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

glib::wrapper! {
    /// [`WidgetPaintable`][crate::WidgetPaintable] is a [`gdk::Paintable`][crate::gdk::Paintable] that displays the contents
    /// of a widget.
    ///
    /// [`WidgetPaintable`][crate::WidgetPaintable] will also take care of the widget not being in a
    /// state where it can be drawn (like when it isn't shown) and just draw
    /// nothing or where it does not have a size (like when it is hidden) and
    /// report no size in that case.
    ///
    /// Of course, [`WidgetPaintable`][crate::WidgetPaintable] allows you to monitor widgets for size
    /// changes by emitting the [`invalidate-size`][struct@crate::gdk::Paintable#invalidate-size] signal
    /// whenever the size of the widget changes as well as for visual changes by
    /// emitting the [`invalidate-contents`][struct@crate::gdk::Paintable#invalidate-contents] signal whenever
    /// the widget changes.
    ///
    /// You can use a [`WidgetPaintable`][crate::WidgetPaintable] everywhere a [`gdk::Paintable`][crate::gdk::Paintable] is allowed,
    /// including using it on a [`Picture`][crate::Picture] (or one of its parents) that it was
    /// set on itself via gtk_picture_set_paintable(). The paintable will take care
    /// of recursion when this happens. If you do this however, ensure that the
    /// [`can-shrink`][struct@crate::Picture#can-shrink] property is set to [`true`] or you might
    /// end up with an infinitely growing widget.
    ///
    /// ## Properties
    ///
    ///
    /// #### `widget`
    ///  The observed widget or [`None`] if none.
    ///
    /// Readable | Writeable
    ///
    /// # Implements
    ///
    /// [`trait@glib::ObjectExt`], [`trait@gdk::prelude::PaintableExt`]
    #[doc(alias = "GtkWidgetPaintable")]
    pub struct WidgetPaintable(Object<ffi::GtkWidgetPaintable, ffi::GtkWidgetPaintableClass>) @implements gdk::Paintable;

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

impl WidgetPaintable {
    /// Creates a new widget paintable observing the given widget.
    /// ## `widget`
    /// a [`Widget`][crate::Widget]
    ///
    /// # Returns
    ///
    /// a new [`WidgetPaintable`][crate::WidgetPaintable]
    #[doc(alias = "gtk_widget_paintable_new")]
    pub fn new(widget: Option<&impl IsA<Widget>>) -> WidgetPaintable {
        assert_initialized_main_thread!();
        unsafe {
            from_glib_full(ffi::gtk_widget_paintable_new(
                widget.map(|p| p.as_ref()).to_glib_none().0,
            ))
        }
    }

    /// Returns the widget that is observed or [`None`] if none.
    ///
    /// # Returns
    ///
    /// the observed widget.
    #[doc(alias = "gtk_widget_paintable_get_widget")]
    #[doc(alias = "get_widget")]
    pub fn widget(&self) -> Option<Widget> {
        unsafe { from_glib_none(ffi::gtk_widget_paintable_get_widget(self.to_glib_none().0)) }
    }

    /// Sets the widget that should be observed.
    /// ## `widget`
    /// the widget to observe
    #[doc(alias = "gtk_widget_paintable_set_widget")]
    pub fn set_widget(&self, widget: Option<&impl IsA<Widget>>) {
        unsafe {
            ffi::gtk_widget_paintable_set_widget(
                self.to_glib_none().0,
                widget.map(|p| p.as_ref()).to_glib_none().0,
            );
        }
    }

    #[doc(alias = "widget")]
    pub fn connect_widget_notify<F: Fn(&Self) + 'static>(&self, f: F) -> SignalHandlerId {
        unsafe extern "C" fn notify_widget_trampoline<F: Fn(&WidgetPaintable) + 'static>(
            this: *mut ffi::GtkWidgetPaintable,
            _param_spec: glib::ffi::gpointer,
            f: glib::ffi::gpointer,
        ) {
            let f: &F = &*(f as *const F);
            f(&from_glib_borrow(this))
        }
        unsafe {
            let f: Box_<F> = Box_::new(f);
            connect_raw(
                self.as_ptr() as *mut _,
                b"notify::widget\0".as_ptr() as *const _,
                Some(transmute::<_, unsafe extern "C" fn()>(
                    notify_widget_trampoline::<F> as *const (),
                )),
                Box_::into_raw(f),
            )
        }
    }
}

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