expose set_device_event_filter in tauri (#5562)

Co-authored-by: Lucas Nogueira <lucas@tauri.studio>
Closes https://github.com/tauri-apps/tauri/issues/5496

.changes/expose-set_device_event_filter-in-tauri-api.md

@@ -0,0 +1,7 @@
+---
+"tauri-runtime-wry": minor
+"tauri-runtime": minor
+"tauri": minor
+---
+
+Added `Builder::device_event_filter` and `App::set_device_event_filter` methods.

core/tauri-runtime-wry/src/lib.rs

@@ -14,8 +14,8 @@ use tauri_runtime::{
     dpi::{LogicalPosition, LogicalSize, PhysicalPosition, PhysicalSize, Position, Size},
     CursorIcon, DetachedWindow, FileDropEvent, JsEventListenerKey, PendingWindow, WindowEvent,
   },
-  Dispatch, Error, EventLoopProxy, ExitRequestedEventAction, Icon, Result, RunEvent, RunIteration,
-  Runtime, RuntimeHandle, UserAttentionType, UserEvent,
+  DeviceEventFilter, Dispatch, Error, EventLoopProxy, ExitRequestedEventAction, Icon, Result,
+  RunEvent, RunIteration, Runtime, RuntimeHandle, UserAttentionType, UserEvent,
 };
 
 use tauri_runtime::window::MenuEvent;
@@ -47,7 +47,8 @@ use wry::{
     },
     event::{Event, StartCause, WindowEvent as WryWindowEvent},
     event_loop::{
-      ControlFlow, EventLoop, EventLoopProxy as WryEventLoopProxy, EventLoopWindowTarget,
+      ControlFlow, DeviceEventFilter as WryDeviceEventFilter, EventLoop,
+      EventLoopProxy as WryEventLoopProxy, EventLoopWindowTarget,
     },
     menu::{
       AboutMetadata as WryAboutMetadata, CustomMenuItem as WryCustomMenuItem, MenuBar,
@@ -64,7 +65,6 @@ use wry::{
   webview::{FileDropEvent as WryFileDropEvent, WebContext, WebView, WebViewBuilder},
 };
 
-pub use wry;
 pub use wry::application::window::{Window, WindowBuilder as WryWindowBuilder, WindowId};
 
 #[cfg(windows)]
@@ -364,6 +364,18 @@ impl From<MenuItem> for MenuItemWrapper {
   }
 }
 
+pub struct DeviceEventFilterWrapper(pub WryDeviceEventFilter);
+
+impl From<DeviceEventFilter> for DeviceEventFilterWrapper {
+  fn from(item: DeviceEventFilter) -> Self {
+    match item {
+      DeviceEventFilter::Always => Self(WryDeviceEventFilter::Always),
+      DeviceEventFilter::Never => Self(WryDeviceEventFilter::Never),
+      DeviceEventFilter::Unfocused => Self(WryDeviceEventFilter::Unfocused),
+    }
+  }
+}
+
 #[cfg(target_os = "macos")]
 pub struct NativeImageWrapper(pub WryNativeImage);
 
@@ -2055,6 +2067,12 @@ impl<T: UserEvent> Runtime<T> for Wry<T> {
     self.event_loop.hide_application();
   }
 
+  fn set_device_event_filter(&mut self, filter: DeviceEventFilter) {
+    self
+      .event_loop
+      .set_device_event_filter(DeviceEventFilterWrapper::from(filter).0);
+  }
+
   #[cfg(desktop)]
   fn run_iteration<F: FnMut(RunEvent<T>) + 'static>(&mut self, mut callback: F) -> RunIteration {
     use wry::application::platform::run_return::EventLoopExtRunReturn;

core/tauri-runtime/src/lib.rs

@@ -184,6 +184,23 @@ pub enum UserAttentionType {
   Informational,
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize)]
+#[serde(tag = "type")]
+pub enum DeviceEventFilter {
+  /// Always filter out device events.
+  Always,
+  /// Filter out device events while the window is not focused.
+  Unfocused,
+  /// Report all device events regardless of window focus.
+  Never,
+}
+
+impl Default for DeviceEventFilter {
+  fn default() -> Self {
+    Self::Unfocused
+  }
+}
+
 #[derive(Debug, thiserror::Error)]
 #[non_exhaustive]
 pub enum Error {
@@ -461,6 +478,19 @@ pub trait Runtime<T: UserEvent>: Debug + Sized + 'static {
   #[cfg_attr(doc_cfg, doc(cfg(target_os = "macos")))]
   fn hide(&self);
 
+  /// Change the device event filter mode.
+  ///
+  /// Since the DeviceEvent capture can lead to high CPU usage for unfocused windows, [`tao`]
+  /// will ignore them by default for unfocused windows on Windows. This method allows changing
+  /// the filter to explicitly capture them again.
+  ///
+  /// ## Platform-specific
+  ///
+  /// - ** Linux / macOS / iOS / Android**: Unsupported.
+  ///
+  /// [`tao`]: https://crates.io/crates/tao
+  fn set_device_event_filter(&mut self, filter: DeviceEventFilter);
+
   /// Runs the one step of the webview runtime event loop and returns control flow to the caller.
   #[cfg(desktop)]
   fn run_iteration<F: Fn(RunEvent<T>) + 'static>(&mut self, callback: F) -> RunIteration;

core/tauri/src/app.rs

@@ -23,8 +23,8 @@ use crate::{
   sealed::{ManagerBase, RuntimeOrDispatch},
   utils::config::Config,
   utils::{assets::Assets, resources::resource_relpath, Env},
-  Context, EventLoopMessage, Invoke, InvokeError, InvokeResponse, Manager, Runtime, Scopes,
-  StateManager, Theme, Window,
+  Context, DeviceEventFilter, EventLoopMessage, Invoke, InvokeError, InvokeResponse, Manager,
+  Runtime, Scopes, StateManager, Theme, Window,
 };
 
 #[cfg(shell_scope)]
@@ -805,6 +805,35 @@ impl<R: Runtime> App<R> {
       .set_activation_policy(activation_policy);
   }
 
+  /// Change the device event filter mode.
+  ///
+  /// Since the DeviceEvent capture can lead to high CPU usage for unfocused windows, [`tao`]
+  /// will ignore them by default for unfocused windows on Windows. This method allows changing
+  /// the filter to explicitly capture them again.
+  ///
+  /// ## Platform-specific
+  ///
+  /// - ** Linux / macOS / iOS / Android**: Unsupported.
+  ///
+  /// # Examples
+  /// ```,no_run
+  /// let mut app = tauri::Builder::default()
+  ///   // on an actual app, remove the string argument
+  ///   .build(tauri::generate_context!("test/fixture/src-tauri/tauri.conf.json"))
+  ///   .expect("error while building tauri application");
+  /// app.set_device_event_filter(tauri::DeviceEventFilter::Always);
+  /// app.run(|_app_handle, _event| {});
+  /// ```
+  ///
+  /// [`tao`]: https://crates.io/crates/tao
+  pub fn set_device_event_filter(&mut self, filter: DeviceEventFilter) {
+    self
+      .runtime
+      .as_mut()
+      .unwrap()
+      .set_device_event_filter(filter);
+  }
+
   /// Gets the argument matches of the CLI definition configured in `tauri.conf.json`.
   ///
   /// # Examples
@@ -1008,6 +1037,9 @@ pub struct Builder<R: Runtime> {
   /// The updater configuration.
   #[cfg(updater)]
   updater_settings: UpdaterSettings,
+
+  /// The device event filter.
+  device_event_filter: DeviceEventFilter,
 }
 
 impl<R: Runtime> Builder<R> {
@@ -1036,6 +1068,7 @@ impl<R: Runtime> Builder<R> {
       system_tray_event_listeners: Vec::new(),
       #[cfg(updater)]
       updater_settings: Default::default(),
+      device_event_filter: Default::default(),
     }
   }
 
@@ -1486,6 +1519,28 @@ impl<R: Runtime> Builder<R> {
     self
   }
 
+  /// Change the device event filter mode.
+  ///
+  /// Since the DeviceEvent capture can lead to high CPU usage for unfocused windows, [`tao`]
+  /// will ignore them by default for unfocused windows on Windows. This method allows changing
+  /// the filter to explicitly capture them again.
+  ///
+  /// ## Platform-specific
+  ///
+  /// - ** Linux / macOS / iOS / Android**: Unsupported.
+  ///
+  /// # Examples
+  /// ```,no_run
+  /// tauri::Builder::default()
+  ///   .device_event_filter(tauri::DeviceEventFilter::Always);
+  /// ```
+  ///
+  /// [`tao`]: https://crates.io/crates/tao
+  pub fn device_event_filter(mut self, filter: DeviceEventFilter) -> Self {
+    self.device_event_filter = filter;
+    self
+  }
+
   /// Builds the application.
   #[allow(clippy::type_complexity)]
   pub fn build<A: Assets>(mut self, context: Context<A>) -> crate::Result<App<R>> {
@@ -1531,13 +1586,15 @@ impl<R: Runtime> Builder<R> {
     }
 
     #[cfg(any(windows, target_os = "linux"))]
-    let runtime = if self.runtime_any_thread {
+    let mut runtime = if self.runtime_any_thread {
       R::new_any_thread()?
     } else {
       R::new()?
     };
     #[cfg(not(any(windows, target_os = "linux")))]
-    let runtime = R::new()?;
+    let mut runtime = R::new()?;
+
+    runtime.set_device_event_filter(self.device_event_filter);
 
     let runtime_handle = runtime.handle();
 

core/tauri/src/lib.rs

@@ -244,7 +244,7 @@ pub use {
       dpi::{LogicalPosition, LogicalSize, PhysicalPosition, PhysicalSize, Pixel, Position, Size},
       CursorIcon, FileDropEvent,
     },
-    RunIteration, UserAttentionType,
+    DeviceEventFilter, RunIteration, UserAttentionType,
   },
   self::state::{State, StateManager},
   self::utils::{

core/tauri/src/test/mock_runtime.rs

@@ -12,8 +12,8 @@ use tauri_runtime::{
     dpi::{PhysicalPosition, PhysicalSize, Position, Size},
     CursorIcon, DetachedWindow, MenuEvent, PendingWindow, WindowEvent,
   },
-  Dispatch, EventLoopProxy, Icon, Result, RunEvent, Runtime, RuntimeHandle, UserAttentionType,
-  UserEvent,
+  DeviceEventFilter, Dispatch, EventLoopProxy, Icon, Result, RunEvent, Runtime, RuntimeHandle,
+  UserAttentionType, UserEvent,
 };
 #[cfg(all(desktop, feature = "system-tray"))]
 use tauri_runtime::{
@@ -711,6 +711,8 @@ impl<T: UserEvent> Runtime<T> for MockRuntime {
   #[cfg_attr(doc_cfg, doc(cfg(target_os = "macos")))]
   fn hide(&self) {}
 
+  fn set_device_event_filter(&mut self, filter: DeviceEventFilter) {}
+
   #[cfg(any(
     target_os = "macos",
     windows,