diff options
Diffstat (limited to 'src/GlobalHotkeysX11.cpp')
| -rw-r--r-- | src/GlobalHotkeysX11.cpp | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/GlobalHotkeysX11.cpp b/src/GlobalHotkeysX11.cpp new file mode 100644 index 0000000..6b01bfd --- /dev/null +++ b/src/GlobalHotkeysX11.cpp @@ -0,0 +1,137 @@ +#include "../include/GlobalHotkeysX11.hpp" +#define XK_MISCELLANY +#include <X11/keysymdef.h> + +namespace gsr { + static bool x_failed = false; + static int xerror_grab_error(Display*, XErrorEvent*) { + x_failed = true; + return 0; + } + + static unsigned int x11_get_numlock_mask(Display *dpy) { + unsigned int numlockmask = 0; + KeyCode numlock_keycode = XKeysymToKeycode(dpy, XK_Num_Lock); + XModifierKeymap *modmap = XGetModifierMapping(dpy); + if(modmap) { + for(int i = 0; i < 8; ++i) { + for(int j = 0; j < modmap->max_keypermod; ++j) { + if(modmap->modifiermap[i * modmap->max_keypermod + j] == numlock_keycode) + numlockmask = (1 << i); + } + } + XFreeModifiermap(modmap); + } + return numlockmask; + } + + GlobalHotkeysX11::GlobalHotkeysX11() { + dpy = XOpenDisplay(NULL); + if(!dpy) + fprintf(stderr, "GlobalHotkeysX11 error: failed to connect to X11 server, global hotkeys wont be available\n"); + } + + GlobalHotkeysX11::~GlobalHotkeysX11() { + if(dpy) { + XCloseDisplay(dpy); + dpy = nullptr; + } + } + + bool GlobalHotkeysX11::bind_key_press(Hotkey hotkey, const std::string &id, GlobalHotkeyCallback callback) { + if(!dpy) + return false; + + auto it = bound_keys_by_id.find(id); + if(it != bound_keys_by_id.end()) + return false; + + x_failed = false; + XErrorHandler prev_xerror = XSetErrorHandler(xerror_grab_error); + + unsigned int numlock_mask = x11_get_numlock_mask(dpy); + unsigned int modifiers[] = { 0, LockMask, numlock_mask, numlock_mask|LockMask }; + for(int i = 0; i < 4; ++i) { + XGrabKey(dpy, XKeysymToKeycode(dpy, hotkey.key), hotkey.modifiers | modifiers[i], DefaultRootWindow(dpy), False, GrabModeAsync, GrabModeAsync); + } + XSync(dpy, False); + + if(x_failed) { + for(int i = 0; i < 4; ++i) { + XUngrabKey(dpy, XKeysymToKeycode(dpy, hotkey.key), hotkey.modifiers | modifiers[i], DefaultRootWindow(dpy)); + } + XSync(dpy, False); + XSetErrorHandler(prev_xerror); + return false; + } else { + XSetErrorHandler(prev_xerror); + bound_keys_by_id[id] = { hotkey, std::move(callback) }; + return true; + } + } + + void GlobalHotkeysX11::unbind_key_press(const std::string &id) { + if(!dpy) + return; + + auto it = bound_keys_by_id.find(id); + if(it == bound_keys_by_id.end()) + return; + + x_failed = false; + XErrorHandler prev_xerror = XSetErrorHandler(xerror_grab_error); + + unsigned int numlock_mask = x11_get_numlock_mask(dpy); + unsigned int modifiers[] = { 0, LockMask, numlock_mask, numlock_mask|LockMask }; + for(int i = 0; i < 4; ++i) { + XUngrabKey(dpy, XKeysymToKeycode(dpy, it->second.hotkey.key), it->second.hotkey.modifiers | modifiers[i], DefaultRootWindow(dpy)); + } + XSync(dpy, False); + + XSetErrorHandler(prev_xerror); + bound_keys_by_id.erase(id); + } + + void GlobalHotkeysX11::unbind_all_keys() { + if(!dpy) + return; + + x_failed = false; + XErrorHandler prev_xerror = XSetErrorHandler(xerror_grab_error); + + unsigned int numlock_mask = x11_get_numlock_mask(dpy); + unsigned int modifiers[] = { 0, LockMask, numlock_mask, numlock_mask|LockMask }; + for(auto it = bound_keys_by_id.begin(); it != bound_keys_by_id.end();) { + for(int i = 0; i < 4; ++i) { + XUngrabKey(dpy, XKeysymToKeycode(dpy, it->second.hotkey.key), it->second.hotkey.modifiers | modifiers[i], DefaultRootWindow(dpy)); + } + } + bound_keys_by_id.clear(); + XSync(dpy, False); + + XSetErrorHandler(prev_xerror); + } + + void GlobalHotkeysX11::poll_events() { + while(XPending(dpy)) { + XNextEvent(dpy, &xev); + if(xev.type == KeyPress) { + const KeySym key_sym = XLookupKeysym(&xev.xkey, 0); + call_hotkey_callback({ key_sym, xev.xkey.state }); + } + } + } + + static unsigned int key_state_without_locks(unsigned int key_state) { + return key_state & ~(Mod2Mask|LockMask); + } + + void GlobalHotkeysX11::call_hotkey_callback(Hotkey hotkey) const { + for(const auto &[key, val] : bound_keys_by_id) { + if(val.hotkey.key == hotkey.key && key_state_without_locks(val.hotkey.modifiers) == key_state_without_locks(hotkey.modifiers)) { + val.callback(key); + return; + } + } + } +}
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