weather: Colorize forecast temperatures

Author: vkareh

src/displayapp/screens/Weather.cpp

@@ -8,6 +8,19 @@
 
 using namespace Pinetime::Applications::Screens;
 
+namespace {
+  uint8_t temperatureStyle(int16_t temperature) {
+    if (temperature <= 0) { // freezing
+      return LV_TABLE_PART_CELL3;
+    } else if (temperature <= 400) { // ice danger
+      return LV_TABLE_PART_CELL4;
+    } else if (temperature >= 2700) { // hot
+      return LV_TABLE_PART_CELL6;
+    }
+    return LV_TABLE_PART_CELL5;
+  }
+}
+
 Weather::Weather(Controllers::Settings& settingsController, Controllers::SimpleWeatherService& weatherService)
   : settingsController {settingsController}, weatherService {weatherService} {
 
@@ -54,6 +67,19 @@ Weather::Weather(Controllers::Settings& settingsController, Controllers::SimpleW
   lv_obj_set_style_local_text_color(forecast, LV_TABLE_PART_CELL2, LV_STATE_DEFAULT, LV_COLOR_WHITE);
   lv_obj_set_style_local_text_font(forecast, LV_TABLE_PART_CELL2, LV_STATE_DEFAULT, &fontawesome_weathericons);
 
+  // LV_TABLE_PART_CELL3: Freezing
+  lv_obj_set_style_local_border_color(forecast, LV_TABLE_PART_CELL3, LV_STATE_DEFAULT, LV_COLOR_BLACK);
+  lv_obj_set_style_local_text_color(forecast, LV_TABLE_PART_CELL3, LV_STATE_DEFAULT, Colors::blue);
+  // LV_TABLE_PART_CELL4: Ice
+  lv_obj_set_style_local_border_color(forecast, LV_TABLE_PART_CELL4, LV_STATE_DEFAULT, LV_COLOR_BLACK);
+  lv_obj_set_style_local_text_color(forecast, LV_TABLE_PART_CELL4, LV_STATE_DEFAULT, LV_COLOR_CYAN);
+  // LV_TABLE_PART_CELL5: Normal
+  lv_obj_set_style_local_border_color(forecast, LV_TABLE_PART_CELL5, LV_STATE_DEFAULT, LV_COLOR_BLACK);
+  lv_obj_set_style_local_text_color(forecast, LV_TABLE_PART_CELL5, LV_STATE_DEFAULT, Colors::orange);
+  // LV_TABLE_PART_CELL6: Hot
+  lv_obj_set_style_local_border_color(forecast, LV_TABLE_PART_CELL6, LV_STATE_DEFAULT, LV_COLOR_BLACK);
+  lv_obj_set_style_local_text_color(forecast, LV_TABLE_PART_CELL6, LV_STATE_DEFAULT, Colors::deepOrange);
+
   lv_obj_align(forecast, nullptr, LV_ALIGN_IN_BOTTOM_LEFT, 0, 0);
 
   for (int i = 0; i < Controllers::SimpleWeatherService::MaxNbForecastDays; i++) {
@@ -124,6 +150,8 @@ void Weather::Refresh() {
       for (int i = 0; i < Controllers::SimpleWeatherService::MaxNbForecastDays; i++) {
         int16_t maxTemp = optCurrentForecast->days[i].maxTemperature;
         int16_t minTemp = optCurrentForecast->days[i].minTemperature;
+        uint8_t maxStyle = temperatureStyle(maxTemp);
+        uint8_t minStyle = temperatureStyle(minTemp);
         if (settingsController.GetWeatherFormat() == Controllers::Settings::WeatherFormat::Imperial) {
           maxTemp = Controllers::SimpleWeatherService::CelsiusToFahrenheit(maxTemp);
           minTemp = Controllers::SimpleWeatherService::CelsiusToFahrenheit(minTemp);
@@ -137,7 +165,9 @@ void Weather::Refresh() {
         lv_table_set_cell_value(forecast, 0, i, WeekDays[wday]);
         lv_table_set_cell_value(forecast, 1, i, Symbols::GetSymbol(optCurrentForecast->days[i].iconId));
         lv_table_set_cell_value_fmt(forecast, 2, i, "%d", maxTemp);
+        lv_table_set_cell_type(forecast, 2, i, maxStyle);
         lv_table_set_cell_value_fmt(forecast, 3, i, "%d", minTemp);
+        lv_table_set_cell_type(forecast, 3, i, minStyle);
       }
     } else {
       for (int i = 0; i < Controllers::SimpleWeatherService::MaxNbForecastDays; i++) {

src/libs/lv_conf.h

@@ -729,7 +729,9 @@ typedef void* lv_obj_user_data_t;
 #define LV_USE_TABLE    1
 #if LV_USE_TABLE
 #define LV_TABLE_COL_MAX    12
-#define LV_TABLE_CELL_STYLE_CNT 5
+#define LV_TABLE_CELL_STYLE_CNT 6
+#define LV_TABLE_PART_CELL5 5
+#define LV_TABLE_PART_CELL6 6
 #endif