XButtonEvent(3X11) XLIB FUNCTIONS XButtonEvent(3X11)NAME
XButtonEvent, XKeyEvent, XMotionEvent - KeyPress, KeyRe-
lease, ButtonPress, ButtonRelease, and MotionNotify event
structures
STRUCTURES
The structures for KeyPress, KeyRelease, ButtonPress,
ButtonRelease, and MotionNotify events contain:
typedef struct {
int type; /* ButtonPress or ButtonRelease */
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 it is 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 */
unsigned int state; /* key or button mask */
unsigned int button; /* detail */
Bool same_screen; /* same screen flag */
} XButtonEvent;
typedef XButtonEvent XButtonPressedEvent;
typedef XButtonEvent XButtonReleasedEvent;
typedef struct {
int type; /* KeyPress or KeyRelease */
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 it is 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 */
unsigned int state; /* key or button mask */
unsigned int keycode; /* detail */
Bool same_screen; /* same screen flag */
} XKeyEvent;
typedef XKeyEvent XKeyPressedEvent;
typedef XKeyEvent XKeyReleasedEvent;
typedef struct {
int type; /* MotionNotify */
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 */
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XButtonEvent(3X11) XLIB FUNCTIONS XButtonEvent(3X11)
int x, y; /* pointer x, y coordinates in event window */
int x_root, y_root; /* coordinates relative to root */
unsigned int state; /* key or button mask */
char is_hint; /* detail */
Bool same_screen; /* same screen flag */
} XMotionEvent;
typedef XMotionEvent XPointerMovedEvent;
When you receive these events, their 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.
These structures have the following common members: win-
dow, root, subwindow, time, x, y, x_root, y_root, state,
and same_screen. The window member is set to the window
on which the event was generated and is referred to as the
event window. As long as the conditions previously dis-
cussed are met, this is the window used by the X server to
report the event. The root member is set to the source
window's root window. The x_root and y_root members are
set to the pointer's coordinates relative to the root win-
dow'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.
If the source window is an inferior of the event window,
the subwindow member of the structure is set to the child
of the event window that is the source window or the child
of the event window that is an ancestor of the source win-
dow. Otherwise, the X server sets the subwindow member to
None. The time member is set to the time when the event
was generated and is expressed in milliseconds.
If the event window is on the same screen as the root win-
dow, the x and y members are set to the coordinates rela-
tive to the event window's origin. Otherwise, these mem-
bers are set to zero.
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XButtonEvent(3X11) XLIB FUNCTIONS XButtonEvent(3X11)
The state member is set to indicate the logical state of
the pointer buttons and modifier keys just prior to the
event, which is 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, and Mod5Mask.
Each of these structures also has a member that indicates
the detail. For the XKeyPressedEvent and XKeyReleasedE-
vent structures, this member is called a keycode. It is
set to a number that represents a physical key on the key-
board. The keycode is an arbitrary representation for any
key on the keyboard (see sections 12.7 and 16.1).
For the XButtonPressedEvent and XButtonReleasedEvent
structures, this member is called button. It represents
the pointer button that changed state and can be the
Button1, Button2, Button3, Button4, or Button5 value. For
the XPointerMovedEvent structure, this member is called
is_hint. It can be set to NotifyNormal or NotifyHint.
SEE ALSOXAnyEvent(3X11), XCreateWindowEvent(3X11), XCircula-
teEvent(3X11), XCirculateRequestEvent(3X11), XCol-
ormapEvent(3X11), XConfigureEvent(3X11), XConfigur-
eRequestEvent(3X11), XCrossingEvent(3X11), XDestroyWindow-
Event(3X11), XErrorEvent(3X11), XExposeEvent(3X11), XFo-
cusChangeEvent(3X11), XGraphicsExposeEvent(3X11), XGravi-
tyEvent(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
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