457 lines
18 KiB
Rust
457 lines
18 KiB
Rust
//! Implementation of a renderer for Dioxus on the web.
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//!
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//! Oustanding todos:
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//! - Removing event listeners (delegation)
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//! - Passive event listeners
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//! - no-op event listener patch for safari
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//! - tests to ensure dyn_into works for various event types.
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//! - Partial delegation?>
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use dioxus_core::{DomEdit, ElementId, SchedulerMsg, UserEvent};
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use dioxus_interpreter_js::Interpreter;
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use js_sys::Function;
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use std::{any::Any, rc::Rc, sync::Arc};
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use wasm_bindgen::{closure::Closure, JsCast};
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use web_sys::{Document, Element, Event, HtmlElement};
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use crate::WebConfig;
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pub struct WebsysDom {
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pub interpreter: Interpreter,
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pub(crate) root: Element,
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pub handler: Closure<dyn FnMut(&Event)>,
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}
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impl WebsysDom {
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pub fn new(cfg: WebConfig, sender_callback: Rc<dyn Fn(SchedulerMsg)>) -> Self {
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// eventually, we just want to let the interpreter do all the work of decoding events into our event type
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let callback: Box<dyn FnMut(&Event)> = Box::new(move |event: &web_sys::Event| {
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let mut target = event
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.target()
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.expect("missing target")
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.dyn_into::<Element>()
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.expect("not a valid element");
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let typ = event.type_();
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let decoded: anyhow::Result<UserEvent> = loop {
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match target.get_attribute("data-dioxus-id").map(|f| f.parse()) {
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Some(Ok(id)) => {
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break Ok(UserEvent {
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name: event_name_from_typ(&typ),
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data: virtual_event_from_websys_event(event.clone(), target.clone()),
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element: Some(ElementId(id)),
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scope_id: None,
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priority: dioxus_core::EventPriority::Medium,
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});
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}
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Some(Err(e)) => {
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break Err(e.into());
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}
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None => {
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// walk the tree upwards until we actually find an event target
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if let Some(parent) = target.parent_element() {
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target = parent;
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} else {
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break Ok(UserEvent {
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name: event_name_from_typ(&typ),
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data: virtual_event_from_websys_event(
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event.clone(),
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target.clone(),
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),
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element: None,
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scope_id: None,
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priority: dioxus_core::EventPriority::Low,
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});
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}
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}
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}
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};
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if let Ok(synthetic_event) = decoded {
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// Try to prevent default if the attribute is set
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if let Some(node) = target.dyn_ref::<HtmlElement>() {
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if let Some(name) = node.get_attribute("dioxus-prevent-default") {
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if name == synthetic_event.name
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|| name.trim_start_matches("on") == synthetic_event.name
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{
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log::trace!("Preventing default");
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event.prevent_default();
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}
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}
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}
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sender_callback.as_ref()(SchedulerMsg::Event(synthetic_event))
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}
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});
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// a match here in order to avoid some error during runtime browser test
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let document = load_document();
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let root = match document.get_element_by_id(&cfg.rootname) {
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Some(root) => root,
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None => document.create_element("body").ok().unwrap(),
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};
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Self {
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interpreter: Interpreter::new(root.clone()),
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handler: Closure::wrap(callback),
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root,
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}
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}
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pub fn apply_edits(&mut self, mut edits: Vec<DomEdit>) {
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for edit in edits.drain(..) {
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match edit {
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DomEdit::PushRoot { root } => self.interpreter.PushRoot(root),
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DomEdit::AppendChildren { many } => self.interpreter.AppendChildren(many),
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DomEdit::ReplaceWith { root, m } => self.interpreter.ReplaceWith(root, m),
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DomEdit::InsertAfter { root, n } => self.interpreter.InsertAfter(root, n),
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DomEdit::InsertBefore { root, n } => self.interpreter.InsertBefore(root, n),
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DomEdit::Remove { root } => self.interpreter.Remove(root),
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DomEdit::CreateElement { tag, root } => self.interpreter.CreateElement(tag, root),
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DomEdit::CreateElementNs { tag, root, ns } => {
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self.interpreter.CreateElementNs(tag, root, ns)
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}
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DomEdit::CreatePlaceholder { root } => self.interpreter.CreatePlaceholder(root),
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DomEdit::NewEventListener {
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event_name, root, ..
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} => {
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let handler: &Function = self.handler.as_ref().unchecked_ref();
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self.interpreter.NewEventListener(event_name, root, handler);
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}
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DomEdit::RemoveEventListener { root, event } => {
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self.interpreter.RemoveEventListener(root, event)
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}
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DomEdit::RemoveAttribute { root, name, ns } => {
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self.interpreter.RemoveAttribute(root, name, ns)
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}
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DomEdit::CreateTextNode { text, root } => {
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let text = serde_wasm_bindgen::to_value(text).unwrap();
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self.interpreter.CreateTextNode(text, root)
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}
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DomEdit::SetText { root, text } => {
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let text = serde_wasm_bindgen::to_value(text).unwrap();
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self.interpreter.SetText(root, text)
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}
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DomEdit::SetAttribute {
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root,
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field,
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value,
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ns,
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} => {
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let value = serde_wasm_bindgen::to_value(value).unwrap();
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self.interpreter.SetAttribute(root, field, value, ns)
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}
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}
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}
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}
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}
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pub struct DioxusWebsysEvent(web_sys::Event);
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// safety: currently the web is not multithreaded and our VirtualDom exists on the same thread
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#[allow(clippy::non_send_fields_in_send_ty)]
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unsafe impl Send for DioxusWebsysEvent {}
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unsafe impl Sync for DioxusWebsysEvent {}
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// todo: some of these events are being casted to the wrong event type.
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// We need tests that simulate clicks/etc and make sure every event type works.
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fn virtual_event_from_websys_event(
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event: web_sys::Event,
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target: Element,
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) -> Arc<dyn Any + Send + Sync> {
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use dioxus_html::on::*;
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use dioxus_html::KeyCode;
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match event.type_().as_str() {
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"copy" | "cut" | "paste" => Arc::new(ClipboardData {}),
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"compositionend" | "compositionstart" | "compositionupdate" => {
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let evt: &web_sys::CompositionEvent = event.dyn_ref().unwrap();
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Arc::new(CompositionData {
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data: evt.data().unwrap_or_default(),
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})
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}
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"keydown" | "keypress" | "keyup" => {
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let evt: &web_sys::KeyboardEvent = event.dyn_ref().unwrap();
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Arc::new(KeyboardData {
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alt_key: evt.alt_key(),
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char_code: evt.char_code(),
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key: evt.key(),
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key_code: KeyCode::from_raw_code(evt.key_code() as u8),
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ctrl_key: evt.ctrl_key(),
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locale: "not implemented".to_string(),
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location: evt.location() as usize,
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meta_key: evt.meta_key(),
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repeat: evt.repeat(),
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shift_key: evt.shift_key(),
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which: evt.which() as usize,
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})
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}
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"focus" | "blur" => Arc::new(FocusData {}),
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// todo: these handlers might get really slow if the input box gets large and allocation pressure is heavy
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// don't have a good solution with the serialized event problem
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"change" | "input" | "invalid" | "reset" | "submit" => {
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let value: String = (&target)
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.dyn_ref()
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.map(|input: &web_sys::HtmlInputElement| {
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// todo: special case more input types
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match input.type_().as_str() {
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"checkbox" => {
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match input.checked() {
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true => "true".to_string(),
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false => "false".to_string(),
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}
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},
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_ => {
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input.value()
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}
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}
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})
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.or_else(|| {
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target
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.dyn_ref()
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.map(|input: &web_sys::HtmlTextAreaElement| input.value())
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})
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// select elements are NOT input events - because - why woudn't they be??
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.or_else(|| {
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target
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.dyn_ref()
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.map(|input: &web_sys::HtmlSelectElement| input.value())
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})
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.or_else(|| {
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target
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.dyn_ref::<web_sys::HtmlElement>()
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.unwrap()
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.text_content()
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})
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.expect("only an InputElement or TextAreaElement or an element with contenteditable=true can have an oninput event listener");
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let mut values = std::collections::HashMap::new();
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// try to fill in form values
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if let Some(form) = target.dyn_ref::<web_sys::HtmlFormElement>() {
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let elements = form.elements();
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for x in 0..elements.length() {
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let element = elements.item(x).unwrap();
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if let Some(name) = element.get_attribute("name") {
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let value: String = (&element)
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.dyn_ref()
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.map(|input: &web_sys::HtmlInputElement| {
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match input.type_().as_str() {
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"checkbox" => {
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match input.checked() {
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true => "true".to_string(),
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false => "false".to_string(),
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}
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},
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_ => input.value()
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}
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})
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.or_else(|| target.dyn_ref().map(|input: &web_sys::HtmlTextAreaElement| input.value()))
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.or_else(|| target.dyn_ref().map(|input: &web_sys::HtmlSelectElement| input.value()))
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.or_else(|| target.dyn_ref::<web_sys::HtmlElement>().unwrap().text_content())
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.expect("only an InputElement or TextAreaElement or an element with contenteditable=true can have an oninput event listener");
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values.insert(name, value);
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}
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}
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}
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Arc::new(FormData { value, values })
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}
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"click" | "contextmenu" | "doubleclick" | "drag" | "dragend" | "dragenter" | "dragexit"
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| "dragleave" | "dragover" | "dragstart" | "drop" | "mousedown" | "mouseenter"
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| "mouseleave" | "mousemove" | "mouseout" | "mouseover" | "mouseup" => {
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let evt: &web_sys::MouseEvent = event.dyn_ref().unwrap();
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Arc::new(MouseData {
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alt_key: evt.alt_key(),
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button: evt.button(),
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buttons: evt.buttons(),
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client_x: evt.client_x(),
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client_y: evt.client_y(),
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ctrl_key: evt.ctrl_key(),
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meta_key: evt.meta_key(),
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screen_x: evt.screen_x(),
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screen_y: evt.screen_y(),
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shift_key: evt.shift_key(),
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page_x: evt.page_x(),
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page_y: evt.page_y(),
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})
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}
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"pointerdown" | "pointermove" | "pointerup" | "pointercancel" | "gotpointercapture"
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| "lostpointercapture" | "pointerenter" | "pointerleave" | "pointerover" | "pointerout" => {
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let evt: &web_sys::PointerEvent = event.dyn_ref().unwrap();
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Arc::new(PointerData {
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alt_key: evt.alt_key(),
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button: evt.button(),
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buttons: evt.buttons(),
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client_x: evt.client_x(),
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client_y: evt.client_y(),
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ctrl_key: evt.ctrl_key(),
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meta_key: evt.meta_key(),
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page_x: evt.page_x(),
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page_y: evt.page_y(),
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screen_x: evt.screen_x(),
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screen_y: evt.screen_y(),
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shift_key: evt.shift_key(),
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pointer_id: evt.pointer_id(),
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width: evt.width(),
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height: evt.height(),
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pressure: evt.pressure(),
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tangential_pressure: evt.tangential_pressure(),
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tilt_x: evt.tilt_x(),
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tilt_y: evt.tilt_y(),
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twist: evt.twist(),
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pointer_type: evt.pointer_type(),
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is_primary: evt.is_primary(),
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// get_modifier_state: evt.get_modifier_state(),
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})
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}
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"select" => Arc::new(SelectionData {}),
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"touchcancel" | "touchend" | "touchmove" | "touchstart" => {
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let evt: &web_sys::TouchEvent = event.dyn_ref().unwrap();
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Arc::new(TouchData {
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alt_key: evt.alt_key(),
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ctrl_key: evt.ctrl_key(),
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meta_key: evt.meta_key(),
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shift_key: evt.shift_key(),
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})
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}
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"scroll" => Arc::new(()),
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"wheel" => {
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let evt: &web_sys::WheelEvent = event.dyn_ref().unwrap();
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Arc::new(WheelData {
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delta_x: evt.delta_x(),
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delta_y: evt.delta_y(),
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delta_z: evt.delta_z(),
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delta_mode: evt.delta_mode(),
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})
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}
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"animationstart" | "animationend" | "animationiteration" => {
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let evt: &web_sys::AnimationEvent = event.dyn_ref().unwrap();
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Arc::new(AnimationData {
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elapsed_time: evt.elapsed_time(),
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animation_name: evt.animation_name(),
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pseudo_element: evt.pseudo_element(),
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})
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}
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"transitionend" => {
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let evt: &web_sys::TransitionEvent = event.dyn_ref().unwrap();
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Arc::new(TransitionData {
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elapsed_time: evt.elapsed_time(),
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property_name: evt.property_name(),
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pseudo_element: evt.pseudo_element(),
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})
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}
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"abort" | "canplay" | "canplaythrough" | "durationchange" | "emptied" | "encrypted"
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| "ended" | "error" | "loadeddata" | "loadedmetadata" | "loadstart" | "pause" | "play"
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| "playing" | "progress" | "ratechange" | "seeked" | "seeking" | "stalled" | "suspend"
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| "timeupdate" | "volumechange" | "waiting" => Arc::new(MediaData {}),
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"toggle" => Arc::new(ToggleData {}),
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_ => Arc::new(()),
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}
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}
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pub(crate) fn load_document() -> Document {
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web_sys::window()
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.expect("should have access to the Window")
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.document()
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.expect("should have access to the Document")
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}
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fn event_name_from_typ(typ: &str) -> &'static str {
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match typ {
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"copy" => "copy",
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"cut" => "cut",
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"paste" => "paste",
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"compositionend" => "compositionend",
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"compositionstart" => "compositionstart",
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"compositionupdate" => "compositionupdate",
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"keydown" => "keydown",
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"keypress" => "keypress",
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"keyup" => "keyup",
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"focus" => "focus",
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"blur" => "blur",
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"change" => "change",
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"input" => "input",
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"invalid" => "invalid",
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"reset" => "reset",
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"submit" => "submit",
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"click" => "click",
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"contextmenu" => "contextmenu",
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"doubleclick" => "doubleclick",
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"drag" => "drag",
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"dragend" => "dragend",
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"dragenter" => "dragenter",
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"dragexit" => "dragexit",
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"dragleave" => "dragleave",
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"dragover" => "dragover",
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"dragstart" => "dragstart",
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"drop" => "drop",
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"mousedown" => "mousedown",
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"mouseenter" => "mouseenter",
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"mouseleave" => "mouseleave",
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"mousemove" => "mousemove",
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"mouseout" => "mouseout",
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"mouseover" => "mouseover",
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"mouseup" => "mouseup",
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"pointerdown" => "pointerdown",
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"pointermove" => "pointermove",
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"pointerup" => "pointerup",
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"pointercancel" => "pointercancel",
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"gotpointercapture" => "gotpointercapture",
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"lostpointercapture" => "lostpointercapture",
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"pointerenter" => "pointerenter",
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"pointerleave" => "pointerleave",
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"pointerover" => "pointerover",
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"pointerout" => "pointerout",
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"select" => "select",
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"touchcancel" => "touchcancel",
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"touchend" => "touchend",
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"touchmove" => "touchmove",
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"touchstart" => "touchstart",
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"scroll" => "scroll",
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"wheel" => "wheel",
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"animationstart" => "animationstart",
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"animationend" => "animationend",
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"animationiteration" => "animationiteration",
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"transitionend" => "transitionend",
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"abort" => "abort",
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"canplay" => "canplay",
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"canplaythrough" => "canplaythrough",
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"durationchange" => "durationchange",
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"emptied" => "emptied",
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"encrypted" => "encrypted",
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"ended" => "ended",
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"error" => "error",
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"loadeddata" => "loadeddata",
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"loadedmetadata" => "loadedmetadata",
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"loadstart" => "loadstart",
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"pause" => "pause",
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"play" => "play",
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"playing" => "playing",
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"progress" => "progress",
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"ratechange" => "ratechange",
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"seeked" => "seeked",
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"seeking" => "seeking",
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"stalled" => "stalled",
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"suspend" => "suspend",
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"timeupdate" => "timeupdate",
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"volumechange" => "volumechange",
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"waiting" => "waiting",
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"toggle" => "toggle",
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_ => {
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panic!("unsupported event type")
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}
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}
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}
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