set fullscreen based on ewm hints

1 files changed, 21 insertions, 0 deletions

diff --git a/src/clients/hints.rs b/src/clients/hints.rs
index fdfbead..39003d2 100644
--- a/src/clients/hints.rs
+++ b/src/clients/hints.rs
@@ -235,3 +235,24 @@ pub fn is_dialog(conn: &Connection, window: Window) -> bool {
         && hints.format() == 32
         && hints.value::<Atom>()[0] == conn.atoms.net_wm_window_type_dialog
 }
+
+/// Check if the given window wants to be fullscreen, using the `NET_WM_STATE` property
+pub fn is_fullscreen(conn: &Connection, window: Window) -> bool {
+    let Ok(hints) = conn.wait_for_reply(conn.send_request(&GetProperty {
+        window,
+        delete: false,
+        property: conn.atoms.net_wm_state,
+        r#type: x::ATOM_ATOM,
+        long_offset: 0,
+        long_length: 9999,
+    })) else {
+        return false;
+    };
+
+    hints.r#type() == x::ATOM_ATOM
+        && hints.format() == 32
+        && hints
+            .value::<Atom>()
+            .iter()
+            .any(|a| *a == conn.atoms.net_wm_fullscreen)
+}