Hide window from taskbar

src/main.rs

@@ -6,6 +6,8 @@ use winit::event::{
     WindowEvent::{CloseRequested, ReceivedCharacter},
 };
 use winit::event_loop::{ControlFlow, EventLoop};
+use winit::platform::unix::x11::util::WindowType;
+use winit::platform::unix::{WindowBuilderExtUnix, WindowExtUnix, XWindowType};
 use winit::window::{Window, WindowBuilder};
 
 use self::core::roftl::Roftl;
@@ -40,9 +42,40 @@ fn main() -> Result<(), Box<dyn Error>> {
     let window = WindowBuilder::new()
         .with_decorations(false)
         .with_transparent(true)
+        .with_title("roftl")
+        .with_visible(true)
+        .with_always_on_top(true)
         .build(&event_loop)
         .expect("Could not create window");
 
+    debug! {"Hide window from taskbar"}
+    let screen = window
+        .xlib_screen_id()
+        .expect("Could not get screen id of window");
+
+    let xcb_conn = unsafe {
+        xcb::Connection::from_raw_conn(
+            window.xcb_connection().unwrap() as *mut xcb::ffi::xcb_connection_t
+        )
+    };
+
+    let ewmh_conn = xcb_util::ewmh::Connection::connect(xcb_conn)
+        .map_err(|(e, _)| e)
+        .unwrap();
+
+    let xcb_window: xcb::xproto::Window =
+        window.xlib_window().expect("Cannot get xlib window") as u32;
+
+    xcb_util::ewmh::request_change_wm_state(
+        &ewmh_conn,
+        screen,
+        xcb_window,
+        xcb_util::ewmh::STATE_ADD,
+        ewmh_conn.WM_STATE(),
+        ewmh_conn.WM_STATE_SKIP_TASKBAR(),
+        xcb_util::ewmh::CLIENT_SOURCE_TYPE_NORMAL,
+    );
+
     debug! {"Window id: {:?}", window.id()}
 
     debug! {"Draw primary state to window"}