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use glib::translate::*;

glib::wrapper! {
    /// An opaque datatype.
    ///
    /// Ignore all its fields and initialize the iter with [`RegionExt::start_region_iter()`][crate::prelude::RegionExt::start_region_iter()].
    #[doc(alias = "GtkSourceRegionIter")]
    pub struct RegionIter(BoxedInline<ffi::GtkSourceRegionIter>);
}

impl RegionIter {
    /// Gets the subregion at this iterator.
    ///
    /// # Returns
    ///
    /// [`true`] if @start and @end have been set successfully (if non-[`None`]),
    ///   or [`false`] if @self is the end iterator or if the region is empty.
    ///
    /// ## `start`
    /// iterator to initialize with the subregion start, or [`None`].
    ///
    /// ## `end`
    /// iterator to initialize with the subregion end, or [`None`].
    #[doc(alias = "gtk_source_region_iter_get_subregion")]
    #[doc(alias = "get_subregion")]
    pub fn subregion(&mut self, start: &mut gtk::TextIter, end: &mut gtk::TextIter) -> bool {
        unsafe {
            from_glib(ffi::gtk_source_region_iter_get_subregion(
                self.to_glib_none_mut().0,
                start.to_glib_none_mut().0,
                end.to_glib_none_mut().0,
            ))
        }
    }

    ///
    /// # Returns
    ///
    /// whether @self is the end iterator.
    #[doc(alias = "gtk_source_region_iter_is_end")]
    pub fn is_end(&self) -> bool {
        unsafe {
            from_glib(ffi::gtk_source_region_iter_is_end(mut_override(
                self.to_glib_none().0,
            )))
        }
    }

    /// Moves @self to the next subregion.
    ///
    /// # Returns
    ///
    /// [`true`] if @self moved and is dereferenceable, or [`false`] if @self has
    ///   been set to the end iterator.
    #[allow(clippy::should_implement_trait)]
    #[doc(alias = "gtk_source_region_iter_next")]
    pub fn next(&mut self) -> bool {
        unsafe { from_glib(ffi::gtk_source_region_iter_next(self.to_glib_none_mut().0)) }
    }
}