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<HTML><HEAD><TITLE>Xlib Programming Manual: Normal Entry/Exit Events</TITLE></HEAD><BODY><H1 ALIGN=center>10.6.1 Normal Entry/Exit Events</H1><B><A HREF="./">EnterNotify</A></B>and<B><A HREF="./">LeaveNotify</A></B>events are generated when the pointer moves fromone window to another window.Normal events are identified by<A HREF="./#XCrossingEvent">XEnterWindowEvent</A>or<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structures whose mode member is set to<B>NotifyNormal</B>.<UL><P><LI>When the pointer moves from window A to window B and A is an inferior of B, the X server does the following:<UL><P><LI>It generates a<B><A HREF="./">LeaveNotify</A></B>event on window A, with the <B>detail</B> member of the<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structure set to<B>NotifyAncestor</B>.<P><LI>It generates a<B><A HREF="./">LeaveNotify</A></B>event on each window between window A and window B, exclusive,with the <B>detail</B> member of each<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structure set to<B>NotifyVirtual</B>.<P><LI>It generates an<B><A HREF="./">EnterNotify</A></B>event on window B, with the <B>detail</B> member of the <A HREF="./#XCrossingEvent">XEnterWindowEvent</A>structure set to<B>NotifyInferior</B>.</UL><P><LI>When the pointer moves from window A to window B and B is an inferior of A,the X server does the following:<UL><P><LI>It generates a<B><A HREF="./">LeaveNotify</A></B>event on window A,with the <B>detail</B> member of the<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structure set to<B>NotifyInferior</B>.<P><LI>It generates an<B><A HREF="./">EnterNotify</A></B>event on each window between window A and window B, exclusive, with the <B>detail</B> member of each <A HREF="./#XCrossingEvent">XEnterWindowEvent</A>structure set to<B>NotifyVirtual</B>. <P><LI>It generates an<B><A HREF="./">EnterNotify</A></B>event on window B, with the <B>detail</B> member of the <A HREF="./#XCrossingEvent">XEnterWindowEvent</A>structure set to<B>NotifyAncestor</B>.</UL><P><LI>When the pointer moves from window A to window B and window C is their least common ancestor, the X server does the following:<UL><P><LI>It generates a<B><A HREF="./">LeaveNotify</A></B>event on window A,with the <B>detail</B> member of the<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structure set to <B>NotifyNonlinear</B>.<P><LI>It generates a<B><A HREF="./">LeaveNotify</A></B>event on each window between window A and window C, exclusive,with the <B>detail</B> member of each<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structure set to<B>NotifyNonlinearVirtual</B>.<P><LI>It generates an<B><A HREF="./">EnterNotify</A></B>event on each window between window C and window B, exclusive, with the <B>detail</B> member of each<A HREF="./#XCrossingEvent">XEnterWindowEvent</A>structure set to<B>NotifyNonlinearVirtual</B>.<P><LI>It generates an<B><A HREF="./">EnterNotify</A></B>event on window B, with the <B>detail</B> member of the <A HREF="./#XCrossingEvent">XEnterWindowEvent</A>structure set to <B>NotifyNonlinear</B>.</UL><P><LI>When the pointer moves from window A to window B on different screens, the X server does the following:<UL><P><LI>It generates a<B><A HREF="./">LeaveNotify</A></B>event on window A,with the <B>detail</B> member of the<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structure set to <B>NotifyNonlinear</B>.<P><LI>If window A is not a root window,it generates a<B><A HREF="./">LeaveNotify</A></B>event on each window above window A up to and including its root,with the <B>detail</B> member of each<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structure set to <B>NotifyNonlinearVirtual</B>.<P><LI>If window B is not a root window,it generates an<B><A HREF="./">EnterNotify</A></B>event on each window from window B's root down to but not includingwindow B, with the <B>detail</B> member of each<A HREF="./#XCrossingEvent">XEnterWindowEvent</A>structure set to <B>NotifyNonlinearVirtual</B>.<P><LI>It generates an<B><A HREF="./">EnterNotify</A></B>event on window B, with the <B>detail</B> member of the<A HREF="./#XCrossingEvent">XEnterWindowEvent</A>structure set to <B>NotifyNonlinear</B>.</UL></UL><H5 ALIGN=right><I>Next: <A HREF="grab-ungrab.html">Grab and Ungrab Entry/Exit 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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