From 99c14c8f5dea9c4429d74fb4f6b5290c0f43fabc Mon Sep 17 00:00:00 2001
From: Exidex <16986685+Exidex@users.noreply.github.com>
Date: Sat, 3 Aug 2024 18:23:56 +0200
Subject: [PATCH]  Expose macOS ActivationPolicy and
 activate_ignoring_other_apps

---
 core/src/window/settings.rs       |  4 ++++
 core/src/window/settings/macos.rs | 33 ++++++++++++++++++++++++++++++-
 winit/src/application.rs          | 25 ++++++++++++++++++++++-
 3 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/core/src/window/settings.rs b/core/src/window/settings.rs
index fbbf86abd8..d55ced642a 100644
--- a/core/src/window/settings.rs
+++ b/core/src/window/settings.rs
@@ -27,7 +27,11 @@ mod platform;
 use crate::window::{Icon, Level, Position};
 use crate::Size;
 
+#[cfg(target_os = "macos")]
+pub use platform::ActivationPolicy;
+
 pub use platform::PlatformSpecific;
+
 /// The window settings of an application.
 #[derive(Debug, Clone)]
 pub struct Settings {
diff --git a/core/src/window/settings/macos.rs b/core/src/window/settings/macos.rs
index f86e63ad05..a1b6026116 100644
--- a/core/src/window/settings/macos.rs
+++ b/core/src/window/settings/macos.rs
@@ -1,7 +1,7 @@
 //! Platform specific settings for macOS.
 
 /// The platform specific window settings of an application.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct PlatformSpecific {
     /// Hides the window title.
     pub title_hidden: bool,
@@ -9,4 +9,35 @@ pub struct PlatformSpecific {
     pub titlebar_transparent: bool,
     /// Makes the window content appear behind the titlebar.
     pub fullsize_content_view: bool,
+    /// Activation policy for the application.
+    pub activation_policy: ActivationPolicy,
+    /// Used to prevent the application from automatically activating when launched if
+    /// another application is already active.
+    ///
+    /// The default behavior is to ignore other applications and activate when launched.
+    pub activate_ignoring_other_apps: bool,
+}
+
+impl Default for PlatformSpecific {
+    fn default() -> Self {
+        Self {
+            title_hidden: false,
+            titlebar_transparent: false,
+            fullsize_content_view: false,
+            activation_policy: Default::default(), // Regular
+            activate_ignoring_other_apps: true,
+        }
+    }
+}
+
+/// Corresponds to `NSApplicationActivationPolicy`.
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum ActivationPolicy {
+    /// Corresponds to `NSApplicationActivationPolicyRegular`.
+    #[default]
+    Regular,
+    /// Corresponds to `NSApplicationActivationPolicyAccessory`.
+    Accessory,
+    /// Corresponds to `NSApplicationActivationPolicyProhibited`.
+    Prohibited,
 }
diff --git a/winit/src/application.rs b/winit/src/application.rs
index 7fe880ec75..3554ccd16c 100644
--- a/winit/src/application.rs
+++ b/winit/src/application.rs
@@ -25,6 +25,7 @@ use futures::channel::mpsc;
 
 use std::mem::ManuallyDrop;
 use std::sync::Arc;
+use winit::event_loop::EventLoop;
 use iced_runtime::command::Action;
 use winit::monitor::MonitorHandle;
 
@@ -116,9 +117,31 @@ where
     let mut debug = Debug::new();
     debug.startup_started();
 
-    let event_loop = EventLoopBuilder::with_user_event()
+    let mut event_loop_builder = EventLoopBuilder::with_user_event();
+
+    #[cfg(target_os = "macos")]
+    let event_loop_builder = {
+        use winit::platform::macos::{ActivationPolicy, EventLoopBuilderExtMacOS};
+
+        let macos_settings = settings.window.platform_specific;
+
+        let activation_policy = match macos_settings.activation_policy {
+            window::settings::ActivationPolicy::Regular => ActivationPolicy::Regular,
+            window::settings::ActivationPolicy::Accessory => ActivationPolicy::Accessory,
+            window::settings::ActivationPolicy::Prohibited => ActivationPolicy::Prohibited
+        };
+
+        let activate_ignoring_other_apps = macos_settings.activate_ignoring_other_apps;
+
+        event_loop_builder
+            .with_activation_policy(activation_policy)
+            .with_activate_ignoring_other_apps(activate_ignoring_other_apps)
+    };
+
+    let event_loop = event_loop_builder
         .build()
         .expect("Create event loop");
+
     let proxy = event_loop.create_proxy();
 
     let runtime = {