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simple xlib key example
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| #include <stdio.h> | |
| #include <locale.h> | |
| #include <X11/Xlib.h> | |
| #include <X11/keysym.h> | |
| int main(void){ | |
| setlocale(LC_ALL, ""); | |
| Display* dpy = XOpenDisplay(NULL); | |
| Window win = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, 100, 100, 0, 0, 0); | |
| XMapRaised(dpy, win); | |
| XSync(dpy, False); | |
| // X input method setup, only strictly necessary for intl key text | |
| // loads the XMODIFIERS environment variable to see what IME to use | |
| XSetLocaleModifiers(""); | |
| XIM xim = XOpenIM(dpy, 0, 0, 0); | |
| if(!xim){ | |
| // fallback to internal input method | |
| XSetLocaleModifiers("@im=none"); | |
| xim = XOpenIM(dpy, 0, 0, 0); | |
| } | |
| // X input context, you can have multiple for text boxes etc, but having a | |
| // single one is the easiest. | |
| XIC xic = XCreateIC(xim, | |
| XNInputStyle, XIMPreeditNothing | XIMStatusNothing, | |
| XNClientWindow, win, | |
| XNFocusWindow, win, | |
| NULL); | |
| XSetICFocus(xic); | |
| // we want key presses | |
| XSelectInput(dpy, win, KeyPressMask | KeyReleaseMask); | |
| // main loop | |
| XEvent prev_ev = {}, ev = {}; | |
| // you probably want XPending(dpy) here instead of 1, and an outer main loop | |
| // where you do things other than just getting X events | |
| while(1){ | |
| XNextEvent(dpy, &ev); | |
| // this is needed for IMEs to hook keypresses is some cases, | |
| // if you need keys even when they're filtered things get a bit more complex | |
| if(XFilterEvent(&ev, None) == True) continue; | |
| switch(ev.type){ | |
| case KeyPress: { | |
| // note: if you just want the XK_ keysym, then you can just use | |
| // XLookupKeysym(&ev.xkey, 0); | |
| // and ignore all the XIM / XIC / status etc stuff | |
| Status status; | |
| KeySym keysym = NoSymbol; | |
| char text[32] = {}; | |
| // if you want to tell if this was a repeated key, this trick seems reliable. | |
| int is_repeat = prev_ev.type == KeyRelease && | |
| prev_ev.xkey.time == ev.xkey.time && | |
| prev_ev.xkey.keycode == ev.xkey.keycode; | |
| // you might want to remove the control modifier, since it makes stuff return control codes | |
| ev.xkey.state &= ~ControlMask; | |
| // get text from the key. | |
| // it could be multiple characters in the case an IME is used. | |
| // if you only care about latin-1 input, you can use XLookupString instead | |
| // and skip all the XIM / XIC setup stuff | |
| Xutf8LookupString(xic, &ev.xkey, text, sizeof(text) - 1, &keysym, &status); | |
| if(status == XBufferOverflow){ | |
| // an IME was probably used, and wants to commit more than 32 chars. | |
| // ignore this fairly unlikely case for now | |
| } | |
| if(status == XLookupChars){ | |
| // some characters were returned without an associated key, | |
| // again probably the result of an IME | |
| printf("Got chars: (%s)\n", text); | |
| } | |
| if(status == XLookupBoth){ | |
| // we got one or more characters with an associated keysym | |
| // (all the keysyms are listed in /usr/include/X11/keysymdef.h) | |
| char* sym_name = XKeysymToString(keysym); | |
| printf("Got both: (%s), (%s)\n", text, sym_name); | |
| } | |
| if(status == XLookupKeySym){ | |
| // a key without text on it | |
| char* sym_name = XKeysymToString(keysym); | |
| printf("Got keysym: (%s)\n", sym_name); | |
| } | |
| // example of responding to a key | |
| if(keysym == XK_Escape){ | |
| puts("Exiting because escape was pressed."); | |
| return 0; | |
| } | |
| } break; | |
| } | |
| prev_ev = ev; | |
| } | |
| return 0; | |
| } |
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