Improved the Terminal Watchfaces UI

+ Reorder code to match the widgets order in the UI.

+ Use InfintimeTheme Colors instead of hardcoded hex values

+ Added a new InfinitimeTheme color: gray, using it to turn certain
  values gray when they contain no data

+ Implement @vkareh's [variable battery icon](https://github.com/InfiniTimeOrg/InfiniTime/pull/1964)
  color to the battery percentage text.

+ Replaced the 'You have mail.' notification message with the message
  '[1]+ Notify' to better fit the terminal lore.

src/displayapp/InfiniTimeTheme.h

@@ -8,6 +8,7 @@ namespace Colors {
   static constexpr lv_color_t green = LV_COLOR_MAKE(0x0, 0xb0, 0x0);
   static constexpr lv_color_t blue = LV_COLOR_MAKE(0x0, 0x50, 0xff);
   static constexpr lv_color_t lightGray = LV_COLOR_MAKE(0xb0, 0xb0, 0xb0);
+  static constexpr lv_color_t gray = LV_COLOR_MAKE(0x50, 0x50, 0x50);
 
   static constexpr lv_color_t bg = LV_COLOR_MAKE(0x5d, 0x69, 0x7e);
   static constexpr lv_color_t bgAlt = LV_COLOR_MAKE(0x38, 0x38, 0x38);

src/displayapp/screens/WatchFaceTerminal.cpp

@@ -2,13 +2,13 @@
 #include "displayapp/screens/WatchFaceTerminal.h"
 #include "displayapp/screens/BatteryIcon.h"
 #include "displayapp/screens/NotificationIcon.h"
-#include "displayapp/screens/Symbols.h"
 #include "components/battery/BatteryController.h"
 #include "components/ble/BleController.h"
 #include "components/ble/NotificationManager.h"
 #include "components/heartrate/HeartRateController.h"
 #include "components/motion/MotionController.h"
 #include "components/settings/Settings.h"
+#include "displayapp/InfiniTimeTheme.h"
 
 using namespace Pinetime::Applications::Screens;
 
@@ -27,40 +27,44 @@ WatchFaceTerminal::WatchFaceTerminal(Controllers::DateTime& dateTimeController,
     settingsController {settingsController},
     heartRateController {heartRateController},
     motionController {motionController} {
-  batteryValue = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_recolor(batteryValue, true);
-  lv_obj_align(batteryValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -20);
-
-  connectState = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_recolor(connectState, true);
-  lv_obj_align(connectState, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 40);
 
   notificationIcon = lv_label_create(lv_scr_act(), nullptr);
-  lv_obj_align(notificationIcon, nullptr, LV_ALIGN_IN_LEFT_MID, 0, -100);
+  lv_obj_align(notificationIcon, nullptr, LV_ALIGN_IN_LEFT_MID, 0, -90);
-
-  label_date = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_recolor(label_date, true);
-  lv_obj_align(label_date, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -40);
 
   label_prompt_1 = lv_label_create(lv_scr_act(), nullptr);
-  lv_obj_align(label_prompt_1, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -80);
+  lv_obj_set_style_local_text_color(label_prompt_1, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::lightGray);
+  lv_obj_align(label_prompt_1, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -70);
   lv_label_set_text_static(label_prompt_1, "user@watch:~ $ now");
 
-  label_prompt_2 = lv_label_create(lv_scr_act(), nullptr);
-  lv_obj_align(label_prompt_2, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 60);
-  lv_label_set_text_static(label_prompt_2, "user@watch:~ $");
-
   label_time = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_recolor(label_time, true);
-  lv_obj_align(label_time, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -60);
+  lv_obj_align(label_time, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -50);
 
-  heartbeatValue = lv_label_create(lv_scr_act(), nullptr);
+  label_date = lv_label_create(lv_scr_act(), nullptr);
-  lv_label_set_recolor(heartbeatValue, true);
+  lv_label_set_recolor(label_date, true);
-  lv_obj_align(heartbeatValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 20);
+  lv_obj_align(label_date, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -30);
+
+  batteryValue = lv_label_create(lv_scr_act(), nullptr);
+  lv_label_set_recolor(batteryValue, true);
+  lv_obj_align(batteryValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, -10);
 
   stepValue = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_recolor(stepValue, true);
-  lv_obj_align(stepValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 0);
+  lv_obj_set_style_local_text_color(stepValue, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::orange);
+  lv_obj_align(stepValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 10);
+
+  heartbeatValue = lv_label_create(lv_scr_act(), nullptr);
+  lv_label_set_recolor(heartbeatValue, true);
+  lv_obj_align(heartbeatValue, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 30);
+
+  connectState = lv_label_create(lv_scr_act(), nullptr);
+  lv_label_set_recolor(connectState, true);
+  lv_obj_align(connectState, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 50);
+
+  label_prompt_2 = lv_label_create(lv_scr_act(), nullptr);
+  lv_obj_set_style_local_text_color(label_prompt_2, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::lightGray);
+  lv_obj_align(label_prompt_2, lv_scr_act(), LV_ALIGN_IN_LEFT_MID, 0, 70);
+  lv_label_set_text_static(label_prompt_2, "user@watch:~ $");
 
   taskRefresh = lv_task_create(RefreshTaskCallback, LV_DISP_DEF_REFR_PERIOD, LV_TASK_PRIO_MID, this);
   Refresh();
@@ -72,33 +76,10 @@ WatchFaceTerminal::~WatchFaceTerminal() {
 }
 
 void WatchFaceTerminal::Refresh() {
-  powerPresent = batteryController.IsPowerPresent();
-  batteryPercentRemaining = batteryController.PercentRemaining();
-  if (batteryPercentRemaining.IsUpdated() || powerPresent.IsUpdated()) {
-    lv_label_set_text_fmt(batteryValue, "[BATT]#387b54 %d%%", batteryPercentRemaining.Get());
-    if (batteryController.IsPowerPresent()) {
-      lv_label_ins_text(batteryValue, LV_LABEL_POS_LAST, " Charging");
-    }
-  }
-
-  bleState = bleController.IsConnected();
-  bleRadioEnabled = bleController.IsRadioEnabled();
-  if (bleState.IsUpdated() || bleRadioEnabled.IsUpdated()) {
-    if (!bleRadioEnabled.Get()) {
-      lv_label_set_text_static(connectState, "[STAT]#0082fc Disabled#");
-    } else {
-      if (bleState.Get()) {
-        lv_label_set_text_static(connectState, "[STAT]#0082fc Connected#");
-      } else {
-        lv_label_set_text_static(connectState, "[STAT]#0082fc Disconnected#");
-      }
-    }
-  }
-
   notificationState = notificationManager.AreNewNotificationsAvailable();
   if (notificationState.IsUpdated()) {
     if (notificationState.Get()) {
-      lv_label_set_text_static(notificationIcon, "You have mail.");
+      lv_label_set_text_static(notificationIcon, "[1]+ Notify");
     } else {
       lv_label_set_text_static(notificationIcon, "");
     }
@@ -120,9 +101,9 @@ void WatchFaceTerminal::Refresh() {
         hour = hour - 12;
         ampmChar[0] = 'P';
       }
-      lv_label_set_text_fmt(label_time, "[TIME]#11cc55 %02d:%02d:%02d %s#", hour, minute, second, ampmChar);
+      lv_label_set_text_fmt(label_time, "#fffff [TIME]# #11cc55 %02d:%02d:%02d %s#", hour, minute, second, ampmChar);
     } else {
-      lv_label_set_text_fmt(label_time, "[TIME]#11cc55 %02d:%02d:%02d", hour, minute, second);
+      lv_label_set_text_fmt(label_time, "#ffffff [TIME]# #11cc55 %02d:%02d:%02d#", hour, minute, second);
     }
 
     currentDate = std::chrono::time_point_cast<std::chrono::days>(currentDateTime.Get());
@@ -130,22 +111,57 @@ void WatchFaceTerminal::Refresh() {
       uint16_t year = dateTimeController.Year();
       Controllers::DateTime::Months month = dateTimeController.Month();
       uint8_t day = dateTimeController.Day();
-      lv_label_set_text_fmt(label_date, "[DATE]#007fff %04d-%02d-%02d#", short(year), char(month), char(day));
+      lv_label_set_text_fmt(label_date, "#ffffff [DATE]# #007fff %04d-%02d-%02d#", short(year), char(month), char(day));
     }
   }
 
+  powerPresent = batteryController.IsPowerPresent();
+  batteryPercentRemaining = batteryController.PercentRemaining();
+  if (batteryPercentRemaining.IsUpdated() || powerPresent.IsUpdated()) {
+    // HSV color model has red at 0° and green at 120°.
+    // We lock satuation and brightness at 100% and traverse the cilinder
+    // between red and green, thus avoiding the darker RGB on medium battery
+    // charges and giving us a much nicer color range.
+    uint8_t hue = batteryPercentRemaining.Get() * 120 / 100;
+    lv_obj_set_style_local_text_color(batteryValue, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, lv_color_hsv_to_rgb(hue, 100, 100));
+    lv_label_set_text_fmt(batteryValue, "#ffffff [BATT]# %d%%", batteryPercentRemaining.Get());
+    if (batteryController.IsCharging()) {
+      lv_label_ins_text(batteryValue, LV_LABEL_POS_LAST, " Charging");
+    }
+  }
+
+  stepCount = motionController.NbSteps();
+  if (stepCount.IsUpdated()) {
+    lv_label_set_text_fmt(stepValue, "#ffffff [STEP]# %lu steps", stepCount.Get());
+  }
+
   heartbeat = heartRateController.HeartRate();
   heartbeatRunning = heartRateController.State() != Controllers::HeartRateController::States::Stopped;
   if (heartbeat.IsUpdated() || heartbeatRunning.IsUpdated()) {
     if (heartbeatRunning.Get()) {
-      lv_label_set_text_fmt(heartbeatValue, "[L_HR]#ee3311 %d bpm#", heartbeat.Get());
+
+      lv_obj_set_style_local_text_color(heartbeatValue, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::deepOrange);
+      lv_label_set_text_fmt(heartbeatValue, "#ffffff [L_HR]# %d bpm", heartbeat.Get());
     } else {
-      lv_label_set_text_static(heartbeatValue, "[L_HR]#ee3311 ---#");
+      lv_label_set_text_static(heartbeatValue, "#ffffff [L_HR]# ---");
+      lv_obj_set_style_local_text_color(heartbeatValue, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::gray);
     }
   }
 
-  stepCount = motionController.NbSteps();
+  bleState = bleController.IsConnected();
-  if (stepCount.IsUpdated()) {
+  bleRadioEnabled = bleController.IsRadioEnabled();
-    lv_label_set_text_fmt(stepValue, "[STEP]#ee3377 %lu steps#", stepCount.Get());
+  if (bleState.IsUpdated() || bleRadioEnabled.IsUpdated()) {
+    if (!bleRadioEnabled.Get()) {
+      lv_label_set_text_static(connectState, "#ffffff [STAT]# Disabled");
+      lv_obj_set_style_local_text_color(connectState, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::gray);
+    } else {
+      if (bleState.Get()) {
+        lv_label_set_text_static(connectState, "#ffffff [STAT]# Connected");
+        lv_obj_set_style_local_text_color(connectState, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::blue);
+      } else {
+        lv_label_set_text_static(connectState, "#ffffff [STAT]# Disconnected");
+        lv_obj_set_style_local_text_color(connectState, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, Colors::gray);
+      }
+    }
   }
 }

src/displayapp/screens/WatchFaceTerminal.h

@@ -47,15 +47,15 @@ namespace Pinetime {
         Utility::DirtyValue<bool> notificationState {};
         Utility::DirtyValue<std::chrono::time_point<std::chrono::system_clock, std::chrono::days>> currentDate;
 
+        lv_obj_t* notificationIcon;
+        lv_obj_t* label_prompt_1;
         lv_obj_t* label_time;
         lv_obj_t* label_date;
-        lv_obj_t* label_prompt_1;
-        lv_obj_t* label_prompt_2;
         lv_obj_t* batteryValue;
-        lv_obj_t* heartbeatValue;
         lv_obj_t* stepValue;
-        lv_obj_t* notificationIcon;
+        lv_obj_t* heartbeatValue;
         lv_obj_t* connectState;
+        lv_obj_t* label_prompt_2;
 
         Controllers::DateTime& dateTimeController;
         const Controllers::Battery& batteryController;