guise-ui 0.2.0

A Mantine-inspired component library for gpui, Zed's GPU-accelerated UI framework.
Documentation 
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//! `Switch` — a controlled on/off toggle styled as a sliding track.

use gpui::prelude::*;
use gpui::{div, px, App, ClickEvent, ElementId, IntoElement, SharedString, Window};

use super::ClickHandler;
use crate::theme::{theme, ColorName, Size};

/// A controlled switch. The Mantine `Switch`.
#[derive(IntoElement)]
pub struct Switch {
    id: ElementId,
    checked: bool,
    label: Option<SharedString>,
    size: Size,
    color: ColorName,
    disabled: bool,
    on_change: Option<ClickHandler>,
}

impl Switch {
    pub fn new(id: impl Into<ElementId>) -> Self {
        Switch {
            id: id.into(),
            checked: false,
            label: None,
            size: Size::Md,
            color: ColorName::Blue,
            disabled: false,
            on_change: None,
        }
    }

    pub fn checked(mut self, checked: bool) -> Self {
        self.checked = checked;
        self
    }

    pub fn label(mut self, label: impl Into<SharedString>) -> Self {
        self.label = Some(label.into());
        self
    }

    pub fn size(mut self, size: Size) -> Self {
        self.size = size;
        self
    }

    pub fn color(mut self, color: ColorName) -> Self {
        self.color = color;
        self
    }

    pub fn disabled(mut self, disabled: bool) -> Self {
        self.disabled = disabled;
        self
    }

    pub fn on_change(
        mut self,
        handler: impl Fn(&ClickEvent, &mut Window, &mut App) + 'static,
    ) -> Self {
        self.on_change = Some(Box::new(handler));
        self
    }

    fn track_height(&self) -> f32 {
        match self.size {
            Size::Xs => 16.0,
            Size::Sm => 20.0,
            Size::Md => 24.0,
            Size::Lg => 30.0,
            Size::Xl => 36.0,
        }
    }
}

impl RenderOnce for Switch {
    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
        let t = theme(cx);
        let height = self.track_height();
        let width = (height * 1.85).round();
        let knob = height - 4.0;
        let accent = t.color(self.color, t.primary_shade());

        let track_bg = if self.checked {
            accent.hsla()
        } else {
            t.color(ColorName::Gray, if t.scheme.is_dark() { 6 } else { 4 }).hsla()
        };
        let knob_x = if self.checked { width - knob - 2.0 } else { 2.0 };

        let track = div()
            .w(px(width))
            .h(px(height))
            .rounded(px(height))
            .bg(track_bg)
            .relative()
            .child(
                div()
                    .absolute()
                    .top(px(2.0))
                    .left(px(knob_x))
                    .w(px(knob))
                    .h(px(knob))
                    .rounded(px(knob))
                    .bg(t.white.hsla()),
            );

        let mut row = div().id(self.id).flex().items_center().gap(px(8.0)).child(track);
        if let Some(label) = self.label {
            row = row.child(
                div()
                    .text_size(px(t.font_size(self.size)))
                    .text_color(t.text().hsla())
                    .child(label),
            );
        }

        if self.disabled {
            row.opacity(0.5)
        } else {
            if let Some(handler) = self.on_change {
                row = row.on_click(handler);
            }
            row
        }
    }
}