XCrossingEvent - EnterNotify and LeaveNotify event structure
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 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.
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.
XAnyEvent(3),
XButtonEvent(3),
XCreateWindowEvent(3),
XCirculateEvent(3),
XCirculateRequestEvent(3),
XColormapEvent(3),
XConfigureEvent(3),
XConfigureRequestEvent(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),
XVisibilityEvent(3)
Xlib - C Language X Interface