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43c7f57b0f
Take the opportunity to refactor a bit the way the global platform or context is accessed Fixes: #5871
95 lines
3.6 KiB
Rust
95 lines
3.6 KiB
Rust
// Copyright © SixtyFPS GmbH <info@slint.dev>
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// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0
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use crate::api::PlatformError;
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use crate::platform::{EventLoopProxy, Platform};
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#[cfg(all(not(feature = "std"), feature = "unsafe-single-threaded"))]
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use crate::thread_local;
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use crate::Property;
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#[cfg(not(feature = "std"))]
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use alloc::boxed::Box;
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use alloc::rc::Rc;
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thread_local! {
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pub(crate) static GLOBAL_CONTEXT : once_cell::unsync::OnceCell<SlintContext>
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= const { once_cell::unsync::OnceCell::new() }
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}
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pub(crate) struct SlintContextInner {
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platform: Box<dyn Platform>,
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pub(crate) window_count: core::cell::RefCell<isize>,
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/// This property is read by all translations, and marked dirty when the language change
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/// so that every translated string gets re-translated
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pub(crate) translations_dirty: core::pin::Pin<Box<Property<()>>>,
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pub(crate) window_shown_hook:
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core::cell::RefCell<Option<Box<dyn FnMut(&Rc<dyn crate::platform::WindowAdapter>)>>>,
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}
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/// This context is meant to hold the state and the backend.
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/// Currently it is not possible to have several platform at the same time in one process, but in the future it might be.
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/// See issue #4294
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#[derive(Clone)]
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pub struct SlintContext(pub(crate) Rc<SlintContextInner>);
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impl SlintContext {
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/// Create a new context with a given platform
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pub fn new(platform: Box<dyn Platform + 'static>) -> Self {
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Self(Rc::new(SlintContextInner {
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platform,
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window_count: 0.into(),
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translations_dirty: Box::pin(Property::new_named((), "SlintContext::translations")),
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window_shown_hook: Default::default(),
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}))
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}
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/// Return a reference to the platform abstraction
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pub fn platform(&self) -> &dyn Platform {
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&*self.0.platform
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}
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/// Return an event proxy
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// FIXME: Make EvenLoopProxy clonable, and maybe wrap in a struct
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pub fn event_loop_proxy(&self) -> Option<Box<dyn EventLoopProxy>> {
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self.0.platform.new_event_loop_proxy()
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}
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#[cfg(target_has_atomic = "ptr")]
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/// Context specific version of `slint::spawn_local`
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pub fn spawn_local<F: core::future::Future + 'static>(
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&self,
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fut: F,
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) -> Result<crate::future::JoinHandle<F::Output>, crate::api::EventLoopError> {
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crate::future::spawn_local_with_ctx(self, fut)
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}
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pub fn run_event_loop(&self) -> Result<(), PlatformError> {
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self.0.platform.run_event_loop()
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}
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}
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/// Internal function to access the context.
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/// The factory function is called if the platform abstraction is not yet
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/// initialized, and should be given by the platform_selector
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pub fn with_global_context<R>(
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factory: impl FnOnce() -> Result<Box<dyn Platform + 'static>, PlatformError>,
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f: impl FnOnce(&SlintContext) -> R,
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) -> Result<R, PlatformError> {
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GLOBAL_CONTEXT.with(|p| match p.get() {
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Some(ctx) => Ok(f(ctx)),
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None => {
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crate::platform::set_platform(factory()?).map_err(PlatformError::SetPlatformError)?;
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Ok(f(p.get().unwrap()))
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}
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})
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}
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/// Internal function to set a hook that's invoked whenever a slint::Window is shown. This
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/// is used by the system testing module. Returns a previously set hook, if any.
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pub fn set_window_shown_hook(
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hook: Option<Box<dyn FnMut(&Rc<dyn crate::platform::WindowAdapter>)>>,
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) -> Result<Option<Box<dyn FnMut(&Rc<dyn crate::platform::WindowAdapter>)>>, PlatformError> {
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GLOBAL_CONTEXT.with(|p| match p.get() {
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Some(ctx) => Ok(ctx.0.window_shown_hook.replace(hook)),
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None => Err(PlatformError::NoPlatform),
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})
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}
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