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use super::{text::EscapedText, Node}; use crate::{ attribute_value::{AttributeValue, IntoAttributeValue}, option_string_value::{IntoOptionStringValue, OptionStringValue}, string_value::IntoStringValue, }; use futures::{executor::block_on, stream::StreamExt}; use futures_signals::{ signal::{Signal, SignalExt}, signal_vec::{SignalVec, SignalVecExt}, }; use std::{borrow::Cow, future::Future}; use wasm_bindgen::prelude::*; use web_sys as dom; pub struct Element { tag: &'static str, kind: Option<HtmlElementKind>, attributes: Vec<Attribute>, classes: Vec<Class>, styles: Vec<Style>, children: Vec<Node>, inner_html: Option<Cow<'static, str>>, } pub enum Namespace { Html, Svg, MathMl, } #[derive(PartialEq)] pub enum HtmlElementKind { Void, Template, RawText, EscapableRawText, Foreign, Normal, } pub struct Attribute { name: Cow<'static, str>, value: AttributeValue, } pub struct Class { value: OptionStringValue, } pub struct Style { name: Cow<'static, str>, value: OptionStringValue, } impl Element { pub fn new(tag: &'static str, _namespace: Namespace, kind: Option<HtmlElementKind>) -> Element { Element { tag, kind, attributes: Vec::new(), classes: Vec::new(), styles: Vec::new(), children: Vec::new(), inner_html: None, } } pub fn future<F>(self, _f: impl FnOnce(&Element) -> F) -> Element where F: 'static + Future<Output = ()>, { self } pub fn attribute<T>(mut self, name: impl Into<Cow<'static, str>>, value: T) -> Element where T: IntoAttributeValue, { self.attributes.push(Attribute { name: name.into(), value: value.into_attribute_value(), }); self } pub fn attribute_signal<T, S>(mut self, name: impl Into<Cow<'static, str>>, value: S) -> Element where T: IntoAttributeValue, S: 'static + Unpin + Signal<Item = T>, { self.attributes.push(Attribute { name: name.into(), value: block_on(value.first().to_future()).into_attribute_value(), }); self } pub fn class<T>(mut self, value: T) -> Element where T: IntoOptionStringValue, { self.classes.push(Class { value: value.into_option_string_value(), }); self } pub fn class_signal<S, T>(mut self, value: S) -> Element where S: 'static + Unpin + Signal<Item = T>, T: IntoOptionStringValue, { self.classes.push(Class { value: block_on(value.first().to_future()).into_option_string_value(), }); self } pub fn style<T>(mut self, name: impl Into<Cow<'static, str>>, value: T) -> Element where T: IntoOptionStringValue, { self.styles.push(Style { name: name.into(), value: value.into_option_string_value(), }); self } pub fn style_signal<S, T>(mut self, name: impl Into<Cow<'static, str>>, value: S) -> Element where S: 'static + Unpin + Signal<Item = T>, T: IntoOptionStringValue, { self.styles.push(Style { name: name.into(), value: block_on(value.first().to_future()).into_option_string_value(), }); self } pub fn event( self, _name: impl Into<Cow<'static, str>>, _closure: impl 'static + FnMut(JsValue), ) -> Element { self } pub fn child<T>(mut self, child: T) -> Element where T: Into<Node>, { let child = child.into(); self.children.push(child); self } pub fn children<T, I>(mut self, children: I) -> Element where T: Into<Node>, I: IntoIterator<Item = T>, { for child in children.into_iter() { let child = child.into(); self.children.push(child); } self } pub fn child_signal<T, S>(mut self, signal: S) -> Element where T: Into<Node>, S: 'static + Unpin + Signal<Item = T>, { let child = block_on(signal.first().to_future()).into(); self.children.push(child); self } pub fn child_signal_vec<T, S>(mut self, signal_vec: S) -> Element where T: Into<Node>, S: 'static + Unpin + SignalVec<Item = T>, { let mut children = Vec::new(); block_on( signal_vec .map(|child| child.into()) .to_stream() .map(|diff| { diff.apply_to_vec(&mut children); }) .next(), ); self.children.append(&mut children); self } pub fn inner_html(mut self, value: impl IntoStringValue) -> Element { let html = value.into_string_value(); self.inner_html = Some(html.0); self.children.clear(); self } pub fn dom_element(&self) -> dom::Element { unimplemented!() } } impl std::fmt::Display for Element { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { write!(f, "<{}", self.tag)?; for attribute in self.attributes.iter() { match &attribute.value { AttributeValue::Bool(value) => { if value.unwrap_or(false) { write!(f, " {}", attribute.name)?; } } AttributeValue::String(value) => { if let Some(value) = value.as_ref() { write!(f, " {}=\"{}\"", attribute.name, EscapedText(value.as_ref()))?; } } } } if !self.classes.is_empty() { write!(f, " class=\"")?; let mut first = true; for class in self.classes.iter() { if let Some(value) = class.value.0.as_ref() { if first { first = false; } else { write!(f, " ")?; } write!(f, "{}", value)?; } } write!(f, "\"")?; } if !self.styles.is_empty() { write!(f, " style=\"")?; let mut first = true; for style in self.styles.iter() { if let Some(value) = style.value.0.as_ref() { if first { first = false; } else { write!(f, " ")?; } write!(f, "{}: {};", style.name, value)?; } } write!(f, "\"")?; } if self.kind == Some(HtmlElementKind::Void) { write!(f, " />")?; return Ok(()); } write!(f, ">")?; if let Some(inner_html) = &self.inner_html { write!(f, "{}", inner_html)?; } else { for child in self.children.iter() { write!(f, "{}", child)?; } } if self.kind != Some(HtmlElementKind::Void) { write!(f, "</{}>", self.tag)?; } Ok(()) } }