XCrossingEvent(3X11)X Version 11 (Release 4) XCrossingEvent(3X11)
NAME
XCrossingEvent - EnterNotify and LeaveNotify event structure
STRUCTURES
The structure for EnterNotify and LeaveNotify events
contains:
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 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
Page 1 (printed 8/30/91)
XCrossingEvent(3X11)X Version 11 (Release 4) XCrossingEvent(3X11)
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
EnterNotify 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
occurred.
For a LeaveNotify event, if a child of the event window
contains the initial position of the pointer, the subwindow
component is set to that child. Otherwise, the X server
sets the subwindow member to None. For an EnterNotify
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
generated and is expressed in milliseconds. The x and y
members 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.
Page 2 (printed 8/30/91)
XCrossingEvent(3X11)X Version 11 (Release 4) XCrossingEvent(3X11)
The focus member is set to indicate whether the event window
is the focus window or an inferior of the focus window. 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 window 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.
SEE ALSO
XAnyEvent(3X11), XButtonEvent(3X11),
XCreateWindowEvent(3X11), XCirculateEvent(3X11),
XCirculateRequestEvent(3X11), XColormapEvent(3X11),
XConfigureEvent(3X11), XConfigureRequestEvent(3X11),
XDestroyWindowEvent(3X11), XErrorEvent(3X11),
XExposeEvent(3X11), XFocusChangeEvent(3X11),
XGraphicsExposeEvent(3X11), XGravityEvent(3X11),
XKeymapEvent(3X11), XMapEvent(3X11), XMapRequestEvent(3X11),
XPropertyEvent(3X11), XReparentEvent(3X11),
XResizeRequestEvent(3X11), XSelectionClearEvent(3X11),
XSelectionEvent(3X11), XSelectionRequestEvent(3X11),
XUnmapEvent(3X11), XVisibilityEvent(3X11)
Xlib - C Language X Interface
Page 3 (printed 8/30/91)