config: make focus-follows-mouse optional

jay-config/src/_private/client.rs

@@ -10,7 +10,10 @@ use {
             logging, Config, ConfigEntry, ConfigEntryGen, PollableId, WireMode, VERSION,
         },
         exec::Command,
-        input::{acceleration::AccelProfile, capability::Capability, InputDevice, Seat},
+        input::{
+            acceleration::AccelProfile, capability::Capability, FocusFollowsMouseMode, InputDevice,
+            Seat,
+        },
         keyboard::{
             mods::{Modifiers, RELEASE},
             syms::KeySym,
@@ -924,6 +927,10 @@ impl Client {
         self.send(&ClientMessage::SetForward { seat, forward })
     }
 
+    pub fn set_focus_follows_mouse_mode(&self, seat: Seat, mode: FocusFollowsMouseMode) {
+        self.send(&ClientMessage::SetFocusFollowsMouseMode { seat, mode })
+    }
+
     pub fn parse_keymap(&self, keymap: &str) -> Keymap {
         let res = self.send_with_response(&ClientMessage::ParseKeymap { keymap });
         get_response!(res, Keymap(0), ParseKeymap { keymap });

jay-config/src/_private/ipc.rs

@@ -1,6 +1,9 @@
 use {
     crate::{
-        input::{acceleration::AccelProfile, capability::Capability, InputDevice, Seat},
+        input::{
+            acceleration::AccelProfile, capability::Capability, FocusFollowsMouseMode, InputDevice,
+            Seat,
+        },
         keyboard::{mods::Modifiers, syms::KeySym, Keymap},
         logging::LogLevel,
         theme::{colors::Colorable, sized::Resizable, Color},
@@ -464,6 +467,10 @@ pub enum ClientMessage<'a> {
         mod_mask: Modifiers,
         sym: KeySym,
     },
+    SetFocusFollowsMouseMode {
+        seat: Seat,
+        mode: FocusFollowsMouseMode,
+    },
 }
 
 #[derive(Serialize, Deserialize, Debug)]

jay-config/src/input.rs

@@ -390,6 +390,21 @@ impl Seat {
     pub fn consume(self) {
         self.set_forward(false)
     }
+
+    /// Sets the focus-follows-mouse mode.
+    pub fn set_focus_follows_mouse_mode(self, mode: FocusFollowsMouseMode) {
+        get!().set_focus_follows_mouse_mode(self, mode);
+    }
+}
+
+/// A focus-follows-mouse mode.
+#[derive(Serialize, Deserialize, Copy, Clone, Debug, Hash, Eq, PartialEq)]
+pub enum FocusFollowsMouseMode {
+    /// When the mouse moves and enters a toplevel, that toplevel gets the keyboard focus.
+    True,
+    /// The keyboard focus changes only when clicking on a window or the previously
+    /// focused window becomes invisible.
+    False,
 }
 
 /// Returns all seats.