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<HTML><HEAD><TITLE>Xlib Programming Manual: Normal Focus Events and Focus Events While Grabbed</TITLE></HEAD><BODY><H1 ALIGN=center>10.7.1 Normal Focus Events and Focus Events While Grabbed</H1>Normal focus events are identified by<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>or<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structures whose <B>mode</B> member is set to <B>NotifyNormal</B>.Focus events while grabbed are identified by<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>or<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structures whose <B>mode</B> member is set to <B>NotifyWhileGrabbed</B>.The X server processes normal focus and focus events while grabbed according to the following:<UL><P><LI>When the focus moves from window A to window B, A is an inferior of B, and the pointer is in window P, the X server does the following:<UL><P><LI>It generates a<B><A HREF="./">FocusOut</A></B>event on window A, with the detail member of the<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyAncestor</B>. <P><LI>It generates a<B><A HREF="./">FocusOut</A></B>event on each window between window A and window B, exclusive,with the <B>detail</B> member of each<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyVirtual</B>.<P><LI>It generates a<B><A HREF="./">FocusIn</A></B>event on window B, with the <B>detail</B> member of the <A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyInferior</B>.<P><LI>If window P is an inferior of window Bbut window P is not window A or an inferior or ancestor of window A,it generates a<B><A HREF="./">FocusIn</A></B>event on each window below window B, down to and including window P, with the <B>detail</B> member of each <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyPointer</B>.</UL><P><LI>When the focus moves from window A to window B, B is an inferior of A, and the pointer is in window P, the X server does the following:<UL><P><LI>If window P is an inferior of window Abut P is not an inferior of window B or an ancestor of B,it generates a<B><A HREF="./">FocusOut</A></B>event on each window from window P up to but not including window A,with the <B>detail</B> member of each <A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyPointer</B>.<P><LI>It generates a<B><A HREF="./">FocusOut</A></B>event on window A,with the <B>detail</B> member of the<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyInferior</B>. <P><LI>It generates a<B><A HREF="./">FocusIn</A></B>event on each window between window A and window B, exclusive, with the <B>detail</B> member of each <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyVirtual</B>. <P><LI>It generates a<B><A HREF="./">FocusIn</A></B>event on window B, with the <B>detail</B> member of the <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyAncestor</B>.</UL><P><LI>When the focus moves from window A to window B, window C is their least common ancestor, and the pointer is in window P, the X server does the following:<UL><P><LI>If window P is an inferior of window A,it generates a<B><A HREF="./">FocusOut</A></B>event on each window from window P up to but not including window A, with the <B>detail</B> member of the <A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyPointer</B>.<P><LI>It generates a<B><A HREF="./">FocusOut</A></B>event on window A,with the <B>detail</B> member of the<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyNonlinear</B>.<P><LI>It generates a<B><A HREF="./">FocusOut</A></B>event on each window between window A and window C, exclusive,with the <B>detail</B> member of each<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyNonlinearVirtual</B>.<P><LI>It generates a<B><A HREF="./">FocusIn</A></B>event on each window between C and B, exclusive,with the <B>detail</B> member of each<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyNonlinearVirtual</B>.<P><LI>It generates a<B><A HREF="./">FocusIn</A></B>event on window B, with the <B>detail</B> member of the <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyNonlinear</B>.<P><LI>If window P is an inferior of window B, it generates a<B><A HREF="./">FocusIn</A></B>event on each window below window B down to and including window P, with the <B>detail</B> member of the <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyPointer</B>.</UL><P><LI>When the focus moves from window A to window B on different screens and the pointer is in window P, the X server does the following:<UL><P><LI>If window P is an inferior of window A, it generates a<B><A HREF="./">FocusOut</A></B>event on each window from window P up to but not including window A, with the <B>detail</B> member of each <A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyPointer</B> .<P><LI>It generates a<B><A HREF="./">FocusOut</A></B>event on window A,with the <B>detail</B> member of the<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyNonlinear</B>.<P><LI>If window A is not a root window,it generates a<B><A HREF="./">FocusOut</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="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyNonlinearVirtual</B>.<P><LI>If window B is not a root window,it generates a<B><A HREF="./">FocusIn</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="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyNonlinearVirtual</B>.<P><LI>It generates a<B><A HREF="./">FocusIn</A></B>event on window B, with the <B>detail</B> member of each <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyNonlinear</B>.<P><LI>If window P is an inferior of window B, it generates a<B><A HREF="./">FocusIn</A></B>event on each window below window B down to and including window P, with the <B>detail</B> member of each <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyPointer</B>.</UL><P><LI>When the focus moves from window A to <B>PointerRoot</B>(events sent to the window under the pointer)or<B>None</B> (discard), and the pointer is in window P,the X server does the following:<UL><P><LI>If window P is an inferior of window A, it generates a<B><A HREF="./">FocusOut</A></B>event on each window from window P up to but not including window A, with the <B>detail</B> member of each <A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to <B>NotifyPointer</B>.<P><LI>It generates a<B><A HREF="./">FocusOut</A></B>event on window A, with the detail member of the<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to<B>NotifyNonlinear</B>.<P><LI>If window A is not a root window,it generates a<B><A HREF="./">FocusOut</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="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to<B>NotifyNonlinearVirtual</B>.<P><LI>It generates a<B><A HREF="./">FocusIn</A></B>event on the root window of all screens, with the <B>detail</B> member of each<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to<B>NotifyPointerRoot</B>(or<B>NotifyDetailNone</B>).<P><LI>If the new focus is<B>PointerRoot</B>,it generates a<B><A HREF="./">FocusIn</A></B>event on each window from window P's root down to and including window P, with the <B>detail</B> member of each<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to<B>NotifyPointer</B>.</UL><P><LI>When the focus moves from <B>PointerRoot</B>(events sent to the window under the pointer)or<B>None</B> to window A, and the pointer is in window P, the X server does the following: <UL><P><LI>If the old focus is<B>PointerRoot</B>,it generates a<B><A HREF="./">FocusOut</A></B>event on each window from window P up to and including window P's root, with the <B>detail</B> member of each<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to<B>NotifyPointer</B> .<P><LI>It generates a<B><A HREF="./">FocusOut</A></B>event on all root windows,with the detail member of each<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to<B>NotifyPointerRoot</B>(or<B>NotifyDetailNone</B>).<P><LI>If window A is not a root window,it generates a<B><A HREF="./">FocusIn</A></B>event on each window from window A's root down to but not including window A,with the <B>detail</B>member of each<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to<B>NotifyNonlinearVirtual</B>.<P><LI>It generates a<B><A HREF="./">FocusIn</A></B>event on window A,with the <B>detail</B> member of the <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyNonlinear</B>.<P><LI>If window P is an inferior of window A, it generates a<B><A HREF="./">FocusIn</A></B>event on each window below window A down to and including window P, with the <B>detail</B> member of each <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to <B>NotifyPointer</B>.</UL><P><LI>When the focus moves from <B>PointerRoot</B>(events sent to the window under the pointer)to<B>None</B>(or vice versa), and the pointer is in window P, the X server does the following:<UL><P><LI>If the old focus is<B>PointerRoot</B> ,it generates a<B><A HREF="./">FocusOut</A></B>event on each window from window P up to and including window P's root, with the <B>detail</B> member of each<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to<B>NotifyPointer</B>.<P><LI>It generates a<B><A HREF="./">FocusOut</A></B>event on all root windows,with the <B>detail</B> member of each <A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structure set to either<B>NotifyPointerRoot</B>or<B>NotifyDetailNone</B>. <P><LI>It generates a<B><A HREF="./">FocusIn</A></B>event on all root windows,with the <B>detail</B> member of each<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to<B>NotifyDetailNone</B> or<B>NotifyPointerRoot</B>.<P><LI>If the new focus is<B>PointerRoot</B>,it generates a<B><A HREF="./">FocusIn</A></B>event on each window from window P's root down to and including window P, with the <B>detail</B> member of each<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>structure set to<B>NotifyPointer</B>.</UL></UL><H5 ALIGN=right><I>Next: <A HREF="grab.html">Focus Events Generated by Grabs</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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