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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::StateFlags;
use crate::WidgetPath;
use glib::object::IsA;
use glib::translate::*;
use std::fmt;

glib::wrapper! {
    /// GtkStyleProvider is an interface used to provide style information to a [`StyleContext`][crate::StyleContext].
    /// See [`StyleContextExt::add_provider()`][crate::prelude::StyleContextExt::add_provider()] and [`StyleContext::add_provider_for_screen()`][crate::StyleContext::add_provider_for_screen()].
    ///
    /// # Implements
    ///
    /// [`StyleProviderExt`][trait@crate::prelude::StyleProviderExt]
    #[doc(alias = "GtkStyleProvider")]
    pub struct StyleProvider(Interface<ffi::GtkStyleProvider, ffi::GtkStyleProviderIface>);

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

pub const NONE_STYLE_PROVIDER: Option<&StyleProvider> = None;

/// Trait containing all [`struct@StyleProvider`] methods.
///
/// # Implementors
///
/// [`CssProvider`][struct@crate::CssProvider], [`Settings`][struct@crate::Settings], [`StyleProperties`][struct@crate::StyleProperties], [`StyleProvider`][struct@crate::StyleProvider]
pub trait StyleProviderExt: 'static {
    /// Looks up a widget style property as defined by `self` for
    /// the widget represented by `path`.
    /// ## `path`
    /// [`WidgetPath`][crate::WidgetPath] to query
    /// ## `state`
    /// state to query the style property for
    /// ## `pspec`
    /// The [`glib::ParamSpec`][crate::glib::ParamSpec] to query
    ///
    /// # Returns
    ///
    /// [`true`] if the property was found and has a value, [`false`] otherwise
    ///
    /// ## `value`
    /// return location for the property value
    #[doc(alias = "gtk_style_provider_get_style_property")]
    #[doc(alias = "get_style_property")]
    fn style_property(
        &self,
        path: &WidgetPath,
        state: StateFlags,
        pspec: &glib::ParamSpec,
    ) -> Option<glib::Value>;
}

impl<O: IsA<StyleProvider>> StyleProviderExt for O {
    fn style_property(
        &self,
        path: &WidgetPath,
        state: StateFlags,
        pspec: &glib::ParamSpec,
    ) -> Option<glib::Value> {
        unsafe {
            let mut value = glib::Value::uninitialized();
            let ret = from_glib(ffi::gtk_style_provider_get_style_property(
                self.as_ref().to_glib_none().0,
                path.to_glib_none().0,
                state.into_glib(),
                pspec.to_glib_none().0,
                value.to_glib_none_mut().0,
            ));
            if ret {
                Some(value)
            } else {
                None
            }
        }
    }
}

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