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<HTML><HEAD><TITLE>Xlib Programming Manual: Events: MapNotify</TITLE><HEAD><BODY><H1 ALIGN=center>10.10.6 MapNotify</H1>The X server can report<B>MapNotify</B>events to clients wanting information about which windows are mapped.The X server generates this event type whenever a client application changes thewindow's state from unmapped to mapped by calling<B><A HREF="../../window/XMapWindow.html">XMapWindow()</A></B>,<B><A HREF="../../window/XMapRaised.html">XMapRaised()</A></B>,<B><A HREF="../../window/XMapSubwindows.html">XMapSubwindows()</A></B>,<B><A HREF="../../window-and-session-manager/XReparentWindow.html">XReparentWindow()</A></B>,or as a result of save-set processing.<H2>Select With</H2>To receive <B>MapNotify</B>events, set the<B>StructureNotifyMask</B>bit in the <A HREF="../../window/attributes/event-and-do-not-propagate.html">event-mask</A> attribute of the window or the<B>SubstructureNotifyMask</B>bit in the <A HREF="../../window/attributes/event-and-do-not-propagate.html">event-mask</A> attribute of the parent window(in which case, mapping any child generates an event).<A NAME="XMapEvent"></A><P>The structure for this event type contains:<P><PRE><CODE>typedef struct { int <B>type</B>; /* MapNotify */ unsigned long <B>serial</B>; /* # of last request processed by server */ Bool <B>send_event</B>; /* true if this came from a <B><A HREF="../../appendix/a.html#SendEvent">SendEvent</A></B> request */ Display *<B>display</B>; /* Display the event was read from */ Window <B>event</B>; Window <B>window</B>; Bool <B>override_redirect</B>; /* boolean, is override set... */} XMapEvent;</PRE></CODE><P>The <B>event</B> member is set either to the window that was mapped or to its parent,depending on whether<B>StructureNotify</B>or<B>SubstructureNotify</B>was selected.<BR>The <B>window</B> member is set to the window that was mapped.<BR>The <B>override_redirect</B> member is set to the override-redirect attributeof the window.Window manager clients normally should ignore this window if the <A HREF="../../window/attributes/override-redirect.html">override-redirect</A> attribute is<B>True</B>,because these events usually are generated from pop-ups,which override structure control.<H5 ALIGN=right><I>Next: <A HREF="mapping.html">MappingNotify 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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