dioxus_native/
event_handlers.rs

1use slotmap::{DefaultKey, Key, KeyData, SlotMap};
2use std::cell::RefCell;
3use std::rc::Rc;
4use winit::{event::WindowEvent, event_loop::ActiveEventLoop, window::WindowId};
5
6/// The unique identifier of a window event handler. This can be used to later remove the handler.
7#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
8pub struct WinitEventHandlerId(pub(crate) u64);
9
10impl WinitEventHandlerId {
11    /// Unregister this event handler from the window
12    pub fn remove(&self) {
13        let handlers: Rc<WindowEventHandlers> = dioxus_core::consume_context();
14        handlers.remove(*self);
15    }
16}
17
18struct WinitWindowEventHandlerInner {
19    window_id: WindowId,
20
21    #[allow(clippy::type_complexity)]
22    handler: Box<dyn FnMut(&WindowEvent, &dyn ActiveEventLoop) + 'static>,
23}
24
25#[derive(Default)]
26pub(crate) struct WindowEventHandlers {
27    handlers: RefCell<SlotMap<DefaultKey, WinitWindowEventHandlerInner>>,
28}
29
30impl WindowEventHandlers {
31    pub(crate) fn add(
32        &self,
33        window_id: WindowId,
34        handler: impl FnMut(&WindowEvent, &dyn ActiveEventLoop) + 'static,
35    ) -> WinitEventHandlerId {
36        let key = self
37            .handlers
38            .borrow_mut()
39            .insert(WinitWindowEventHandlerInner {
40                window_id,
41                handler: Box::new(handler),
42            });
43        WinitEventHandlerId(key.data().as_ffi())
44    }
45
46    pub(crate) fn remove(&self, id: WinitEventHandlerId) {
47        let key = DefaultKey::from(KeyData::from_ffi(id.0));
48        self.handlers.borrow_mut().remove(key);
49    }
50
51    pub fn apply_event(
52        &self,
53        window_id: WindowId,
54        event: &WindowEvent,
55        target: &dyn ActiveEventLoop,
56    ) {
57        for (_, handler) in self.handlers.borrow_mut().iter_mut() {
58            if handler.window_id != window_id {
59                continue;
60            }
61            (handler.handler)(event, target)
62        }
63    }
64}
dioxus_native/event_handlers.rs

dioxus_native/
event_handlers.rs
