Add an `OS.is_window_focused()` getter

This makes it possible to know whether the window is focused
at a given time, without having to track the focus state manually
using `NOTIFICATION_WM_FOCUS_IN` and `NOTIFICATION_WM_FOCUS_OUT`.

This partially addresses #33928.

2 files changed, 15 insertions, 5 deletions

diff --git a/platform/osx/os_osx.h b/platform/osx/os_osx.h
index a61b9234d1..61fa7ef27c 100644
--- a/platform/osx/os_osx.h
+++ b/platform/osx/os_osx.h
@@ -124,6 +124,7 @@ public:
 	bool maximized;
 	bool zoomed;
 	bool resizable;
+	bool window_focused;
 
 	Size2 window_size;
 	Rect2 restore_rect;
@@ -277,6 +278,7 @@ public:
 	virtual bool is_window_maximized() const;
 	virtual void set_window_always_on_top(bool p_enabled);
 	virtual bool is_window_always_on_top() const;
+	virtual bool is_window_focused() const;
 	virtual void request_attention();
 	virtual String get_joy_guid(int p_device) const;
 
diff --git a/platform/osx/os_osx.mm b/platform/osx/os_osx.mm
index dac6721fb4..17836e9f94 100644
--- a/platform/osx/os_osx.mm
+++ b/platform/osx/os_osx.mm
@@ -397,9 +397,6 @@ static Vector2 get_mouse_pos(NSPoint locationInWindow, CGFloat backingScaleFacto
 }
 
 - (void)windowDidBecomeKey:(NSNotification *)notification {
-	//_GodotInputWindowFocus(window, GL_TRUE);
-	//_GodotPlatformSetCursorMode(window, window->cursorMode);
-
 	if (OS_OSX::singleton->get_main_loop()) {
 		get_mouse_pos(
 				[OS_OSX::singleton->window_object mouseLocationOutsideOfEventStream],
@@ -408,25 +405,31 @@ static Vector2 get_mouse_pos(NSPoint locationInWindow, CGFloat backingScaleFacto
 
 		OS_OSX::singleton->get_main_loop()->notification(MainLoop::NOTIFICATION_WM_FOCUS_IN);
 	}
+
+	OS_OSX::singleton->window_focused = true;
 }
 
 - (void)windowDidResignKey:(NSNotification *)notification {
-	//_GodotInputWindowFocus(window, GL_FALSE);
-	//_GodotPlatformSetCursorMode(window, Godot_CURSOR_NORMAL);
 	if (OS_OSX::singleton->get_main_loop())
 		OS_OSX::singleton->get_main_loop()->notification(MainLoop::NOTIFICATION_WM_FOCUS_OUT);
+
+	OS_OSX::singleton->window_focused = false;
 }
 
 - (void)windowDidMiniaturize:(NSNotification *)notification {
 	OS_OSX::singleton->wm_minimized(true);
 	if (OS_OSX::singleton->get_main_loop())
 		OS_OSX::singleton->get_main_loop()->notification(MainLoop::NOTIFICATION_WM_FOCUS_OUT);
+
+	OS_OSX::singleton->window_focused = false;
 };
 
 - (void)windowDidDeminiaturize:(NSNotification *)notification {
 	OS_OSX::singleton->wm_minimized(false);
 	if (OS_OSX::singleton->get_main_loop())
 		OS_OSX::singleton->get_main_loop()->notification(MainLoop::NOTIFICATION_WM_FOCUS_IN);
+
+	OS_OSX::singleton->window_focused = true;
 };
 
 @end
@@ -2618,6 +2621,10 @@ bool OS_OSX::is_window_always_on_top() const {
 	return [window_object level] == NSFloatingWindowLevel;
 }
 
+bool OS_OSX::is_window_focused() const {
+	return window_focused;
+}
+
 void OS_OSX::request_attention() {
 
 	[NSApp requestUserAttention:NSCriticalRequest];
@@ -3070,6 +3077,7 @@ OS_OSX::OS_OSX() {
 	window_size = Vector2(1024, 600);
 	zoomed = false;
 	resizable = false;
+	window_focused = true;
 
 	Vector<Logger *> loggers;
 	loggers.push_back(memnew(OSXTerminalLogger));