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terminal/idev: add helper to match keyboard shortcuts

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Matching keyboard shortcuts on internationalized keyboards is actually
non-trivial. Matching the actual key is easy, but the modifiers can be
used by both, the matching and the translation step. Therefore, XKB
exports "consumed-modifiers" that we use to figure out whether a modifier
was already used by the translation step.

The new IDEV_KBDMATCH() helper can be used to match on any keyboard
shortcut and it will do the right thing.
This commit is contained in:
David Herrmann 2014-10-03 13:11:08 +02:00
parent f8958c3495
commit 884964a963
1 changed files with 22 additions and 0 deletions
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22
src/libsystemd-terminal/idev.h
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@ -110,6 +110,28 @@ struct idev_data_keyboard {
uint32_t *codepoints;
};
static inline bool idev_kbdmatch(idev_data_keyboard *kdata,
uint32_t mods, uint32_t n_syms,
const uint32_t *syms) {
const uint32_t significant = IDEV_KBDMOD_SHIFT |
IDEV_KBDMOD_CTRL |
IDEV_KBDMOD_ALT |
IDEV_KBDMOD_LINUX;
uint32_t real;
if (n_syms != kdata->n_syms)
return false;
real = kdata->mods & ~kdata->consumed_mods & significant;
if (real != (mods & ~kdata->consumed_mods))
return false;
return !memcmp(syms, kdata->keysyms, n_syms * sizeof(*syms));
}
#define IDEV_KBDMATCH(_kdata, _mods, _sym) \
idev_kbdmatch((_kdata), (_mods), 1, (const uint32_t[]){ (_sym) })
/*
* Data Packets
*/