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37 lines
1.2 KiB
Rust
37 lines
1.2 KiB
Rust
// Copyright © SixtyFPS GmbH <info@slint-ui.com>
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// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
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/*!
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Since neon does not allow to have a persistent handle, use this hack.
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*/
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use neon::prelude::*;
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pub struct PersistentContext<'a>(Handle<'a, JsArray>);
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const KEY: &str = "$__persistent_context";
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/// Since neon does not allow to have a persistent handle, this allocates property in an array.
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/// This array is gonna be kept as a property somewhere.
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impl<'a> PersistentContext<'a> {
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pub fn new(cx: &mut impl Context<'a>) -> Self {
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PersistentContext(JsArray::new(cx, 0))
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}
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pub fn allocate(&self, cx: &mut impl Context<'a>, value: Handle<'a, JsValue>) -> u32 {
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let idx = self.0.len();
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self.0.set(cx, idx, value).unwrap();
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idx
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}
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pub fn get(&self, cx: &mut impl Context<'a>, idx: u32) -> JsResult<'a, JsValue> {
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self.0.get(cx, idx)
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}
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pub fn save_to_object(&self, cx: &mut impl Context<'a>, o: Handle<'a, JsObject>) {
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o.set(cx, KEY, self.0).unwrap();
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}
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pub fn from_object(cx: &mut impl Context<'a>, o: Handle<'a, JsObject>) -> NeonResult<Self> {
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Ok(PersistentContext(o.get(cx, KEY)?.downcast_or_throw(cx)?))
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}
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}
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