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//! Skeleton component for loading placeholders
//!
//! A placeholder that pulses while content loads. Its fill, radius and pulse
//! are `.cn-skeleton` rules (`@keyframes cn-skeleton-pulse`); restyle or slow
//! it with rules of your own:
//!
//! ```css
//! .my-skeleton { animation-duration: 3000ms; }
//! ```
//!
//! # Example
//!
//! ```ignore
//! use blinc_cn::prelude::*;
//!
//! // Simple skeleton line
//! cn::skeleton().h(20.0).w(200.0)
//!
//! // Avatar skeleton
//! cn::skeleton_circle(48.0)
//!
//! // Card skeleton
//! div().col().gap(8.0)
//! .child(cn::skeleton().h(200.0).w_full()) // Image
//! .child(cn::skeleton().h(24.0).w(150.0)) // Title
//! .child(cn::skeleton().h(16.0).w_full()) // Description line 1
//! .child(cn::skeleton().h(16.0).w(180.0)) // Description line 2
//! ```
use std::ops::{Deref, DerefMut};
use blinc_layout::div::{Div, ElementBuilder, ElementTypeId};
use blinc_layout::prelude::*;
/// Skeleton component for loading placeholders
pub struct Skeleton {
inner: Div,
}
impl Skeleton {
/// Create a new skeleton placeholder
pub fn new() -> Self {
Self {
inner: div().class("cn-skeleton"),
}
}
/// Create a circular skeleton (for avatars, icons)
pub fn circle(size: f32) -> Self {
Self {
inner: div()
.class("cn-skeleton")
.class("cn-skeleton--circle")
.w(size)
.h(size),
}
}
/// Set width
pub fn w(mut self, width: impl blinc_layout::binding::IntoReactive<f32>) -> Self {
self.inner = self.inner.w(width);
self
}
/// Set height
pub fn h(mut self, height: impl blinc_layout::binding::IntoReactive<f32>) -> Self {
self.inner = self.inner.h(height);
self
}
/// Set full width
pub fn w_full(mut self) -> Self {
self.inner = self.inner.w_full();
self
}
/// Set border radius
pub fn rounded(mut self, radius: impl blinc_layout::binding::IntoReactive<f32>) -> Self {
self.inner = self.inner.rounded(radius);
self
}
/// Add a CSS class for selector matching
pub fn class(mut self, name: impl AsRef<str>) -> Self {
self.inner = self.inner.class(name);
self
}
/// Set the element ID for CSS selector matching
pub fn id(mut self, id: &str) -> Self {
self.inner = self.inner.id(id);
self
}
}
impl Default for Skeleton {
fn default() -> Self {
Self::new()
}
}
impl Deref for Skeleton {
type Target = Div;
fn deref(&self) -> &Self::Target {
&self.inner
}
}
impl DerefMut for Skeleton {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.inner
}
}
impl ElementBuilder for Skeleton {
fn build(&self, tree: &mut blinc_layout::tree::LayoutTree) -> blinc_layout::tree::LayoutNodeId {
self.inner.build(tree)
}
fn render_props(&self) -> blinc_layout::element::RenderProps {
self.inner.render_props()
}
fn children_builders(&self) -> &[Box<dyn ElementBuilder>] {
self.inner.children_builders()
}
fn event_handlers(&self) -> Option<&blinc_layout::event_handler::EventHandlers> {
ElementBuilder::event_handlers(&self.inner)
}
fn layout_style(&self) -> Option<&taffy::Style> {
ElementBuilder::layout_style(&self.inner)
}
fn element_type_id(&self) -> ElementTypeId {
ElementBuilder::element_type_id(&self.inner)
}
fn element_classes(&self) -> &[std::sync::Arc<str>] {
self.inner.element_classes()
}
}
/// Create a skeleton placeholder
///
/// # Example
///
/// ```ignore
/// use blinc_cn::prelude::*;
///
/// // Text line skeleton
/// cn::skeleton().h(16.0).w(200.0)
///
/// // Avatar skeleton
/// cn::skeleton_circle(40.0)
/// ```
pub fn skeleton() -> Skeleton {
Skeleton::new()
}
/// Create a circular skeleton
///
/// # Example
///
/// ```ignore
/// cn::skeleton_circle(48.0) // 48px avatar placeholder
/// ```
pub fn skeleton_circle(size: f32) -> Skeleton {
Skeleton::circle(size)
}
#[cfg(test)]
mod tests {
use super::*;
fn init_theme() {
let _ = blinc_theme::ThemeState::try_get().unwrap_or_else(|| {
blinc_theme::ThemeState::init_default();
blinc_theme::ThemeState::get()
});
}
#[test]
fn test_skeleton_default() {
init_theme();
let _ = skeleton();
}
#[test]
fn test_skeleton_sized() {
init_theme();
let _ = skeleton().h(20.0).w(200.0);
}
#[test]
fn test_skeleton_circle() {
init_theme();
let _ = skeleton_circle(48.0);
}
}