Add set_theme to event loot target

src/event_loop.rs

@@ -17,8 +17,12 @@ use instant::Instant;
 use std::{error, fmt, marker::PhantomData, ops::Deref};
 
 use crate::{
-  dpi::PhysicalPosition, error::ExternalError, event::Event, monitor::MonitorHandle, platform_impl,
-  window::ProgressBarState,
+  dpi::PhysicalPosition,
+  error::ExternalError,
+  event::Event,
+  monitor::MonitorHandle,
+  platform_impl,
+  window::{ProgressBarState, Theme},
 };
 
 /// Provides a way to retrieve events from the system and from the windows that were registered to
@@ -296,6 +300,19 @@ impl<T> EventLoopWindowTarget<T> {
     #[cfg(any(target_os = "linux", target_os = "macos"))]
     self.p.set_progress_bar(_progress)
   }
+
+  /// Sets the theme for this window.
+  ///
+  /// ## Platform-specific
+  ///
+  /// - **Linux / macOS**: Theme is app-wide and not specific to this window.
+  /// - **Windows:** Unsupported. Use the set_theme function available in Window (Windows can have different themes for different windows)
+  /// - **iOS / Android:** Unsupported.
+  #[inline]
+  pub fn set_theme(&self, #[allow(unused)] theme: Option<Theme>) {
+    #[cfg(any(target_os = "linux", target_os = "macos"))]
+    self.p.set_theme(theme)
+  }
 }
 
 #[cfg(feature = "rwh_05")]

src/platform_impl/linux/event_loop.rs

@@ -156,7 +156,17 @@ impl<T> EventLoopWindowTarget<T> {
       .window_requests_tx
       .send((WindowId::dummy(), WindowRequest::ProgressBarState(progress)))
     {
-      log::warn!("Fail to send update progress bar request: {}", e);
+      log::warn!("Fail to send update progress bar request: {e}");
+    }
+  }
+
+  #[inline]
+  pub fn set_theme(&self, theme: Option<Theme>) {
+    if let Err(e) = self
+      .window_requests_tx
+      .send((WindowId::dummy(), WindowRequest::SetTheme(theme)))
+    {
+      log::warn!("Fail to send update theme request: {e}");
     }
   }
 }

src/platform_impl/macos/event_loop.rs

@@ -36,7 +36,7 @@ use crate::{
     observer::*,
     util::{self, IdRef},
   },
-  platform_impl::set_progress_indicator,
+  platform_impl::{set_ns_theme, set_progress_indicator},
   window::ProgressBarState,
 };
 
@@ -120,6 +120,11 @@ impl<T: 'static> EventLoopWindowTarget<T> {
   pub fn set_progress_bar(&self, progress: ProgressBarState) {
     set_progress_indicator(progress);
   }
+
+  #[inline]
+  pub fn set_theme(&self, theme: Option<Theme>) {
+    set_ns_theme(theme)
+  }
 }
 
 pub struct EventLoop<T: 'static> {