// 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::{
    prelude::*,
    signal::{connect_raw, SignalHandlerId},
    translate::*,
};
use std::{boxed::Box as Box_, fmt, mem, mem::transmute};

glib::wrapper! {
    /// [`SectionModel`][crate::SectionModel] is an interface that adds support for sections to list models.
    ///
    /// A [`SectionModel`][crate::SectionModel] groups successive items into so-called sections. List widgets
    /// like [`ListView`][crate::ListView] and [`GridView`][crate::GridView] then allow displaying section headers for
    /// these sections by installing a header factory.
    ///
    /// Many GTK list models support sections inherently, or they pass through the sections
    /// of a model they are wrapping.
    ///
    /// When the section groupings of a model change, the model will emit the
    /// [`sections-changed`][struct@crate::SectionModel#sections-changed] signal by calling the
    /// [`SectionModelExt::sections_changed()`][crate::prelude::SectionModelExt::sections_changed()] function. All sections in the given range
    /// then need to be queried again.
    /// The [`items-changed`][struct@crate::gio::ListModel#items-changed] signal has the same effect, all sections in
    /// that range are invalidated, too.
    ///
    /// ## Signals
    ///
    ///
    /// #### `sections-changed`
    ///  Emitted when the start-of-section state of some of the items in @model changes.
    ///
    /// Note that this signal does not specify the new section state of the
    /// items, they need to be queried manually. It is also not necessary for
    /// a model to change the section state of any of the items in the section
    /// model, though it would be rather useless to emit such a signal.
    ///
    /// The [`items-changed`][struct@crate::gio::ListModel#items-changed] implies the effect of the
    /// [`sections-changed`][struct@crate::SectionModel#sections-changed] signal for all the items
    /// it covers.
    ///
    ///
    /// <details><summary><h4>ListModel</h4></summary>
    ///
    ///
    /// #### `items-changed`
    ///  This signal is emitted whenever items were added to or removed
    /// from @list. At @position, @removed items were removed and @added
    /// items were added in their place.
    ///
    /// Note: If `removed != added`, the positions of all later items
    /// in the model change.
    ///
    ///
    /// </details>
    ///
    /// # Implements
    ///
    /// [`SectionModelExt`][trait@crate::prelude::SectionModelExt], [`trait@gio::prelude::ListModelExt`]
    #[doc(alias = "GtkSectionModel")]
    pub struct SectionModel(Interface<ffi::GtkSectionModel, ffi::GtkSectionModelInterface>) @requires gio::ListModel;

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

impl SectionModel {
    pub const NONE: Option<&'static SectionModel> = None;
}

mod sealed {
    pub trait Sealed {}
    impl<T: super::IsA<super::SectionModel>> Sealed for T {}
}

/// Trait containing all [`struct@SectionModel`] methods.
///
/// # Implementors
///
/// [`FilterListModel`][struct@crate::FilterListModel], [`FlattenListModel`][struct@crate::FlattenListModel], [`MapListModel`][struct@crate::MapListModel], [`MultiSelection`][struct@crate::MultiSelection], [`NoSelection`][struct@crate::NoSelection], [`SectionModel`][struct@crate::SectionModel], [`SingleSelection`][struct@crate::SingleSelection], [`SliceListModel`][struct@crate::SliceListModel], [`SortListModel`][struct@crate::SortListModel]
pub trait SectionModelExt: IsA<SectionModel> + sealed::Sealed + 'static {
    /// Query the section that covers the given position. The number of
    /// items in the section can be computed by `out_end - out_start`.
    ///
    /// If the position is larger than the number of items, a single
    /// range from n_items to G_MAXUINT will be returned.
    /// ## `position`
    /// the position of the item to query
    ///
    /// # Returns
    ///
    ///
    /// ## `out_start`
    /// the position of the first item in the section
    ///
    /// ## `out_end`
    /// the position of the first item not part of the section
    ///   anymore.
    #[doc(alias = "gtk_section_model_get_section")]
    #[doc(alias = "get_section")]
    fn section(&self, position: u32) -> (u32, u32) {
        unsafe {
            let mut out_start = mem::MaybeUninit::uninit();
            let mut out_end = mem::MaybeUninit::uninit();
            ffi::gtk_section_model_get_section(
                self.as_ref().to_glib_none().0,
                position,
                out_start.as_mut_ptr(),
                out_end.as_mut_ptr(),
            );
            (out_start.assume_init(), out_end.assume_init())
        }
    }

    #[doc(alias = "gtk_section_model_sections_changed")]
    fn sections_changed(&self, position: u32, n_items: u32) {
        unsafe {
            ffi::gtk_section_model_sections_changed(
                self.as_ref().to_glib_none().0,
                position,
                n_items,
            );
        }
    }

    /// Emitted when the start-of-section state of some of the items in @model changes.
    ///
    /// Note that this signal does not specify the new section state of the
    /// items, they need to be queried manually. It is also not necessary for
    /// a model to change the section state of any of the items in the section
    /// model, though it would be rather useless to emit such a signal.
    ///
    /// The [`items-changed`][struct@crate::gio::ListModel#items-changed] implies the effect of the
    /// [`sections-changed`][struct@crate::SectionModel#sections-changed] signal for all the items
    /// it covers.
    /// ## `position`
    /// The first item that may have changed
    /// ## `n_items`
    /// number of items with changes
    #[cfg(feature = "v4_12")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v4_12")))]
    #[doc(alias = "sections-changed")]
    fn connect_sections_changed<F: Fn(&Self, u32, u32) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn sections_changed_trampoline<
            P: IsA<SectionModel>,
            F: Fn(&P, u32, u32) + 'static,
        >(
            this: *mut ffi::GtkSectionModel,
            position: libc::c_uint,
            n_items: libc::c_uint,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(
                SectionModel::from_glib_borrow(this).unsafe_cast_ref(),
                position,
                n_items,
            )
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"sections-changed\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    sections_changed_trampoline::<Self, F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

impl<O: IsA<SectionModel>> SectionModelExt for O {}

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