virtual_node/event/
event_handlers.rs

1use crate::EventAttribFn;
2use std::cell::{Cell, RefCell};
3use std::fmt::{Debug, Formatter};
4use std::ops::Deref;
5use std::rc::Rc;
6
7/// Event handlers such as the closure in `onclick = |mouse_event| {}`.
8#[derive(Clone)]
9pub enum EventHandler {
10    /// A callback that does not contain any arguments.
11    NoArgs(Rc<RefCell<dyn FnMut()>>),
12    /// Handle mouse events such as `onclick` and `oninput`
13    MouseEvent(Rc<RefCell<dyn FnMut(MouseEvent)>>),
14    /// EventHandler's that we do not have a dedicated type for.
15    /// This is useful for custom events.
16    UnsupportedSignature(EventAttribFn),
17}
18
19/// A mouse event.
20///
21/// [MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent)
22#[derive(Clone)]
23pub struct MouseEvent {
24    event: web_sys::MouseEvent,
25    should_propagate: Rc<Cell<bool>>,
26}
27
28impl MouseEvent {
29    /// Create a new MouseEvent.
30    pub fn new(event: web_sys::MouseEvent) -> Self {
31        MouseEvent {
32            event,
33            should_propagate: Rc::new(Cell::new(true)),
34        }
35    }
36
37    /// Prevent the event from propagating.
38    pub fn stop_propagation(&self) {
39        self.should_propagate.set(false);
40        self.event.stop_propagation();
41    }
42
43    /// Whether or not the event should propagate.
44    pub fn should_propagate(&self) -> &Rc<Cell<bool>> {
45        &self.should_propagate
46    }
47}
48
49impl Deref for MouseEvent {
50    type Target = web_sys::MouseEvent;
51
52    fn deref(&self) -> &Self::Target {
53        &self.event
54    }
55}
56
57// Allows us to easily derive PartialEq for some of the types that contain events.
58// Those PartialEq implementations are used for testing.
59// Maybe we can put some of the event related PartialEq implementations
60// behind a #[cfg(any(test, feature = "__test-utils"))].
61impl PartialEq for EventHandler {
62    fn eq(&self, _other: &Self) -> bool {
63        true
64    }
65}
66
67impl Debug for EventHandler {
68    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
69        f.write_str("event handler")
70    }
71}
virtual_node/event/event_handlers.rs

virtual_node/event/
event_handlers.rs
