feat(core): add a new function to set theme dynamically

crates/tauri-runtime-wry/Cargo.toml

@@ -23,7 +23,7 @@ wry = { version = "0.43.1", default-features = false, features = [
   "os-webview",
   "linux-body",
 ] }
-tao = { version = "0.30", default-features = false, features = ["rwh_06"] }
+tao = { version = "0.30.1", default-features = false, features = ["rwh_06"] }
 tauri-runtime = { version = "2.0.0-rc.12", path = "../tauri-runtime" }
 tauri-utils = { version = "2.0.0-rc.12", path = "../tauri-utils" }
 raw-window-handle = "0.6"

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

@@ -1200,6 +1200,7 @@ pub enum WindowMessage {
   SetIgnoreCursorEvents(bool),
   SetProgressBar(ProgressBarState),
   SetTitleBarStyle(tauri_utils::TitleBarStyle),
+  SetTheme(Option<Theme>),
   DragWindow,
   ResizeDragWindow(tauri_runtime::ResizeDirection),
   RequestRedraw,
@@ -2010,6 +2011,13 @@ impl<T: UserEvent> WindowDispatch<T> for WryWindowDispatcher<T> {
       Message::Window(self.window_id, WindowMessage::SetTitleBarStyle(style)),
     )
   }
+
+  fn set_theme(&self, theme: Option<Theme>) -> Result<()> {
+    send_user_message(
+      &self.context,
+      Message::Window(self.window_id, WindowMessage::SetTheme(theme)),
+    )
+  }
 }
 
 #[derive(Clone)]
@@ -2973,6 +2981,13 @@ fn handle_user_message<T: UserEvent>(
               }
             };
           }
+          WindowMessage::SetTheme(theme) => {
+            window.set_theme(match theme {
+              Some(Theme::Light) => Some(TaoTheme::Light),
+              Some(Theme::Dark) => Some(TaoTheme::Dark),
+              _ => None,
+            });
+          }
         }
       }
     }

crates/tauri-runtime/src/lib.rs

@@ -799,4 +799,7 @@ pub trait WindowDispatch<T: UserEvent>: Debug + Clone + Send + Sync + Sized + 's
   ///
   /// - **Linux / Windows / iOS / Android:** Unsupported.
   fn set_title_bar_style(&self, style: tauri_utils::TitleBarStyle) -> Result<()>;
+
+  /// Set the window theme.
+  fn set_theme(&self, theme: Option<Theme>) -> Result<()>;
 }

crates/tauri/build.rs

@@ -105,6 +105,7 @@ const PLUGINS: &[(&str, &[(&str, bool)])] = &[
       ("set_progress_bar", false),
       ("set_icon", false),
       ("set_title_bar_style", false),
+      ("set_theme", false),
       ("toggle_maximize", false),
       // internal
       ("internal_toggle_maximize", true),

crates/tauri/permissions/window/autogenerated/reference.md

@@ -1469,6 +1469,32 @@ Denies the set_skip_taskbar command without any pre-configured scope.
 <tr>
 <td>
 
+`core:window:allow-set-theme`
+
+</td>
+<td>
+
+Enables the set_theme command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`core:window:deny-set-theme`
+
+</td>
+<td>
+
+Denies the set_theme command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
 `core:window:allow-set-title`
 
 </td>

crates/tauri/src/test/mock_runtime.rs

@@ -951,6 +951,10 @@ impl<T: UserEvent> WindowDispatch<T> for MockWindowDispatcher {
   ) -> Result<()> {
     Ok(())
   }
+
+  fn set_theme(&self, theme: Option<Theme>) -> Result<()> {
+    Ok(())
+  }
 }
 
 #[derive(Debug, Clone)]

crates/tauri/src/webview/webview_window.rs

@@ -27,7 +27,10 @@ use crate::{
   },
 };
 use serde::Serialize;
-use tauri_utils::config::{WebviewUrl, WindowConfig};
+use tauri_utils::{
+  config::{WebviewUrl, WindowConfig},
+  Theme,
+};
 use url::Url;
 
 use crate::{
@@ -1570,6 +1573,11 @@ impl<R: Runtime> WebviewWindow<R> {
   pub fn set_title_bar_style(&self, style: tauri_utils::TitleBarStyle) -> crate::Result<()> {
     self.webview.window().set_title_bar_style(style)
   }
+
+  /// Set the window theme.
+  pub fn set_theme(&self, theme: Option<Theme>) -> crate::Result<()> {
+    self.webview.window().set_theme(theme)
+  }
 }
 
 /// Desktop webview setters and actions.

crates/tauri/src/window/mod.rs

@@ -1981,6 +1981,7 @@ tauri::Builder::default()
       })
       .map_err(Into::into)
   }
+
   /// Sets the title bar style. **macOS only**.
   pub fn set_title_bar_style(&self, style: tauri_utils::TitleBarStyle) -> crate::Result<()> {
     self
@@ -1989,6 +1990,11 @@ tauri::Builder::default()
       .set_title_bar_style(style)
       .map_err(Into::into)
   }
+
+  /// Set the window theme.
+  pub fn set_theme(&self, theme: Option<Theme>) -> crate::Result<()> {
+    self.window.dispatcher.set_theme(theme).map_err(Into::into)
+  }
 }
 
 /// Progress bar state.

crates/tauri/src/window/plugin.rs

@@ -138,6 +138,7 @@ mod desktop_commands {
   setter!(set_visible_on_all_workspaces, bool);
   setter!(set_title_bar_style, TitleBarStyle);
   setter!(set_size_constraints, WindowSizeConstraints);
+  setter!(set_theme, Option<Theme>);
 
   #[command(root = "crate")]
   pub async fn set_icon<R: Runtime>(
@@ -287,6 +288,7 @@ pub fn init<R: Runtime>() -> TauriPlugin<R> {
             desktop_commands::set_icon,
             desktop_commands::set_visible_on_all_workspaces,
             desktop_commands::set_title_bar_style,
+            desktop_commands::set_theme,
             desktop_commands::toggle_maximize,
             desktop_commands::internal_toggle_maximize,
           ]);

packages/api/src/window.ts

@@ -1676,6 +1676,16 @@ class Window {
     })
   }
 
+  /**
+   * Set window theme, pass in undefined or no parameters to follow system theme
+   */
+  async setTheme(theme?: Theme): Promise<void> {
+    return invoke('plugin:window|set_theme', {
+      label: this.label,
+      value: theme
+    })
+  }
+
   // Listeners
 
   /**