目錄
- 前言
- 1 創建
- 2 加載
- 3 Deactivate
- 4 總結與圖示
前言
這篇主要將視角放在Experience的流程，所以不會涉及一些更深的東西
之后ULyraExperienceManagerComponent簡稱為EMC
1 創建
完事開頭難，首先找到了管理Experience的組件，那么它的初始化位置在哪？
其作為ALyraGameState的成員，在構造函數中用CreateDefaultSubobject創建。
//LyraGameState.h
private:// Handles loading and managing the current gameplay experienceUPROPERTY()TObjectPtr<ULyraExperienceManagerComponent>ExperienceManagerComponent;//LyraGameState.cpp
ALyraGameState::ALyraGameState(const FObjectInitializer& ObjectInitializer): Super(ObjectInitializer)
{...ExperienceManagerComponent = CreateDefaultSubobject<ULyraExperienceManagerComponent>(TEXT("ExperienceManagerComponent"));...
}
2 加載
結合EMC中的這個枚舉梳理，初始為Unloaded：
//LyraExperienceManagerComponent.h
ELyraExperienceLoadState LoadState = ELyraExperienceLoadState::Unloaded;
//其定義
enum class ELyraExperienceLoadState
{Unloaded,Loading,LoadingGameFeatures,LoadingChaosTestingDelay,ExecutingActions,Loaded,Deactivating
};
結合之前的地圖加載流程分析，加載的流程開始于ULyraExperienceManagerComponent::SetCurrentExperience->
ULyraExperienceManagerComponent::StartExperienceLoad中LoadState轉為Loading->
ULyraExperienceManagerComponent::OnExperienceLoadComplete中收集完所有的GameFeaturesToEnable后，LoadState 轉為LoadingGameFeatures->
對于每個GF，執行ULyraExperienceManager::NotifyOfPluginActivation和UGameFeaturesSubsystem::Get().LoadAndActivateGameFeaturePlugin->
先忽略測試用狀態LoadingChaosTestingDelay
ULyraExperienceManagerComponent::OnExperienceFullLoadCompleted中狀態轉為ExecutingActions并開始執行Actions，執行順序為Experience本身Acitons中的每一個Action、遍歷ActionSets，每一個ActionSets的Actions的每一個Action，對于單個Action，順序執行OnGameFeatureRegistering()、OnGameFeatureLoading()、OnGameFeatureActivating(Context)->
Action執行完成后，狀態進入Loaded，然后分別是OnExperienceLoaded三個優先級的多播
3 Deactivate
EndPlay觸發DeActive->
DeActive涉及的GameFeature->
狀態轉為Deactivating->
同理按順序觸發每個Action的OnGameFeatureDeactivating、OnGameFeatureUnregistering()->
狀態轉為Unloaded ，CurrentExperience = nullptr;
4 總結與圖示
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