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// Take a look at the license at the top of the repository in the LICENSE file.

use crate::ContentProvider;
use glib::translate::*;
use glib::IsA;

// rustdoc-stripper-ignore-next
/// Trait containing manually implemented methods of [`ContentProvider`](crate::ContentProvider).
pub trait ContentProviderExtManual {
    /// Gets the contents of @self stored in @value.
    ///
    /// The @value will have been initialized to the `GType` the value should be
    /// provided in. This given `GType` does not need to be listed in the formats
    /// returned by [`ContentProviderExt::formats()`][crate::prelude::ContentProviderExt::formats()]. However, if the
    /// given `GType` is not supported, this operation can fail and
    /// `G_IO_ERROR_NOT_SUPPORTED` will be reported.
    ///
    /// # Returns
    ///
    /// [`true`] if the value was set successfully. Otherwise
    ///   @error will be set to describe the failure.
    ///
    /// ## `value`
    /// the `GValue` to fill
    #[doc(alias = "gdk_content_provider_get_value")]
    fn value(&self, type_: glib::Type) -> Result<glib::Value, glib::Error>;
}

impl<O: IsA<ContentProvider>> ContentProviderExtManual for O {
    fn value(&self, type_: glib::Type) -> Result<glib::Value, glib::Error> {
        unsafe {
            let mut error = std::ptr::null_mut();
            let mut value = glib::Value::from_type(type_);
            let _ = ffi::gdk_content_provider_get_value(
                self.as_ref().to_glib_none().0,
                value.to_glib_none_mut().0,
                &mut error,
            );
            if error.is_null() {
                Ok(value)
            } else {
                Err(from_glib_full(error))
            }
        }
    }
}