config: add fallback output mode

jay-config/src/_private/client.rs

@@ -15,8 +15,9 @@ use {
         client::{Client, ClientCapabilities, ClientCriterion, ClientMatcher, MatchedClient},
         exec::Command,
         input::{
-            FocusFollowsMouseMode, InputDevice, LayerDirection, Seat, SwitchEvent, Timeline,
-            acceleration::AccelProfile, capability::Capability, clickmethod::ClickMethod,
+            FallbackOutputMode, FocusFollowsMouseMode, InputDevice, LayerDirection, Seat,
+            SwitchEvent, Timeline, acceleration::AccelProfile, capability::Capability,
+            clickmethod::ClickMethod,
         },
         keyboard::{
             Group, Keymap,
@@ -1364,6 +1365,10 @@ impl ConfigClient {
         self.send(&ClientMessage::SetFocusFollowsMouseMode { seat, mode })
     }
 
+    pub fn set_fallback_output_mode(&self, seat: Seat, mode: FallbackOutputMode) {
+        self.send(&ClientMessage::SetFallbackOutputMode { seat, mode })
+    }
+
     pub fn set_window_management_enabled(&self, seat: Seat, enabled: bool) {
         self.send(&ClientMessage::SetWindowManagementEnabled { seat, enabled })
     }

jay-config/src/_private/ipc.rs

@@ -4,8 +4,9 @@ use {
         Axis, Direction, PciId, Workspace,
         client::{Client, ClientCapabilities, ClientMatcher},
         input::{
-            FocusFollowsMouseMode, InputDevice, LayerDirection, Seat, SwitchEvent, Timeline,
-            acceleration::AccelProfile, capability::Capability, clickmethod::ClickMethod,
+            FallbackOutputMode, FocusFollowsMouseMode, InputDevice, LayerDirection, Seat,
+            SwitchEvent, Timeline, acceleration::AccelProfile, capability::Capability,
+            clickmethod::ClickMethod,
         },
         keyboard::{Group, Keymap, mods::Modifiers, syms::KeySym},
         logging::LogLevel,
@@ -826,6 +827,10 @@ pub enum ClientMessage<'a> {
         groups: Option<Vec<Group<'a>>>,
         options: Option<Vec<&'a str>>,
     },
+    SetFallbackOutputMode {
+        seat: Seat,
+        mode: FallbackOutputMode,
+    },
 }
 
 #[derive(Serialize, Deserialize, Debug)]

jay-config/src/input.rs

@@ -503,6 +503,13 @@ impl Seat {
         get!().set_focus_follows_mouse_mode(self, mode);
     }
 
+    /// Sets the fallback output mode.
+    ///
+    /// The default is `Cursor`.
+    pub fn set_fallback_output_mode(self, mode: FallbackOutputMode) {
+        get!().set_fallback_output_mode(self, mode);
+    }
+
     /// Enables or disable window management mode.
     ///
     /// In window management mode, floating windows can be moved by pressing the left
@@ -650,6 +657,19 @@ pub enum FocusFollowsMouseMode {
     False,
 }
 
+/// Defines which output is used when no particular output is specified.
+///
+/// This configures where to place a newly opened window or workspace, what window to focus when a
+/// window is closed, which workspace is moved with [`Seat::move_to_output`], and similar actions.
+#[derive(Serialize, Deserialize, Copy, Clone, Debug, Hash, Eq, PartialEq)]
+#[non_exhaustive]
+pub enum FallbackOutputMode {
+    /// Use the output the cursor is on.
+    Cursor,
+    /// Use the output the focus is on (highlighted window).
+    Focus,
+}
+
 /// Returns all seats.
 pub fn get_seats() -> Vec<Seat> {
     get!().seats()