XButtonEvent(3) XLIB FUNCTIONS XButtonEvent(3)
NAME
XButtonEvent, XKeyEvent, XMotionEvent - KeyPress, KeyRelease,
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 */
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 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.
These structures have the following common members: window, 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 discussed 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 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.
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 window. 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 window, the x
and y members are set to the coordinates relative to the event
window's origin. Otherwise, these members are set to zero.
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
XKeyReleasedEvent structures, this
member is called a keycode. It is set to a number that represents a
physical key on the keyboard. 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 ALSO
XAnyEvent(3),
XCreateWindowEvent(3),
XCirculateEvent(3),
XCirculateRequestEvent(3),
XColormapEvent(3),
XConfigureEvent(3),
XConfigureRequestEvent(3),
XCrossingEvent(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 InterfaceX Version 11 libX11 1.8.10 XButtonEvent(3)