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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

//! Filler widget

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

/// A space filler
///
/// This widget has zero minimum size but can expand according to the given
/// stretch priority.
#[derive(Clone, Debug, Default, Widget)]
pub struct Filler {
    #[widget_core]
    core: CoreData,
    horiz: Stretch,
    vert: Stretch,
}

impl Layout for Filler {
    fn size_rules(&mut self, _: &mut dyn SizeHandle, axis: AxisInfo) -> SizeRules {
        let stretch = if axis.is_horizontal() {
            self.horiz
        } else {
            self.vert
        };
        SizeRules::empty(stretch)
    }

    fn draw(&self, _: &mut dyn DrawHandle, _: &event::ManagerState, _: bool) {}
}

impl Filler {
    /// Construct a filler with priority [`Stretch::Filler`]
    pub fn new() -> Self {
        Filler::with(Stretch::Filler)
    }

    /// Construct a filler with priority [`Stretch::Low`]
    pub fn low() -> Self {
        Filler::with(Stretch::Low)
    }

    /// Construct a filler with priority [`Stretch::High`]
    pub fn high() -> Self {
        Filler::with(Stretch::High)
    }

    /// Construct a filler with priority [`Stretch::Maximize`]
    pub fn maximize() -> Self {
        Filler::with(Stretch::Maximize)
    }

    /// Construct with a custom stretch priority
    pub fn with(stretch: Stretch) -> Self {
        Filler::with_hv(stretch, stretch)
    }

    /// Construct with custom horizontal and vertical priorities
    pub fn with_hv(horiz: Stretch, vert: Stretch) -> Self {
        let core = Default::default();
        Filler { core, horiz, vert }
    }
}