Implement some crazy-ass logic to keep last watched text vertically centered (until it no longer makes sense to)

src/c/main.c

@@ -3,7 +3,7 @@
 #include <stdio.h>
 #include <string.h>
 
-// #define DEBUG_MODE 1
+#define DEBUG_MODE 2
 
 // declare settings-derived statics
 static uint8_t s_is_jellyfin;
@@ -31,6 +31,11 @@ static const uint8_t s_sleep_bar_drop = 49;
 #else
 static const uint8_t s_sleep_bar_drop = 31;
 #endif
+#if PBL_DISPLAY_WIDTH >= 200
+#define LW_FONT_SIZE 28
+#else
+#define LW_FONT_SIZE 24
+#endif
 
 // declare animation statics
 static GRect s_sleep_bar_start = GRect(0, 0, PBL_DISPLAY_WIDTH, PBL_DISPLAY_HEIGHT);
@@ -41,6 +46,33 @@ static time_t s_sleep_timestamp;
 static bool s_sleep_session_found;
 static bool s_sleep_data_accessible;
 
+static const uint8_t s_wasted_top_text_pixels = 10; // 10 blank pixels above each line of text
+static const uint8_t s_margin = PBL_DISPLAY_WIDTH / 35;
+static const uint16_t s_available_height = PBL_DISPLAY_HEIGHT - s_sleep_bar_drop - s_margin + s_wasted_top_text_pixels;
+// static const uint8_t s_max_rows = s_available_height / LW_FONT_SIZE;
+static const uint16_t s_screen_center_y = PBL_DISPLAY_HEIGHT / 2;
+static const uint16_t s_base_shift = s_screen_center_y - (LW_FONT_SIZE / 2) - (s_wasted_top_text_pixels / 2); // base - perfect if there is one row
+static void write_last_watched(const char *text) {
+	text_layer_set_text(s_last_watched_layer, text);
+
+	GSize text_size = text_layer_get_content_size(s_last_watched_layer);
+	uint8_t current_rows = text_size.h / LW_FONT_SIZE;
+
+	// for each additional row beyond 1, shift up by half a row's height
+	uint16_t y = s_base_shift - ((current_rows - 1) * (LW_FONT_SIZE / 2));
+
+	// if the top extends above the sleep bar, force it below it
+	if (y < s_sleep_bar_drop) {
+		y = s_sleep_bar_drop - s_wasted_top_text_pixels + s_margin;
+	}
+
+	layer_set_frame(text_layer_get_layer(s_last_watched_layer), GRect(PBL_IF_ROUND_ELSE(s_icon_width, 0) + s_margin,
+	                                                                  y,
+	                                                                  PBL_DISPLAY_WIDTH - (PBL_IF_ROUND_ELSE(s_icon_width * 2, s_icon_width) + (s_margin) * 2),
+	                                                                  s_available_height));
+	// APP_LOG(APP_LOG_LEVEL_DEBUG, "height=%d rows=%d/%d", text_size.h, current_rows, s_max_rows);
+}
+
 static bool cb_update_sleep_time(HealthActivity activity, time_t start_time, time_t end_time, void *context) {
 	s_sleep_timestamp = start_time;
 	return false;
@@ -116,8 +148,7 @@ static void main_window_load(Window *window) {
 	layer_set_update_proc(s_pin_icon_layer, pin_icon_update_proc);
 	pin_animation_init(s_pin_icon_layer);
 
-	static const uint8_t side_margin = PBL_DISPLAY_WIDTH / 35;
+	s_last_watched_layer = text_layer_create(GRect(0, 0, 0, 0)); // placeholder, updated when layer is written to
-	s_last_watched_layer = text_layer_create(GRect(PBL_IF_ROUND_ELSE(s_icon_width, 0) + side_margin, s_sleep_bar_drop, PBL_DISPLAY_WIDTH - (PBL_IF_ROUND_ELSE(s_icon_width * 2, s_icon_width) + side_margin * 2), PBL_DISPLAY_HEIGHT - s_sleep_bar_drop));
 #if PBL_DISPLAY_WIDTH >= 200
 	s_sleep_time_layer = text_layer_create(GRect(0, PBL_IF_ROUND_ELSE(21, -2), PBL_DISPLAY_WIDTH, 30));
 	text_layer_set_font(s_sleep_time_layer, fonts_get_system_font(FONT_KEY_GOTHIC_24_BOLD));
@@ -157,9 +188,9 @@ static void main_window_load(Window *window) {
 	text_layer_set_text_color(s_last_watched_layer, GColorWhite);
 
 	if (s_sleep_data_accessible) {
-		text_layer_set_text(s_last_watched_layer, "N/A"); // default - will be updated before display
+		write_last_watched("N/A"); // default - will be updated before display
 	} else {
-		text_layer_set_text(s_last_watched_layer, "Sleep data inaccessible!\nEnsure Pebble Health is enabled.");
+		write_last_watched("Sleep data inaccessible!\nEnsure Pebble Health is enabled.");
 	}
 
 	// add layers as children to windows
@@ -197,7 +228,7 @@ static void send_sleep_time_to_pkjs() {
 	DictionaryIterator *out;
 	AppMessageResult result = app_message_outbox_begin(&out);
 	if (result != APP_MSG_OK) {
-		text_layer_set_text(s_last_watched_layer, "outbox_begin failure");
+		write_last_watched("outbox_begin failure");
 		return;
 	}
 	if (s_sleep_session_found) {
@@ -208,7 +239,7 @@ static void send_sleep_time_to_pkjs() {
 	}
 	result = app_message_outbox_send();
 	if (result != APP_MSG_OK) {
-		text_layer_set_text(s_last_watched_layer, "outbox_send failure");
+		write_last_watched("outbox_send failure");
 		return;
 	}
 }
@@ -217,7 +248,7 @@ static void send_pin_to_pkjs() {
 	DictionaryIterator *out;
 	AppMessageResult result = app_message_outbox_begin(&out);
 	if (result != APP_MSG_OK) {
-		text_layer_set_text(s_last_watched_layer, "outbox_begin failure");
+		write_last_watched("outbox_begin failure");
 		return;
 	}
 	if (s_sleep_session_found) {
@@ -228,7 +259,7 @@ static void send_pin_to_pkjs() {
 	dict_write_cstring(out, MESSAGE_KEY_PKJS_PIN_TITLE, text_layer_get_text(s_last_watched_layer));
 	result = app_message_outbox_send();
 	if (result != APP_MSG_OK) {
-		text_layer_set_text(s_last_watched_layer, "outbox_send failure");
+		write_last_watched("outbox_send failure");
 		return;
 	}
 }
@@ -295,7 +326,7 @@ static void inbox_received_handler(DictionaryIterator *iter, void *context) {
 
 	Tuple *watched_tuple = dict_find(iter, MESSAGE_KEY_PKJS_LAST_WATCHED);
 	if (watched_tuple) {
-		text_layer_set_text(s_last_watched_layer, watched_tuple->value->cstring);
+		write_last_watched(watched_tuple->value->cstring);
 		PropertyAnimation *sleep_bar_prop = property_animation_create_layer_frame(s_sleep_bar_layer, &s_sleep_bar_start, &GRect(0, -PBL_DISPLAY_HEIGHT + s_sleep_bar_drop, PBL_DISPLAY_WIDTH, PBL_DISPLAY_HEIGHT));
 		Animation *sleep_bar_anim = property_animation_get_animation(sleep_bar_prop);
 		animation_set_duration(sleep_bar_anim, 512);