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.

1 files changed, 8 insertions, 0 deletions

diff --git a/platform/x11/os_x11.cpp b/platform/x11/os_x11.cpp
index 54d3759cc5..d4b7538fc8 100644
--- a/platform/x11/os_x11.cpp
+++ b/platform/x11/os_x11.cpp
@@ -1689,6 +1689,10 @@ bool OS_X11::is_window_always_on_top() const {
 	return current_videomode.always_on_top;
 }
 
+bool OS_X11::is_window_focused() const {
+	return window_focused;
+}
+
 void OS_X11::set_borderless_window(bool p_borderless) {
 
 	if (get_borderless_window() == p_borderless)
@@ -2281,6 +2285,8 @@ void OS_X11::process_xevents() {
 				minimized = false;
 				window_has_focus = true;
 				main_loop->notification(MainLoop::NOTIFICATION_WM_FOCUS_IN);
+				window_focused = true;
+
 				if (mouse_mode_grab) {
 					// Show and update the cursor if confined and the window regained focus.
 					if (mouse_mode == MOUSE_MODE_CONFINED)
@@ -2308,6 +2314,7 @@ void OS_X11::process_xevents() {
 				window_has_focus = false;
 				input->release_pressed_events();
 				main_loop->notification(MainLoop::NOTIFICATION_WM_FOCUS_OUT);
+				window_focused = false;
 
 				if (mouse_mode_grab) {
 					//dear X11, I try, I really try, but you never work, you do whathever you want.
@@ -3502,6 +3509,7 @@ OS_X11::OS_X11() {
 	xi.last_relative_time = 0;
 	layered_window = false;
 	minimized = false;
+	window_focused = true;
 	xim_style = 0L;
 	mouse_mode = MOUSE_MODE_VISIBLE;
 }