Implement key repeat for pressed key bindings

Each sway_keyboard is provided with a wayland timer event source.
When a valid keypress binding has been found, a callback to
handle_keyboard_repeat is set. Any key event will either clear
the callback or (if the new key event is a valid keypress binding)
delay the callback again.

1 files changed, 38 insertions, 0 deletions

diff --git a/sway/input/keyboard.c b/sway/input/keyboard.c
index 8dc8239c..be000fb9 100644
--- a/sway/input/keyboard.c
+++ b/sway/input/keyboard.c
@@ -264,6 +264,7 @@ static void handle_keyboard_key(struct wl_listener *listener, void *data) {
         }
 
         // Identify and execute active pressed binding
+        struct sway_binding *next_repeat_binding = NULL;
         if (event->state == WLR_KEY_PRESSED) {
                 struct sway_binding *binding_pressed = NULL;
                 get_active_binding(&keyboard->state_keycodes,
@@ -279,6 +280,21 @@ static void handle_keyboard_key(struct wl_listener *listener, void *data) {
                 if (binding_pressed) {
                         seat_execute_command(seat, binding_pressed);
                         handled = true;
+                        next_repeat_binding = binding_pressed;
+                }
+        }
+
+        // Set up (or clear) keyboard repeat for a pressed binding
+        if (next_repeat_binding) {
+                keyboard->repeat_binding = next_repeat_binding;
+                if (wl_event_source_timer_update(keyboard->key_repeat_source,
+                                keyboard->key_repeat_initial_delay) < 0) {
+                        wlr_log(WLR_DEBUG, "failed to set key repeat timer");
+                }
+        } else if (keyboard->repeat_binding) {
+                keyboard->repeat_binding = NULL;
+                if (wl_event_source_timer_update(keyboard->key_repeat_source, 0) < 0) {
+                        wlr_log(WLR_DEBUG, "failed to disarm key repeat timer");
                 }
         }
 
@@ -303,6 +319,22 @@ static void handle_keyboard_key(struct wl_listener *listener, void *data) {
         transaction_commit_dirty();
 }
 
+static int handle_keyboard_repeat(void *data) {
+        struct sway_keyboard *keyboard = (struct sway_keyboard *)data;
+        if (keyboard->repeat_binding) {
+                // We queue the next event first, as the command might cancel it
+                if (wl_event_source_timer_update(keyboard->key_repeat_source,
+                                keyboard->key_repeat_step_delay) < 0) {
+                        wlr_log(WLR_DEBUG, "failed to update key repeat timer");
+                }
+
+                seat_execute_command(keyboard->seat_device->sway_seat,
+                                keyboard->repeat_binding);
+                transaction_commit_dirty();
+        }
+        return 0;
+}
+
 static void handle_keyboard_modifiers(struct wl_listener *listener,
                 void *data) {
         struct sway_keyboard *keyboard =
@@ -328,6 +360,11 @@ struct sway_keyboard *sway_keyboard_create(struct sway_seat *seat,
         wl_list_init(&keyboard->keyboard_key.link);
         wl_list_init(&keyboard->keyboard_modifiers.link);
 
+        keyboard->key_repeat_source = wl_event_loop_add_timer(server.wl_event_loop,
+                        handle_keyboard_repeat, keyboard);
+        keyboard->key_repeat_initial_delay = 660;
+        keyboard->key_repeat_step_delay = 40;
+
         return keyboard;
 }
 
@@ -441,5 +478,6 @@ void sway_keyboard_destroy(struct sway_keyboard *keyboard) {
         }
         wl_list_remove(&keyboard->keyboard_key.link);
         wl_list_remove(&keyboard->keyboard_modifiers.link);
+        wl_event_source_remove(keyboard->key_repeat_source);
         free(keyboard);
 }