Add support for wlr_keyboard_group

A wlr_keyboard_group allows for multiple keyboard devices to be
combined into one logical keyboard. This is useful for keyboards that
are split into multiple input devices despite appearing as one physical
keyboard in the user's mind.

This adds support for wlr_keyboard_groups to sway. There are two
keyboard groupings currently supported, which can be set on a per-seat
basis. The first keyboard grouping is none, which disables all grouping
and provides no functional change. The second is keymap, which groups
the keyboard devices in the seat by their keymap. With this grouping,
the effective layout and repeat info is also synced across keyboard
devices in the seat. Device specific bindings will still be executed as
normal, but everything else related to key and modifier events will be
handled by the keyboard group's keyboard.

4 files changed, 17 insertions, 0 deletions

diff --git a/include/sway/commands.h b/include/sway/commands.h
index 45b5b0f4..67665d87 100644
--- a/include/sway/commands.h
+++ b/include/sway/commands.h
@@ -284,6 +284,7 @@ sway_cmd seat_cmd_attach;
 sway_cmd seat_cmd_cursor;
 sway_cmd seat_cmd_fallback;
 sway_cmd seat_cmd_hide_cursor;
+sway_cmd seat_cmd_keyboard_grouping;
 sway_cmd seat_cmd_pointer_constraint;
 sway_cmd seat_cmd_xcursor_theme;
 
diff --git a/include/sway/config.h b/include/sway/config.h
index 457e0a98..ed542790 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -176,6 +176,12 @@ enum seat_config_allow_constrain {
         CONSTRAIN_DISABLE
 };
 
+enum seat_keyboard_grouping {
+        KEYBOARD_GROUP_DEFAULT,  // the default is currently keymap
+        KEYBOARD_GROUP_NONE,
+        KEYBOARD_GROUP_KEYMAP
+};
+
 /**
  * Options for multiseat and other misc device configurations
  */
@@ -185,6 +191,7 @@ struct seat_config {
         list_t *attachments; // list of seat_attachment configs
         int hide_cursor_timeout;
         enum seat_config_allow_constrain allow_constrain;
+        enum seat_keyboard_grouping keyboard_grouping;
         struct {
                 char *name;
                 int size;
diff --git a/include/sway/input/keyboard.h b/include/sway/input/keyboard.h
index 4aa0d8f4..72a29ba6 100644
--- a/include/sway/input/keyboard.h
+++ b/include/sway/input/keyboard.h
@@ -67,6 +67,14 @@ struct sway_keyboard {
         struct sway_binding *repeat_binding;
 };
 
+struct sway_keyboard_group {
+        struct wlr_keyboard_group *wlr_group;
+        struct sway_seat_device *seat_device;
+        struct wl_listener keyboard_key;
+        struct wl_listener keyboard_modifiers;
+        struct wl_list link; // sway_seat::keyboard_groups
+};
+
 struct xkb_keymap *sway_keyboard_compile_keymap(struct input_config *ic,
                 char **error);
 
diff --git a/include/sway/input/seat.h b/include/sway/input/seat.h
index 24a6fed4..32795b03 100644
--- a/include/sway/input/seat.h
+++ b/include/sway/input/seat.h
@@ -90,6 +90,7 @@ struct sway_seat {
         struct wl_listener request_set_primary_selection;
 
         struct wl_list devices; // sway_seat_device::link
+        struct wl_list keyboard_groups; // sway_keyboard_group::link
 
         struct wl_list link; // input_manager::seats
 };