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//! Textarea component for multi-line text input.
//!
//! A styled wrapper around the `text_area()` element that provides form-friendly
//! styling with borders, padding, and theme colors.
use gpui::{
div, prelude::*, px, rems, App, Entity, FocusHandle, Focusable, IntoElement, ParentElement,
Pixels, RenderOnce, SharedString, Styled, Window,
};
use crate::elements::input::text_area;
use crate::input::InputState;
use crate::theme::{ActiveTheme, Themeable};
use crate::traits::disableable::Disableable;
/// Default number of visible text rows.
const DEFAULT_ROWS: u32 = 3;
/// Approximate line height in rems for calculating min-height.
const LINE_HEIGHT_REMS: f32 = 1.5;
/// Creates a new Textarea component.
///
/// # Example
///
/// ```ignore
/// let state = cx.new(|cx| InputState::new_multiline(cx));
///
/// textarea(&state, cx)
/// .placeholder("Enter your message...")
/// .rows(4)
/// .disabled(false)
/// ```
pub fn textarea(state: &Entity<InputState>, cx: &App) -> Textarea {
Textarea::new(state, cx)
}
/// A styled multi-line text input component.
///
/// Wraps the raw `text_area()` element with form-friendly styling including
/// borders, padding, background colors, and focus states.
#[derive(IntoElement)]
pub struct Textarea {
state: Entity<InputState>,
focus_handle: FocusHandle,
placeholder: Option<SharedString>,
rows: u32,
disabled: bool,
read_only: bool,
max_height: Option<Pixels>,
}
impl Textarea {
/// Creates a new Textarea wrapping the given InputState.
///
/// The InputState should be created with `InputState::new_multiline(cx)`.
pub fn new(state: &Entity<InputState>, cx: &App) -> Self {
Self {
state: state.clone(),
focus_handle: state.focus_handle(cx),
placeholder: None,
rows: DEFAULT_ROWS,
disabled: false,
read_only: false,
max_height: None,
}
}
/// Sets the placeholder text shown when the textarea is empty.
pub fn placeholder(mut self, placeholder: impl Into<SharedString>) -> Self {
self.placeholder = Some(placeholder.into());
self
}
/// Sets the number of visible text rows (affects min-height).
///
/// Defaults to 3 rows.
pub fn rows(mut self, rows: u32) -> Self {
self.rows = rows.max(1);
self
}
/// Sets a maximum height for the textarea.
///
/// When set, the textarea will scroll vertically if content exceeds this height.
pub fn max_height(mut self, height: impl Into<Pixels>) -> Self {
self.max_height = Some(height.into());
self
}
/// Sets the read-only state.
///
/// When read-only, the textarea is visually styled to indicate it cannot be edited,
/// but the user can still select and copy text.
///
/// Note: This currently only affects visual styling. Full read-only behavior
/// would require InputState-level support.
pub fn read_only(mut self, read_only: bool) -> Self {
self.read_only = read_only;
self
}
}
impl Disableable for Textarea {
fn is_disabled(&self) -> bool {
self.disabled
}
fn disabled(mut self, disabled: bool) -> Self {
self.disabled = disabled;
self
}
}
impl Focusable for Textarea {
fn focus_handle(&self, _cx: &App) -> FocusHandle {
self.focus_handle.clone()
}
}
impl RenderOnce for Textarea {
fn render(self, window: &mut Window, cx: &mut App) -> impl IntoElement {
let theme = cx.theme();
let is_focused = self.focus_handle.is_focused(window);
let disabled = self.disabled;
let read_only = self.read_only;
// Calculate min-height based on rows
let min_height = rems(self.rows as f32 * LINE_HEIGHT_REMS + 1.0); // +1.0 for padding
// Determine colors based on state
let bg_color = if disabled {
theme.surface_tertiary()
} else if read_only {
theme.surface_secondary()
} else {
theme.input_bg()
};
let border_color = if disabled {
theme.border_subtle()
} else if is_focused {
theme.input_border_focused()
} else {
theme.input_border()
};
let text_color = if disabled {
theme.fg_disabled()
} else {
theme.input_text()
};
// Build the inner text_area element
let mut inner = text_area(&self.state, cx)
.size_full()
.text_color(text_color);
if let Some(placeholder) = self.placeholder {
inner = inner.placeholder(placeholder);
}
// Build the container
div()
.id("textarea")
.min_h(min_height)
.when_some(self.max_height, |this, max_h| this.max_h(max_h))
.w_full()
.px(rems(0.75))
.py(rems(0.5))
.bg(bg_color)
.border_1()
.border_color(border_color)
.rounded(px(6.))
.overflow_hidden()
.text_sm()
.when(disabled, |this| this.cursor_not_allowed().opacity(0.65))
.when(!disabled && !read_only, |this| {
this.cursor_text().when(!is_focused, |this| {
this.hover(|style| style.border_color(theme.input_border_hover()))
})
})
.when(read_only && !disabled, |this| this.cursor_default())
.child(inner)
}
}