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event.rs
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event.rs
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// Copyright 2019-2021 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT
use super::InvokeContext;
use crate::{
api::ipc::CallbackFn, event::is_event_name_valid, sealed::ManagerBase, Manager, Runtime, Window,
};
use serde::{de::Deserializer, Deserialize};
use tauri_macros::CommandModule;
pub struct EventId(String);
impl<'de> Deserialize<'de> for EventId {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let event_id = String::deserialize(deserializer)?;
if is_event_name_valid(&event_id) {
Ok(EventId(event_id))
} else {
Err(serde::de::Error::custom(
"Event name must include only alphanumeric characters, `-`, `/`, `:` and `_`.",
))
}
}
}
/// The API descriptor.
#[derive(Deserialize, CommandModule)]
#[serde(tag = "cmd", rename_all = "camelCase")]
pub enum Cmd {
/// Listen to an event.
Listen { event: EventId, handler: CallbackFn },
/// Unlisten to an event.
#[serde(rename_all = "camelCase")]
Unlisten { event_id: u64 },
/// Emit an event to the webview associated with the given window.
/// If the window_label is omitted, the event will be triggered on all listeners.
#[serde(rename_all = "camelCase")]
Emit {
event: EventId,
window_label: Option<String>,
payload: Option<String>,
},
}
impl Cmd {
fn listen<R: Runtime>(
context: InvokeContext<R>,
event: EventId,
handler: CallbackFn,
) -> crate::Result<u64> {
let event_id = rand::random();
context.window.eval(&listen_js(
&context.window,
event.0.clone(),
event_id,
handler,
))?;
context.window.register_js_listener(event.0, event_id);
Ok(event_id)
}
fn unlisten<R: Runtime>(context: InvokeContext<R>, event_id: u64) -> crate::Result<()> {
context
.window
.eval(&unlisten_js(&context.window, event_id))?;
context.window.unregister_js_listener(event_id);
Ok(())
}
fn emit<R: Runtime>(
context: InvokeContext<R>,
event: EventId,
window_label: Option<String>,
payload: Option<String>,
) -> crate::Result<()> {
// dispatch the event to Rust listeners
context.window.trigger(&event.0, payload.clone());
if let Some(target) = window_label {
context.window.emit_to(&target, &event.0, payload)?;
} else {
context.window.emit_all(&event.0, payload)?;
}
Ok(())
}
}
pub fn unlisten_js<R: Runtime>(window: &Window<R>, event_id: u64) -> String {
format!(
"
for (var event in (window['{listeners}'] || {{}})) {{
var listeners = (window['{listeners}'] || {{}})[event]
if (listeners) {{
window['{listeners}'][event] = window['{listeners}'][event].filter(function (e) {{ return e.id !== {event_id} }})
}}
}}
",
listeners = window.manager().event_listeners_object_name(),
event_id = event_id,
)
}
pub fn listen_js<R: Runtime>(
window: &Window<R>,
event: String,
event_id: u64,
handler: CallbackFn,
) -> String {
format!(
"if (window['{listeners}'] === void 0) {{
window['{listeners}'] = Object.create(null)
}}
if (window['{listeners}']['{event}'] === void 0) {{
window['{listeners}']['{event}'] = []
}}
window['{listeners}']['{event}'].push({{
id: {event_id},
handler: window['{handler}']
}});
",
listeners = window.manager().event_listeners_object_name(),
event = event,
event_id = event_id,
handler = handler.0
)
}