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<HTML><HEAD><TITLE>Xlib Programming Manual: XMapWindow</TITLE></HEAD><BODY><H1 ALIGN=center>XMapWindow</H1><H2>Syntax</H2><!.IN "XMapWindow" "" "@DEF@"><CODE><PRE>XMapWindow(<B>display</B>, <B>w</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; <A HREF="./">Window</A> <B>w</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>w</B><TD> Specifies the window.</TABLE><H2>Description</H2>The<B>XMapWindow()</B>functionmaps the window and all of itssubwindows that have had map requests.Mapping a window that has an unmapped ancestor does not display thewindow but marks it as eligible for display when the ancestor becomesmapped.Such a window is called unviewable.When all its ancestors are mapped,the window becomes viewableand will be visible on the screen if it is not obscured by another window.This function has no effect if the window is already mapped.<P>If the override-redirect of the window is<B>False</B>and if some other client has selected<B><A HREF="../events/processing-overview.html#SubstructureRedirectMask">SubstructureRedirectMask</A></B>on the parent window, then the X server generates a<B><A HREF="../events/structure-control/map.html">MapRequest</A></B>event, and the<B>XMapWindow()</B>function does not map the window.Otherwise, the window is mapped, and the X server generates a<B><A HREF="../events/window-state-change/map.html">MapNotify</A></B>event.<P>If the window becomes viewable and no earlier contents for it are remembered,the X server tiles the window with its background.If the window's background is undefined,the existing screen contents are notaltered, and the X server generates zero or more <B><A HREF="../events/exposure/expose.html">Expose</A></B>events.If backing-store was maintained while the window was unmapped, no <B><A HREF="../events/exposure/expose.html">Expose</A></B>eventsare generated.If backing-store will now be maintained, a full-window exposure is always generated.Otherwise, only visible regions may be reported.Similar tiling and exposure take place for any newly viewable inferiors.<P><!.IN "XMapWindow">If the window is an<B><A HREF="create.html#InputClass">InputOutput</A></B> window,<B>XMapWindow()</B>generates <B><A HREF="../events/exposure/expose.html">Expose</A></B> events on each <B><A HREF="create.html#InputClass">InputOutput</A></B>window that it causes to be displayed.If the client maps and paints the window and if the client begins processing events, the window is painted twice.To avoid this,first ask for <B><A HREF="../events/exposure/expose.html">Expose</A></B> events and then map the window,so the client processes input events as usual.The event list will include <B><A HREF="../events/exposure/expose.html">Expose</A></B> for eachwindow that has appeared on the screen. The client's normal response toan <B><A HREF="../events/exposure/expose.html">Expose</A></B> event should be to repaint the window.This method usually leads to simpler programs and to proper interactionwith window managers.<P><B>XMapWindow()</B>can generate a<B>BadWindow</B>error.<H2>Diagnostics</H2><TABLE><TR><TD><B>BadWindow</B><TD>A value for a Window argument does not name a defined Window.</TABLE><H2>See also</H2><B><A HREF="XChangeWindowAttributes.html">XChangeWindowAttributes()</A></B>,<B><A HREF="XConfigureWindow.html">XConfigureWindow()</A></B>,<B><A HREF="XCreateWindow.html">XCreateWindow()</A></B>,<B><A HREF="XDestroyWindow.html">XDestroyWindow()</A></B>,<B><A HREF="XMapRaised.html">XMapRaised()</A></B>,<B><A HREF="XMapSubwindows.html">XMapSubwindows()</A></B>,<B><A HREF="XUnmapWindow.html">XUnmapWindow()</A></B>,"<A HREF="map.html">Mapping Windows</A>"<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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