Send current keyboard state when entering a surface

include/wlr/types/wlr_keyboard.h

@@ -28,6 +28,8 @@ enum wlr_keyboard_modifier {
 	WLR_MODIFIER_MOD5 = 128,
 };
 
+#define WLR_KEYBOARD_KEYS_CAP 32
+
 struct wlr_keyboard_impl;
 
 struct wlr_keyboard {
@@ -41,6 +43,7 @@ struct wlr_keyboard {
 	xkb_led_index_t led_indexes[WLR_LED_COUNT];
 	xkb_mod_index_t mod_indexes[WLR_MODIFIER_COUNT];
 
+	uint32_t keycodes[WLR_KEYBOARD_KEYS_CAP];
 	struct {
 		xkb_mod_mask_t depressed;
 		xkb_mod_mask_t latched;

types/wlr_keyboard.c

@@ -45,6 +45,30 @@ static void keyboard_modifier_update(struct wlr_keyboard *keyboard) {
 	wl_signal_emit(&keyboard->events.modifiers, keyboard);
 }
 
+static void keyboard_key_update(struct wlr_keyboard *keyboard,
+		struct wlr_event_keyboard_key *event) {
+	bool found = false;
+	size_t i = 0;
+	for (; i < WLR_KEYBOARD_KEYS_CAP; ++i) {
+		if (keyboard->keycodes[i] == event->keycode) {
+			found = true;
+			break;
+		}
+	}
+
+	if (event->state == WLR_KEY_PRESSED && !found) {
+		for (size_t i = 0; i < WLR_KEYBOARD_KEYS_CAP; ++i) {
+			if (keyboard->keycodes[i] == 0) {
+				keyboard->keycodes[i] = event->keycode;
+				break;
+			}
+		}
+	}
+	if (event->state == WLR_KEY_RELEASED && found) {
+		keyboard->keycodes[i] = 0;
+	}
+}
+
 void wlr_keyboard_notify_modifiers(struct wlr_keyboard *keyboard,
 		uint32_t mods_depressed, uint32_t mods_latched, uint32_t mods_locked,
 		uint32_t group) {
@@ -68,6 +92,7 @@ void wlr_keyboard_notify_key(struct wlr_keyboard *keyboard,
 	}
 	keyboard_led_update(keyboard);
 	keyboard_modifier_update(keyboard);
+	keyboard_key_update(keyboard, event);
 	wl_signal_emit(&keyboard->events.key, event);
 }
 

types/wlr_seat.c

@@ -751,13 +751,26 @@ void wlr_seat_keyboard_enter(struct wlr_seat *wlr_seat,
 
 	// enter the current surface
 	if (client && client->keyboard) {
-		// TODO: read the currently pressed keys out of the active keyboard and
+		struct wlr_keyboard *keyboard = wlr_seat->keyboard_state.keyboard;
-		// put them in this array
+
 		struct wl_array keys;
 		wl_array_init(&keys);
+		size_t n = 0;
+		for (size_t i = 0; i < WLR_KEYBOARD_KEYS_CAP; ++i) {
+			if (keyboard->keycodes[i] != 0) {
+				wl_array_add(&keys, sizeof(uint32_t));
+				((uint32_t *)keys.data)[n] = keyboard->keycodes[i];
+				n++;
+			}
+		}
 		uint32_t serial = wl_display_next_serial(wlr_seat->display);
 		wl_keyboard_send_enter(client->keyboard, serial,
 			surface->resource, &keys);
+		wl_array_release(&keys);
+
+		wlr_seat_keyboard_send_modifiers(wlr_seat,
+			keyboard->modifiers.depressed, keyboard->modifiers.latched,
+			keyboard->modifiers.locked, keyboard->modifiers.group);
 		wlr_seat_client_send_selection(client);
 	}