NAME

XExposeEvent - Expose event structure

STRUCTURES

The structure for _E_x_p_o_s_e events contains:


typedef struct {
     int type;                /* Expose */
     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;
     int x, y;
     int width, height;
     int count;               /* if nonzero, at least this many more */
} XExposeEvent;


When you receive this event, 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 _G_r_a_p_h_i_c_s_E_x_p_o_s_e event to a client application, it sends an _X_G_r_a_p_h_i_c_s_E_x_p_o_s_e_E_v_e_n_t structure with the type member set to _G_r_a_p_h_i_c_s_E_x_p_o_s_e. The display member is set to a pointer to the display the event was read on. The send_event member is set to _T_r_u_e if the event came from a _S_e_n_d_E_v_e_n_t 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 exposed (damaged) window. The x and y members are set to the coordinates relative to the window's origin and indicate the upper-left corner of the rectangle. The width and height members are set to the size (extent) of the rectangle. The count member is set to the number of _E_x_p_o_s_e events that are to follow. If count is zero, no more _E_x_p_o_s_e events follow for this window. However, if count is nonzero, at least that number of _E_x_p_o_s_e events (and possibly more) follow for this window. Simple applications that do not want to optimize redisplay by distinguishing between subareas of its window can just ignore all _E_x_p_o_s_e events with nonzero counts and perform full redisplays on events with zero counts.

SEE ALSO

XAnyEvent(3X11), XButtonEvent(3X11), XCreateWindowEvent(3X11), XCirculateEvent(3X11), XCirculateRequestEvent(3X11), XColormapEvent(3X11), XConfigureEvent(3X11), XConfigureRequestEvent(3X11), XCrossingEvent(3X11), XDestroyWindowEvent(3X11), XErrorEvent(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)
_X_l_i_b _- _C _L_a_n_g_u_a_g_e _X _I_n_t_e_r_f_a_c_e