inherit monitor from parent for transient windows

1 files changed, 20 insertions, 0 deletions

diff --git a/src/clients/hints.rs b/src/clients/hints.rs
index bd3ef76..f59794a 100644
--- a/src/clients/hints.rs
+++ b/src/clients/hints.rs
@@ -102,3 +102,23 @@ impl Ewm {
         }
     }
 }
+
+/// Gets the `WM_TRANSIENT_FOR` hint set on a window
+pub fn transient_for(conn: &Connection, window: Window) -> Option<Window> {
+    let hints = conn
+        .wait_for_reply(conn.send_request(&GetProperty {
+            window,
+            delete: false,
+            property: x::ATOM_WM_TRANSIENT_FOR,
+            r#type: x::ATOM_WINDOW,
+            long_offset: 0,
+            long_length: 1,
+        }))
+        .ok()?;
+
+    if hints.r#type() != x::ATOM_WINDOW || hints.length() < 1 || hints.format() != 32 {
+        return None;
+    }
+
+    Some(hints.value::<Window>()[0])
+}