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//! Field component for wrapping form inputs with labels, descriptions, and error states.
use crate::theme::{ActiveTheme, Themeable};
use crate::traits::disableable::Disableable;
use crate::traits::labelable::Labelable;
use gpui::{
div, prelude::FluentBuilder, rems, AnyElement, App, IntoElement, ParentElement, RenderOnce,
SharedString, Styled, Window,
};
/// Creates a new Field builder.
pub fn field() -> Field {
Field::new()
}
/// Label position relative to the input.
#[derive(Default, Clone, Copy, PartialEq, Eq)]
pub enum LabelPosition {
/// Label is displayed above the input (default).
#[default]
Above,
/// Label is displayed beside the input (horizontal layout).
Beside,
}
/// A field component for wrapping form inputs with labels, descriptions, and error states.
///
/// # Example
///
/// ```ignore
/// field()
/// .label("Username")
/// .description("Enter your username")
/// .required(true)
/// .child(input("username"))
/// ```
#[derive(IntoElement)]
pub struct Field {
label: Option<SharedString>,
description: Option<SharedString>,
error: Option<SharedString>,
required: bool,
label_position: LabelPosition,
child: Option<AnyElement>,
disabled: bool,
}
impl Field {
/// Create a new Field.
pub fn new() -> Self {
Field {
label: None,
description: None,
error: None,
required: false,
label_position: LabelPosition::default(),
child: None,
disabled: false,
}
}
/// Set the description/help text for this field.
pub fn description(mut self, description: impl Into<SharedString>) -> Self {
self.description = Some(description.into());
self
}
/// Set an error message for this field.
/// When set, the field will display in an error state.
pub fn error(mut self, error: impl Into<SharedString>) -> Self {
self.error = Some(error.into());
self
}
/// Mark this field as required.
/// Displays a required indicator next to the label.
pub fn required(mut self, required: bool) -> Self {
self.required = required;
self
}
/// Set the label position (above or beside the input).
pub fn label_position(mut self, position: LabelPosition) -> Self {
self.label_position = position;
self
}
/// Set the child element (typically a form input).
pub fn child(mut self, child: impl IntoElement) -> Self {
self.child = Some(child.into_any_element());
self
}
}
impl Default for Field {
fn default() -> Self {
Self::new()
}
}
impl Labelable for Field {
fn label(mut self, label: impl Into<SharedString>) -> Self {
self.label = Some(label.into());
self
}
}
impl Disableable for Field {
fn is_disabled(&self) -> bool {
self.disabled
}
fn disabled(mut self, disabled: bool) -> Self {
self.disabled = disabled;
self
}
}
impl RenderOnce for Field {
fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
let theme = cx.theme();
let has_error = self.error.is_some();
let disabled = self.disabled;
let label_color = if disabled {
theme.fg_disabled()
} else if has_error {
theme.danger()
} else {
theme.fg()
};
let label_element = self.label.map(|label_text| {
div()
.flex()
.gap(rems(0.25))
.child(
div()
.text_sm()
.font_weight(gpui::FontWeight::MEDIUM)
.text_color(label_color)
.child(label_text),
)
.when(self.required && !disabled, |this| {
this.child(div().text_sm().text_color(theme.danger()).child("*"))
})
});
let description_element = self.description.map(|desc| {
div()
.text_xs()
.text_color(if disabled {
theme.fg_disabled()
} else {
theme.fg_muted()
})
.child(desc)
});
let error_element = self
.error
.map(|err| div().text_xs().text_color(theme.danger()).child(err));
match self.label_position {
LabelPosition::Above => {
// Vertical layout: label above input
div()
.flex()
.flex_col()
.gap(rems(0.375))
.when(disabled, |el| el.cursor_not_allowed())
.when_some(label_element, |container, label| container.child(label))
.when_some(description_element, |container, desc| container.child(desc))
.when_some(self.child, |container, child| container.child(child))
.when_some(error_element, |container, err| container.child(err))
}
LabelPosition::Beside => {
// Horizontal layout: label beside input
div()
.flex()
.flex_col()
.gap(rems(0.375))
.when(disabled, |el| el.cursor_not_allowed())
.child(
div()
.flex()
.items_start()
.gap(rems(0.75))
.when_some(label_element, |container, label| {
container.child(
div()
.flex()
.flex_col()
.gap(rems(0.25))
.pt(rems(0.5)) // Align with input
.min_w(rems(8.0))
.child(label)
.when_some(description_element, |this, desc| {
this.child(desc)
}),
)
})
.when_some(self.child, |container, child| {
container.child(div().flex_1().child(child))
}),
)
.when_some(error_element, |container, err| {
container.child(
div()
.pl(rems(8.75)) // Align with input (label width + gap)
.child(err),
)
})
}
}
}
}