4coder/4ed_linux_keyboard.cpp

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/*
* Mr. 4th Dimention - Allen Webster
*
* 14.11.2015
*
* Linux-US Keyboard layer for 4coder
*
*/
// TOP
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#include "4ed_keyboard.cpp"
internal void
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keycode_init(Display* dpy, Key_Codes *codes){
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set_dynamic_key_names(codes);
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#if 0
// NOTE(inso): these are for XInput, currently not used.
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keycode_lookup_table[KEY_BACKSPACE] = codes->back;
keycode_lookup_table[KEY_DELETE] = codes->del;
keycode_lookup_table[KEY_UP] = codes->up;
keycode_lookup_table[KEY_DOWN] = codes->down;
keycode_lookup_table[KEY_LEFT] = codes->left;
keycode_lookup_table[KEY_RIGHT] = codes->right;
keycode_lookup_table[KEY_INSERT] = codes->insert;
keycode_lookup_table[KEY_HOME] = codes->home;
keycode_lookup_table[KEY_END] = codes->end;
keycode_lookup_table[KEY_PAGEUP] = codes->page_up;
keycode_lookup_table[KEY_PAGEDOWN] = codes->page_down;
keycode_lookup_table[KEY_ESC] = codes->esc;
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#endif
// NOTE(inso): This looks a bit dumb, but it's the best way I can think of to do it, since:
// KeySyms are the type representing "virtual" keys, like XK_BackSpace, but they are 32-bit ints.
// KeyCodes are guaranteed to fit in 1 byte (and therefore the keycode_lookup_table) but
// have dynamic numbers assigned by the XServer.
// There is XKeysymToKeycode, but it only returns 1 KeyCode for a KeySym. I have my capslock
// rebound to esc, so there are two KeyCodes for the XK_Escape KeyCode but XKeysymToKeycode only
// gets one of them, hence the need for this crazy lookup which works correctly with rebound keys.
memset(keycode_lookup_table, 0, sizeof(keycode_lookup_table));
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struct SymMapping {
KeySym sym;
Code code;
} sym_table[] = {
{ XK_BackSpace, codes->back },
{ XK_Delete, codes->del },
{ XK_Up, codes->up },
{ XK_Down, codes->down },
{ XK_Left, codes->left },
{ XK_Right, codes->right },
{ XK_Insert, codes->insert },
{ XK_Home, codes->home },
{ XK_End, codes->end },
{ XK_Page_Up, codes->page_up },
{ XK_Page_Down, codes->page_down },
{ XK_Escape, codes->esc }
};
const int table_size = sizeof(sym_table) / sizeof(struct SymMapping);
int key_min, key_max, syms_per_code;
XDisplayKeycodes(dpy, &key_min, &key_max);
int key_count = (key_max - key_min) + 1;
KeySym* syms = XGetKeyboardMapping(
dpy,
key_min,
key_count,
&syms_per_code
);
if(!syms) return;
int key = key_min;
for(int i = 0; i < key_count * syms_per_code; ++i){
for(int j = 0; j < table_size; ++j){
if(sym_table[j].sym == syms[i]){
keycode_lookup_table[key + (i/syms_per_code)] = sym_table[j].code;
break;
}
}
}
XFree(syms);
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}
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// BOTTOM