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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <locale.h>
#include <langinfo.h>
#include <assert.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysym.h>
static Atom atom_wm_protocols;
static Atom atom_wm_delete;
static Atom atom_wm_state;
static Atom atom_wm_fullscreen;
static Display *dpy;
static Window win;
static GC gc;
static XIM im;
static XIC ic;
static void set_fullscreen()
{
XEvent e = { 0 };
e.type = ClientMessage;
e.xclient.window = win;
e.xclient.message_type = atom_wm_state;
e.xclient.format = 32;
e.xclient.data.l[0] = 1;
e.xclient.data.l[1] = atom_wm_fullscreen;
e.xclient.data.l[2] = 0;
XSendEvent(dpy, DefaultRootWindow(dpy), False, SubstructureNotifyMask, &e);
}
static int preedit_start_cb(XIC ic, XPointer client_data, XPointer p)
{
printf("start preedit\n");
return -1;
}
static int preedit_stop_cb(XIC ic, XPointer client_data, XPointer p)
{
printf("stop preedit\n");
return 0;
}
static int preedit_draw_cb(XIC ic, XPointer client_data, XIMPreeditDrawCallbackStruct *s)
{
printf("draw preedit %d'%s'\n", s->text->length, s->text->string.multi_byte);
return 0;
}
int main(int argc, char ** argv)
{
bool quit = false;
setlocale(LC_ALL, "");
XSetLocaleModifiers("@im=xmim");
char *nl = nl_langinfo(CODESET);
printf("codeset %s\n", nl);
dpy = XOpenDisplay(NULL);
assert(dpy);
int scr = DefaultScreen(dpy);
atom_wm_protocols = XInternAtom(dpy, "WM_PROTOCOLS", True);
atom_wm_delete = XInternAtom(dpy, "WM_DELETE_WINDOW", True);
atom_wm_state = XInternAtom(dpy, "_NET_WM_STATE", True);
atom_wm_fullscreen = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", True);
win = XCreateSimpleWindow(dpy, RootWindow(dpy, scr), 0, 0, 400, 400, 0,
WhitePixel(dpy, scr), WhitePixel(dpy, scr));
im = XOpenIM(dpy, NULL, NULL, NULL);
assert(im);
XIMStyles *xim_styles = NULL;
if (XGetIMValues(im, XNQueryInputStyle, &xim_styles, NULL) == 0) {
printf("styles: (%u)\n", xim_styles->count_styles);
for (int i = 0; i < xim_styles->count_styles; i++) {
const XIMStyle style = xim_styles->supported_styles[i];
printf(" style %lu\n", style);
}
}
XIMCallback preedit_start = { NULL, (XIMProc) preedit_start_cb };
XIMCallback preedit_stop = { NULL, (XIMProc) preedit_stop_cb };
XIMCallback preedit_draw = { NULL, (XIMProc) preedit_draw_cb };
XVaNestedList preedit_list =
XVaCreateNestedList(0,
XNPreeditStartCallback, &preedit_start,
XNPreeditDoneCallback, &preedit_stop,
XNPreeditDrawCallback, &preedit_draw,
NULL);
ic = XCreateIC(im,
XNInputStyle, XIMPreeditCallbacks | XIMStatusNothing,
XNClientWindow, win, XNFocusWindow, win,
XNPreeditAttributes, preedit_list,
NULL);
assert(ic);
XGCValues gc_values;
gc = XCreateGC(dpy, win, 0, &gc_values);
unsigned long im_event_mask;
XGetICValues(ic, XNFilterEvents, &im_event_mask, NULL);
printf("im event mask 0x%lx\n", im_event_mask);
im_event_mask |= KeyPressMask | KeyReleaseMask | ButtonPressMask | FocusChangeMask | ClientMessage;
XSelectInput(dpy, win, im_event_mask);
XSetWMProtocols(dpy, win, &atom_wm_delete, 1);
set_fullscreen();
XMapWindow(dpy, win);
while (!quit) {
XEvent e;
XNextEvent(dpy, &e);
if (XFilterEvent(&e, None)) {
continue;
}
switch (e.type) {
case KeyPress: {
printf("key press\n");
KeySym keysym;
Status status;
int buflength;
static int bufsize = 16;
static char *buf;
if (buf == NULL) {
buf = malloc(bufsize + 1);
assert(buf);
}
buflength = Xutf8LookupString(ic, &e.xkey, buf, bufsize, &keysym, &status);
if (status == XBufferOverflow) {
bufsize = buflength;
buf = realloc(buf, bufsize + 1);
assert(buf);
buflength = Xutf8LookupString(ic, &e.xkey, buf, bufsize, &keysym, &status);
}
switch(status) {
case XLookupKeySym:
printf("keysim(0x%lx)\n", keysym);
break;
case XLookupBoth:
printf("keysim(0x%lx)+", keysym);
// Fallthrough
case XLookupChars:
buf[buflength] = '\0';
printf("string(%d'%s')\n", buflength, buf);
break;
case XLookupNone:
printf("none\n");
break;
default:
printf("weirdo\n");
break;
}
} break;
case KeyRelease:
printf("key release\n");
break;
case ButtonPress:
printf("button press\n");
break;
case FocusIn:
printf("focus in\n");
XSetICFocus(ic);
break;
case FocusOut:
printf("focus out\n");
XUnsetICFocus(ic);
break;
case ClientMessage:
printf("client message\n");
if (e.xclient.message_type == atom_wm_protocols) {
if (e.xclient.data.l[0] == atom_wm_delete) {
quit = true;
}
}
break;
default:
printf("unknown event\n");
break;
}
}
XFreeGC(dpy, gc);
XDestroyIC(ic);
XCloseIM(im);
XDestroyWindow(dpy, win);
XFlush(dpy);
XCloseDisplay(dpy);
return EXIT_SUCCESS;
}
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