Add method to get "base" system UI color (macOS/Windows) and system theme change callback.

3 files changed, 33 insertions, 2 deletions

diff --git a/platform/ios/display_server_ios.h b/platform/ios/display_server_ios.h
index 3efd2498d4..6f66783a47 100644
--- a/platform/ios/display_server_ios.h
+++ b/platform/ios/display_server_ios.h
@@ -77,6 +77,8 @@ class DisplayServerIOS : public DisplayServer {
 	Callable input_event_callback;
 	Callable input_text_callback;
 
+	Callable system_theme_changed;
+
 	int virtual_keyboard_height = 0;
 
 	void perform_event(const Ref<InputEvent> &p_event);
@@ -109,6 +111,8 @@ public:
 	void send_window_event(DisplayServer::WindowEvent p_event) const;
 	void _window_callback(const Callable &p_callable, const Variant &p_arg) const;
 
+	void emit_system_theme_changed();
+
 	// MARK: - Input
 
 	// MARK: Touches and Apple Pencil
@@ -145,6 +149,7 @@ public:
 
 	virtual bool is_dark_mode_supported() const override;
 	virtual bool is_dark_mode() const override;
+	virtual void set_system_theme_change_callback(const Callable &p_callable) override;
 
 	virtual Rect2i get_display_safe_area() const override;
 
@@ -159,8 +164,7 @@ public:
 
 	virtual Vector<DisplayServer::WindowID> get_window_list() const override;
 
-	virtual WindowID
-	get_window_at_screen_position(const Point2i &p_position) const override;
+	virtual WindowID get_window_at_screen_position(const Point2i &p_position) const override;
 
 	virtual int64_t window_get_native_handle(HandleType p_handle_type, WindowID p_window = MAIN_WINDOW_ID) const override;
 
diff --git a/platform/ios/display_server_ios.mm b/platform/ios/display_server_ios.mm
index 2895dffdfa..ed69b91fdd 100644
--- a/platform/ios/display_server_ios.mm
+++ b/platform/ios/display_server_ios.mm
@@ -387,6 +387,16 @@ bool DisplayServerIOS::is_dark_mode() const {
 	}
 }
 
+void DisplayServerIOS::set_system_theme_change_callback(const Callable &p_callable) {
+	system_theme_changed = p_callable;
+}
+
+void DisplayServerIOS::emit_system_theme_changed() {
+	if (system_theme_changed.is_valid()) {
+		system_theme_changed.call();
+	}
+}
+
 Rect2i DisplayServerIOS::get_display_safe_area() const {
 	UIEdgeInsets insets = UIEdgeInsetsZero;
 	UIView *view = AppDelegate.viewController.godotView;
diff --git a/platform/ios/godot_view.mm b/platform/ios/godot_view.mm
index ff8a4f8921..4b87863fc5 100644
--- a/platform/ios/godot_view.mm
+++ b/platform/ios/godot_view.mm
@@ -167,6 +167,23 @@ static const float earth_gravity = 9.80665;
 	}
 }
 
+- (void)system_theme_changed {
+	DisplayServerIOS *ds = (DisplayServerIOS *)DisplayServer::get_singleton();
+	if (ds) {
+		ds->emit_system_theme_changed();
+	}
+}
+
+- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
+	if (@available(iOS 13.0, *)) {
+		[super traitCollectionDidChange:previousTraitCollection];
+
+		if ([UITraitCollection currentTraitCollection].userInterfaceStyle != previousTraitCollection.userInterfaceStyle) {
+			[self system_theme_changed];
+		}
+	}
+}
+
 - (void)stopRendering {
 	if (!self.isActive) {
 		return;