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use crate::SpinButton;
use glib::object::Cast;
use glib::signal::{connect_raw, SignalHandlerId};
use glib::translate::*;
use glib::ObjectType;
use libc::{c_double, c_int};
use std::boxed::Box as Box_;
use std::mem::transmute;
impl SpinButton {
pub fn connect_input<F>(&self, f: F) -> SignalHandlerId
where
F: Fn(&Self) -> Option<Result<f64, ()>> + 'static,
{
unsafe {
let f: Box_<F> = Box_::new(f);
connect_raw(
self.as_ptr() as *mut _,
b"input\0".as_ptr() as *mut _,
Some(transmute(input_trampoline::<F> as usize)),
Box_::into_raw(f),
)
}
}
}
unsafe extern "C" fn input_trampoline<F: Fn(&SpinButton) -> Option<Result<f64, ()>> + 'static>(
this: *mut ffi::GtkSpinButton,
new_value: *mut c_double,
f: &F,
) -> c_int {
match f(SpinButton::from_glib_borrow(this).unsafe_cast_ref()) {
Some(Ok(v)) => {
*new_value = v;
glib::ffi::GTRUE
}
Some(Err(_)) => ffi::GTK_INPUT_ERROR,
None => glib::ffi::GFALSE,
}
}