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use std::{
os::raw::{c_short, c_void},
ptr,
sync::Arc,
};
use super::{ffi, util, XConnection, XError};
#[derive(Debug)]
pub enum ImeContextCreationError {
XError(XError),
Null,
}
unsafe fn create_pre_edit_attr<'a>(
xconn: &'a Arc<XConnection>,
ic_spot: &'a ffi::XPoint,
) -> util::XSmartPointer<'a, c_void> {
util::XSmartPointer::new(
xconn,
(xconn.xlib.XVaCreateNestedList)(
0,
ffi::XNSpotLocation_0.as_ptr() as *const _,
ic_spot,
ptr::null_mut::<()>(),
),
)
.expect("XVaCreateNestedList returned NULL")
}
#[derive(Debug)]
pub struct ImeContext {
pub ic: ffi::XIC,
pub ic_spot: ffi::XPoint,
}
impl ImeContext {
pub unsafe fn new(
xconn: &Arc<XConnection>,
im: ffi::XIM,
window: ffi::Window,
ic_spot: Option<ffi::XPoint>,
) -> Result<Self, ImeContextCreationError> {
let ic = if let Some(ic_spot) = ic_spot {
ImeContext::create_ic_with_spot(xconn, im, window, ic_spot)
} else {
ImeContext::create_ic(xconn, im, window)
};
let ic = ic.ok_or(ImeContextCreationError::Null)?;
xconn
.check_errors()
.map_err(ImeContextCreationError::XError)?;
Ok(ImeContext {
ic,
ic_spot: ic_spot.unwrap_or_else(|| ffi::XPoint { x: 0, y: 0 }),
})
}
unsafe fn create_ic(
xconn: &Arc<XConnection>,
im: ffi::XIM,
window: ffi::Window,
) -> Option<ffi::XIC> {
let ic = (xconn.xlib.XCreateIC)(
im,
ffi::XNInputStyle_0.as_ptr() as *const _,
ffi::XIMPreeditNothing | ffi::XIMStatusNothing,
ffi::XNClientWindow_0.as_ptr() as *const _,
window,
ptr::null_mut::<()>(),
);
if ic.is_null() {
None
} else {
Some(ic)
}
}
unsafe fn create_ic_with_spot(
xconn: &Arc<XConnection>,
im: ffi::XIM,
window: ffi::Window,
ic_spot: ffi::XPoint,
) -> Option<ffi::XIC> {
let pre_edit_attr = create_pre_edit_attr(xconn, &ic_spot);
let ic = (xconn.xlib.XCreateIC)(
im,
ffi::XNInputStyle_0.as_ptr() as *const _,
ffi::XIMPreeditNothing | ffi::XIMStatusNothing,
ffi::XNClientWindow_0.as_ptr() as *const _,
window,
ffi::XNPreeditAttributes_0.as_ptr() as *const _,
pre_edit_attr.ptr,
ptr::null_mut::<()>(),
);
if ic.is_null() {
None
} else {
Some(ic)
}
}
pub fn focus(&self, xconn: &Arc<XConnection>) -> Result<(), XError> {
unsafe {
(xconn.xlib.XSetICFocus)(self.ic);
}
xconn.check_errors()
}
pub fn unfocus(&self, xconn: &Arc<XConnection>) -> Result<(), XError> {
unsafe {
(xconn.xlib.XUnsetICFocus)(self.ic);
}
xconn.check_errors()
}
pub fn set_spot(&mut self, xconn: &Arc<XConnection>, x: c_short, y: c_short) {
if self.ic_spot.x == x && self.ic_spot.y == y {
return;
}
self.ic_spot = ffi::XPoint { x, y };
unsafe {
let pre_edit_attr = create_pre_edit_attr(xconn, &self.ic_spot);
(xconn.xlib.XSetICValues)(
self.ic,
ffi::XNPreeditAttributes_0.as_ptr() as *const _,
pre_edit_attr.ptr,
ptr::null_mut::<()>(),
);
}
}
}