gtk/
switch.rs

1// Copyright 2013-2017, The Gtk-rs Project Developers.
2// See the COPYRIGHT file at the top-level directory of this distribution.
3// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>
4
5use glib::object::{Cast, IsA};
6use glib::signal::{connect_raw, SignalHandlerId};
7use glib::translate::*;
8use glib_sys;
9use gtk_sys;
10use std::boxed::Box as Box_;
11use std::mem::transmute;
12use Switch;
13
14pub trait SwitchExtManual: 'static {
15    fn connect_changed_active<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId;
16}
17
18impl<O: IsA<Switch>> SwitchExtManual for O {
19    fn connect_changed_active<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
20        unsafe extern "C" fn changed_active_trampoline<T, F: Fn(&T) + 'static>(
21            this: *mut gtk_sys::GtkSwitch,
22            _gparamspec: glib_sys::gpointer,
23            f: glib_sys::gpointer,
24        ) where
25            T: IsA<Switch>,
26        {
27            let f: &F = &*(f as *const F);
28            f(&Switch::from_glib_borrow(this).unsafe_cast())
29        }
30        unsafe {
31            let f: Box_<F> = Box_::new(f);
32            connect_raw(
33                self.to_glib_none().0 as *mut _,
34                b"notify::active\0".as_ptr() as *mut _,
35                Some(transmute(changed_active_trampoline::<Self, F> as usize)),
36                Box_::into_raw(f),
37            )
38        }
39    }
40}