Add focus to my single window

src/Seat.zig

@@ -8,12 +8,15 @@ context: *Context,
 
 seat_v1: *river.SeatV1,
 
+hovered: ?*Window,
+
 link: wl.list.Link,
 
 pub fn init(seat: *Seat, context: *Context, river_seat_v1: *river.SeatV1) void {
     seat.* = .{
         .context = context,
         .seat_v1 = river_seat_v1,
+        .hovered = null,
         .link = undefined, // Handled by the wl.list
     };
 
@@ -23,8 +26,17 @@ pub fn init(seat: *Seat, context: *Context, river_seat_v1: *river.SeatV1) void {
 fn seatListener(river_seat_v1: *river.SeatV1, event: river.SeatV1.Event, seat: *Seat) void {
     assert(seat.seat_v1 == river_seat_v1);
     switch (event) {
-        .wl_seat => |ev| {
-            log.debug("initializing new river_ouput_v1 corresponding to wl_seat: {d}", .{ev.name});
+        .removed => {
+            river_seat_v1.destroy();
+            seat.context.allocator.destroy(seat);
+        },
+        .wl_seat => {
+            // log.debug("initializing new river_seat_v1 corresponding to wl_seat: {d}", .{ev.name});
+        },
+        .pointer_enter => |ev| {
+            const window_v1 = ev.window orelse return;
+            const window: *Window = @ptrCast(@alignCast(window_v1.getUserData()));
+            seat.hovered = window;
         },
         else => |ev| {
             log.debug("unhandled event: {s}", .{@tagName(ev)});
@@ -32,6 +44,17 @@ fn seatListener(river_seat_v1: *river.SeatV1, event: river.SeatV1.Event, seat: *
     }
 }
 
+pub fn manage(seat: *Seat) void {
+    if (seat.hovered) |window| {
+        seat.seat_v1.focusWindow(window.window_v1);
+        seat.hovered = null;
+    }
+}
+
+pub fn render(seat: *Seat) void {
+    _ = seat;
+}
+
 const std = @import("std");
 const assert = std.debug.assert;
 
@@ -40,5 +63,6 @@ const wl = wayland.client.wl;
 const river = wayland.client.river;
 
 const Context = @import("main.zig").Context;
+const Window = @import("Window.zig");
 
 const log = std.log.scoped(.Seat);