Add an interface for creating system trays

Cargo.toml

@@ -37,6 +37,7 @@ members = [
   'examples/mcu-embassy',
   'examples/uefi-demo',
   'examples/async-io',
+  'examples/system_tray',
   'demos/weather-demo',
   'demos/usecases/rust',
   'helper_crates/const-field-offset',
@@ -92,6 +93,7 @@ default-members = [
   'examples/todo/rust',
   'examples/virtual_keyboard/rust',
   'examples/carousel/rust',
+  'examples/system_tray',
   'demos/energy-monitor',
   'internal/backends/winit',
   'internal/backends/qt',

REUSE.toml

@@ -133,6 +133,7 @@ path = [
   "examples/orbit-animation/images/**.svg",
   "examples/sprite-sheet/images/**.png",
   "examples/speedometer/needle.png",
+  "examples/system_tray/favicon-white.png",
 
   "demos/printerdemo/ui/images/action-button-frame.png",
   "demos/printerdemo/ui/images/mcu/combo-active-background.png",

api/cpp/cbindgen.rs

@@ -320,6 +320,7 @@ fn gen_corelib(
         "Layer",
         "ContextMenu",
         "MenuItem",
+        "SystemTray",
     ];
 
     config.export.include = [

examples/system_tray/Cargo.toml

@@ -0,0 +1,21 @@
+# Copyright © SixtyFPS GmbH <info@slint.dev>
+# SPDX-License-Identifier: MIT
+
+[package]
+name = "system_tray"
+version = "1.16.0"
+authors = ["Slint Developers <info@slint.dev>"]
+edition.workspace = true
+publish = false
+license = "MIT"
+
+[[bin]]
+path = "main.rs"
+name = "system_tray"
+
+[dependencies]
+slint = { path = "../../api/rs/slint", default-features = false, features = ["renderer-femtovg", "backend-winit-x11", "compat-1-2"] }
+i-slint-core = { workspace = true, features = ["system-tray"] }
+
+[build-dependencies]
+slint-build = { path = "../../api/rs/build" }

examples/system_tray/build.rs

@@ -0,0 +1,6 @@
+// Copyright © SixtyFPS GmbH <info@slint.dev>
+// SPDX-License-Identifier: MIT
+
+fn main() {
+    println!("cargo:rustc-env=SLINT_ENABLE_EXPERIMENTAL_FEATURES=1");
+}

examples/system_tray/main.rs

@@ -0,0 +1,13 @@
+// Copyright © SixtyFPS GmbH <info@slint.dev>
+// SPDX-License-Identifier: MIT
+
+slint::slint! {
+    export component ExampleTray inherits SystemTray {
+        icon: @image-url("favicon-white.png");
+    }
+}
+
+fn main() {
+    let _tray = ExampleTray::new().unwrap();
+    slint::run_event_loop().unwrap();
+}

internal/compiler/builtins.slint

@@ -829,3 +829,8 @@ export global NativePalette {
     //-is_non_item_type
     //-is_internal
 }
+
+export component SystemTray {
+    in property <image> icon;
+    in property <string> title;
+}

internal/compiler/passes/windows.rs

@@ -143,7 +143,7 @@ pub fn ensure_window(
 
 pub fn inherits_window(component: &Rc<Component>) -> bool {
     component.root_element.borrow().builtin_type().is_none_or(|b| {
-        matches!(b.name.as_str(), "Window" | "Dialog" | "WindowItem" | "PopupWindow")
+        matches!(b.name.as_str(), "Window" | "Dialog" | "WindowItem" | "PopupWindow" | "SystemTray")
     })
 }
 

internal/compiler/typeregister.rs

@@ -630,6 +630,8 @@ impl TypeRegister {
         register.elements.remove("DropArea").unwrap();
         register.types.remove("DropEvent").unwrap(); // Also removed in xtask/src/slintdocs.rs
 
+        register.elements.remove("SystemTray").unwrap();
+
         match register.elements.get_mut("Window").unwrap() {
             ElementType::Builtin(b) => {
                 Rc::get_mut(b)

internal/core/Cargo.toml

@@ -43,6 +43,7 @@ std = [
   "i-slint-common/markdown",
   "taffy/std",
 ]
+system-tray = ["dep:ksni", "dep:tray-icon"]
 # Unsafe feature meaning that there is only one core running and all thread_local are static.
 # You can only enable this feature if you are sure that any API of this crate is only called
 # from a single core, and not in a interrupt or signal handler.
@@ -146,6 +147,12 @@ taffy = { version = "0.9", default-features = false, features = ["flexbox", "taf
 [target.'cfg(target_family = "unix")'.dependencies]
 gettext-rs = { version = "0.7.1", optional = true, features = ["gettext-system"] }
 
+[target.'cfg(any(target_os = "macos", target_os = "windows"))'.dependencies]
+tray-icon = { git = "https://github.com/expenses/tray-icon", branch = "optional-gtk", optional = true }
+
+[target.'cfg(not(any(target_os = "macos", target_os = "windows")))'.dependencies]
+ksni = { version = "0.3.3", optional = true, features = ["blocking"] }
+
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 web-time = { version = "1.0", optional = true }
 wasm-bindgen = { version = "0.2" }