guise-ui 1.5.2

A component library for gpui, Zed's GPU-accelerated UI framework: a themed palette, sizing tokens, 130+ composable components, a reactive state layer, and an in-app Safari-style inspector.
Documentation 
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//! `Checkbox` — a controlled boolean toggle with an optional label.

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

use super::{control_box_size, ClickHandler};
use crate::devtools::Probed;
use crate::reactive::Binding;
use crate::theme::{theme, ColorName, Size};

/// A controlled checkbox. Pass `checked` and a change
/// handler (via `cx.listener`); the parent view owns the value. Or hand it a
/// [`Binding`] via [`Checkbox::bind`] and skip the handler.
#[derive(IntoElement)]
pub struct Checkbox {
  id: ElementId,
  checked: bool,
  indeterminate: bool,
  label: Option<SharedString>,
  size: Size,
  color: ColorName,
  disabled: bool,
  binding: Option<Binding<bool>>,
  on_change: Option<ClickHandler>,
}

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

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

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

  /// Two-way bind the checked state. Overrides `checked`; clicks write the
  /// toggled value back through the binding, then run any `on_change`.
  pub fn bind(mut self, binding: Binding<bool>) -> Self {
    self.binding = Some(binding);
    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
  }
}

impl RenderOnce for Checkbox {
  fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
    let t = theme(cx);
    let checked = self.binding.as_ref().map_or(self.checked, |b| b.get(cx));
    let on = checked || self.indeterminate;
    let accent = t.color(self.color, t.primary_shade());
    let box_size = control_box_size(self.size);

    let mut check = div()
      .w(px(box_size))
      .h(px(box_size))
      .flex()
      .items_center()
      .justify_center()
      .rounded(px(t.radius(Size::Xs) + 2.0))
      .text_size(px(box_size * 0.7))
      .font_weight(FontWeight::BOLD);
    if on {
      check = check
        .bg(accent.hsla())
        .text_color(accent.contrasting().hsla())
        .child(SharedString::new_static(if self.indeterminate {
          "\u{2212}"
        } else {
          "\u{2713}"
        }));
    } else {
      check = check
        .bg(t.surface().hsla())
        .border_1()
        .border_color(t.border().hsla());
    }

    let mut row = div()
      .id(self.id)
      .flex()
      .items_center()
      .gap(px(8.0))
      .child(check);
    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),
      );
    }

    let element = if self.disabled {
      row.opacity(0.5)
    } else {
      if self.binding.is_some() || self.on_change.is_some() {
        let binding = self.binding;
        let handler = self.on_change;
        let next = !checked;
        row = row.on_click(move |ev, window, cx| {
          if let Some(binding) = &binding {
            binding.set(cx, next);
          }
          if let Some(handler) = &handler {
            handler(ev, window, cx);
          }
        });
      }
      row
    };

    element
      .probe("Checkbox")
      .attr("size", self.size.label())
      .attr_if("checked", self.checked)
      .attr_if("indeterminate", self.indeterminate)
      .attr_if("disabled", self.disabled)
  }
}