67 lines
1.8 KiB
Markdown
67 lines
1.8 KiB
Markdown
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---
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title: UE5 Lyra学习笔记(6)—CommonUI
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date: 2024-03-22 15:03:59
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excerpt:
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tags:
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rating: ⭐
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---
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# 前言
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- 全局管理类
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- [[#UGameUIManagerSubsystem]]
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- [[#UGameUIPolicy]]
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- UPrimaryGameLayout
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- Widgets
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使用[[#GameplayAbility]]检测玩家输入并且开启UI。
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# UGameUIManagerSubsystem
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父类为：UGameInstanceSubsystem，主要的功能是管理CurrentPolicy(UGameUIPolicy)。
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# UGameUIPolicy
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# GameplayAbility
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Lyra使用2个位于Plugins/ShooterCore/Content/Input/Abilites/
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- GAB_ShowWidget_WhenInputPressed
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- GAB_ShowWidget_WhileInputHeld
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GAB_ShowWidget_WhenInputPressed：![[GAB_ShowWidget_WhenInputPressed.png|800]]
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GAB_ShowWidget_WhileInputHeld，略微复杂一些会多一些：![[GAB_ShowWidget_WhileInputHeld.png|1200]]
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## GameplayTasks
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- UCancellableAsyncAction
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- [[#UAsyncAction_PushContentToLayerForPlayer]]
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核心函数逻辑如下，主要调用UPrimaryGameLayout::PushWidgetToLayerStackAsync()
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```c++
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void UAsyncAction_PushContentToLayerForPlayer::Activate()
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{
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if (UPrimaryGameLayout* RootLayout = UPrimaryGameLayout::GetPrimaryGameLayout(OwningPlayerPtr.Get()))
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{
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TWeakObjectPtr<UAsyncAction_PushContentToLayerForPlayer> WeakThis = this;
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StreamingHandle = RootLayout->PushWidgetToLayerStackAsync<UCommonActivatableWidget>(LayerName, bSuspendInputUntilComplete, WidgetClass, [this, WeakThis](EAsyncWidgetLayerState State, UCommonActivatableWidget* Widget) {
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if (WeakThis.IsValid())
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{
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switch (State)
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{
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case EAsyncWidgetLayerState::Initialize:
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BeforePush.Broadcast(Widget);
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break;
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case EAsyncWidgetLayerState::AfterPush:
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AfterPush.Broadcast(Widget);
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SetReadyToDestroy();
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break;
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case EAsyncWidgetLayerState::Canceled:
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SetReadyToDestroy();
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break;
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}
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}
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SetReadyToDestroy();
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});
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}
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else
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{
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SetReadyToDestroy();
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}
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}
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```
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