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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License in the LICENSE-APACHE file or at:
//     https://www.apache.org/licenses/LICENSE-2.0

//! A separator

use std::fmt::Debug;
use std::marker::PhantomData;

use crate::Menu;
use kas::{event, prelude::*};

/// A separator
///
/// This widget draws a bar when in a list.
#[derive(Clone, Debug, Default, Widget)]
#[handler(msg=M)]
pub struct Separator<M: Debug + 'static> {
    #[widget_core]
    core: CoreData,
    _msg: PhantomData<M>,
}

impl Separator<event::VoidMsg> {
    /// Construct a frame, with void message type
    #[inline]
    pub fn new() -> Self {
        Separator {
            core: Default::default(),
            _msg: Default::default(),
        }
    }
}

impl<M: Debug> Separator<M> {
    /// Construct a frame, with inferred message type
    ///
    /// This may be useful when embedding a separator in a list with
    /// a given message type.
    #[inline]
    pub fn infer() -> Self {
        Separator {
            core: Default::default(),
            _msg: Default::default(),
        }
    }
}

impl<M: Debug> Layout for Separator<M> {
    fn size_rules(&mut self, size_handle: &mut dyn SizeHandle, axis: AxisInfo) -> SizeRules {
        let margins = size_handle.frame_margins();
        SizeRules::extract_fixed(axis, size_handle.separator(), margins)
    }

    fn draw(&self, draw_handle: &mut dyn DrawHandle, _: &event::ManagerState, _: bool) {
        draw_handle.separator(self.core.rect);
    }
}

/// A separator is a valid menu widget
impl<M: Debug> Menu for Separator<M> {}