xengui 0.2.2

xengui: a reactive gui library in rust
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// SPDX-License-Identifier: Apache-2.0
use smol_str::SmolStr;

use crate::{
    EventCtx,
    EventStatus,
    InputEvent,
    Interaction,
    LayoutBox,
    LayoutContext,
    PaintContext,
    Style,
};

use std::any::Any;

pub trait Widget: Any {
    fn as_any(&self) -> &dyn Any;

    fn as_any_mut(&mut self) -> &mut dyn Any;

    fn get_key(&self) -> Option<&SmolStr> {
        None
    }

    fn is_dirty(&self) -> bool;

    fn set_dirty(&mut self, dirty: bool);

    fn style(&self) -> &Style;

    fn style_mut(&mut self) -> &mut Style;

    fn children(&self) -> &[Box<dyn Widget>] {
        &[]
    }

    fn children_mut(&mut self) -> Option<&mut Vec<Box<dyn Widget>>> {
        None
    }

    fn measure(&self, ctx: &mut LayoutContext) -> (f32, f32);

    fn layout(&mut self, rect: LayoutBox);

    fn layout_box(&self) -> &LayoutBox;

    fn paint(&self, ctx: &mut PaintContext);

    fn hit_test(&self, point: (f32, f32)) -> bool {
        let b = self.layout_box();

        if point.0 < b.x || point.0 > b.x + b.width || point.1 < b.y || point.1 > b.y + b.height {
            return false;
        }

        let Some(border) = &self.style().border else {
            return true;
        };

        let radius = border.radius.value();

        if radius <= 0.0 {
            return true;
        }

        let r = radius.min(b.width * 0.5).min(b.height * 0.5);

        let local_x = point.0 - b.x;
        let local_y = point.1 - b.y;

        if local_x >= r && local_x <= b.width - r {
            return true;
        }

        if local_y >= r && local_y <= b.height - r {
            return true;
        }

        let cx = if local_x < r { r } else { b.width - r };

        let cy = if local_y < r { r } else { b.height - r };

        let dx = local_x - cx;
        let dy = local_y - cy;

        dx * dx + dy * dy <= r * r
    }

    fn interaction(&self) -> Option<&Interaction> {
        None
    }

    fn interaction_mut(&mut self) -> Option<&mut Interaction> {
        None
    }

    fn transfer_interaction_state(&mut self, old: &dyn Widget) -> bool {
        if let (Some(new), Some(old)) = (self.interaction_mut(), old.interaction()) {
            let changed =
                new.hovered != old.hovered ||
                new.pressed != old.pressed ||
                new.focused != old.focused;
            new.transfer_from(old);
            changed
        } else {
            false
        }
    }

    fn event(&mut self, event: &InputEvent, ctx: &mut EventCtx) -> EventStatus {
        let status = match self.interaction_mut() {
            Some(interaction) if interaction.is_active() => interaction.handle(event, ctx),
            _ => EventStatus::Ignored,
        };

        if matches!(status, EventStatus::Handled) {
            self.set_dirty(true);
        }

        status
    }

    fn content_eq(&self, _other: &dyn Widget) -> bool {
        false
    }

    fn after_interaction_transfer(&mut self) {}

    fn transfer_measured_state(&mut self, _old: &dyn Widget) {}

    fn blink_interval(&self) -> Option<std::time::Duration> {
        None
    }
}