📄 sdlactiveevent.html

📁 VC5.6.7的一个扩展库。跟DirectX的功能差不多。
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<HTML><HEAD><TITLE>SDL_ActiveEvent</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+"><LINKREL="HOME"TITLE="SDL Library Documentation"HREF="index.html"><LINKREL="UP"TITLE="SDL Event Structures."HREF="eventstructures.html"><LINKREL="PREVIOUS"TITLE="SDL_Event"HREF="sdlevent.html"><LINKREL="NEXT"TITLE="SDL_KeyboardEvent"HREF="sdlkeyboardevent.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFF8DC"TEXT="#000000"LINK="#0000ee"VLINK="#551a8b"ALINK="#ff0000"><DIVCLASS="NAVHEADER"><TABLESUMMARY="Header navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">SDL Library Documentation</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="sdlevent.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom"></TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="sdlkeyboardevent.html"ACCESSKEY="N">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><H1><ANAME="SDLACTIVEEVENT"></A>SDL_ActiveEvent</H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN3955"></A><H2>Name</H2>SDL_ActiveEvent&nbsp;--&nbsp;Application visibility event structure</DIV><DIVCLASS="REFSECT1"><ANAME="AEN3958"></A><H2>Structure Definition</H2><PRECLASS="PROGRAMLISTING">typedef struct{  Uint8 type;  Uint8 gain;  Uint8 state;} SDL_ActiveEvent;</PRE></DIV><DIVCLASS="REFSECT1"><ANAME="AEN3961"></A><H2>Structure Data</H2><DIVCLASS="INFORMALTABLE"><ANAME="AEN3963"></A><P></P><TABLEBORDER="0"CLASS="CALSTABLE"><TBODY><TR><TDALIGN="LEFT"VALIGN="TOP"><TTCLASS="STRUCTFIELD"><I>type</I></TT></TD><TDALIGN="LEFT"VALIGN="TOP"><TTCLASS="LITERAL">SDL_ACTIVEEVENT.</TT></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"><TTCLASS="STRUCTFIELD"><I>gain</I></TT></TD><TDALIGN="LEFT"VALIGN="TOP">0 if the event is a loss or 1 if it is a gain.</TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"><TTCLASS="STRUCTFIELD"><I>state</I></TT></TD><TDALIGN="LEFT"VALIGN="TOP"><TTCLASS="LITERAL">SDL_APPMOUSEFOCUS</TT> if mouse focus was gained or lost, <TTCLASS="LITERAL">SDL_APPINPUTFOCUS</TT> if input focus was gained or lost, or <TTCLASS="LITERAL">SDL_APPACTIVE</TT> if the application was iconified (<TTCLASS="STRUCTFIELD"><I>gain</I></TT>=0) or restored(<TTCLASS="STRUCTFIELD"><I>gain</I></TT>=1).</TD></TR></TBODY></TABLE><P></P></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN3984"></A><H2>Description</H2><P><SPANCLASS="STRUCTNAME">SDL_ActiveEvent</SPAN> is a member of the <AHREF="sdlevent.html"><SPANCLASS="STRUCTNAME">SDL_Event</SPAN></A> union and is used when an event of type <TTCLASS="LITERAL">SDL_ACTIVEEVENT</TT> is reported.</P><P>When the mouse leaves or enters the window area a <TTCLASS="LITERAL">SDL_APPMOUSEFOCUS</TT> type activation event occurs, if the mouse entered the window then <TTCLASS="STRUCTFIELD"><I>gain</I></TT> will be 1, otherwise <TTCLASS="STRUCTFIELD"><I>gain</I></TT> will be 0. A <TTCLASS="LITERAL">SDL_APPINPUTFOCUS</TT> type activation event occurs when the application loses or gains keyboard focus. This usually occurs when another application is made active. Finally, a <TTCLASS="LITERAL">SDL_APPACTIVE</TT> type event occurs when the application is either minimised/iconified (<TTCLASS="STRUCTFIELD"><I>gain</I></TT>=0) or restored.</P><DIVCLASS="NOTE"><BLOCKQUOTECLASS="NOTE"><P><B>Note: </B>This event does not occur when an application window is first created.</P></BLOCKQUOTE></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN4000"></A><H2>See Also</H2><P><AHREF="sdlevent.html"><SPANCLASS="STRUCTNAME">SDL_Event</SPAN></A>,<AHREF="sdlgetappstate.html"><TTCLASS="FUNCTION">SDL_GetAppState</TT></A></P></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLESUMMARY="Footer navigation table"WIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="sdlevent.html"ACCESSKEY="P">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="index.html"ACCESSKEY="H">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="sdlkeyboardevent.html"ACCESSKEY="N">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">SDL_Event</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="eventstructures.html"ACCESSKEY="U">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">SDL_KeyboardEvent</TD></TR></TABLE></DIV></BODY></HTML>
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