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Linux: Allow using XKB key names to bind shortcuts to keys not supported by GLFW

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Useful to bind keys such as the play/pause or volume buttons. Also can
be used to bind non-ascii keys on international keyboards. Fixes #665
This commit is contained in:
Kovid Goyal
2018-06-22 12:41:50 +05:30
parent 5dd3243674
commit c8fc21d336
7 changed files with 104 additions and 36 deletions
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76
kitty/keys.c
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@@ -26,12 +26,26 @@ key_to_bytes(int glfw_key, bool smkx, bool extended, int mods, int action) {
#define SPECIAL_INDEX(key) ((key & 0x7f) | ( (mods & 0xF) << 7))
#define IS_ALT_MODS(mods) (mods == GLFW_MOD_ALT || mods == (GLFW_MOD_ALT | GLFW_MOD_SHIFT))
typedef struct { int mods, scancode; } NativeKey;
static NativeKey *native_special_keys = NULL;
static size_t native_special_keys_capacity = 0, native_special_keys_count = 0;
void
set_special_key_combo(int glfw_key, int mods) {
uint16_t key = key_map[glfw_key];
if (key != UINT8_MAX) {
key = SPECIAL_INDEX(key);
needs_special_handling[key] = true;
set_special_key_combo(int glfw_key, int mods, bool is_native) {
if (is_native) {
if (native_special_keys_count >= native_special_keys_capacity) {
native_special_keys_capacity = MAX(128, 2 * native_special_keys_capacity);
native_special_keys = realloc(native_special_keys, sizeof(native_special_keys[0]) * native_special_keys_capacity);
if (native_special_keys == NULL) fatal("Out of memory");
}
native_special_keys[native_special_keys_count].mods = mods;
native_special_keys[native_special_keys_count++].scancode = glfw_key;
} else {
uint16_t key = key_map[glfw_key];
if (key != UINT8_MAX) {
key = SPECIAL_INDEX(key);
needs_special_handling[key] = true;
}
}
}
@@ -81,6 +95,24 @@ is_ascii_control_char(char c) {
return c == 0 || (1 <= c && c <= 31) || c == 127;
}
static inline bool
check_if_special(int key, int mods, int scancode) {
uint16_t qkey = (0 <= key && key < (ssize_t)arraysz(key_map)) ? key_map[key] : UINT8_MAX;
bool special = false;
if (qkey != UINT8_MAX) {
qkey = SPECIAL_INDEX(qkey);
special = needs_special_handling[qkey];
}
#ifdef __APPLE__
(void)scancode;
#else
for (size_t i = 0; !special && i < native_special_keys_count; i++) {
if (scancode == native_special_keys[i].scancode && mods == native_special_keys[i].mods) special = true;
}
#endif
return special;
}
void
on_key_input(int key, int scancode, int action, int mods, const char* text, int state UNUSED) {
Window *w = active_window();
@@ -95,14 +127,7 @@ on_key_input(int key, int scancode, int action, int mods, const char* text, int
Screen *screen = w->render_data.screen;
bool has_text = text && !is_ascii_control_char(text[0]);
if (action == GLFW_PRESS || action == GLFW_REPEAT) {
uint16_t qkey = (0 <= key && key < (ssize_t)arraysz(key_map)) ? key_map[key] : UINT8_MAX;
bool special = false;
if (qkey != UINT8_MAX) {
qkey = SPECIAL_INDEX(qkey);
special = needs_special_handling[qkey];
}
/* printf("key: %s mods: %d special: %d\n", key_name(lkey), mods, special); */
if (special) {
if (check_if_special(key, mods, scancode)) {
PyObject *ret = PyObject_CallMethod(global_state.boss, "dispatch_special_key", "iiii", key, scancode, action, mods);
if (ret == NULL) { PyErr_Print(); }
else {
@@ -149,13 +174,38 @@ PYWRAP1(key_to_bytes) {
return Py_BuildValue("y#", ans + 1, *ans);
}
PYWRAP1(key_for_native_key_name) {
const char *name;
int case_sensitive = 0;
PA("s|p", &name, case_sensitive);
#ifdef __APPLE__
Py_RETURN_NONE;
#else
if (glfwGetXKBScancode) { // if this function is called before GLFW is initialized glfwGetXKBScancode will be NULL
int scancode = glfwGetXKBScancode(name, case_sensitive);
if (scancode) return Py_BuildValue("i", scancode);
}
Py_RETURN_NONE;
#endif
}
static PyMethodDef module_methods[] = {
M(key_to_bytes, METH_VARARGS),
M(key_for_native_key_name, METH_VARARGS),
{0}
};
void
finalize(void) {
free(native_special_keys);
}
bool
init_keys(PyObject *module) {
if (PyModule_AddFunctions(module, module_methods) != 0) return false;
if (Py_AtExit(finalize) != 0) {
PyErr_SetString(PyExc_RuntimeError, "Failed to register the keys at exit handler");
return false;
}
return true;
}