Files
wisp-open/internal/xhotkey/hotkey_linux.c
T

112 lines
2.6 KiB
C

// Copyright 2021 The golang.design Initiative Authors.
// All rights reserved. Use of this source code is governed
// by a MIT license that can be found in the LICENSE file.
//
// Written by Changkun Ou <changkun.de>
//go:build linux
#include <stdint.h>
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/XKBlib.h>
#include <unistd.h>
extern void hotkeyDown(uintptr_t hkhandle);
extern void hotkeyUp(uintptr_t hkhandle);
extern int checkCancel(uintptr_t hkhandle);
// Effective modifier masks for XGrabKey when NumLock / CapsLock are on.
// See: https://stackoverflow.com/questions/4037230/how-to-handle-global-hotkeys-with-x11-xlib
static unsigned int mod_masks[4];
static void init_mod_masks(unsigned int mod) {
mod_masks[0] = mod;
mod_masks[1] = mod | Mod2Mask;
mod_masks[2] = mod | LockMask;
mod_masks[3] = mod | Mod2Mask | LockMask;
}
static void grab_all(Display* d, int keycode, unsigned int mod, Window w) {
init_mod_masks(mod);
for (int i = 0; i < 4; i++) {
XGrabKey(d, keycode, mod_masks[i], w, False, GrabModeAsync, GrabModeAsync);
}
}
static void ungrab_all(Display* d, int keycode, unsigned int mod, Window w) {
init_mod_masks(mod);
for (int i = 0; i < 4; i++) {
XUngrabKey(d, keycode, mod_masks[i], w);
}
}
int displayTest() {
Display* d = NULL;
for (int i = 0; i < 42; i++) {
d = XOpenDisplay(0);
if (d == NULL) continue;
break;
}
if (d == NULL) {
return -1;
}
XCloseDisplay(d);
return 0;
}
// waitHotkey blocks until the hotkey is triggered.
int waitHotkey(uintptr_t hkhandle, unsigned int mod, int key) {
Display* d = NULL;
for (int i = 0; i < 42; i++) {
d = XOpenDisplay(0);
if (d == NULL) continue;
break;
}
if (d == NULL) {
return -1;
}
// Optional: Ask X server to only send one release at the physical end of auto-repeat.
Bool supported;
XkbSetDetectableAutoRepeat(d, True, &supported);
int keycode = XKeysymToKeycode(d, key);
if (keycode == 0) {
XCloseDisplay(d);
return -1;
}
Window root = DefaultRootWindow(d);
grab_all(d, keycode, mod, root);
XSelectInput(d, root, KeyPressMask | KeyReleaseMask);
XEvent ev;
while(1) {
if (checkCancel(hkhandle) == 1) {
break;
}
if (XPending(d) > 0) {
XNextEvent(d, &ev);
switch(ev.type) {
case KeyPress:
if (ev.xkey.keycode == (unsigned)keycode) {
hotkeyDown(hkhandle);
}
continue;
case KeyRelease:
if (ev.xkey.keycode == (unsigned)keycode) {
hotkeyUp(hkhandle);
}
continue;
}
} else {
usleep(10000); // Poll every 10ms for snappy responsiveness without high CPU
}
}
ungrab_all(d, keycode, mod, root);
XCloseDisplay(d);
return 0;
}