Preallocate blocks for tiled multi-screen menus (requires C++17)

8 files changed, 75 insertions, 64 deletions

diff --git a/src/displayapp/screens/ApplicationList.cpp b/src/displayapp/screens/ApplicationList.cpp
index 5284433..0de5b54 100644
--- a/src/displayapp/screens/ApplicationList.cpp
+++ b/src/displayapp/screens/ApplicationList.cpp
@@ -6,7 +6,6 @@
 
 using namespace Pinetime::Applications::Screens;
 
-constexpr std::array<Tile::Applications, ApplicationList::applications.size()> ApplicationList::applications;
 
 auto ApplicationList::CreateScreenList() const {
   std::array<std::function<std::unique_ptr<Screen>()>, nScreens> screens;
@@ -38,11 +37,6 @@ bool ApplicationList::OnTouchEvent(Pinetime::Applications::TouchEvents event) {
 }
 
 std::unique_ptr<Screen> ApplicationList::CreateScreen(unsigned int screenNum) const {
-  std::array<Tile::Applications, appsPerScreen> apps;
-  for (int i = 0; i < appsPerScreen; i++) {
-    apps[i] = applications[screenNum * appsPerScreen + i];
-  }
-
-  return std::make_unique<Screens::Tile>(screenNum, nScreens, app, settingsController, batteryController, dateTimeController, apps);
+  return std::make_unique<Screens::Tile>(screenNum, nScreens, app, settingsController, batteryController, dateTimeController, applications[screenNum]);
 }
 
diff --git a/src/displayapp/screens/ApplicationList.h b/src/displayapp/screens/ApplicationList.h
index dfd9119..d2ede1b 100644
--- a/src/displayapp/screens/ApplicationList.h
+++ b/src/displayapp/screens/ApplicationList.h
@@ -31,29 +31,39 @@ namespace Pinetime {
         Controllers::DateTime& dateTimeController;
 
         static constexpr int appsPerScreen = 6;
-        static constexpr std::array<Tile::Applications, appsPerScreen * 3> applications {{
-          {Symbols::stopWatch, Apps::StopWatch},
-          {Symbols::clock, Apps::Alarm},
-          {Symbols::hourGlass, Apps::Timer},
-          {Symbols::shoe, Apps::Steps},
-          {Symbols::heartBeat, Apps::HeartRate},
-          {Symbols::music, Apps::Music},
-
-          {Symbols::paintbrush, Apps::Paint},
-          {Symbols::paddle, Apps::Paddle},
-          {"2", Apps::Twos},
-          {Symbols::chartLine, Apps::Motion},
-          {Symbols::drum, Apps::Metronome},
-          {Symbols::map, Apps::Navigation},
-
-          {Symbols::drum, Apps::Jumpscore},
-          {Symbols::none, Apps::None},
-          {Symbols::none, Apps::None},
-          {Symbols::none, Apps::None},
-          {Symbols::none, Apps::None},
-          {Symbols::none, Apps::None},
-        }};
-        static constexpr int nScreens = (applications.size() + appsPerScreen - 1) / appsPerScreen;
+        static constexpr auto applications{[]() constexpr{
+          constexpr Tile::Applications list[] = {
+            {Symbols::stopWatch, Apps::StopWatch},
+            {Symbols::clock, Apps::Alarm},
+            {Symbols::hourGlass, Apps::Timer},
+            {Symbols::shoe, Apps::Steps},
+            {Symbols::heartBeat, Apps::HeartRate},
+            {Symbols::music, Apps::Music},
+
+            {Symbols::paintbrush, Apps::Paint},
+            {Symbols::paddle, Apps::Paddle},
+            {"2", Apps::Twos},
+            {Symbols::chartLine, Apps::Motion},
+            {Symbols::drum, Apps::Metronome},
+            {Symbols::map, Apps::Navigation},
+
+            {Symbols::drum, Apps::Jumpscore},
+          };
+          std::array<std::array<Tile::Applications, appsPerScreen>, ((std::size(list) + appsPerScreen - 1) / appsPerScreen)> r{};;
+          int idx = 0;
+          for (auto& f : r) {
+            for (auto& e : f) {
+              if (idx < std::size(list)) {
+                e = list[idx];
+              } else {
+                e = { Symbols::none, Apps::None };
+              }
+              idx++;
+            }
+          }
+          return r;
+        }()};
+        static constexpr auto nScreens = std::size(applications);
         ScreenList<nScreens> screens;
       };
     }
diff --git a/src/displayapp/screens/List.cpp b/src/displayapp/screens/List.cpp
index 0bc7da8..333605f 100644
--- a/src/displayapp/screens/List.cpp
+++ b/src/displayapp/screens/List.cpp
@@ -15,7 +15,7 @@ List::List(uint8_t screenID,
            uint8_t numScreens,
            DisplayApp* app,
            Controllers::Settings& settingsController,
-           std::array<Applications, MAXLISTITEMS>& applications)
+           const std::array<Applications, MAXLISTITEMS>& applications)
   : Screen(app), settingsController {settingsController} {
 
   // Set the background to Black
diff --git a/src/displayapp/screens/List.h b/src/displayapp/screens/List.h
index 88ef28e..d3f10a5 100644
--- a/src/displayapp/screens/List.h
+++ b/src/displayapp/screens/List.h
@@ -24,7 +24,7 @@ namespace Pinetime {
                       uint8_t numScreens,
                       DisplayApp* app,
                       Controllers::Settings& settingsController,
-                      std::array<Applications, MAXLISTITEMS>& applications);
+                      const std::array<Applications, MAXLISTITEMS>& applications);
         ~List() override;
 
         void OnButtonEvent(lv_obj_t* object, lv_event_t event);
diff --git a/src/displayapp/screens/Tile.cpp b/src/displayapp/screens/Tile.cpp
index cce1d2e..eb07f2b 100644
--- a/src/displayapp/screens/Tile.cpp
+++ b/src/displayapp/screens/Tile.cpp
@@ -28,7 +28,7 @@ Tile::Tile(uint8_t screenID,
            Controllers::Settings& settingsController,
            Pinetime::Controllers::Battery& batteryController,
            Controllers::DateTime& dateTimeController,
-           std::array<Applications, 6>& applications)
+           const std::array<Applications, 6>& applications)
   : Screen(app), batteryController {batteryController}, dateTimeController {dateTimeController} {
 
   settingsController.SetAppMenu(screenID);
diff --git a/src/displayapp/screens/Tile.h b/src/displayapp/screens/Tile.h
index 4874714..ae85dea 100644
--- a/src/displayapp/screens/Tile.h
+++ b/src/displayapp/screens/Tile.h
@@ -27,7 +27,7 @@ namespace Pinetime {
                       Controllers::Settings& settingsController,
                       Pinetime::Controllers::Battery& batteryController,
                       Controllers::DateTime& dateTimeController,
-                      std::array<Applications, 6>& applications);
+                      const std::array<Applications, 6>& applications);
 
         ~Tile() override;
 
diff --git a/src/displayapp/screens/settings/Settings.cpp b/src/displayapp/screens/settings/Settings.cpp
index 1c964c4..c3fbb4f 100644
--- a/src/displayapp/screens/settings/Settings.cpp
+++ b/src/displayapp/screens/settings/Settings.cpp
@@ -6,8 +6,6 @@
 
 using namespace Pinetime::Applications::Screens;
 
-constexpr std::array<List::Applications, Settings::entries.size()> Settings::entries;
-
 auto Settings::CreateScreenList() const {
   std::array<std::function<std::unique_ptr<Screen>()>, nScreens> screens;
   for (size_t i = 0; i < screens.size(); i++) {
@@ -33,10 +31,5 @@ bool Settings::OnTouchEvent(Pinetime::Applications::TouchEvents event) {
 }
 
 std::unique_ptr<Screen> Settings::CreateScreen(unsigned int screenNum) const {
-  std::array<List::Applications, entriesPerScreen> screens;
-  for (int i = 0; i < entriesPerScreen; i++) {
-    screens[i] = entries[screenNum * entriesPerScreen + i];
-  }
-
-  return std::make_unique<Screens::List>(screenNum, nScreens, app, settingsController, screens);
+  return std::make_unique<Screens::List>(screenNum, nScreens, app, settingsController, entries[screenNum]);
 }
diff --git a/src/displayapp/screens/settings/Settings.h b/src/displayapp/screens/settings/Settings.h
index ad4bf08..96c9e4e 100644
--- a/src/displayapp/screens/settings/Settings.h
+++ b/src/displayapp/screens/settings/Settings.h
@@ -25,28 +25,42 @@ namespace Pinetime {
         Controllers::Settings& settingsController;
 
         static constexpr int entriesPerScreen = 4;
-        static constexpr std::array<List::Applications, entriesPerScreen * 4> entries {{
-          {Symbols::sun, "Display", Apps::SettingDisplay},
-          {Symbols::eye, "Wake Up", Apps::SettingWakeUp},
-          {Symbols::clock, "Time format", Apps::SettingTimeFormat},
-          {Symbols::home, "Watch face", Apps::SettingWatchFace},
-
-          {Symbols::shoe, "Steps", Apps::SettingSteps},
-          {Symbols::clock, "Set date", Apps::SettingSetDate},
-          {Symbols::clock, "Set time", Apps::SettingSetTime},
-          {Symbols::batteryHalf, "Battery", Apps::BatteryInfo},
-
-          {Symbols::clock, "Chimes", Apps::SettingChimes},
-          {Symbols::tachometer, "Shake Calib.", Apps::SettingShakeThreshold},
-          {Symbols::check, "Firmware", Apps::FirmwareValidation},
-          {Symbols::bluetooth, "Bluetooth", Apps::SettingBluetooth},
-
-          {Symbols::list, "About", Apps::SysInfo},
-          {Symbols::none, "None", Apps::None},
-          {Symbols::none, "None", Apps::None},
-          {Symbols::none, "None", Apps::None},
-        }};
-        static constexpr int nScreens = (entries.size() + entriesPerScreen - 1) / entriesPerScreen;
+        static constexpr auto entries{[]() constexpr{
+          using namespace Pinetime::Applications::Screens;
+          using namespace Pinetime::Applications;
+          constexpr List::Applications list[] = {
+            {Symbols::sun, "Display", Apps::SettingDisplay},
+            {Symbols::eye, "Wake Up", Apps::SettingWakeUp},
+            {Symbols::clock, "Time format", Apps::SettingTimeFormat},
+            {Symbols::home, "Watch face", Apps::SettingWatchFace},
+
+            {Symbols::shoe, "Steps", Apps::SettingSteps},
+            {Symbols::clock, "Set date", Apps::SettingSetDate},
+            {Symbols::clock, "Set time", Apps::SettingSetTime},
+            {Symbols::batteryHalf, "Battery", Apps::BatteryInfo},
+
+            {Symbols::clock, "Chimes", Apps::SettingChimes},
+            {Symbols::tachometer, "Shake Calib.", Apps::SettingShakeThreshold},
+            {Symbols::check, "Firmware", Apps::FirmwareValidation},
+            {Symbols::bluetooth, "Bluetooth", Apps::SettingBluetooth},
+
+            {Symbols::list, "About", Apps::SysInfo},
+          };
+          std::array<std::array<List::Applications, entriesPerScreen>, ((std::size(list) + entriesPerScreen - 1) / entriesPerScreen)> r{};;
+          int idx = 0;
+          for (auto& f : r) {
+            for (auto& e : f) {
+              if (idx < std::size(list)) {
+                e = list[idx];
+              } else {
+                e = { Symbols::none, "",  Apps::None };
+              }
+              idx++;
+            }
+          }
+          return r;
+        }()};
+        static constexpr auto nScreens = std::size(entries);
         ScreenList<nScreens> screens;
       };
     }