1 files changed, 71 insertions, 0 deletions
diff --git a/src/seat.zig b/src/seat.zig
new file mode 100644
index 0000000..7ec9b07
--- /dev/null
+++ b/src/seat.zig
@@ -0,0 +1,71 @@
+const std = @import("std");
+const c = @import("c.zig").c;
+
+// TODO: InputManager and multi-seat support
+pub const Seat = struct {
+    server: *Server,
+
+    wlr_seat: *c.wlr_seat,
+    listen_new_input: c.wl_listener,
+
+    // Multiple mice are handled by the same Cursor
+    cursor: Cursor,
+    // Mulitple keyboards are handled separately
+    keyboards: std.ArrayList(Keyboard),
+
+    pub fn init(server: *Server, allocator: *std.mem.Allocator) @This() {
+        var seat = @This(){
+            .server = server,
+            // This seems to be the default seat name used by compositors
+            .wlr_seat = c.wlr_seat_create(server.*.wl_display, "seat0"),
+            .cursor = undefined,
+            .keyboards = std.ArrayList(Keyboard).init(allocator),
+
+            .listen_new_input = c.wl_listener{
+                .link = undefined,
+                .notify = handle_new_input,
+            },
+        };
+
+        seat.cursor = cursor.Cursor.init(server);
+
+        // Set up handler for all new input devices made available. This
+        // includes keyboards, pointers, touch, etc.
+        c.wl_signal_add(&server.*.backend.*.events.new_input, &seat.new_input);
+    }
+
+    fn add_keyboard(self: *@This(), device: *c.wlr_input_device) void {
+        self.keyboards.append(Keyboard.init(self, device));
+        c.wlr_seat_set_keyboard(self, device);
+    }
+
+    fn add_pointer(self: *@This(), device: *c.struct_wlr_input_device) void {
+        // We don't do anything special with pointers. All of our pointer handling
+        // is proxied through wlr_cursor. On another compositor, you might take this
+        // opportunity to do libinput configuration on the device to set
+        // acceleration, etc.
+        c.wlr_cursor_attach_input_device(self.cursor.wlr_cursor, device);
+    }
+
+    fn handle_new_input(listener: [*c]c.wl_listener, data: ?*c_void) callconv(.C) void {
+        // This event is raised by the backend when a new input device becomes available.
+        var seat = @fieldParentPtr(Seat, "listen_new_input", listener);
+        var device = @ptrCast(*c.wlr_input_device, @alignCast(@alignOf(*c.wlr_input_device), data));
+
+        switch (device.*.type) {
+            .WLR_INPUT_DEVICE_KEYBOARD => seat.add_keyboard(device),
+            .WLR_INPUT_DEVICE_POINTER => seat.add_pointer(device),
+            else => {},
+        }
+
+        // We need to let the wlr_seat know what our capabilities are, which is
+        // communiciated to the client. In TinyWL we always have a cursor, even if
+        // there are no pointer devices, so we always include that capability.
+        var caps: u32 = @intCast(u32, c.WL_SEAT_CAPABILITY_POINTER);
+        // if list not empty
+        if (c.wl_list_empty(&server.*.keyboards) == 0) {
+            caps |= @intCast(u32, c.WL_SEAT_CAPABILITY_KEYBOARD);
+        }
+        c.wlr_seat_set_capabilities(server.*.seat, caps);
+    }
+};