feat(core): add window_class name API on Windows (#11469)

* On Windows, set name of Window Class, closes #7498
allow to customize it instead of current value hard coded "Window Class"

* feat(windows): add window_classname, closes #7498
allow to customize the window class name instead of current value hard coded "Window Class"

    * feat: add window_classname, closes #7498

    * add changes file

    * Update core/tauri-config-schema/schema.json

    * Update tooling/cli/schema.json

* missing pieces after merge

* clippy

---------

Co-authored-by: Géraud-Loup <47665233+geraudloup@users.noreply.github.com>
Co-authored-by: Lucas Nogueira <lucas@tauri.app>

.changes/window-class-name-config-api.md

@@ -0,0 +1,5 @@
+---
+"@tauri-apps/api": 'minor:feat'
+---
+
+Added `windowClassname` option, when constructing a `Webview` or `WebviewWindow`, to specify the name of the window class on Windows.

.changes/window-class-name-config.md

@@ -0,0 +1,6 @@
+---
+"tauri": 'minor:feat'
+"tauri-utils": 'minor:feat'
+---
+
+Added `app > windows > windowClassname` config option to specify the name of the window class on Windows.

.changes/window-class-name.md

@@ -0,0 +1,7 @@
+---
+"tauri": 'minor:feat'
+"tauri-runtime-wry": 'minor:feat'
+"tauri-runtime": 'minor:feat'
+---
+
+Added `WindowBuilder/WebviewWindowBuilder::window_classname` method to specify the name of the window class on Windows.

crates/tauri-cli/config.schema.json

@@ -397,6 +397,13 @@
           "default": false,
           "type": "boolean"
         },
+        "windowClassname": {
+          "description": "The name of the window class created on Windows to create the window. **Windows only**.",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
         "theme": {
           "description": "The initial window theme. Defaults to the system theme. Only implemented on Windows and macOS 10.14+.",
           "anyOf": [

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

@@ -763,6 +763,11 @@ impl WindowBuilder for WindowBuilderWrapper {
 
     builder = builder.title("Tauri App");
 
+    #[cfg(windows)]
+    {
+      builder = builder.window_classname("Tauri Window");
+    }
+
     builder
   }
 
@@ -846,6 +851,10 @@ impl WindowBuilder for WindowBuilderWrapper {
       if config.center {
         window = window.center();
       }
+
+      if let Some(window_classname) = &config.window_classname {
+        window = window.window_classname(window_classname);
+      }
     }
 
     window
@@ -1106,6 +1115,16 @@ impl WindowBuilder for WindowBuilderWrapper {
       _ => Theme::Light,
     })
   }
+
+  #[cfg(windows)]
+  fn window_classname<S: Into<String>>(mut self, window_classname: S) -> Self {
+    self.inner = self.inner.with_window_classname(window_classname);
+    self
+  }
+  #[cfg(not(windows))]
+  fn window_classname<S: Into<String>>(self, _window_classname: S) -> Self {
+    self
+  }
 }
 
 #[cfg(any(

crates/tauri-runtime/src/window.rs

@@ -438,6 +438,10 @@ pub trait WindowBuilder: WindowBuilderBase {
   fn has_icon(&self) -> bool;
 
   fn get_theme(&self) -> Option<Theme>;
+
+  /// Sets custom name for Windows' window class. **Windows only**.
+  #[must_use]
+  fn window_classname<S: Into<String>>(self, window_classname: S) -> Self;
 }
 
 /// A window that has yet to be built.

crates/tauri-schema-generator/schemas/config.schema.json

@@ -397,6 +397,13 @@
           "default": false,
           "type": "boolean"
         },
+        "windowClassname": {
+          "description": "The name of the window class created on Windows to create the window. **Windows only**.",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
         "theme": {
           "description": "The initial window theme. Defaults to the system theme. Only implemented on Windows and macOS 10.14+.",
           "anyOf": [

crates/tauri-utils/src/config.rs

@@ -1429,6 +1429,8 @@ pub struct WindowConfig {
   /// If `true`, hides the window icon from the taskbar on Windows and Linux.
   #[serde(default, alias = "skip-taskbar")]
   pub skip_taskbar: bool,
+  /// The name of the window class created on Windows to create the window. **Windows only**.
+  pub window_classname: Option<String>,
   /// The initial window theme. Defaults to the system theme. Only implemented on Windows and macOS 10.14+.
   pub theme: Option<crate::Theme>,
   /// The style of the macOS title bar.
@@ -1566,6 +1568,7 @@ impl Default for WindowConfig {
       visible_on_all_workspaces: false,
       content_protected: false,
       skip_taskbar: false,
+      window_classname: None,
       theme: None,
       title_bar_style: Default::default(),
       hidden_title: false,
@@ -2539,6 +2542,7 @@ mod build {
       let visible_on_all_workspaces = self.visible_on_all_workspaces;
       let content_protected = self.content_protected;
       let skip_taskbar = self.skip_taskbar;
+      let window_classname = opt_str_lit(self.window_classname.as_ref());
       let theme = opt_lit(self.theme.as_ref());
       let title_bar_style = &self.title_bar_style;
       let hidden_title = self.hidden_title;
@@ -2587,6 +2591,7 @@ mod build {
         visible_on_all_workspaces,
         content_protected,
         skip_taskbar,
+        window_classname,
         theme,
         title_bar_style,
         hidden_title,

crates/tauri/src/test/mock_runtime.rs

@@ -421,6 +421,10 @@ impl WindowBuilder for MockWindowBuilder {
     self
   }
 
+  fn window_classname<S: Into<String>>(self, classname: S) -> Self {
+    self
+  }
+
   fn shadow(self, enable: bool) -> Self {
     self
   }

crates/tauri/src/webview/webview_window.rs

@@ -571,6 +571,13 @@ impl<'a, R: Runtime, M: Manager<R>> WebviewWindowBuilder<'a, R, M> {
     self
   }
 
+  /// Sets custom name for Windows' window class.  **Windows only**.
+  #[must_use]
+  pub fn window_classname<S: Into<String>>(mut self, classname: S) -> Self {
+    self.window_builder = self.window_builder.window_classname(classname);
+    self
+  }
+
   /// Sets whether or not the window has shadow.
   ///
   /// ## Platform-specific

crates/tauri/src/window/mod.rs

@@ -645,6 +645,13 @@ impl<'a, R: Runtime, M: Manager<R>> WindowBuilder<'a, R, M> {
     self
   }
 
+  /// Sets custom name for Windows' window class. **Windows only**.
+  #[must_use]
+  pub fn window_classname<S: Into<String>>(mut self, classname: S) -> Self {
+    self.window_builder = self.window_builder.window_classname(classname);
+    self
+  }
+
   /// Sets whether or not the window has shadow.
   ///
   /// ## Platform-specific