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

use crate::{BoolFilter, Expression};
use glib::translate::*;

impl BoolFilter {
    /// Creates a new bool filter.
    /// ## `expression`
    /// The expression to evaluate
    ///
    /// # Returns
    ///
    /// a new [`BoolFilter`][crate::BoolFilter]
    #[doc(alias = "gtk_bool_filter_new")]
    pub fn new<E: AsRef<Expression>>(expression: Option<&E>) -> Self {
        assert_initialized_main_thread!();
        if let Some(e) = expression {
            if !e.as_ref().value_type().is_a(glib::Type::BOOL) {
                panic!("BoolFilter::new must take either None or an expression that evaluates to a boolean.");
            }
        }
        unsafe {
            from_glib_full(ffi::gtk_bool_filter_new(
                expression.map(|e| e.as_ref()).to_glib_full(),
            ))
        }
    }

    /// Sets the expression that the filter uses to check if items
    /// should be filtered.
    ///
    /// The expression must have a value type of `G_TYPE_BOOLEAN`.
    /// ## `expression`
    /// a [`Expression`][crate::Expression]
    #[doc(alias = "gtk_bool_filter_set_expression")]
    pub fn set_expression<E: AsRef<Expression>>(&self, expression: Option<&E>) {
        if let Some(e) = expression {
            if !e.as_ref().value_type().is_a(glib::Type::BOOL) {
                panic!("BoolFilter::set_expression must take either None or an expression that evaluates to a boolean.");
            }
        }
        unsafe {
            ffi::gtk_bool_filter_set_expression(
                self.to_glib_none().0,
                expression.map(|e| e.as_ref()).to_glib_none().0,
            );
        }
    }
}