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use std::mem;
use std::ptr;
use std::slice;
use libc::{c_uint, c_void};
use ffi as glib_ffi;
use gobject_ffi;
use translate::{ToGlibPtr, ToGlibPtrMut, FromGlibPtrFull, Uninitialized, Stash, from_glib_none};
use types::Type;
use Value;
use ToValue;
glib_wrapper! {
pub struct Closure(Shared<gobject_ffi::GClosure>);
match fn {
ref => |ptr| {
gobject_ffi::g_closure_ref(ptr);
gobject_ffi::g_closure_sink(ptr);
},
unref => |ptr| gobject_ffi::g_closure_unref(ptr),
get_type => || gobject_ffi::g_closure_get_type(),
}
}
impl Closure {
pub fn new<F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static>(callback: F) -> Self {
unsafe extern "C" fn marshal<F>(_closure: *mut gobject_ffi::GClosure, return_value: *mut gobject_ffi::GValue,
n_param_values: c_uint, param_values: *mut gobject_ffi::GValue, _invocation_hint: *mut c_void,
marshal_data: *mut c_void)
where F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static
{
let values = slice::from_raw_parts(param_values as *const _, n_param_values as usize);
let callback: Box<F> = Box::from_raw(marshal_data as *mut _);
let result = callback(values);
if !return_value.is_null() {
match result {
Some(result) => *return_value = result.into_raw(),
None => {
let result = Value::uninitialized();
*return_value = result.into_raw();
},
}
}
mem::forget(callback);
}
unsafe extern "C" fn finalize<F>(notify_data: *mut c_void, _closure: *mut gobject_ffi::GClosure)
where F: Fn(&[Value]) -> Option<Value> + Send + Sync + 'static
{
let _callback: Box<F> = Box::from_raw(notify_data as *mut _);
}
unsafe {
let size = 4 + 4 + 3 * mem::size_of::<*mut c_void>() as u32;
let closure = gobject_ffi::g_closure_new_simple(size, ptr::null_mut());
assert_ne!(closure, ptr::null_mut());
let callback = Box::new(callback);
let ptr: *mut F = Box::into_raw(callback);
let ptr: *mut c_void = ptr as *mut _;
gobject_ffi::g_closure_set_meta_marshal(closure, ptr, Some(marshal::<F>));
gobject_ffi::g_closure_add_finalize_notifier(closure, ptr, Some(finalize::<F>));
from_glib_none(closure)
}
}
pub fn invoke(&self, values: &[&ToValue]) -> Option<Value> {
let mut result = unsafe { Value::uninitialized() };
let mut values: Vec<_> = values.iter()
.map(|v| v.to_value())
.collect();
let gvalues = values.as_mut_ptr() as *mut _;
unsafe {
gobject_ffi::g_closure_invoke(self.to_glib_none().0 as *mut _, result.to_glib_none_mut().0,
values.len() as u32, gvalues, ptr::null_mut());
}
if result.type_() == Type::Invalid {
None
} else {
Some(result)
}
}
}
#[cfg(test)]
mod tests {
use std::sync::Arc;
use std::sync::atomic::{AtomicUsize, Ordering};
use super::Closure;
use ToValue;
use Value;
fn closure_fn(values: &[Value]) -> Option<Value> {
assert_eq!(values.len(), 2);
let string: Option<String> = values[0].get();
assert_eq!(string, Some("test".to_string()));
let int: Option<i32> = values[1].get();
assert_eq!(int, Some(42));
Some(24.to_value())
}
#[test]
fn test_closure() {
let call_count = Arc::new(AtomicUsize::new(0));
let count = call_count.clone();
let closure = Closure::new(move |values| {
count.fetch_add(1, Ordering::Relaxed);
assert_eq!(values.len(), 2);
let string: Option<String> = values[0].get();
assert_eq!(string, Some("test".to_string()));
let int: Option<i32> = values[1].get();
assert_eq!(int, Some(42));
None
});
let result = closure.invoke(&[&"test".to_string(), &42]);
assert!(result.is_none());
assert_eq!(call_count.load(Ordering::Relaxed), 1);
let result = closure.invoke(&[&"test".to_string(), &42]);
assert!(result.is_none());
assert_eq!(call_count.load(Ordering::Relaxed), 2);
let closure = Closure::new(closure_fn);
let result = closure.invoke(&[&"test".to_string(), &42]);
let int: Option<i32> = result.and_then(|result| result.get());
assert_eq!(int, Some(24));
}
}