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<HTML><HEAD><TITLE>Xlib Programming Manual: Event Masks</TITLE></HEAD><BODY><H1 ALIGN=center>10.3 Event Masks</H1><!.IN "Event mask" "" "@DEF@">Clients select event reporting of most events relative to a window.To do this, pass an event mask to an Xlib event-handlingfunction that takes an event_mask argument.The bits of the event mask are defined in<B><TT>X11/X.h</TT></B>.Each bit in the event mask maps to an event mask name,which describes the event or events you want the X server toreturn to a client application.<P>Unless the client has specifically asked for them,most events are not reported to clients when they are generated. Unless the client suppresses them by setting graphics-exposures in the <A HREF="../GC/manipulating.html">GC</A> to<B>False</B> ,<B><A HREF="exposure/graphics-expose-and-no-expose.html">GraphicsExpose</A></B> and <B><A HREF="exposure/graphics-expose-and-no-expose.html">NoExpose</A></B> are reported by default as a result of<B><A HREF="../graphics/XCopyPlane.html">XCopyPlane()</A></B>and<B><A HREF="../graphics/XCopyArea.html">XCopyArea()</A></B>.<B><A HREF="client-communication/selection-clear.html">SelectionClear</A></B>,<B><A HREF="client-communication/selection-request.html">SelectionRequest</A></B>,<B><A HREF="client-communication/selection.html">SelectionNotify</A></B>,or<B><A HREF="client-communication/client-message.html">ClientMessage</A></B>cannot be masked.Selection related events are only sent to clients cooperatingwith selections (see section "<A HREF="../window-information/selection.html">Selections</A>").When the keyboard or pointer mapping is changed,<B><A HREF="window-state-change/mapping.html">MappingNotify</A></B>is always sent to clients.<P>The following table lists the event mask constants you can pass tothe event_mask argument andthe circumstances in which you would want to specify theevent mask:<A NAME="NoEventMask"></A><TABLE><TR><TD COLSPAN=2><HR><TR><TD><B>Event Mask <TD><B>Circumstances<TR><TD COLSPAN=2><HR><TR><TD><B>NoEventMask</B> <TD>No events wanted<TR><TD><B><A HREF="processing-overview.html#KeyPressMask">KeyPressMask</A></B> <TD>Keyboard down events wanted<TR><TD><B><A HREF="processing-overview.html#KeyReleaseMask">KeyReleaseMask</A></B> <TD>Keyboard up events wanted<TR><TD><B><A HREF="processing-overview.html#ButtonPressMask">ButtonPressMask</A></B> <TD>Pointer button down events wanted<TR><TD><B><A HREF="processing-overview.html#ButtonReleaseMask">ButtonReleaseMask</A></B> <TD>Pointer button up events wanted<TR><TD><B><A HREF="processing-overview.html#EnterWindowMask">EnterWindowMask</A></B> <TD>Pointer window entry events wanted<TR><TD><B><A HREF="processing-overview.html#LeaveWindowMask">LeaveWindowMask</A></B> <TD>Pointer window leave events wanted<TR><TD><B><A HREF="processing-overview.html#PointerMotionMask">PointerMotionMask</A></B> <TD>Pointer motion events wanted<TR><TD><B><A HREF="processing-overview.html#PointerMotionHintMask">PointerMotionHintMask</A></B> <TD>Pointer motion hints wanted<TR><TD><B><A HREF="processing-overview.html#Button1MotionMask">Button1MotionMask</A></B> <TD>Pointer motion while button 1 down<TR><TD><B><A HREF="processing-overview.html#Button2MotionMask">Button2MotionMask</A></B> <TD>Pointer motion while button 2 down<TR><TD><B><A HREF="processing-overview.html#Button3MotionMask">Button3MotionMask</A></B> <TD>Pointer motion while button 3 down<TR><TD><B><A HREF="processing-overview.html#Button4MotionMask">Button4MotionMask</A></B> <TD>Pointer motion while button 4 down<TR><TD><B><A HREF="processing-overview.html#Button5MotionMask">Button5MotionMask</A></B> <TD>Pointer motion while button 5 down<TR><TD><B><A HREF="processing-overview.html#ButtonMotionMask">ButtonMotionMask</A></B> <TD>Pointer motion while any button down<TR><TD><B><A HREF="processing-overview.html#KeymapStateMask">KeymapStateMask</A></B> <TD>Keyboard state wanted at window entry and focus in<TR><TD><B><A HREF="processing-overview.html#ExposureMask">ExposureMask</A></B> <TD>Any exposure wanted<TR><TD><B><A HREF="processing-overview.html#VisibilityChangeMask">VisibilityChangeMask</A></B> <TD>Any change in visibility wanted<TR><TD><B><A HREF="processing-overview.html#StructureNotifyMask">StructureNotifyMask</A></B> <TD>Any change in window structure wanted<TR><TD><B><A HREF="processing-overview.html#ResizeRedirectMask">ResizeRedirectMask</A></B> <TD>Redirect resize of this window<TR><TD><B><A HREF="processing-overview.html#SubstructureNotifyMask">SubstructureNotifyMask</A></B> <TD>Substructure notification wanted<TR><TD><B><A HREF="processing-overview.html#SubstructureRedirectMask">SubstructureRedirectMask</A></B> <TD>Redirect structure requests on children<TR><TD><B><A HREF="processing-overview.html#FocusChangeMask">FocusChangeMask</A></B> <TD>Any change in input focus wanted<TR><TD><B><A HREF="processing-overview.html#PropertyChangeMask">PropertyChangeMask</A></B> <TD>Any change in property wanted<TR><TD><B><A HREF="processing-overview.html#ColormapChangeMask">ColormapChangeMask</A></B> <TD>Any change in colormap wanted<TR><TD><B><A HREF="processing-overview.html#OwnerGrabButtonMask">OwnerGrabButtonMask</A></B> <TD>Automatic grabs should activate with owner_events set to <B>True</B><TR><TD COLSPAN=2><HR></TABLE><H5 ALIGN=right><I>Next: <A HREF="processing-overview.html">Event Processing Overview</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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