XCrossingEvent(3X11) XLIB FUNCTIONS XCrossingEvent(3X11)NAMEXCrossingEvent - EnterNotify and LeaveNotify event struc-
ture
STRUCTURES
The structure for EnterNotify and LeaveNotify events con-
tains:
typedef struct {
int type; /* EnterNotify or LeaveNotify */
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; /* ``event'' window reported relative to */
Window root; /* root window that the event occurred on */
Window subwindow; /* child window */
Time time; /* milliseconds */
int x, y; /* pointer x, y coordinates in event window */
int x_root, y_root; /* coordinates relative to root */
int mode; /* NotifyNormal, NotifyGrab, NotifyUngrab */
int detail;
/*
* NotifyAncestor, NotifyVirtual, NotifyInferior,
* NotifyNonlinear,NotifyNonlinearVirtual
*/
Bool same_screen; /* same screen flag */
Bool focus; /* boolean focus */
unsigned int state; /* key or button mask */
} XCrossingEvent;
typedef XCrossingEvent XEnterWindowEvent;
typedef XCrossingEvent XLeaveWindowEvent;
When you receive these events, 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 applica-
tion, 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 on which the Enter-
Notify or LeaveNotify event was generated and is referred
to as the event window. This is the window used by the X
server to report the event, and is relative to the root
window on which the event occurred. The root member is
set to the root window of the screen on which the event
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XCrossingEvent(3X11) XLIB FUNCTIONS XCrossingEvent(3X11)
occurred.
For a LeaveNotify event, if a child of the event window
contains the initial position of the pointer, the subwin-
dow component is set to that child. Otherwise, the X
server sets the subwindow member to None. For an Enter-
Notify event, if a child of the event window contains the
final pointer position, the subwindow component is set to
that child or None.
The time member is set to the time when the event was gen-
erated and is expressed in milliseconds. The x and y mem-
bers are set to the coordinates of the pointer position in
the event window. This position is always the pointer's
final position, not its initial position. If the event
window is on the same screen as the root window, x and y
are the pointer coordinates relative to the event window's
origin. Otherwise, x and y are set to zero. The x_root
and y_root members are set to the pointer's coordinates
relative to the root window's origin at the time of the
event.
The same_screen member is set to indicate whether the
event window is on the same screen as the root window and
can be either True or False. If True, the event and root
windows are on the same screen. If False, the event and
root windows are not on the same screen.
The focus member is set to indicate whether the event win-
dow is the focus window or an inferior of the focus win-
dow. The X server can set this member to either True or
False. If True, the event window is the focus window or
an inferior of the focus window. If False, the event win-
dow is not the focus window or an inferior of the focus
window.
The state member is set to indicate the state of the
pointer buttons and modifier keys just prior to the event.
The X server can set this member to the bitwise inclusive
OR of one or more of the button or modifier key masks:
Button1Mask, Button2Mask, Button3Mask, Button4Mask,
Button5Mask, ShiftMask, LockMask, ControlMask, Mod1Mask,
Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask.
The mode member is set to indicate whether the events are
normal events, pseudo-motion events when a grab activates,
or pseudo-motion events when a grab deactivates. The X
server can set this member to NotifyNormal, NotifyGrab, or
NotifyUngrab.
The detail member is set to indicate the notify detail and
can be NotifyAncestor, NotifyVirtual, NotifyInferior,
NotifyNonlinear, or NotifyNonlinearVirtual.
X Version 11 Release 6.4 2
XCrossingEvent(3X11) XLIB FUNCTIONS XCrossingEvent(3X11)SEE ALSOXAnyEvent(3X11), XButtonEvent(3X11), XCreateWindow-
Event(3X11), XCirculateEvent(3X11), XCircu-
lateRequestEvent(3X11), XColormapEvent(3X11), XConfig-
ureEvent(3X11), XConfigureRequestEvent(3X11), XDestroyWin-
dowEvent(3X11), XErrorEvent(3X11), XExposeEvent(3X11),
XFocusChangeEvent(3X11), XGraphicsExposeEvent(3X11),
XGravityEvent(3X11), XKeymapEvent(3X11), XMapEvent(3X11),
XMapRequestEvent(3X11), XPropertyEvent(3X11), XRepar-
entEvent(3X11), XResizeRequestEvent(3X11), XSelection-
ClearEvent(3X11), XSelectionEvent(3X11), XSelectionRe-
questEvent(3X11), XUnmapEvent(3X11), XVisibili-
tyEvent(3X11)
Xlib - C Language X Interface
X Version 11 Release 6.4 3
