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use std::{iter::Enumerate, ptr, slice::Iter};
use super::*;
pub struct Keymap {
keys: [u8; 32],
}
pub struct KeymapIter<'a> {
iter: Enumerate<Iter<'a, u8>>,
index: usize,
item: Option<u8>,
}
impl Keymap {
pub fn iter(&self) -> KeymapIter<'_> {
KeymapIter {
iter: self.keys.iter().enumerate(),
index: 0,
item: None,
}
}
}
impl<'a> IntoIterator for &'a Keymap {
type Item = ffi::KeyCode;
type IntoIter = KeymapIter<'a>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl Iterator for KeymapIter<'_> {
type Item = ffi::KeyCode;
fn next(&mut self) -> Option<ffi::KeyCode> {
if self.item.is_none() {
while let Some((index, &item)) = self.iter.next() {
if item != 0 {
self.index = index;
self.item = Some(item);
break;
}
}
}
self.item.take().map(|item| {
debug_assert!(item != 0);
let bit = first_bit(item);
if item != bit {
self.item = Some(item ^ bit);
}
let shift = bit.trailing_zeros() + (self.index * 8) as u32;
shift as ffi::KeyCode
})
}
}
impl XConnection {
pub fn keycode_to_keysym(&self, keycode: ffi::KeyCode) -> ffi::KeySym {
unsafe { (self.xlib.XKeycodeToKeysym)(self.display, keycode, 0) }
}
pub fn lookup_keysym(&self, xkev: &mut ffi::XKeyEvent) -> ffi::KeySym {
let mut keysym = 0;
unsafe {
(self.xlib.XLookupString)(xkev, ptr::null_mut(), 0, &mut keysym, ptr::null_mut());
}
keysym
}
pub fn query_keymap(&self) -> Keymap {
let mut keys = [0; 32];
unsafe {
(self.xlib.XQueryKeymap)(self.display, keys.as_mut_ptr() as *mut c_char);
}
Keymap { keys }
}
}
fn first_bit(b: u8) -> u8 {
1 << b.trailing_zeros()
}