS="STRUCTFIELD" ><I >unicode</I ></TT > is only used when UNICODE translation is enabled with <A HREF="sdlenableunicode.html" ><TT CLASS="FUNCTION" >SDL_EnableUNICODE</TT ></A >. If <TT CLASS="STRUCTFIELD" ><I >unicode</I ></TT > is non-zero then this a the UNICODE character corresponding to the keypress. If the high 9 bits of the character are 0, then this maps to the equivalent ASCII character: <PRE CLASS="PROGRAMLISTING" >char ch; if ( (keysym.unicode & 0xFF80) == 0 ) { ch = keysym.unicode & 0x7F; } else { printf("An International Character.\n"); }</PRE > UNICODE translation does have a slight overhead so don't enable it unless its needed.</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN4705" ></A ><H2 >See Also</H2 ><P ><A HREF="sdlkey.html" ><SPAN CLASS="STRUCTNAME" >SDLKey</SPAN ></A ></P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sdlquitevent.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sdlkey.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SDL_QuitEvent</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="eventstructures.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SDLKey</TD ></TR ></TABLE ></DIV ></BODY ></HTML >