Tribblix: manual page: XVisibilityEvent.3

XVisibilityEvent(3) XLIB FUNCTIONS XVisibilityEvent(3)

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:

+o 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.

+o 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.

+o 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.

NAME

STRUCTURES

SEE ALSO