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<HTML><HEAD><TITLE>Xlib Programming Manual: Focus Events Generated by Grabs</TITLE></HEAD><BODY><H1 ALIGN=center>10.7.2 Focus Events Generated by Grabs</H1>Focus events in which the keyboard grab activatesare identified by<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>or<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structures whose <B>mode</B> member is set to <B>NotifyGrab</B>.Focus events in which the keyboard grab deactivatesare identified by<A HREF="./#XFocusChangeEvent">XFocusInEvent</A>or<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structures whose <B>mode</B> member is set to <B>NotifyUngrab</B> (see <B><A HREF="../../input/XGrabKeyboard.html">XGrabKeyboard()</A></B>).<UL><P><LI>When a keyboard grab activates before generating any actual <B><A HREF="../keyboard-pointer/keyboard-pointer.html">KeyPress</A></B>event that activates the grab,G is the grab_window, and F is the current focus, the X server does the following:<UL><P><LI>It generates <B><A HREF="./">FocusIn</A></B>and<B><A HREF="./">FocusOut</A></B>events, with the <B>mode</B> members of the <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>and<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structures set to <B>NotifyGrab</B>.These events are generatedas if the focus were to change fromF to G.</UL><P><LI>When a keyboard grab deactivates after generating any actual<B><A HREF="../keyboard-pointer/keyboard-pointer.html">KeyRelease</A></B>event that deactivates the grab,G is the grab_window, and F is the current focus,the X server does the following:<UL><P><LI>It generates <B><A HREF="./">FocusIn</A></B>and<B><A HREF="./">FocusOut</A></B>events, with the <B>mode</B> members of the <A HREF="./#XFocusChangeEvent">XFocusInEvent</A>and<A HREF="./#XFocusChangeEvent">XFocusOutEvent</A>structures set to<B>NotifyUngrab</B>.These events are generatedas if the focus were to change fromG to F.</UL></UL><H5 ALIGN=right><I>Next: <A HREF="../key-map.html">Key Map State Notification 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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