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// This file was generated by gir (https://github.com/gtk-rs/gir)
// from gir-files (https://github.com/gtk-rs/gir-files)
// DO NOT EDIT

use glib::object::IsA;
use glib::translate::*;
use std::fmt;
use std::ptr;

glib::wrapper! {
    /// [`MenuAttributeIter`][crate::MenuAttributeIter] is an opaque structure type. You must access it
    /// using the functions below.
    ///
    /// This is an Abstract Base Class, you cannot instantiate it.
    ///
    /// # Implements
    ///
    /// [`MenuAttributeIterExt`][trait@crate::prelude::MenuAttributeIterExt], [`trait@glib::ObjectExt`]
    #[doc(alias = "GMenuAttributeIter")]
    pub struct MenuAttributeIter(Object<ffi::GMenuAttributeIter, ffi::GMenuAttributeIterClass>);

    match fn {
        type_ => || ffi::g_menu_attribute_iter_get_type(),
    }
}

pub const NONE_MENU_ATTRIBUTE_ITER: Option<&MenuAttributeIter> = None;

/// Trait containing all [`struct@MenuAttributeIter`] methods.
///
/// # Implementors
///
/// [`MenuAttributeIter`][struct@crate::MenuAttributeIter]
pub trait MenuAttributeIterExt: 'static {
    /// This function combines `g_menu_attribute_iter_next()` with
    /// `g_menu_attribute_iter_get_name()` and `g_menu_attribute_iter_get_value()`.
    ///
    /// First the iterator is advanced to the next (possibly first) attribute.
    /// If that fails, then [`false`] is returned and there are no other
    /// effects.
    ///
    /// If successful, `name` and `value` are set to the name and value of the
    /// attribute that has just been advanced to. At this point,
    /// `g_menu_attribute_iter_get_name()` and `g_menu_attribute_iter_get_value()` will
    /// return the same values again.
    ///
    /// The value returned in `name` remains valid for as long as the iterator
    /// remains at the current position. The value returned in `value` must
    /// be unreffed using `g_variant_unref()` when it is no longer in use.
    ///
    /// # Returns
    ///
    /// [`true`] on success, or [`false`] if there is no additional
    ///  attribute
    ///
    /// ## `out_name`
    /// the type of the attribute
    ///
    /// ## `value`
    /// the attribute value
    #[doc(alias = "g_menu_attribute_iter_get_next")]
    #[doc(alias = "get_next")]
    fn next(&self) -> Option<(glib::GString, glib::Variant)>;
}

impl<O: IsA<MenuAttributeIter>> MenuAttributeIterExt for O {
    fn next(&self) -> Option<(glib::GString, glib::Variant)> {
        unsafe {
            let mut out_name = ptr::null();
            let mut value = ptr::null_mut();
            let ret = from_glib(ffi::g_menu_attribute_iter_get_next(
                self.as_ref().to_glib_none().0,
                &mut out_name,
                &mut value,
            ));
            if ret {
                Some((from_glib_none(out_name), from_glib_full(value)))
            } else {
                None
            }
        }
    }
}

impl fmt::Display for MenuAttributeIter {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.write_str("MenuAttributeIter")
    }
}