egui_styled 0.8.0

Tailwind-style utility styling for egui: per-widget hover/focus/active variants, design tokens, and composable style functions.
Documentation 
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use egui::{ComboBox, Id, InnerResponse, RichText, Shape, Ui, WidgetText};

use crate::{
    impl_style_builders,
    state::PseudoState,
    style::shared_style::{
        SharedStyle, paint_shadows, paint_widget_gradient_underlay, paint_widget_overlays,
        render_scoped,
    },
};

pub struct StyledComboBox {
    id_source: Id,
    selected_text: WidgetText,
    width: Option<f32>,
    id_override: Option<Id>,
    style: SharedStyle,
}

impl StyledComboBox {
    pub fn new(
        id_source: impl std::hash::Hash + std::fmt::Debug,
        selected_text: impl Into<WidgetText>,
    ) -> Self {
        Self {
            id_source: Id::new(id_source),
            selected_text: selected_text.into(),
            width: None,
            id_override: None,
            style: SharedStyle::default(),
        }
    }

    pub fn width(mut self, w: f32) -> Self {
        self.width = Some(w);
        self
    }

    /// Override the auto-generated widget id. Pins pseudo-state across
    /// conditional rendering - see [`crate::StyledButton::id`] for the rationale.
    pub fn id(mut self, id: impl std::hash::Hash + std::fmt::Debug) -> Self {
        self.id_override = Some(Id::new(id));
        self
    }

    /// Doesn't implement [`crate::StyledContainer`]: unlike `StyledFrame`/`StyledRow`/
    /// `StyledColumn`, the body closure only renders when the dropdown is open,
    /// so the return type mirrors egui's own `ComboBox::show_ui` (`InnerResponse<Option<()>>`)
    /// rather than the always-run `InnerResponse<R>` shape.
    pub fn show(
        self,
        ui: &mut Ui,
        menu_contents: impl FnOnce(&mut Ui),
    ) -> InnerResponse<Option<()>> {
        let visible = self.style.visible != Some(false);

        let id = self
            .id_override
            .unwrap_or_else(|| ui.make_persistent_id(self.id_source));
        let pseudo = PseudoState::load(ui, id);

        let per = self.style.resolve_per_state(ui.visuals());

        let result = render_scoped(ui, visible, |ui| {
            let shadow_idx = ui.painter().add(Shape::Noop);
            let gradient_idx = ui.painter().add(Shape::Noop);
            let result = ui
                .scope(|ui| {
                    SharedStyle::apply_to_visuals(&per, pseudo, ui.visuals_mut());

                    // Apply font to selected_text if requested.
                    let selected_text: WidgetText = if let Some(size) = self.style.font_size {
                        let rt = match self.selected_text {
                            WidgetText::RichText(rt) => (*rt).clone().size(size),
                            other => RichText::new(other.text().to_string()).size(size),
                        };
                        rt.into()
                    } else {
                        self.selected_text
                    };

                    let mut cb =
                        ComboBox::from_id_salt(self.id_source).selected_text(selected_text);
                    // Resolve width via the centralized resolver; explicit .width()
                    // takes precedence over style-based sizing.
                    let sz = self
                        .style
                        .resolve_size(ui.available_width(), ui.available_height());
                    if let Some(w) = self.width {
                        cb = cb.width(w);
                    } else if let Some(w) = sz.definite_w.or(sz.min_w) {
                        cb = cb.width(w);
                    }
                    if let Some(w) = sz.max_w {
                        ui.set_max_width(w);
                    }

                    let mut wrapper = egui::Frame::new();
                    if per.margin != egui::Margin::ZERO {
                        wrapper = wrapper.outer_margin(per.margin);
                    }
                    if per.padding != egui::Margin::ZERO {
                        wrapper = wrapper.inner_margin(per.padding);
                    }
                    wrapper.show(ui, |ui| cb.show_ui(ui, menu_contents)).inner
                })
                .inner;

            let resolved = SharedStyle::for_response(&per, &result.response);
            paint_widget_gradient_underlay(
                ui,
                gradient_idx,
                result.response.rect,
                per.corner_radius,
                resolved,
            );
            paint_widget_overlays(ui, result.response.rect, resolved);
            // Use the outer response rect for shadows.
            paint_shadows(
                ui,
                shadow_idx,
                result.response.rect,
                per.corner_radius,
                &self.style.shadows,
            );
            result
        });

        let response = &result.response;
        PseudoState::from_response(response).store(ui, id);

        if let Some(icon) = per.cursor_icon
            && response.hovered()
        {
            ui.ctx().set_cursor_icon(icon);
        }

        result
    }
}

impl_style_builders!(StyledComboBox);