virtual_node/event/
web.rs

1use crate::event::virtual_events::ElementEventsId;
2use crate::event::{
3    EventHandler, EventName, MouseEventWebSys, VirtualEvents, ELEMENT_EVENTS_ID_PROP,
4};
5use js_sys::Reflect;
6use std::fmt;
7use std::fmt::Formatter;
8use std::rc::Rc;
9use wasm_bindgen::closure::Closure;
10use wasm_bindgen::JsCast;
11
12/// A type-erased [`js_sys::Closure`]. Stored as a trait object to enable any number of arguments.
13pub(crate) type EventWrapper = std::rc::Rc<dyn AsRef<wasm_bindgen::JsValue>>;
14
15/// A handler for an event, such the closure in `onmyevent = || {}`.
16#[derive(Clone)]
17pub struct EventAttribFn(pub EventWrapper);
18
19impl EventAttribFn {
20    /// Create a new [`EventAttribFn`].
21    pub fn new(callback: EventWrapper) -> Self {
22        Self(callback)
23    }
24}
25
26/// Attaches an event handler directly onto a DOM element.
27///
28/// See [`VirtualEvents`] and [`EventName::is_delegated`] for documentation regarding event delegation.
29pub fn insert_non_delegated_event(
30    element: &web_sys::Element,
31    onevent: &EventName,
32    callback: &EventHandler<web_sys::Window>,
33    events_id: ElementEventsId,
34    events: &VirtualEvents<web_sys::Window>,
35) {
36    let events_clone = events.clone();
37
38    let event_name = onevent.without_on_prefix();
39
40    let on_event = onevent.with_on_prefix().to_string();
41    let on_event_clone = on_event.clone();
42
43    let callback_wrapper = move |event: web_sys::Event| {
44        let this_elem = event.current_target().unwrap();
45
46        let events_id = Reflect::get(&this_elem, &ELEMENT_EVENTS_ID_PROP.into()).unwrap();
47        let events_id = events_id.as_string();
48        let events_id = events_id.unwrap();
49
50        let events_id =
51            events_id.trim_start_matches(&events_clone.events_id_props_prefix().to_string());
52        let events_id: u32 = events_id.parse().unwrap();
53
54        let event_name = EventName::new(on_event_clone.clone().into());
55        let cb = events_clone
56            .get_event_handler(&ElementEventsId::new(events_id), &event_name)
57            .unwrap();
58
59        match cb {
60            EventHandler::NoArgs(no_args) => (no_args.borrow_mut())(),
61            EventHandler::MouseEvent(mouse) => {
62                (mouse.borrow_mut())(MouseEventWebSys::new(event.dyn_into().unwrap()));
63            }
64            EventHandler::Custom(cb) => {
65                use wasm_bindgen::JsCast;
66
67                let context = wasm_bindgen::JsValue::NULL;
68                let callback: &js_sys::Function = cb.as_ref().as_ref().unchecked_ref();
69                callback.call1(&context, &event).unwrap();
70            }
71        };
72    };
73
74    let callback_wrapper = Box::new(callback_wrapper) as Box<dyn FnMut(_) -> ()>;
75    let callback_wrapper = Closure::wrap(callback_wrapper);
76
77    let current_elem: &web_sys::EventTarget = element.dyn_ref().unwrap();
78    current_elem
79        .add_event_listener_with_callback(
80            event_name,
81            callback_wrapper.as_ref().as_ref().unchecked_ref(),
82        )
83        .unwrap();
84
85    let event_wrapper = Rc::new(callback_wrapper);
86    events.insert_event(
87        events_id,
88        onevent.clone(),
89        callback.clone(),
90        Some(event_wrapper),
91    );
92}
93
94// Allows us to easily derive PartialEq for some of the types that contain events.
95// Those PartialEq implementations are used for testing.
96// Maybe we can put some of the event related PartialEq implementations
97// behind a #[cfg(any(test, feature = "__test-utils"))].
98impl PartialEq for EventAttribFn {
99    fn eq(&self, _other: &Self) -> bool {
100        true
101    }
102}
103
104impl fmt::Debug for EventAttribFn {
105    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
106        write!(f, "event_handler()")
107    }
108}
109
110impl From<EventWrapper> for EventAttribFn {
111    fn from(inner: EventWrapper) -> Self {
112        EventAttribFn(inner)
113    }
114}
virtual_node/event/web.rs

virtual_node/event/
web.rs
