kael 0.2.0

GPU-accelerated native UI framework for Rust — build desktop apps with Metal, DirectX, and Vulkan rendering
Documentation 
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use crate::{
    App, Bounds, Element, GlobalElementId, Hitbox, InspectorElementId, InteractiveElement,
    Interactivity, IntoElement, LayoutId, Pixels, SharedString, StyleRefinement, Styled, Window,
};
use util::ResultExt;

/// An icon element backed by the generated build-time icon atlas.
pub struct Icon {
    interactivity: Interactivity,
    name: SharedString,
}

/// Create a built-in icon element from the generated icon atlas.
#[track_caller]
pub fn icon(name: impl Into<SharedString>) -> Icon {
    Icon {
        interactivity: Interactivity::new(),
        name: name.into(),
    }
}

impl Element for Icon {
    type RequestLayoutState = ();
    type PrepaintState = Option<Hitbox>;

    fn id(&self) -> Option<crate::ElementId> {
        self.interactivity.element_id.clone()
    }

    fn source_location(&self) -> Option<&'static std::panic::Location<'static>> {
        self.interactivity.source_location()
    }

    fn request_layout(
        &mut self,
        global_id: Option<&GlobalElementId>,
        inspector_id: Option<&InspectorElementId>,
        window: &mut Window,
        cx: &mut App,
    ) -> (LayoutId, Self::RequestLayoutState) {
        let layout_id = self.interactivity.request_layout(
            global_id,
            inspector_id,
            window,
            cx,
            |style, window, cx| window.request_layout(style, None, cx),
        );
        (layout_id, ())
    }

    fn prepaint(
        &mut self,
        global_id: Option<&GlobalElementId>,
        inspector_id: Option<&InspectorElementId>,
        bounds: Bounds<Pixels>,
        _request_layout: &mut Self::RequestLayoutState,
        window: &mut Window,
        cx: &mut App,
    ) -> Option<Hitbox> {
        self.interactivity.prepaint(
            global_id,
            inspector_id,
            bounds,
            bounds.size,
            window,
            cx,
            |_, _, hitbox, _, _| hitbox,
        )
    }

    fn paint(
        &mut self,
        global_id: Option<&GlobalElementId>,
        inspector_id: Option<&InspectorElementId>,
        bounds: Bounds<Pixels>,
        _request_layout: &mut Self::RequestLayoutState,
        hitbox: &mut Option<Hitbox>,
        window: &mut Window,
        cx: &mut App,
    ) where
        Self: Sized,
    {
        self.interactivity.paint(
            global_id,
            inspector_id,
            bounds,
            hitbox.as_ref(),
            window,
            cx,
            |style, window, cx| {
                if let Some(color) = style.text.color {
                    window
                        .paint_icon(bounds, self.name.clone(), color, cx)
                        .log_err();
                }
            },
        )
    }
}

impl IntoElement for Icon {
    type Element = Self;

    fn into_element(self) -> Self::Element {
        self
    }
}

impl Styled for Icon {
    fn style(&mut self) -> &mut StyleRefinement {
        &mut self.interactivity.base_style
    }
}

impl InteractiveElement for Icon {
    fn interactivity(&mut self) -> &mut Interactivity {
        &mut self.interactivity
    }
}