src/switch.rs

// Copyright 2013-2017, The Gtk-rs Project Developers.
// See the COPYRIGHT file at the top-level directory of this distribution.
// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>

use glib::object::{Cast, IsA};
use glib::signal::{connect_raw, SignalHandlerId};
use glib::translate::*;
use glib_sys;
use gtk_sys;
use std::boxed::Box as Box_;
use std::mem::transmute;
use Switch;

pub trait SwitchExtManual: 'static {
    fn connect_changed_active<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;
}

impl<O: IsA<Switch>> SwitchExtManual for O {
    fn connect_changed_active<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn changed_active_trampoline<T, F: Fn(&T) + 'static>(
            this: *mut gtk_sys::GtkSwitch,
            _gparamspec: glib_sys::gpointer,
            f: glib_sys::gpointer,
        ) where
            T: IsA<Switch>,
        {
            let f: &F = &*(f as *const F);
            f(&Switch::from_glib_borrow(this).unsafe_cast_ref())
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.to_glib_none().0 as *mut _,
                b"notify::active\0".as_ptr() as *mut _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    changed_active_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}