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<HTML><HEAD><TITLE>Xlib Programming Manual: MapRequest Events</TITLE></HEAD><BODY><H1 ALIGN=center>10.11.3 MapRequest Events</H1><!.IN "Events" "MapRequest"><!.IN "MapRequest" "" "@DEF@">The X server can report<B>MapRequest</B>events to clients wanting information about a different client's desire to map windows.A window is considered mapped when a map window request completes.The X server generates this event whenever a different client initiates a map window request on an unmapped window whose override_redirect member is set to<B>False</B> .Clients initiate map window requests by calling<B><A HREF="../../window/XMapWindow.html">XMapWindow()</A></B>,<B><A HREF="../../window/XMapRaised.html">XMapRaised()</A></B>,or<B><A HREF="../../window/XMapSubwindows.html">XMapSubwindows()</A></B>.<P>To receive<B>MapRequest</B>events, set the<B>SubstructureRedirectMask</B>bit in the <A HREF="../../window/attributes/event-and-do-not-propagate.html">event-mask</A> attribute of the window. This means another client's attempts to map a child window by calling one ofthe map window request functions is intercepted, and you are sent a <B>MapRequest</B>instead.For example, suppose a client application calls<B><A HREF="../../window/XMapWindow.html">XMapWindow()</A></B>to map a window.If you (usually a window manager) had selected<B>SubstructureRedirectMask</B>on the parent window and if the <A HREF="../../window/attributes/override-redirect.html">override-redirect</A> attribute of the window is set to<B>False</B>,the X server reports a<B>MapRequest</B>event to you and does not map the specified window.Thus, this event gives your window manager client the ability to control the placement of subwindows.<A NAME="XMapRequestEvent"><P>The structure for this event type contains:<P><!.IN "XMapRequestEvent" "" "@DEF@"><CODE><PRE>typedef struct { int type; /* MapRequest */ 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 parent; Window window;} XMapRequestEvent;</PRE></CODE><P>The <B>parent</B> member is set to the parent window.The <B>window</B> member is set to the window to be mapped.<H5 ALIGN=right><I>Next: <A HREF="resize.html">ResizeRequest 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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