[Xcb] is it possible to monitor events in other windows?

[Patrick]

Hi Everyone

So this is a bit of a long story and to keep it suitable for the mailing 
list, I am basically trying to monitor mouse clicks in a terminal under 
X as opposed to using gpm through ncurses.

I have chopped down an example from freedsktop.org and I have it pasted 
at the end of this email.

This is the part I am confused about:
xcb_wait_for_event (c)


This is responding to events in the window created but is the windows ID 
passed implicitly ? Is there a way to pass another windows ID ? I am 
basically planning on creating a small xcb program that will take the 
window ID of the terminal that the program is running in, I don't want 
to create another window.

Thanks for reading my post-Patrick




code-->---------------------------->

#include <stdlib.h>
#include <stdio.h>
#include <xcb/xcb.h>

int main (int argc, int * argv[])
{
   xcb_connection_t    *c;
   xcb_screen_t        *screen;
   xcb_window_t         win;
   xcb_generic_event_t *e;
   uint32_t             mask = 0;
   uint32_t             values[2];

   /* Open the connection to the X server */
   c = xcb_connect (NULL, NULL);

   /* Get the first screen */
   screen = xcb_setup_roots_iterator (xcb_get_setup (c)).data;

   /* Ask for our window's Id */
   win = xcb_generate_id (c);
//  win = 65574484 ;

   /* Create the window */
   mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
   values[0] = screen->white_pixel;
   values[1] = XCB_EVENT_MASK_EXPOSURE  | XCB_EVENT_MASK_BUTTON_PRESS   
| XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_KEY_PRESS      | 
XCB_EVENT_MASK_KEY_RELEASE;
   xcb_create_window (c,                             /* 
Connection          */
                      0,                             /* 
depth               */
                      win,                           /* window 
Id           */
                      screen->root,                  /* parent 
window       */
                      0, 0,                          /* x, 
y                */
                      150, 150,                      /* width, 
height       */
                      10,                            /* 
border_width        */
                      XCB_WINDOW_CLASS_INPUT_OUTPUT, /* 
class               */
                      screen->root_visual,           /* 
visual              */
                      mask, values);                 /* masks */

   /* Map the window on the screen */
   xcb_map_window (c, win);
   xcb_flush (c);
//CONFUSED HERE
   while (    (e = xcb_wait_for_event (c) )      ) {
     switch (e->response_type & ~0x80) {

                     case XCB_BUTTON_RELEASE: {
                     xcb_button_release_event_t *ev = 
(xcb_button_release_event_t *)e;
                     printf ("Button %d released in window %ld, at 
coordinates (%d,%d)\n",  ev->detail, ev->event, ev->event_x, ev->event_y);
                     break;
                     }

                case XCB_KEY_PRESS: {
                xcb_key_press_event_t *ev = (xcb_key_press_event_t *)e;
                printf ("Key pressed in window %ld\n", ev->event);
                break;
                }
     case XCB_KEY_RELEASE: {
     xcb_key_release_event_t *ev = (xcb_key_release_event_t *)e;
     printf ("Key released in window %ld\n",  ev->event);
     break;
     }
     default:
     ;
     break;
     }
/* Free the Generic Event */
free (e);
}

   return 0;
}