Refactor app launching (#174)

- Refactor the way apps work: Instead of a C interface, they are now C++ classes. The main reasoning is that attaching data to an app was cumbersome. Having different implementations for different kinds of apps was cumbersome too. (3 or 4 layers of manifest nesting for the TactilityC project)
- External apps are still written in C, but they get a createData/destroyData in their manifest, so:
- External apps now have their own manifest.
- All functions in the original AppManifest are removed and replaced by a single `createApp` function
- External apps now automatically register (each app individually!) when they run the first time. As a side-effect they become visible in the `AppList` app!
- Adapted all apps for the new interface.
- Adapted all internal logic for these changes (Gui, ViewPort, Loader, AppContext, AppInstance, etc.)
- Rewrote parts of Loader to use std::shared_ptr to make the code much safer.
- Added a refcount check for the `AppInstance` and `App` at the end of their lifecycle. Show warning if refcount is too high.

TactilityC/Source/tt_app_manifest.cpp

@@ -1,105 +1,29 @@
 #include "tt_app_manifest.h"
 
 #include <Check.h>
-#include <Log.h>
 #include <app/ElfApp.h>
+#include <app/AppCompatC.h>
 
 #define TAG "tt_app"
 
-AppOnStart elfOnStart = nullptr;
-AppOnStop elfOnStop = nullptr;
-AppOnShow elfOnShow = nullptr;
-AppOnHide elfOnHide = nullptr;
-AppOnResult elfOnResult = nullptr;
-
-static void onStartWrapper(tt::app::AppContext& context) {
-    if (elfOnStart != nullptr) {
-        TT_LOG_I(TAG, "onStartWrapper");
-        elfOnStart(&context);
-    } else {
-        TT_LOG_W(TAG, "onStartWrapper not set");
-    }
-}
-
-static void onStopWrapper(tt::app::AppContext& context) {
-    if (elfOnStop != nullptr) {
-        TT_LOG_I(TAG, "onStopWrapper");
-        elfOnStop(&context);
-    } else {
-        TT_LOG_W(TAG, "onStopWrapper not set");
-    }
-}
-
-static void onShowWrapper(tt::app::AppContext& context, lv_obj_t* parent) {
-    if (elfOnShow != nullptr) {
-        TT_LOG_I(TAG, "onShowWrapper");
-        elfOnShow(&context, parent);
-    } else {
-        TT_LOG_W(TAG, "onShowWrapper not set");
-    }
-}
-
-static void onHideWrapper(tt::app::AppContext& context) {
-    if (elfOnHide != nullptr) {
-        TT_LOG_I(TAG, "onHideWrapper");
-        elfOnHide(&context);
-    } else {
-        TT_LOG_W(TAG, "onHideWrapper not set");
-    }
-}
-
-static void onResultWrapper(tt::app::AppContext& context, tt::app::Result result, const tt::Bundle& resultData) {
-    if (elfOnResult != nullptr) {
-        TT_LOG_I(TAG, "onResultWrapper");
-        Result convertedResult = AppResultError;
-        switch (result) {
-            case tt::app::ResultOk:
-                convertedResult = AppResultOk;
-                break;
-            case tt::app::ResultCancelled:
-                convertedResult = AppResultCancelled;
-                break;
-            case tt::app::ResultError:
-                convertedResult = AppResultError;
-                break;
-        }
-        elfOnResult(&context, convertedResult, (BundleHandle)&resultData);
-    } else {
-        TT_LOG_W(TAG, "onResultWrapper not set");
-    }
-}
-
-tt::app::AppManifest manifest = {
-    .id = "ElfWrapperInTactilityC",
-    .name = "",
-    .icon = "",
-    .onStart = onStartWrapper,
-    .onStop = onStopWrapper,
-    .onShow = onShowWrapper,
-    .onHide = onHideWrapper,
-    .onResult = onResultWrapper
-};
-
 extern "C" {
 
-void tt_set_app_manifest(
-    const char* name,
-    const char* _Nullable icon,
-    AppOnStart onStart,
-    AppOnStop _Nullable onStop,
-    AppOnShow _Nullable onShow,
-    AppOnHide _Nullable onHide,
-    AppOnResult _Nullable onResult
+void tt_app_register(
+    const ExternalAppManifest* manifest
 ) {
 #ifdef ESP_PLATFORM
-    manifest.name = name;
-    manifest.icon = icon ? icon : "";
-    elfOnStart = onStart;
-    elfOnStop = onStop;
-    elfOnShow = onShow;
-    elfOnHide = onHide;
-    elfOnResult = onResult;
-    tt::app::setElfAppManifest(manifest);
+    tt_assert((manifest->createData == nullptr) == (manifest->destroyData == nullptr));
+    tt::app::setElfAppManifest(
+        manifest->name,
+        manifest->icon,
+        (tt::app::CreateData)manifest->createData,
+        (tt::app::DestroyData)manifest->destroyData,
+        (tt::app::OnStart)manifest->onStart,
+        (tt::app::OnStop)manifest->onStop,
+        (tt::app::OnShow)manifest->onShow,
+        (tt::app::OnHide)manifest->onHide,
+        (tt::app::OnResult)manifest->onResult
+    );
 #else
     tt_crash("TactilityC is intended for PC/Simulator");
 #endif