📄 grab-ungrab.html
字号:
<HTML><HEAD><TITLE>Xlib Programming Manual: Grab and Ungrab Entry/Exit Events</TITLE></HEAD><BODY><H1 ALIGN=center>10.6.2 Grab and Ungrab Entry/Exit Events</H1>Pseudo-motion mode<B><A HREF="./">EnterNotify</A></B>and<B><A HREF="./">LeaveNotify</A></B>events are generated when a pointer grab activates or deactivates.Events in which the pointer grab activatesare identified by<A HREF="./#XCrossingEvent">XEnterWindowEvent</A>or<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structures whose <B>mode</B> member is set to <B>NotifyGrab</B>.Events in which the pointer grab deactivatesare identified by<A HREF="./#XCrossingEvent">XEnterWindowEvent</A>or<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structures whose <B>mode</B> member is set to <B>NotifyUngrab</B>(see<B><A HREF="../../window-and-session-manager/XGrabPointer.html">XGrabPointer()</A></B>).<UL><P><LI>When a pointer grab activates after any initial warp into a confine_towindow and before generating any actual<B><A HREF="../keyboard-pointer/keyboard-pointer.html">ButtonPress</A></B> event that activates the grab, G is the grab_window for the grab, and P is the window the pointer is in, the X server does the following:<UL><P><LI>It generates<B><A HREF="./">EnterNotify</A></B>and<B><A HREF="./">LeaveNotify</A></B>events (see "<A HREF="normal.html">Normal Entry/Exit Events</A>")with the <B>mode</B> members of the <A HREF="./#XCrossingEvent">XEnterWindowEvent</A>and<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structures set to <B>NotifyGrab</B>.These events are generatedas if the pointer were to suddenly warp fromits current position in P to some position in G.However, the pointer does not warp, and the X server uses the pointer position as both the initial and final positions for the events.</UL><P><LI>When a pointer grab deactivates after generating any actual<B><A HREF="../keyboard-pointer/keyboard-pointer.html">ButtonRelease</A></B>event that deactivates the grab, G is the grab_window for the grab,and P is the window the pointer is in, the X server does the following:<UL><P><LI>It generates<B><A HREF="./">EnterNotify</A></B>and<B><A HREF="./">LeaveNotify</A></B>events (see "<A HREF="normal.html">Normal Entry/Exit Events</A>")with the <B>mode</B> members of the<A HREF="./#XCrossingEvent">XEnterWindowEvent</A>and<A HREF="./#XCrossingEvent">XLeaveWindowEvent</A>structures set to <B>NotifyUngrab</B>.These events are generated as if the pointer were to suddenly warp fromsome position in G to its current position in P.However, the pointer does not warp, and the X server uses thecurrent pointer position as both theinitial and final positions for the events.</UL></UL><H5 ALIGN=right><I>Next: <A HREF="../input-focus/">Input Focus 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
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -