Hi all 
I’ve developed a gtk-3 / gtk-rs application called Zoha, and I’m trying to port it to macOS. The selling point of this app is that with a click of a button, a drop-down terminal appears, just like Tilda, no matter which space the user is in right now (space in macOS == desktops in GNOME).
To do that I use the gdk_quartz_window_get_nswindow(&GdkWindow) call to get the native window implementation and apply NSWindowCollectionBehaviorMoveToActiveSpace behavior on it. This behavior works in a plain objective-c macOS application, but in GTK application it has no effect.
Does anybody experienced with macOS know what I’m doing wrong?
I also tried my luck with chatGPT and it says I have to set the behaivor early on the window, before it is painted on the screen. The problem is until I call application_window.show_all(), there’s no GdkWindow assigned to the ApplicationWindow instance.
Here is my Rust code:
#[cfg(target_os = "macos")]
pub fn macos_hack(window: &gdk::Window) {
unsafe {
let win = gdk_quartz_window_get_nswindow(window.to_glib_none().0) as id;
eprintln!("WIN ID: {:?}", win);
// Neither of these masks work. *I know* they are set on the native window instance,
// since if I sent an invalid mask according to apple docs, say 1 | 1<<6 | 1<<8, it prints
// the corresponding error: invalid mask for window and panics.
// let mask: u32 = 1 << 0; // NSWindowCollectionBehaviorCanJoinAllSpaces
let mask: u32 = 1 << 1; // NSWindowCollectionBehaviorMoveToActiveSpace
let _: () = msg_send![win, setCollectionBehavior:mask];
// Blind shot, trying to see if it would make any difference. It didn't.
// let mask: u32 = 1 << 1;
// let mask: u32 = 1 << 1 | 1 << 3;
// eprintln!("STYLE MASK: {}", mask);
// let _: () = msg_send![win, setStyleMask:mask];
if mask > 0 {
let _: () = msg_send![win, orderFrontRegardless];
}
};
}
#[cfg(target_os = "macos")]
extern "C" {
fn gdk_quartz_window_get_nswindow(window: *mut GdkWindow) -> *mut c_void;
}