From dc38487fd4587a61bb64008d703958d6065d1a1d Mon Sep 17 00:00:00 2001 From: Robert Bragg Date: Tue, 10 May 2022 01:33:57 +0100 Subject: [PATCH] Android: rework backend to use android_activity crate This updates the Android backend to use the android_activity crate instead of ndk-glue. This solves a few issues: 1. The backend is agnostic of the application's choice of Activity base class 2. Winit is no longer responsible for handling any Java synchronization details, since these are encapsulated by the design of android_activity 3. The backend no longer depends on global / static getters for state such as the native_window() which puts it in a better position to support running multiple activities within a single Android process. 4. Redraw requests are flagged, not queued, in a way that avoids taking priority over user events (resolves #2299) Addresses: PR https://github.com/rust-windowing/winit/pull/1892 Addresses: PR https://github.com/rust-windowing/winit/pull/2307 Addresses: PR https://github.com/rust-windowing/winit/pull/2343 Addresses: #2293 Resolves: #2299 --- CHANGELOG.md | 1 + Cargo.toml | 2 +- README.md | 71 ++- src/event_loop.rs | 10 + src/platform/android.rs | 24 +- src/platform_impl/android/mod.rs | 995 +++++++++++++++++++------------ 6 files changed, 687 insertions(+), 416 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index 9d6990eac74..b60fcdc0477 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -21,6 +21,7 @@ And please only add new entries to the top of this list, right below the `# Unre - On Wayland, `wayland-csd-adwaita` now uses `ab_glyph` instead of `crossfont` to render the title for decorations. - On Wayland, a new `wayland-csd-adwaita-crossfont` feature was added to use `crossfont` instead of `ab_glyph` for decorations. - On Wayland, if not otherwise specified use upstream automatic CSD theme selection. +- **Breaking:** On Android, switched to using [`android-activity`](https://github.com/rib/android-activity) crate as a glue layer instead of [`ndk-glue](https://github.com/rust-windowing/android-ndk-rs/tree/master/ndk-glue). See [README.md#Android](https://github.com/rust-windowing/winit#Android) for more details. ([#2444](https://github.com/rust-windowing/winit/pull/2444)) # 0.27.3 diff --git a/Cargo.toml b/Cargo.toml index a691f59a2e0..054c2aae672 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -59,7 +59,7 @@ simple_logger = { version = "2.1.0", default_features = false } [target.'cfg(target_os = "android")'.dependencies] # Coordinate the next winit release with android-ndk-rs: https://github.com/rust-windowing/winit/issues/1995 ndk = "0.7.0" -ndk-glue = "0.7.0" +android-activity = "0.3" [target.'cfg(any(target_os = "ios", target_os = "macos"))'.dependencies] objc2 = "=0.3.0-beta.3" diff --git a/README.md b/README.md index d9d09f6cad7..f74a8dfeff4 100644 --- a/README.md +++ b/README.md @@ -99,36 +99,77 @@ book]. #### Android -This library makes use of the [ndk-rs](https://github.com/rust-windowing/android-ndk-rs) crates, refer to that repo for more documentation. +The Android backend builds on (and exposes types from) the [`ndk`](https://docs.rs/ndk/0.7.0/ndk/) crate. -The `ndk-glue` version needs to match the version used by `winit`. Otherwise, the application will not start correctly as `ndk-glue`'s internal `NativeActivity` static is not the same due to version mismatch. +Native Android applications need some form of "glue" crate that is responsible for defining the main entry point for your Rust application as well as tracking various life-cycle events and synchronizing with the main JVM thread. -`winit` compatibility table with `ndk-glue`: +Winit uses the [android-activity](https://github.com/rib/android-activity) as a glue crate (prior to `0.28` it used [ndk-glue](https://github.com/rust-windowing/android-ndk-rs/tree/master/ndk-glue). -| winit | ndk-glue | -| :---: | :------------------: | -| 0.24 | `ndk-glue = "0.2.0"` | -| 0.25 | `ndk-glue = "0.3.0"` | -| 0.26 | `ndk-glue = "0.5.0"` | -| 0.27 | `ndk-glue = "0.7.0"` | +The version of the glue crate that your application depends on _must_ match the version that Winit depends on because the glue crate is responsible for your application's main entrypoint. If Cargo resolves multiple versions they will clash. + +`winit` glue compatibility table: + +| winit | ndk-glue | +| :---: | :--------------------------: | +| 0.28 | `android-activity = "0.3.0"` | +| 0.27 | `ndk-glue = "0.7.0"` | +| 0.26 | `ndk-glue = "0.5.0"` | +| 0.25 | `ndk-glue = "0.3.0"` | +| 0.24 | `ndk-glue = "0.2.0"` | + +_Note: There is unfortunately no ergonomic way to configure Cargo so that it understands that the glue crate is special on Android and to give a clear error if multiple versions are resolved. With `ndk-glue` you will get a runtime failure caused by clashing, global static variables. With `android-activity` you will see a compile-time error due to missing feature flags._ Running on an Android device needs a dynamic system library, add this to Cargo.toml: ```toml [[example]] -name = "request_redraw_threaded" +name = "main" crate-type = ["cdylib"] ``` -And add this to the example file to add the native activity glue: +All Android applications are based on an `Activity` subclass and the `android-activity` crate is designed to support different choices for this base class. You application must specify the base class it needs via a feature flag: + +| Base Class | Feature Flag | Notes | +| :--------------: | :---------------: | :-----: | +| `NativeActivity` | `native-activity` | Built-in to Android - making it possible to build some tests/demos without needing to compile any JVM code. Can give a false sense of convenience because it's often not really possible to avoid needing a build system that can compile some JVM code, to at least subclass `NativeActivity` | +| [`GameActivity`] | `game-activity` | Derives from [`AndroidAppCompat`] which is a defacto standard `Activity` base class that helps support a wider range of Android versions. Will offer integration with [`GameTextInput`] library for soft keyboard support. Requires a build system that can compile Java and fetch Android dependencies from a Maven repository (with [Gradle] being the defacto standard build system for Android applications) | + +[`GameActivity`]: https://developer.android.com/games/agdk/game-activity +[`GameTextInput`]: https://developer.android.com/games/agdk/add-support-for-text-input +[`AndroidAppCompat`]: https://developer.android.com/reference/androidx/appcompat/app/AppCompatActivity +[Gradle]: https://developer.android.com/studio/build + +For example, add this to Cargo.toml: +```toml +[target.'cfg(target_os = "android")'.dependencies] +android_logger = "0.11.0" +android-activity = { version = "0.3", features = [ "game-activity" ] } +``` + +And, for example, define an entry point for your library like this: ```rust -#[cfg_attr(target_os = "android", ndk_glue::main(backtrace = "on"))] -fn main() { - ... +#[cfg(target_os = "android")] +#[no_mangle] +fn android_main(app: AndroidApp) { + use winit::platform::android::EventLoopBuilderExtAndroid; + + android_logger::init_once(android_logger::Config::default().with_min_level(log::Level::Trace)); + + let event_loop = EventLoopBuilder::with_user_event() + .with_android_app(app) + .build(); + _main(event_loop); } ``` -And run the application with `cargo apk run --example request_redraw_threaded` +For more details, refer to these `android-activity` [example applications](https://github.com/rib/android-activity/tree/main/examples). + +##### Converting from `ndk-glue` to `android-activity` + +If your application is currently based on `NativeActivity` via the `ndk-glue` crate and building with `cargo apk` then the minimal changes would be: +1. Remove `ndk-glue` from your `Cargo.toml` and add dependency on `android-activity` that specifies the `"native-activity"` feature like: `android-activity = { version = "0.3", features = [ "native-activity" ] }` +2. Add an `android_main` entrypoint (as above), instead of using the '`[ndk_glue::main]` proc macro from `ndk-macros` (optionally add a dependency on `android_logger` and initialize logging as above). +3. Pass a clone of the `AndroidApp` that your application receives to Winit when building your event loop (as shown above). #### MacOS diff --git a/src/event_loop.rs b/src/event_loop.rs index f376ceab79e..b4bfc3f0db7 100644 --- a/src/event_loop.rs +++ b/src/event_loop.rs @@ -97,8 +97,18 @@ impl EventLoopBuilder { /// `WINIT_UNIX_BACKEND`. Legal values are `x11` and `wayland`. /// If it is not set, winit will try to connect to a Wayland connection, and if that fails, /// will fall back on X11. If this variable is set with any other value, winit will panic. + /// - **Android:** Must be configured with an `AndroidApp` from `android_main()` by calling + /// [`.with_android_app(app)`] before calling `.build()`. /// /// [`platform`]: crate::platform + #[cfg_attr( + target_os = "android", + doc = "[`.with_android_app(app)`]: crate::platform::android::EventLoopBuilderExtAndroid::with_android_app" + )] + #[cfg_attr( + not(target_os = "android"), + doc = "[`.with_android_app(app)`]: #only-available-on-android" + )] #[inline] pub fn build(&mut self) -> EventLoop { static EVENT_LOOP_CREATED: OnceCell<()> = OnceCell::new(); diff --git a/src/platform/android.rs b/src/platform/android.rs index aae8c826163..671da618dac 100644 --- a/src/platform/android.rs +++ b/src/platform/android.rs @@ -1,9 +1,9 @@ use crate::{ - event_loop::{EventLoop, EventLoopWindowTarget}, + event_loop::{EventLoop, EventLoopBuilder, EventLoopWindowTarget}, window::{Window, WindowBuilder}, }; -use ndk::configuration::Configuration; -use ndk_glue::Rect; + +use android_activity::{AndroidApp, ConfigurationRef, Rect}; /// Additional methods on [`EventLoop`] that are specific to Android. pub trait EventLoopExtAndroid {} @@ -17,7 +17,7 @@ pub trait EventLoopWindowTargetExtAndroid {} pub trait WindowExtAndroid { fn content_rect(&self) -> Rect; - fn config(&self) -> Configuration; + fn config(&self) -> ConfigurationRef; } impl WindowExtAndroid for Window { @@ -25,7 +25,7 @@ impl WindowExtAndroid for Window { self.window.content_rect() } - fn config(&self) -> Configuration { + fn config(&self) -> ConfigurationRef { self.window.config() } } @@ -36,3 +36,17 @@ impl EventLoopWindowTargetExtAndroid for EventLoopWindowTarget {} pub trait WindowBuilderExtAndroid {} impl WindowBuilderExtAndroid for WindowBuilder {} + +pub trait EventLoopBuilderExtAndroid { + /// Associates the `AndroidApp` that was passed to `android_main()` with the event loop + /// + /// This must be called on Android since the `AndroidApp` is not global state. + fn with_android_app(&mut self, app: AndroidApp) -> &mut Self; +} + +impl EventLoopBuilderExtAndroid for EventLoopBuilder { + fn with_android_app(&mut self, app: AndroidApp) -> &mut Self { + self.platform_specific.android_app = Some(app); + self + } +} diff --git a/src/platform_impl/android/mod.rs b/src/platform_impl/android/mod.rs index 3ed8dfeef7d..f640819acfe 100644 --- a/src/platform_impl/android/mod.rs +++ b/src/platform_impl/android/mod.rs @@ -2,18 +2,16 @@ use std::{ collections::VecDeque, - sync::{mpsc, RwLock}, + hash::Hash, + sync::{ + atomic::{AtomicBool, Ordering}, + mpsc, Arc, + }, time::{Duration, Instant}, }; -use ndk::{ - configuration::Configuration, - event::{InputEvent, KeyAction, Keycode, MotionAction}, - looper::{ForeignLooper, Poll, ThreadLooper}, - native_window::NativeWindow, -}; -use ndk_glue::{Event, LockReadGuard, Rect}; -use once_cell::sync::Lazy; +use android_activity::input::{InputEvent, KeyAction, Keycode, MotionAction}; +use android_activity::{AndroidApp, AndroidAppWaker, ConfigurationRef, MainEvent, Rect}; use raw_window_handle::{ AndroidDisplayHandle, HasRawWindowHandle, RawDisplayHandle, RawWindowHandle, }; @@ -21,37 +19,12 @@ use raw_window_handle::{ use crate::{ dpi::{PhysicalPosition, PhysicalSize, Position, Size}, error, - event::{self, VirtualKeyCode}, - event_loop::{self, ControlFlow}, + event::{self, StartCause, VirtualKeyCode}, + event_loop::{self, ControlFlow, EventLoopWindowTarget as RootELW}, monitor, window::{self, CursorGrabMode}, }; -static CONFIG: Lazy> = Lazy::new(|| { - RwLock::new(Configuration::from_asset_manager( - #[allow(deprecated)] // TODO: rust-windowing/winit#2196 - &ndk_glue::native_activity().asset_manager(), - )) -}); -// If this is `Some()` a `Poll::Wake` is considered an `EventSource::Internal` with the event -// contained in the `Option`. The event is moved outside of the `Option` replacing it with a -// `None`. -// -// This allows us to inject event into the event loop without going through `ndk-glue` and -// calling unsafe function that should only be called by Android. -static INTERNAL_EVENT: Lazy>> = Lazy::new(|| RwLock::new(None)); - -enum InternalEvent { - RedrawRequested, -} - -enum EventSource { - Callback, - InputQueue, - User, - Internal(InternalEvent), -} - fn ndk_keycode_to_virtualkeycode(keycode: Keycode) -> Option { match keycode { Keycode::A => Some(VirtualKeyCode::A), @@ -216,383 +189,593 @@ fn ndk_keycode_to_virtualkeycode(keycode: Keycode) -> Option Option { - match poll { - Poll::Event { ident, .. } => match ident { - ndk_glue::NDK_GLUE_LOOPER_EVENT_PIPE_IDENT => Some(EventSource::Callback), - ndk_glue::NDK_GLUE_LOOPER_INPUT_QUEUE_IDENT => Some(EventSource::InputQueue), - _ => unreachable!(), - }, - Poll::Timeout => None, - Poll::Wake => Some( - INTERNAL_EVENT - .write() - .unwrap() - .take() - .map_or(EventSource::User, EventSource::Internal), - ), - Poll::Callback => unreachable!(), +struct PeekableReceiver { + recv: mpsc::Receiver, + first: Option, +} + +impl PeekableReceiver { + pub fn from_recv(recv: mpsc::Receiver) -> Self { + Self { recv, first: None } + } + pub fn has_incoming(&mut self) -> bool { + if self.first.is_some() { + return true; + } + match self.recv.try_recv() { + Ok(v) => { + self.first = Some(v); + true + } + Err(mpsc::TryRecvError::Empty) => false, + Err(mpsc::TryRecvError::Disconnected) => { + warn!("Channel was disconnected when checking incoming"); + false + } + } + } + pub fn try_recv(&mut self) -> Result { + if let Some(first) = self.first.take() { + return Ok(first); + } + self.recv.try_recv() + } +} + +#[derive(Clone)] +struct SharedFlagSetter { + flag: Arc, +} +impl SharedFlagSetter { + pub fn set(&self) -> bool { + self.flag + .compare_exchange(false, true, Ordering::AcqRel, Ordering::Relaxed) + .is_ok() + } +} + +struct SharedFlag { + flag: Arc, +} + +// Used for queuing redraws from arbitrary threads. We don't care how many +// times a redraw is requested (so don't actually need to queue any data, +// we just need to know at the start of a main loop iteration if a redraw +// was queued and be able to read and clear the state atomically) +impl SharedFlag { + pub fn new() -> Self { + Self { + flag: Arc::new(AtomicBool::new(false)), + } + } + pub fn setter(&self) -> SharedFlagSetter { + SharedFlagSetter { + flag: self.flag.clone(), + } + } + pub fn get_and_reset(&self) -> bool { + self.flag.swap(false, std::sync::atomic::Ordering::AcqRel) + } +} + +#[derive(Clone)] +pub struct RedrawRequester { + flag: SharedFlagSetter, + waker: AndroidAppWaker, +} + +impl RedrawRequester { + fn new(flag: &SharedFlag, waker: AndroidAppWaker) -> Self { + RedrawRequester { + flag: flag.setter(), + waker, + } + } + pub fn request_redraw(&self) { + if self.flag.set() { + // Only explicitly try to wake up the main loop when the flag + // value changes + self.waker.wake(); + } } } pub struct EventLoop { + android_app: AndroidApp, window_target: event_loop::EventLoopWindowTarget, + redraw_flag: SharedFlag, user_events_sender: mpsc::Sender, - user_events_receiver: mpsc::Receiver, - first_event: Option, - start_cause: event::StartCause, - looper: ThreadLooper, + user_events_receiver: PeekableReceiver, //must wake looper whenever something gets sent running: bool, - window_lock: Option>, } -#[derive(Default, Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub(crate) struct PlatformSpecificEventLoopAttributes {} +#[derive(Default, Debug, Clone, PartialEq)] +pub(crate) struct PlatformSpecificEventLoopAttributes { + pub(crate) android_app: Option, +} -macro_rules! call_event_handler { - ( $event_handler:expr, $window_target:expr, $cf:expr, $event:expr ) => {{ - if let ControlFlow::ExitWithCode(code) = $cf { - $event_handler($event, $window_target, &mut ControlFlow::ExitWithCode(code)); - } else { - $event_handler($event, $window_target, &mut $cf); - } - }}; +fn sticky_exit_callback( + evt: event::Event<'_, T>, + target: &RootELW, + control_flow: &mut ControlFlow, + callback: &mut F, +) where + F: FnMut(event::Event<'_, T>, &RootELW, &mut ControlFlow), +{ + // make ControlFlow::ExitWithCode sticky by providing a dummy + // control flow reference if it is already ExitWithCode. + if let ControlFlow::ExitWithCode(code) = *control_flow { + callback(evt, target, &mut ControlFlow::ExitWithCode(code)) + } else { + callback(evt, target, control_flow) + } +} + +struct IterationResult { + deadline: Option, + timeout: Option, + wait_start: Instant, } impl EventLoop { - pub(crate) fn new(_: &PlatformSpecificEventLoopAttributes) -> Self { + pub(crate) fn new(attributes: &PlatformSpecificEventLoopAttributes) -> Self { let (user_events_sender, user_events_receiver) = mpsc::channel(); + + let android_app = attributes.android_app.as_ref().expect("An `AndroidApp` as passed to android_main() is required to create an `EventLoop` on Android"); + let redraw_flag = SharedFlag::new(); + Self { + android_app: android_app.clone(), window_target: event_loop::EventLoopWindowTarget { p: EventLoopWindowTarget { + app: android_app.clone(), + redraw_requester: RedrawRequester::new( + &redraw_flag, + android_app.create_waker(), + ), _marker: std::marker::PhantomData, }, _marker: std::marker::PhantomData, }, + redraw_flag, user_events_sender, - user_events_receiver, - first_event: None, - start_cause: event::StartCause::Init, - looper: ThreadLooper::for_thread().unwrap(), + user_events_receiver: PeekableReceiver::from_recv(user_events_receiver), running: false, - window_lock: None, } } - pub fn run(mut self, event_handler: F) -> ! + fn single_iteration<'a, F>( + &mut self, + //this: &mut EventLoop, + control_flow: &mut ControlFlow, + main_event: Option>, + pending_redraw: &mut bool, + cause: &mut StartCause, + callback: &mut F, + ) -> IterationResult where - F: 'static - + FnMut(event::Event<'_, T>, &event_loop::EventLoopWindowTarget, &mut ControlFlow), - { - let exit_code = self.run_return(event_handler); - ::std::process::exit(exit_code); - } - - pub fn run_return(&mut self, mut event_handler: F) -> i32 - where - F: FnMut(event::Event<'_, T>, &event_loop::EventLoopWindowTarget, &mut ControlFlow), + F: FnMut(event::Event<'_, T>, &RootELW, &mut ControlFlow), { - let mut control_flow = ControlFlow::default(); + trace!("Mainloop iteration"); + + sticky_exit_callback( + event::Event::NewEvents(*cause), + self.window_target(), + control_flow, + callback, + ); + + //let mut redraw = false; + let mut resized = false; + + if let Some(event) = main_event { + trace!("Handling main event {:?}", event); + + match event { + MainEvent::InitWindow { .. } => { + sticky_exit_callback( + event::Event::Resumed, + self.window_target(), + control_flow, + callback, + ); + } + MainEvent::TerminateWindow { .. } => { + sticky_exit_callback( + event::Event::Suspended, + self.window_target(), + control_flow, + callback, + ); + } + MainEvent::WindowResized { .. } => resized = true, + MainEvent::RedrawNeeded { .. } => *pending_redraw = true, + //{ + // self.redraw_flag.setter().set(); + //}, + MainEvent::ContentRectChanged { .. } => { + warn!("TODO: find a way to notify application of content rect change"); + } + MainEvent::GainedFocus => { + sticky_exit_callback( + event::Event::WindowEvent { + window_id: window::WindowId(WindowId), + event: event::WindowEvent::Focused(true), + }, + self.window_target(), + control_flow, + callback, + ); + } + MainEvent::LostFocus => { + sticky_exit_callback( + event::Event::WindowEvent { + window_id: window::WindowId(WindowId), + event: event::WindowEvent::Focused(false), + }, + self.window_target(), + control_flow, + callback, + ); + } + MainEvent::ConfigChanged { .. } => { + let monitor = MonitorHandle::new(self.android_app.clone()); + let old_scale_factor = monitor.scale_factor(); + let scale_factor = monitor.scale_factor(); + if (scale_factor - old_scale_factor).abs() < f64::EPSILON { + let mut size = MonitorHandle::new(self.android_app.clone()).size(); + let event = event::Event::WindowEvent { + window_id: window::WindowId(WindowId), + event: event::WindowEvent::ScaleFactorChanged { + new_inner_size: &mut size, + scale_factor, + }, + }; + sticky_exit_callback(event, self.window_target(), control_flow, callback); + } + } + MainEvent::LowMemory => { + // XXX: how to forward this state to applications? + // It seems like ideally winit should support lifecycle and + // low-memory events, especially for mobile platforms. + warn!("TODO: handle Android LowMemory notification"); + } + MainEvent::Start => { + // XXX: how to forward this state to applications? + warn!("TODO: forward onStart notification to application"); + } + MainEvent::Resume { .. } => { + debug!("App Resumed - is running"); + self.running = true; + } + MainEvent::SaveState { .. } => { + // XXX: how to forward this state to applications? + // XXX: also how do we expose state restoration to apps? + warn!("TODO: forward saveState notification to application"); + } + MainEvent::Pause => { + debug!("App Paused - stopped running"); + self.running = false; + } + MainEvent::Stop => { + // XXX: how to forward this state to applications? + warn!("TODO: forward onStop notification to application"); + } + MainEvent::Destroy => { + // XXX: maybe exit mainloop to drop things before being + // killed by the OS? + warn!("TODO: forward onDestroy notification to application"); + } + MainEvent::InsetsChanged { .. } => { + // XXX: how to forward this state to applications? + warn!("TODO: handle Android InsetsChanged notification"); + } + unknown => { + trace!("Unknown MainEvent {unknown:?} (ignored)"); + } + } + } else { + trace!("No main event to handle"); + } - 'event_loop: loop { - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event::Event::NewEvents(self.start_cause) - ); - - let mut redraw = false; - let mut resized = false; - - match self.first_event.take() { - Some(EventSource::Callback) => match ndk_glue::poll_events().unwrap() { - Event::WindowCreated => { - // Acquire a lock on the window to prevent Android from destroying - // it until we've notified and waited for the user in Event::Suspended. - // WARNING: ndk-glue is inherently racy (https://github.com/rust-windowing/winit/issues/2293) - // and may have already received onNativeWindowDestroyed while this thread hasn't yet processed - // the event, and would see a `None` lock+window in that case. - if let Some(next_window_lock) = ndk_glue::native_window() { - assert!( - self.window_lock.replace(next_window_lock).is_none(), - "Received `Event::WindowCreated` while we were already holding a lock" - ); - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event::Event::Resumed - ); - } else { - warn!("Received `Event::WindowCreated` while `ndk_glue::native_window()` provides no window"); + // Process input events + // + // Note that GameActivity doesn't integrate input events with the mainloop, + // they are double buffered and it's assumed that the application will be + // rendering continuously. + + self.android_app.input_events(|event| { + match event { + InputEvent::MotionEvent(motion_event) => { + let window_id = window::WindowId(WindowId); + let device_id = event::DeviceId(DeviceId); + + let phase = match motion_event.action() { + MotionAction::Down | MotionAction::PointerDown => { + Some(event::TouchPhase::Started) } - } - Event::WindowResized => resized = true, - Event::WindowRedrawNeeded => redraw = true, - Event::WindowDestroyed => { - // Release the lock, allowing Android to clean up this surface - // WARNING: See above - if ndk-glue is racy, this event may be called - // without having a `self.window_lock` in place. - if self.window_lock.take().is_some() { - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event::Event::Suspended - ); - } else { - warn!("Received `Event::WindowDestroyed` while we were not holding a window lock"); + MotionAction::Up | MotionAction::PointerUp => { + Some(event::TouchPhase::Ended) } - } - Event::Pause => self.running = false, - Event::Resume => self.running = true, - Event::ConfigChanged => { - #[allow(deprecated)] // TODO: rust-windowing/winit#2196 - let am = ndk_glue::native_activity().asset_manager(); - let config = Configuration::from_asset_manager(&am); - let old_scale_factor = MonitorHandle.scale_factor(); - *CONFIG.write().unwrap() = config; - let scale_factor = MonitorHandle.scale_factor(); - if (scale_factor - old_scale_factor).abs() < f64::EPSILON { - let mut size = MonitorHandle.size(); + MotionAction::Move => Some(event::TouchPhase::Moved), + MotionAction::Cancel => { + Some(event::TouchPhase::Cancelled) + } + _ => { + None // TODO mouse events + } + }; + if let Some(phase) = phase { + let pointers: Box< + dyn Iterator>, + > = match phase { + event::TouchPhase::Started + | event::TouchPhase::Ended => { + Box::new( + std::iter::once(motion_event.pointer_at_index( + motion_event.pointer_index(), + )) + ) + }, + event::TouchPhase::Moved + | event::TouchPhase::Cancelled => { + Box::new(motion_event.pointers()) + } + }; + + for pointer in pointers { + let location = PhysicalPosition { + x: pointer.x() as _, + y: pointer.y() as _, + }; + trace!("Input event {device_id:?}, {phase:?}, loc={location:?}, pointer={pointer:?}"); let event = event::Event::WindowEvent { - window_id: window::WindowId(WindowId), - event: event::WindowEvent::ScaleFactorChanged { - new_inner_size: &mut size, - scale_factor, - }, + window_id, + event: event::WindowEvent::Touch( + event::Touch { + device_id, + phase, + location, + id: pointer.pointer_id() as u64, + force: None, + }, + ), }; - call_event_handler!( - event_handler, + sticky_exit_callback( + event, self.window_target(), control_flow, - event + callback ); } } - Event::WindowHasFocus => { - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event::Event::WindowEvent { - window_id: window::WindowId(WindowId), - event: event::WindowEvent::Focused(true), - } - ); - } - Event::WindowLostFocus => { - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event::Event::WindowEvent { - window_id: window::WindowId(WindowId), - event: event::WindowEvent::Focused(false), - } - ); - } - _ => {} - }, - Some(EventSource::InputQueue) => { - if let Some(input_queue) = ndk_glue::input_queue().as_ref() { - while let Some(event) = input_queue.get_event().expect("get_event") { - if let Some(event) = input_queue.pre_dispatch(event) { - let mut handled = true; - let window_id = window::WindowId(WindowId); - let device_id = event::DeviceId(DeviceId); - match &event { - InputEvent::MotionEvent(motion_event) => { - let phase = match motion_event.action() { - MotionAction::Down | MotionAction::PointerDown => { - Some(event::TouchPhase::Started) - } - MotionAction::Up | MotionAction::PointerUp => { - Some(event::TouchPhase::Ended) - } - MotionAction::Move => Some(event::TouchPhase::Moved), - MotionAction::Cancel => { - Some(event::TouchPhase::Cancelled) - } - _ => { - handled = false; - None // TODO mouse events - } - }; - if let Some(phase) = phase { - let pointers: Box< - dyn Iterator>, - > = match phase { - event::TouchPhase::Started - | event::TouchPhase::Ended => Box::new( - std::iter::once(motion_event.pointer_at_index( - motion_event.pointer_index(), - )), - ), - event::TouchPhase::Moved - | event::TouchPhase::Cancelled => { - Box::new(motion_event.pointers()) - } - }; - - for pointer in pointers { - let location = PhysicalPosition { - x: pointer.x() as _, - y: pointer.y() as _, - }; - let event = event::Event::WindowEvent { - window_id, - event: event::WindowEvent::Touch( - event::Touch { - device_id, - phase, - location, - id: pointer.pointer_id() as u64, - force: None, - }, - ), - }; - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event - ); - } - } - } - InputEvent::KeyEvent(key) => { - let state = match key.action() { - KeyAction::Down => event::ElementState::Pressed, - KeyAction::Up => event::ElementState::Released, - _ => event::ElementState::Released, - }; - #[allow(deprecated)] - let event = event::Event::WindowEvent { - window_id, - event: event::WindowEvent::KeyboardInput { - device_id, - input: event::KeyboardInput { - scancode: key.scan_code() as u32, - state, - virtual_keycode: ndk_keycode_to_virtualkeycode( - key.key_code(), - ), - modifiers: event::ModifiersState::default(), - }, - is_synthetic: false, - }, - }; - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event - ); - } - }; - input_queue.finish_event(event, handled); - } - } - } } - Some(EventSource::User) => { - // try_recv only errors when empty (expected) or disconnect. But because Self - // contains a Sender it will never disconnect, so no error handling need. - while let Ok(event) = self.user_events_receiver.try_recv() { - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event::Event::UserEvent(event) - ); - } + InputEvent::KeyEvent(key) => { + let device_id = event::DeviceId(DeviceId); + + let state = match key.action() { + KeyAction::Down => event::ElementState::Pressed, + KeyAction::Up => event::ElementState::Released, + _ => event::ElementState::Released, + }; + #[allow(deprecated)] + let event = event::Event::WindowEvent { + window_id: window::WindowId(WindowId), + event: event::WindowEvent::KeyboardInput { + device_id, + input: event::KeyboardInput { + scancode: key.scan_code() as u32, + state, + virtual_keycode: ndk_keycode_to_virtualkeycode( + key.key_code(), + ), + modifiers: event::ModifiersState::default(), + }, + is_synthetic: false, + }, + }; + sticky_exit_callback( + event, + self.window_target(), + control_flow, + callback + ); + } + _ => { + warn!("Unknown android_activity input event {event:?}") } - Some(EventSource::Internal(internal)) => match internal { - InternalEvent::RedrawRequested => redraw = true, - }, - None => {} } + }); + + // Empty the user event buffer + { + while let Ok(event) = self.user_events_receiver.try_recv() { + sticky_exit_callback( + crate::event::Event::UserEvent(event), + self.window_target(), + control_flow, + callback, + ); + } + } - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event::Event::MainEventsCleared - ); - - if resized && self.running { - let size = MonitorHandle.size(); + sticky_exit_callback( + event::Event::MainEventsCleared, + self.window_target(), + control_flow, + callback, + ); + + if self.running { + if resized { + let size = if let Some(native_window) = self.android_app.native_window().as_ref() { + let width = native_window.width() as _; + let height = native_window.height() as _; + PhysicalSize::new(width, height) + } else { + PhysicalSize::new(0, 0) + }; let event = event::Event::WindowEvent { window_id: window::WindowId(WindowId), event: event::WindowEvent::Resized(size), }; - call_event_handler!(event_handler, self.window_target(), control_flow, event); + sticky_exit_callback(event, self.window_target(), control_flow, callback); } - if redraw && self.running { + *pending_redraw |= self.redraw_flag.get_and_reset(); + if *pending_redraw { + *pending_redraw = false; let event = event::Event::RedrawRequested(window::WindowId(WindowId)); - call_event_handler!(event_handler, self.window_target(), control_flow, event); + sticky_exit_callback(event, self.window_target(), control_flow, callback); } + } - call_event_handler!( - event_handler, - self.window_target(), - control_flow, - event::Event::RedrawEventsCleared - ); - - match control_flow { - ControlFlow::ExitWithCode(code) => { - self.first_event = poll( - self.looper - .poll_once_timeout(Duration::from_millis(0)) - .unwrap(), - ); - self.start_cause = event::StartCause::WaitCancelled { - start: Instant::now(), - requested_resume: None, - }; - break 'event_loop code; - } - ControlFlow::Poll => { - self.first_event = poll( - self.looper - .poll_all_timeout(Duration::from_millis(0)) - .unwrap(), - ); - self.start_cause = event::StartCause::Poll; - } - ControlFlow::Wait => { - self.first_event = poll(self.looper.poll_all().unwrap()); - self.start_cause = event::StartCause::WaitCancelled { - start: Instant::now(), - requested_resume: None, + sticky_exit_callback( + event::Event::RedrawEventsCleared, + self.window_target(), + control_flow, + callback, + ); + + let start = Instant::now(); + let (deadline, timeout); + + match control_flow { + ControlFlow::ExitWithCode(_) => { + deadline = None; + timeout = None; + } + ControlFlow::Poll => { + *cause = StartCause::Poll; + deadline = None; + timeout = Some(Duration::from_millis(0)); + } + ControlFlow::Wait => { + *cause = StartCause::WaitCancelled { + start, + requested_resume: None, + }; + deadline = None; + timeout = None; + } + ControlFlow::WaitUntil(wait_deadline) => { + *cause = StartCause::ResumeTimeReached { + start, + requested_resume: *wait_deadline, + }; + timeout = if *wait_deadline > start { + Some(*wait_deadline - start) + } else { + Some(Duration::from_millis(0)) + }; + deadline = Some(*wait_deadline); + } + } + + IterationResult { + wait_start: start, + deadline, + timeout, + } + } + + pub fn run(mut self, event_handler: F) -> ! + where + F: 'static + + FnMut(event::Event<'_, T>, &event_loop::EventLoopWindowTarget, &mut ControlFlow), + { + let exit_code = self.run_return(event_handler); + ::std::process::exit(exit_code); + } + + pub fn run_return(&mut self, mut callback: F) -> i32 + where + F: FnMut(event::Event<'_, T>, &RootELW, &mut ControlFlow), + { + let mut control_flow = ControlFlow::default(); + let mut cause = StartCause::Init; + let mut pending_redraw = false; + + // run the initial loop iteration + let mut iter_result = self.single_iteration( + &mut control_flow, + None, + &mut pending_redraw, + &mut cause, + &mut callback, + ); + + let exit_code = loop { + if let ControlFlow::ExitWithCode(code) = control_flow { + break code; + } + + let mut timeout = iter_result.timeout; + + // If we already have work to do then we don't want to block on the next poll... + pending_redraw |= self.redraw_flag.get_and_reset(); + if self.running && (pending_redraw || self.user_events_receiver.has_incoming()) { + timeout = Some(Duration::from_millis(0)) + } + + let app = self.android_app.clone(); // Don't borrow self as part of poll expression + app.poll_events(timeout, |poll_event| { + let mut main_event = None; + + match poll_event { + android_activity::PollEvent::Wake => { + // In the X11 backend it's noted that too many false-positive wake ups + // would cause the event loop to run continuously. They handle this by re-checking + // for pending events (assuming they cover all valid reasons for a wake up). + // + // For now, user_events and redraw_requests are the only reasons to expect + // a wake up here so we can ignore the wake up if there are no events/requests. + // We also ignore wake ups while suspended. + pending_redraw |= self.redraw_flag.get_and_reset(); + if !self.running + || (!pending_redraw && !self.user_events_receiver.has_incoming()) + { + return; + } + } + android_activity::PollEvent::Timeout => {} + android_activity::PollEvent::Main(event) => { + main_event = Some(event); + } + unknown_event => { + warn!("Unknown poll event {unknown_event:?} (ignored)"); } } - ControlFlow::WaitUntil(instant) => { - let start = Instant::now(); - let duration = if instant <= start { - Duration::default() - } else { - instant - start + + let wait_cancelled = iter_result + .deadline + .map_or(false, |deadline| Instant::now() < deadline); + + if wait_cancelled { + cause = StartCause::WaitCancelled { + start: iter_result.wait_start, + requested_resume: iter_result.deadline, }; - self.first_event = poll(self.looper.poll_all_timeout(duration).unwrap()); - self.start_cause = if self.first_event.is_some() { - event::StartCause::WaitCancelled { - start, - requested_resume: Some(instant), - } - } else { - event::StartCause::ResumeTimeReached { - start, - requested_resume: instant, - } - } } - } - } + + iter_result = self.single_iteration( + &mut control_flow, + main_event, + &mut pending_redraw, + &mut cause, + &mut callback, + ); + }); + }; + + sticky_exit_callback( + event::Event::LoopDestroyed, + self.window_target(), + &mut control_flow, + &mut callback, + ); + + exit_code } pub fn window_target(&self) -> &event_loop::EventLoopWindowTarget { @@ -602,49 +785,51 @@ impl EventLoop { pub fn create_proxy(&self) -> EventLoopProxy { EventLoopProxy { user_events_sender: self.user_events_sender.clone(), - looper: ForeignLooper::for_thread().expect("called from event loop thread"), + waker: self.android_app.create_waker(), } } } pub struct EventLoopProxy { user_events_sender: mpsc::Sender, - looper: ForeignLooper, + waker: AndroidAppWaker, +} + +impl Clone for EventLoopProxy { + fn clone(&self) -> Self { + EventLoopProxy { + user_events_sender: self.user_events_sender.clone(), + waker: self.waker.clone(), + } + } } impl EventLoopProxy { pub fn send_event(&self, event: T) -> Result<(), event_loop::EventLoopClosed> { self.user_events_sender .send(event) - .map_err(|mpsc::SendError(x)| event_loop::EventLoopClosed(x))?; - self.looper.wake(); + .map_err(|err| event_loop::EventLoopClosed(err.0))?; + self.waker.wake(); Ok(()) } } -impl Clone for EventLoopProxy { - fn clone(&self) -> Self { - EventLoopProxy { - user_events_sender: self.user_events_sender.clone(), - looper: self.looper.clone(), - } - } -} - pub struct EventLoopWindowTarget { + app: AndroidApp, + redraw_requester: RedrawRequester, _marker: std::marker::PhantomData, } impl EventLoopWindowTarget { pub fn primary_monitor(&self) -> Option { Some(monitor::MonitorHandle { - inner: MonitorHandle, + inner: MonitorHandle::new(self.app.clone()), }) } pub fn available_monitors(&self) -> VecDeque { let mut v = VecDeque::with_capacity(1); - v.push_back(MonitorHandle); + v.push_back(MonitorHandle::new(self.app.clone())); v } @@ -686,16 +871,23 @@ impl DeviceId { #[derive(Clone, Copy, Debug, Default, Eq, PartialEq)] pub struct PlatformSpecificWindowBuilderAttributes; -pub struct Window; +pub struct Window { + app: AndroidApp, + redraw_requester: RedrawRequester, +} impl Window { pub(crate) fn new( - _el: &EventLoopWindowTarget, + el: &EventLoopWindowTarget, _window_attrs: window::WindowAttributes, _: PlatformSpecificWindowBuilderAttributes, ) -> Result { // FIXME this ignores requested window attributes - Ok(Self) + + Ok(Self { + app: el.app.clone(), + redraw_requester: el.redraw_requester.clone(), + }) } pub fn id(&self) -> WindowId { @@ -704,29 +896,28 @@ impl Window { pub fn primary_monitor(&self) -> Option { Some(monitor::MonitorHandle { - inner: MonitorHandle, + inner: MonitorHandle::new(self.app.clone()), }) } pub fn available_monitors(&self) -> VecDeque { let mut v = VecDeque::with_capacity(1); - v.push_back(MonitorHandle); + v.push_back(MonitorHandle::new(self.app.clone())); v } pub fn current_monitor(&self) -> Option { Some(monitor::MonitorHandle { - inner: MonitorHandle, + inner: MonitorHandle::new(self.app.clone()), }) } pub fn scale_factor(&self) -> f64 { - MonitorHandle.scale_factor() + MonitorHandle::new(self.app.clone()).scale_factor() } pub fn request_redraw(&self) { - *INTERNAL_EVENT.write().unwrap() = Some(InternalEvent::RedrawRequested); - ForeignLooper::for_thread().unwrap().wake(); + self.redraw_requester.request_redraw() } pub fn inner_position(&self) -> Result, error::NotSupportedError> { @@ -750,7 +941,7 @@ impl Window { } pub fn outer_size(&self) -> PhysicalSize { - MonitorHandle.size() + MonitorHandle::new(self.app.clone()).size() } pub fn set_min_inner_size(&self, _: Option) {} @@ -840,7 +1031,7 @@ impl Window { } pub fn raw_window_handle(&self) -> RawWindowHandle { - if let Some(native_window) = ndk_glue::native_window() { + if let Some(native_window) = self.app.native_window().as_ref() { native_window.raw_window_handle() } else { panic!("Cannot get the native window, it's null and will always be null before Event::Resumed and after Event::Suspended. Make sure you only call this function between those events."); @@ -851,12 +1042,12 @@ impl Window { RawDisplayHandle::Android(AndroidDisplayHandle::empty()) } - pub fn config(&self) -> Configuration { - CONFIG.read().unwrap().clone() + pub fn config(&self) -> ConfigurationRef { + self.app.config() } pub fn content_rect(&self) -> Rect { - ndk_glue::content_rect() + self.app.content_rect() } } @@ -872,19 +1063,33 @@ impl Display for OsError { pub(crate) use crate::icon::NoIcon as PlatformIcon; -#[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)] -pub struct MonitorHandle; +#[derive(Clone, Debug, PartialEq, Eq, Hash)] +pub struct MonitorHandle { + app: AndroidApp, +} +impl PartialOrd for MonitorHandle { + fn partial_cmp(&self, _other: &Self) -> Option { + Some(std::cmp::Ordering::Equal) + } +} +impl Ord for MonitorHandle { + fn cmp(&self, _other: &Self) -> std::cmp::Ordering { + std::cmp::Ordering::Equal + } +} impl MonitorHandle { + pub(crate) fn new(app: AndroidApp) -> Self { + Self { app } + } + pub fn name(&self) -> Option { Some("Android Device".to_owned()) } pub fn size(&self) -> PhysicalSize { - if let Some(native_window) = ndk_glue::native_window().as_ref() { - let width = native_window.width() as _; - let height = native_window.height() as _; - PhysicalSize::new(width, height) + if let Some(native_window) = self.app.native_window() { + PhysicalSize::new(native_window.width() as _, native_window.height() as _) } else { PhysicalSize::new(0, 0) } @@ -895,8 +1100,8 @@ impl MonitorHandle { } pub fn scale_factor(&self) -> f64 { - let config = CONFIG.read().unwrap(); - config + self.app + .config() .density() .map(|dpi| dpi as f64 / 160.0) .unwrap_or(1.0)