FreeBASIC  0.91.0
io_xfocus.c
Go to the documentation of this file.
1 /* XTerm focus query helpers */
2 
3 #include "../fb.h"
4 
5 #ifndef DISABLE_X11
6 #include "../fb_private_hdynload.h"
7 #include <X11/Xlib.h>
8 
9 typedef Display *(*XOPENDISPLAY)(char *);
10 typedef int (*XCLOSEDISPLAY)(Display *);
11 typedef int (*XGETINPUTFOCUS)(Display *, Window *, int *);
12 
13 typedef struct {
14  XOPENDISPLAY OpenDisplay;
15  XCLOSEDISPLAY CloseDisplay;
16  XGETINPUTFOCUS GetInputFocus;
17 } X_FUNCS;
18 
19 static int ref_count = 0;
20 static FB_DYLIB xlib;
21 static X_FUNCS X = { NULL };
22 static Display *display;
23 static Window xterm_window;
24 #endif
25 
26 int fb_hXTermInitFocus(void)
27 {
28 #ifndef DISABLE_X11
29  const char *funcs[] = { "XOpenDisplay", "XCloseDisplay", "XGetInputFocus", NULL };
30  int dummy;
31 
32  ref_count++;
33  if (ref_count > 1)
34  return 0;
35 
36  xlib = fb_hDynLoad("libX11.so", funcs, (void **)&X);
37  if (!xlib)
38  return -1;
39 
40  display = X.OpenDisplay(NULL);
41  if (!display)
42  return -1;
43 
44  X.GetInputFocus(display, &xterm_window, &dummy);
45 #endif
46  return 0;
47 }
48 
49 void fb_hXTermExitFocus(void)
50 {
51 #ifndef DISABLE_X11
52  ref_count--;
53  if (ref_count > 0)
54  return;
55  X.CloseDisplay(display);
56  fb_hDynUnload(&xlib);
57 #endif
58 }
59 
60 int fb_hXTermHasFocus(void)
61 {
62 #ifndef DISABLE_X11
63  Window focus_window;
64  int dummy;
65 
66  X.GetInputFocus(display, &focus_window, &dummy);
67 
68  return (focus_window == xterm_window);
69 #else
70  return 0;
71 #endif
72 }