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 struc-
ture 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 re-
quest. 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 use-
ful 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 VisibilityFul-
lyObscured. The X server ignores all of a window's subwindows when de-
termining the visibility state of the window and processes VisibilityNo-
tify events according to the following:
• When the window changes state from partially obscured, fully ob-
scured, or not viewable to viewable and completely unobscured, the
X server generates the event with the state member of the XVisibil-
ityEvent structure set to VisibilityUnobscured.
• When the window changes state from viewable and completely unob-
scured or not viewable to viewable and partially obscured, the X
server generates the event with the state member of the XVisibili-
tyEvent structure set to VisibilityPartiallyObscured.
• When the window changes state from viewable and completely unob-
scured, viewable and partially obscured, or not viewable to view-
able and fully obscured, the X server generates the event with the
state member of the XVisibilityEvent structure set to Visibility-
FullyObscured.
SEE ALSO
XAnyEvent(3), XButtonEvent(3), XCreateWindowEvent(3), XCircula-
teEvent(3), XCirculateRequestEvent(3), XColormapEvent(3), XConfig-
ureEvent(3), XConfigureRequestEvent(3), XCrossingEvent(3), XDestroyWin-
dowEvent(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), XS-
electionRequestEvent(3), XUnmapEvent(3),
Xlib - C Language X Interface
X Version 11 libX11 1.8.12 XVisibilityEvent(3)
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