Initial revision
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This commit is contained in:
Sam Lantinga
commit
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docs/html/sdlevent.html
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docs/html/sdlevent.html
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<HTML
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><HEAD
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><TITLE
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>SDL_Event</TITLE
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><META
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NAME="GENERATOR"
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||||
CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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||||
"><LINK
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||||
REL="HOME"
|
||||
TITLE="SDL Library Documentation"
|
||||
HREF="index.html"><LINK
|
||||
REL="UP"
|
||||
TITLE="SDL Event Structures."
|
||||
HREF="eventstructures.html"><LINK
|
||||
REL="PREVIOUS"
|
||||
TITLE="SDL Event Structures."
|
||||
HREF="eventstructures.html"><LINK
|
||||
REL="NEXT"
|
||||
TITLE="SDL_ActiveEvent"
|
||||
HREF="sdlactiveevent.html"></HEAD
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||||
><BODY
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||||
CLASS="REFENTRY"
|
||||
BGCOLOR="#FFF8DC"
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||||
TEXT="#000000"
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||||
LINK="#0000ee"
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||||
VLINK="#551a8b"
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||||
ALINK="#ff0000"
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||||
><DIV
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||||
CLASS="NAVHEADER"
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||||
><TABLE
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||||
WIDTH="100%"
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||||
BORDER="0"
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||||
CELLPADDING="0"
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||||
CELLSPACING="0"
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||||
><TR
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||||
><TH
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||||
COLSPAN="3"
|
||||
ALIGN="center"
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||||
>SDL Library Documentation</TH
|
||||
></TR
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||||
><TR
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||||
><TD
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||||
WIDTH="10%"
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||||
ALIGN="left"
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||||
VALIGN="bottom"
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||||
><A
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||||
HREF="eventstructures.html"
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||||
>Prev</A
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||||
></TD
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||||
><TD
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||||
WIDTH="80%"
|
||||
ALIGN="center"
|
||||
VALIGN="bottom"
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||||
></TD
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||||
><TD
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||||
WIDTH="10%"
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||||
ALIGN="right"
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||||
VALIGN="bottom"
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||||
><A
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||||
HREF="sdlactiveevent.html"
|
||||
>Next</A
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||||
></TD
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||||
></TR
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||||
></TABLE
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||||
><HR
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||||
ALIGN="LEFT"
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||||
WIDTH="100%"></DIV
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||||
><H1
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><A
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NAME="SDLEVENT"
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>SDL_Event</A
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||||
></H1
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||||
><DIV
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||||
CLASS="REFNAMEDIV"
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||||
><A
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||||
NAME="AEN3214"
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||||
></A
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||||
><H2
|
||||
>Name</H2
|
||||
>SDL_Event -- General event structure</DIV
|
||||
><DIV
|
||||
CLASS="REFSECT1"
|
||||
><A
|
||||
NAME="AEN3217"
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||||
></A
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||||
><H2
|
||||
>Structure Definition</H2
|
||||
><PRE
|
||||
CLASS="PROGRAMLISTING"
|
||||
>typedef union{
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Uint8 type;
|
||||
SDL_ActiveEvent active;
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||||
SDL_KeyboardEvent key;
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||||
SDL_MouseMotionEvent motion;
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||||
SDL_MouseButtonEvent button;
|
||||
SDL_JoyAxisEvent jaxis;
|
||||
SDL_JoyBallEvent jball;
|
||||
SDL_JoyHatEvent jhat;
|
||||
SDL_JoyButtonEvent jbutton;
|
||||
SDL_ResizeEvent resize;
|
||||
SDL_QuitEvent quit;
|
||||
SDL_UserEvent user;
|
||||
SDL_SywWMEvent syswm;
|
||||
} SDL_Event;</PRE
|
||||
></DIV
|
||||
><DIV
|
||||
CLASS="REFSECT1"
|
||||
><A
|
||||
NAME="AEN3220"
|
||||
></A
|
||||
><H2
|
||||
>Structure Data</H2
|
||||
><DIV
|
||||
CLASS="INFORMALTABLE"
|
||||
><A
|
||||
NAME="AEN3222"
|
||||
></A
|
||||
><P
|
||||
></P
|
||||
><TABLE
|
||||
BORDER="0"
|
||||
CLASS="CALSTABLE"
|
||||
><TBODY
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>type</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
>The type of event</TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>active</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlactiveevent.html"
|
||||
>Activation event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>key</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlkeyboardevent.html"
|
||||
>Keyboard event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>motion</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlmousemotionevent.html"
|
||||
>Mouse motion event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>button</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlmousebuttonevent.html"
|
||||
>Mouse button event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>jaxis</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdljoyaxisevent.html"
|
||||
>Joystick axis motion event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>jball</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdljoyballevent.html"
|
||||
>Joystick trackball motion event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>jhat</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdljoyhatevent.html"
|
||||
>Joystick hat motion event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>jbutton</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdljoybuttonevent.html"
|
||||
>Joystick button event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>resize</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlresizeevent.html"
|
||||
>Application window resize event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>quit</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlquitevent.html"
|
||||
>Application quit request event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>user</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdluserevent.html"
|
||||
>User defined event</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>syswm</I
|
||||
></TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlsyswmevent.html"
|
||||
>Undefined window manager event</A
|
||||
></TD
|
||||
></TR
|
||||
></TBODY
|
||||
></TABLE
|
||||
><P
|
||||
></P
|
||||
></DIV
|
||||
></DIV
|
||||
><DIV
|
||||
CLASS="REFSECT1"
|
||||
><A
|
||||
NAME="AEN3289"
|
||||
></A
|
||||
><H2
|
||||
>Description</H2
|
||||
><P
|
||||
>The <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_Event</SPAN
|
||||
> union is the core to all event handling is SDL, its probably the most important structure after <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_Surface</SPAN
|
||||
>. <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_Event</SPAN
|
||||
> is a union of all event structures used in SDL, using it is a simple matter of knowing which union member relates to which event <TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>type</I
|
||||
></TT
|
||||
>.</P
|
||||
><P
|
||||
><DIV
|
||||
CLASS="INFORMALTABLE"
|
||||
><A
|
||||
NAME="AEN3297"
|
||||
></A
|
||||
><P
|
||||
></P
|
||||
><TABLE
|
||||
BORDER="1"
|
||||
CLASS="CALSTABLE"
|
||||
><THEAD
|
||||
><TR
|
||||
><TH
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
>Event <TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>type</I
|
||||
></TT
|
||||
></TH
|
||||
><TH
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
>Event Structure</TH
|
||||
></TR
|
||||
></THEAD
|
||||
><TBODY
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="MIDDLE"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_ACTIVEEVENT</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="MIDDLE"
|
||||
><A
|
||||
HREF="sdlactiveevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_ActiveEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_KEYDOWN/UP</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlkeyboardevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_KeyboardEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_MOUSEMOTION</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlmousemotionevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_MouseMotionEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_MOUSEBUTTONDOWN/UP</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlmousebuttonevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_MouseButtonEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_JOYAXISMOTION</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdljoyaxisevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_JoyAxisEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_JOYBALLMOTION</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdljoyballevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_JoyBallEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_JOYHATMOTION</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdljoyhatevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_JoyHatEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_JOYBUTTONDOWN/UP</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdljoybuttonevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_JoyButtonEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_QUIT</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlquitevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_QuitEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_SYSWMEVENT</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlsyswmevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_SysWMEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_VIDEORESIZE</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdlresizeevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_ResizeEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_USEREVENT</TT
|
||||
></TD
|
||||
><TD
|
||||
ALIGN="LEFT"
|
||||
VALIGN="TOP"
|
||||
><A
|
||||
HREF="sdluserevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_UserEvent</SPAN
|
||||
></A
|
||||
></TD
|
||||
></TR
|
||||
></TBODY
|
||||
></TABLE
|
||||
><P
|
||||
></P
|
||||
></DIV
|
||||
></P
|
||||
></DIV
|
||||
><DIV
|
||||
CLASS="REFSECT1"
|
||||
><A
|
||||
NAME="AEN3377"
|
||||
></A
|
||||
><H2
|
||||
>Use</H2
|
||||
><P
|
||||
>The <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_Event</SPAN
|
||||
> structure has two uses</P
|
||||
><P
|
||||
></P
|
||||
><UL
|
||||
COMPACT="COMPACT"
|
||||
><LI
|
||||
><P
|
||||
>Reading events on the event queue</P
|
||||
></LI
|
||||
><LI
|
||||
><P
|
||||
>Placing events on the event queue</P
|
||||
></LI
|
||||
></UL
|
||||
><P
|
||||
>Reading events from the event queue is done with either <A
|
||||
HREF="sdlpollevent.html"
|
||||
><TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PollEvent</TT
|
||||
></A
|
||||
> or <A
|
||||
HREF="sdlpeepevents.html"
|
||||
><TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PeepEvents</TT
|
||||
></A
|
||||
>. We'll use <TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PollEvent</TT
|
||||
> and step through an example.</P
|
||||
><P
|
||||
>First off, we create an empty <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_Event</SPAN
|
||||
> structure.
|
||||
<PRE
|
||||
CLASS="PROGRAMLISTING"
|
||||
>SDL_Event test_event;</PRE
|
||||
>
|
||||
<TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PollEvent</TT
|
||||
> removes the next event from the event queue, if there are no events on the queue it returns <SPAN
|
||||
CLASS="RETURNVALUE"
|
||||
>0</SPAN
|
||||
> otherwise it returns <SPAN
|
||||
CLASS="RETURNVALUE"
|
||||
>1</SPAN
|
||||
>. We use a <TT
|
||||
CLASS="FUNCTION"
|
||||
>while</TT
|
||||
> loop to process each event in turn.
|
||||
<PRE
|
||||
CLASS="PROGRAMLISTING"
|
||||
>while(SDL_PollEvent(&test_event)) {</PRE
|
||||
>
|
||||
The <TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PollEvent</TT
|
||||
> function take a pointer to an <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_Event</SPAN
|
||||
> structure that is to be filled with event information. We know that if <TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PollEvent</TT
|
||||
> removes an event from the queue then the event information will be placed in our <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>test_event</SPAN
|
||||
> structure, but we also know that the <I
|
||||
CLASS="EMPHASIS"
|
||||
>type</I
|
||||
> of event will be placed in the <TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>type</I
|
||||
></TT
|
||||
> member of <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>test_event</SPAN
|
||||
>. So to handle each event <TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>type</I
|
||||
></TT
|
||||
> seperately we use a <TT
|
||||
CLASS="FUNCTION"
|
||||
>switch</TT
|
||||
> statement.
|
||||
<PRE
|
||||
CLASS="PROGRAMLISTING"
|
||||
> switch(test_event.type) {</PRE
|
||||
>
|
||||
We need to know what kind of events we're looking for <I
|
||||
CLASS="EMPHASIS"
|
||||
>and</I
|
||||
> the event <TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>type</I
|
||||
></TT
|
||||
>'s of those events. So lets assume we want to detect where the user is moving the mouse pointer within our application. We look through our event types and notice that <TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_MOUSEMOTION</TT
|
||||
> is, more than likely, the event we're looking for. A little <A
|
||||
HREF="sdlmousemotionevent.html"
|
||||
>more</A
|
||||
> research tells use that <TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_MOUSEMOTION</TT
|
||||
> events are handled within the <A
|
||||
HREF="sdlmousemotionevent.html"
|
||||
><SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_MouseMotionEvent</SPAN
|
||||
></A
|
||||
> structure which is the <TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>motion</I
|
||||
></TT
|
||||
> member of <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>SDL_Event</SPAN
|
||||
>. We can check for the <TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_MOUSEMOTION</TT
|
||||
> event <TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>type</I
|
||||
></TT
|
||||
> within our <TT
|
||||
CLASS="FUNCTION"
|
||||
>switch</TT
|
||||
> statement like so:
|
||||
<PRE
|
||||
CLASS="PROGRAMLISTING"
|
||||
> case SDL_MOUSEMOTION:</PRE
|
||||
>
|
||||
All we need do now is read the information out of the <TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>motion</I
|
||||
></TT
|
||||
> member of <SPAN
|
||||
CLASS="STRUCTNAME"
|
||||
>test_event</SPAN
|
||||
>.
|
||||
<PRE
|
||||
CLASS="PROGRAMLISTING"
|
||||
> printf("We got a motion event.\n");
|
||||
printf("Current mouse position is: (%d, %d)\n", test_event.motion.x, test_event.motion.y);
|
||||
break;
|
||||
default:
|
||||
printf("Unhandled Event!\n");
|
||||
break;
|
||||
}
|
||||
}
|
||||
printf("Event queue empty.\n");</PRE
|
||||
></P
|
||||
><P
|
||||
>It is also possible to push events onto the event queue and so use it as a two-way communication path. Both <A
|
||||
HREF="sdlpushevent.html"
|
||||
><TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PushEvent</TT
|
||||
></A
|
||||
> and <A
|
||||
HREF="sdlpeepevents.html"
|
||||
><TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PeepEvents</TT
|
||||
></A
|
||||
> allow you to place events onto the event queue. This is usually used to place a <TT
|
||||
CLASS="LITERAL"
|
||||
>SDL_USEREVENT</TT
|
||||
> on the event queue, however you could use it to post fake input events if you wished. Creating your own events is a simple matter of choosing the event type you want, setting the <TT
|
||||
CLASS="STRUCTFIELD"
|
||||
><I
|
||||
>type</I
|
||||
></TT
|
||||
> member and filling the appropriate member structure with information.
|
||||
<PRE
|
||||
CLASS="PROGRAMLISTING"
|
||||
>SDL_Event user_event;
|
||||
|
||||
user_event.type=SDL_USEREVENT;
|
||||
user_event.user.code=2;
|
||||
user_event.user.data1=NULL;
|
||||
user_event.user.data2=NULL;
|
||||
SDL_PushEvent(&user_event);</PRE
|
||||
></P
|
||||
></DIV
|
||||
><DIV
|
||||
CLASS="REFSECT1"
|
||||
><A
|
||||
NAME="AEN3434"
|
||||
></A
|
||||
><H2
|
||||
>See Also</H2
|
||||
><P
|
||||
><A
|
||||
HREF="sdlpollevent.html"
|
||||
><TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PollEvent</TT
|
||||
></A
|
||||
>,
|
||||
<A
|
||||
HREF="sdlpushevent.html"
|
||||
><TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PushEvent</TT
|
||||
></A
|
||||
>,
|
||||
<A
|
||||
HREF="sdlpeepevents.html"
|
||||
><TT
|
||||
CLASS="FUNCTION"
|
||||
>SDL_PeepEvents</TT
|
||||
></A
|
||||
></P
|
||||
></DIV
|
||||
><DIV
|
||||
CLASS="NAVFOOTER"
|
||||
><HR
|
||||
ALIGN="LEFT"
|
||||
WIDTH="100%"><TABLE
|
||||
WIDTH="100%"
|
||||
BORDER="0"
|
||||
CELLPADDING="0"
|
||||
CELLSPACING="0"
|
||||
><TR
|
||||
><TD
|
||||
WIDTH="33%"
|
||||
ALIGN="left"
|
||||
VALIGN="top"
|
||||
><A
|
||||
HREF="eventstructures.html"
|
||||
>Prev</A
|
||||
></TD
|
||||
><TD
|
||||
WIDTH="34%"
|
||||
ALIGN="center"
|
||||
VALIGN="top"
|
||||
><A
|
||||
HREF="index.html"
|
||||
>Home</A
|
||||
></TD
|
||||
><TD
|
||||
WIDTH="33%"
|
||||
ALIGN="right"
|
||||
VALIGN="top"
|
||||
><A
|
||||
HREF="sdlactiveevent.html"
|
||||
>Next</A
|
||||
></TD
|
||||
></TR
|
||||
><TR
|
||||
><TD
|
||||
WIDTH="33%"
|
||||
ALIGN="left"
|
||||
VALIGN="top"
|
||||
>SDL Event Structures.</TD
|
||||
><TD
|
||||
WIDTH="34%"
|
||||
ALIGN="center"
|
||||
VALIGN="top"
|
||||
><A
|
||||
HREF="eventstructures.html"
|
||||
>Up</A
|
||||
></TD
|
||||
><TD
|
||||
WIDTH="33%"
|
||||
ALIGN="right"
|
||||
VALIGN="top"
|
||||
>SDL_ActiveEvent</TD
|
||||
></TR
|
||||
></TABLE
|
||||
></DIV
|
||||
></BODY
|
||||
></HTML
|
||||
>
|
||||
Loading…
Add table
Add a link
Reference in a new issue