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use glib_sys;
use gobject_sys;
use std::ops;
use translate::*;
use value::*;
pub trait BoxedType: Clone + Sized + 'static {
const NAME: &'static str;
fn get_type() -> ::Type;
}
pub fn register_boxed_type<T: BoxedType>() -> ::Type {
unsafe extern "C" fn boxed_copy<T: BoxedType>(v: glib_sys::gpointer) -> glib_sys::gpointer {
let v = &*(v as *mut T);
let copy = Box::new(v.clone());
Box::into_raw(copy) as glib_sys::gpointer
}
unsafe extern "C" fn boxed_free<T: BoxedType>(v: glib_sys::gpointer) {
let v = v as *mut T;
let _ = Box::from_raw(v);
}
unsafe {
use std::ffi::CString;
let type_name = CString::new(T::NAME).unwrap();
if gobject_sys::g_type_from_name(type_name.as_ptr()) != gobject_sys::G_TYPE_INVALID {
panic!(
"Type {} has already been registered",
type_name.to_str().unwrap()
);
}
from_glib(gobject_sys::g_boxed_type_register_static(
type_name.as_ptr(),
Some(boxed_copy::<T>),
Some(boxed_free::<T>),
))
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Boxed<T: BoxedType>(pub T);
impl<T: BoxedType> ops::Deref for Boxed<T> {
type Target = T;
fn deref(&self) -> &T {
&self.0
}
}
impl<T: BoxedType> ops::DerefMut for Boxed<T> {
fn deref_mut(&mut self) -> &mut T {
&mut self.0
}
}
impl<T: BoxedType> ::StaticType for Boxed<T> {
fn static_type() -> ::Type {
T::get_type()
}
}
impl<T: BoxedType> SetValue for Boxed<T> {
unsafe fn set_value(value: &mut Value, this: &Self) {
let ptr: *mut Boxed<T> = Box::into_raw(Box::new(this.clone()));
gobject_sys::g_value_take_boxed(value.to_glib_none_mut().0, ptr as *mut _);
}
}
impl<T: BoxedType> SetValueOptional for Boxed<T> {
unsafe fn set_value_optional(value: &mut Value, this: Option<&Self>) {
let this = this.expect("None not allowed");
let ptr: *mut Boxed<T> = Box::into_raw(Box::new(this.clone()));
gobject_sys::g_value_take_boxed(value.to_glib_none_mut().0, ptr as *mut _);
}
}
impl<'a, T: BoxedType> FromValueOptional<'a> for &'a Boxed<T> {
unsafe fn from_value_optional(value: &'a Value) -> Option<Self> {
let ptr = gobject_sys::g_value_get_boxed(value.to_glib_none().0);
assert!(!ptr.is_null());
Some(&*(ptr as *mut Boxed<T>))
}
}
impl<'a, T: BoxedType> FromValue<'a> for &'a Boxed<T> {
unsafe fn from_value(value: &'a Value) -> Self {
let ptr = gobject_sys::g_value_get_boxed(value.to_glib_none().0);
assert!(!ptr.is_null());
&*(ptr as *mut Boxed<T>)
}
}
#[cfg(test)]
mod test {
use super::*;
use crate as glib;
#[derive(Clone, Debug, PartialEq, Eq, glib::GBoxed)]
#[gboxed(type_name = "MyBoxed")]
struct MyBoxed(String);
#[test]
fn test_register() {
assert_ne!(::Type::Invalid, MyBoxed::get_type());
}
#[test]
fn test_value_boxed() {
assert_ne!(::Type::Invalid, MyBoxed::get_type());
let b = Boxed(MyBoxed(String::from("abc")));
let v = b.to_value();
let b2 = v.get_some::<&Boxed<MyBoxed>>().unwrap();
assert_eq!(&b, b2);
}
#[test]
fn test_value() {
assert_ne!(::Type::Invalid, MyBoxed::get_type());
let b = MyBoxed(String::from("abc"));
let v = b.to_value();
let b2 = v.get_some::<&MyBoxed>().unwrap();
assert_eq!(&b, b2);
}
}