NAME

       XVisibilityEvent - VisibilityNotify event structure

STRUCTURES

       The structure for VisibilityNotify events contains:

       typedef struct {
               int type;       /* VisibilityNotify */
               unsigned long serial;   /* # of last request processed by server */
               Bool send_event;        /* true if this came from a SendEvent request */
               Display *display;       /* Display the event was read from */
               Window window;
               int state;
       } XVisibilityEvent;

       When you receive this event, the structure members are set as follows.

       The  type  member is set to the event type constant name that uniquely identifies it.  For
       example, when the X server reports a GraphicsExpose event  to  a  client  application,  it
       sends  an  XGraphicsExposeEvent structure with the type member set to GraphicsExpose.  The
       display member is set to a pointer to the display the event was read on.   The  send_event
       member  is  set  to  True if the event came from a SendEvent protocol request.  The serial
       member is set from the serial number reported in the protocol but expanded from the 16-bit
       least-significant  bits  to  a  full 32-bit value.  The window member is set to the window
       that is most useful to toolkit dispatchers.

       The window member is set to the window whose visibility state changes.  The  state  member
       is  set  to  the  state  of  the  window's  visibility  and  can  be VisibilityUnobscured,
       VisibilityPartiallyObscured, or VisibilityFullyObscured.  The X server ignores  all  of  a
       window's  subwindows  when  determining  the  visibility state of the window and processes
       VisibilityNotify events according to the following:

       •    When the window changes  state  from  partially  obscured,  fully  obscured,  or  not
            viewable to viewable and completely unobscured, the X server generates the event with
            the state member of the XVisibilityEvent structure set to VisibilityUnobscured.

       •    When the window changes state from viewable and completely unobscured or not viewable
            to  viewable  and partially obscured, the X server generates the event with the state
            member of the XVisibilityEvent structure set to VisibilityPartiallyObscured.

       •    When the window changes state from viewable and completely unobscured,  viewable  and
            partially  obscured,  or  not  viewable  to viewable and fully obscured, the X server
            generates the event with the state member of the XVisibilityEvent  structure  set  to
            VisibilityFullyObscured.

SEE ALSO

       XAnyEvent(3),       XButtonEvent(3),       XCreateWindowEvent(3),      XCirculateEvent(3),
       XCirculateRequestEvent(3),             XColormapEvent(3),              XConfigureEvent(3),
       XConfigureRequestEvent(3),   XCrossingEvent(3),   XDestroyWindowEvent(3),  XErrorEvent(3),
       XExposeEvent(3),    XFocusChangeEvent(3),    XGraphicsExposeEvent(3),    XGravityEvent(3),
       XKeymapEvent(3),  XMapEvent(3), XMapRequestEvent(3), XPropertyEvent(3), XReparentEvent(3),
       XResizeRequestEvent(3),            XSelectionClearEvent(3),            XSelectionEvent(3),
       XSelectionRequestEvent(3), XUnmapEvent(3),
       Xlib - C Language X Interface