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xcb_query_pointer

Section: XCB Requests (3)
Updated: libxcb 1.11
Index Return to Main Contents
 

NAME

xcb_query_pointer - get pointer coordinates  

SYNOPSIS

#include <xcb/xproto.h>  

Request function

xcb_query_pointer_cookie_t xcb_query_pointer(xcb_connection_t *conn, xcb_window_t window);

 

Reply datastructure


typedef struct xcb_query_pointer_reply_t {
    uint8_t      response_type;
    uint8_t      same_screen;
    uint16_t     sequence;
    uint32_t     length;
    xcb_window_t root;
    xcb_window_t child;
    int16_t      root_x;
    int16_t      root_y;
    int16_t      win_x;
    int16_t      win_y;
    uint16_t     mask;
    uint8_t      pad0[2];
} xcb_query_pointer_reply_t;
 

Reply function

xcb_query_pointer_reply_t *xcb_query_pointer_reply(xcb_connection_t *conn, xcb_query_pointer_cookie_t cookie, xcb_generic_error_t **e);
 

REQUEST ARGUMENTS

conn
The XCB connection to X11.
window
A window to check if the pointer is on the same screen as window (see the same_screen field in the reply).
 

REPLY FIELDS

response_type
The type of this reply, in this case XCB_QUERY_POINTER. This field is also present in the xcb_generic_reply_t and can be used to tell replies apart from each other.
sequence
The sequence number of the last request processed by the X11 server.
length
The length of the reply, in words (a word is 4 bytes).
same_screen
If same_screen is False, then the pointer is not on the same screen as the argument window, child is None, and win_x and win_y are zero. If same_screen is True, then win_x and win_y are the pointer coordinates relative to the argument window's origin, and child is the child containing the pointer, if any.
root
The root window the pointer is logically on.
child
The child window containing the pointer, if any, if same_screen is true. If same_screen is false, XCB_NONE is returned.
root_x
The pointer X position, relative to root.
root_y
The pointer Y position, relative to root.
win_x
The pointer X coordinate, relative to child, if same_screen is true. Zero otherwise.
win_y
The pointer Y coordinate, relative to child, if same_screen is true. Zero otherwise.
mask
The current logical state of the modifier keys and the buttons. Note that the logical state of a device (as seen by means of the protocol) may lag the physical state if device event processing is frozen.
 

DESCRIPTION

Gets the root window the pointer is logically on and the pointer coordinates relative to the root window's origin.  

RETURN VALUE

Returns an xcb_query_pointer_cookie_t. Errors have to be handled when calling the reply function xcb_query_pointer_reply.

If you want to handle errors in the event loop instead, use xcb_query_pointer_unchecked. See xcb-requests(3) for details.  

ERRORS

xcb_window_error_t
The specified window does not exist.
 

SEE ALSO

xcb-requests(3)  

AUTHOR

Generated from xproto.xml. Contact xcb@lists.freedesktop.org for corrections and improvements.


 

Index

NAME
SYNOPSIS
Request function
Reply datastructure
Reply function
REQUEST ARGUMENTS
REPLY FIELDS
DESCRIPTION
RETURN VALUE
ERRORS
SEE ALSO
AUTHOR


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