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<HTML><HEAD><TITLE>Xlib Programming Manual: Key Map State Notification Events</TITLE></HEAD><BODY><H1 ALIGN=center>10.8 Key Map State Notification Events</H1><A NAME="KeymapNotify"></A><!.IN "Events" "KeymapNotify"><!.IN "KeymapNotify" "" "@DEF@">The X server can report<B>KeymapNotify</B>events to clients that want information about changes in their keyboard state.<P>To receive<B>KeymapNotify</B>events, set the<B>KeymapStateMask</B>bit in the <A HREF="../window/attributes/event-and-do-not-propagate.html">event-mask</A> attribute of the window. The X server generates this event immediately after every<B><A HREF="window-entry-exit/">EnterNotify</A></B>and<B><A HREF="input-focus/">FocusIn</A></B>event.<P>The structure for this event type contains:<A NAME="XKeymapEvent"></A><P><!.IN "XKeymapEvent" "" "@DEF@"><CODE><PRE>/* generated on EnterWindow and FocusIn when KeymapState selected */typedef struct { int type; /* KeymapNotify */ unsigned long serial; /* # of last request processed by server */ Bool send_event; /* true if this came from a <B><A HREF="../appendix/a.html#SendEvent">SendEvent</A></B> request */ Display *display; /* Display the event was read from */ Window window; char key_vector[32];} XKeymapEvent; </PRE></CODE><P>The <B>window</B> member is not used but is present to aid some toolkits.The <B>key_vector</B> member is set to the bit vector of the keyboard.Each bit set to 1 indicates that the corresponding key is currently pressed.The vector is represented as 32 bytes.Byte N (from 0) contains the bits for keys 8N to 8N + 7 with the least-significant bit in the byte representing key 8N.<H5 ALIGN=right><I>Next: <A HREF="exposure/">Exposure events</A></I></H5><HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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