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<HTML><HEAD><TITLE>Xlib Programming Manual: PropertyNotify Events</TITLE></HEAD><BODY><H1 ALIGN=center>10.13.2 PropertyNotify Events</H1><!.IN "Events" "PropertyNotify"><!.IN "PropertyNotify" "" "@DEF@">The X server can report<B>PropertyNotify</B>events to clients wanting information about property changes for a specified window.<P>To receive<B>PropertyNotify</B>events, set the<B>PropertyChangeMask</B>bit in the <A HREF="../../window/attributes/event-and-do-not-propagate.html">event-mask</A> attribute of the window. <A NAME="XPropertyEvent"></A><P>The structure for this event type contains:<P><!.IN "XPropertyEvent" "" "@DEF@"><PRE><CODE>typedef struct { int type; /* PropertyNotify */ unsigned long serial; /* # of last request processed by server */ Bool send_event; /* true if this came from a <B><A HREF="../../appendix/a.html#SendEvent">SendEvent</A></B> request */ Display *display; /* Display the event was read from */ Window window; Atom atom; Time time; int state; /* PropertyNewValue or PropertyDelete */} XPropertyEvent;</PRE></CODE><P>The <B>window</B> member is set to the window whose associated property was changed.The <B>atom</B> member is set to the property's atom and indicates whichproperty was changed or desired.The <B>time</B> member is set to the server time when the property was changed.The <B>state</B> member is set to indicate whether the property was changed to a new value or deleted and can be<B>PropertyNewValue</B>or<B>PropertyDelete</B>.The <B>state</B> member is set to<B>PropertyNewValue</B>when a property of the window is changed using<B><A HREF="../../window-information/XChangeProperty.html">XChangeProperty()</A></B>or<B><A HREF="../../window-information/XRotateWindowProperties.html">XRotateWindowProperties()</A></B>(even when adding zero-length data using<B><A HREF="../../window-information/XChangeProperty.html">XChangeProperty()</A></B>)and when replacing all or part of a property with identical data using<B><A HREF="../../window-information/XChangeProperty.html">XChangeProperty()</A></B>or <B><A HREF="../../window-information/XRotateWindowProperties.html">XRotateWindowProperties()</A></B>.The <B>state</B> member is set to<B>PropertyDelete</B>when a property of the window is deleted using<B><A HREF="../../window-information/XDeleteProperty.html">XDeleteProperty()</A></B>or, if the delete argument is <B>True</B>,<B><A HREF="../../window-information/XGetWindowProperty.html">XGetWindowProperty()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="selection-clear.html">SelectionClear 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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