move the input processing into the backend

1 files changed, 43 insertions, 0 deletions

diff --git a/xlib.c b/xlib.c
index 6578ca7..4d8d039 100644
--- a/xlib.c
+++ b/xlib.c
@@ -59,6 +59,49 @@ cairo_surface_t *runes_surface_create(RunesWindow *w)
     return cairo_xlib_surface_create(w->dpy, w->w, vis, 240, 80);
 }
 
+void runes_window_prepare_input(RunesWindow *w)
+{
+    unsigned long mask;
+
+    XGetICValues(w->ic, XNFilterEvents, &mask, NULL);
+    XSelectInput(w->dpy, w->w, mask|KeyPressMask);
+    XSetICFocus(w->ic);
+}
+
+void runes_window_read_key(RunesWindow *w, char **outbuf, size_t *outlen)
+{
+    static char *buf = NULL;
+    static size_t len = 8;
+    XEvent e;
+    Status s;
+    KeySym sym;
+    size_t chars;
+
+    if (!buf) {
+        buf = malloc(len);
+    }
+
+    XNextEvent(w->dpy, &e);
+    if (XFilterEvent(&e, None) || e.type != KeyPress) {
+        *outlen = 0;
+        *outbuf = buf;
+        return;
+    }
+
+    for (;;) {
+        chars = Xutf8LookupString(w->ic, &e.xkey, buf, len - 1, &sym, &s);
+        if (s == XBufferOverflow) {
+            len = chars + 1;
+            buf = realloc(buf, len);
+            continue;
+        }
+        break;
+    }
+
+    *outlen = chars;
+    *outbuf = buf;
+}
+
 void runes_window_destroy(RunesWindow *w)
 {
     XDestroyWindow(w->dpy, w->w);