效果展示

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概要

这个例子非常简单，定义了1+3个Common Activatable Widget

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CommonUI_ActivatableWidgets相当于一个容器包含了其它3个Common Activatable Widget ,CommonUI_ActivatableWidgets里没有什么逻辑，窗口弹出/切换的逻辑在CommonUI_BaseLayer里，CommonUI_BaseLayer通过变量引用了另外两个Common Activatable Widget

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Activate和Deactivate

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Activate Widget都干了些什么？

void UCommonActivatableWidget::ActivateWidget()
{if (!bIsActive){InternalProcessActivation();}
}void UCommonActivatableWidget::InternalProcessActivation()
{UE_LOG(LogCommonUI, Verbose, TEXT("[%s] -> Activated"), *GetName());bIsActive = true;NativeOnActivated();
}void UCommonActivatableWidget::NativeOnActivated()
{if (ensureMsgf(bIsActive, TEXT("[%s] has called NativeOnActivated, but isn't actually activated! Never call this directly - call ActivateWidget()"))){if (bSetVisibilityOnActivated){SetVisibility(ActivatedVisibility);UE_LOG(LogCommonUI, Verbose, TEXT("[%s] set visibility to [%s] on activation"), *GetName(), *StaticEnum<ESlateVisibility>()->GetDisplayValueAsText(ActivatedVisibility).ToString());}if (CommonUI::IsEnhancedInputSupportEnabled() && InputMapping){if (const ULocalPlayer* LocalPlayer = GetOwningLocalPlayer()){if (UEnhancedInputLocalPlayerSubsystem* InputSystem = LocalPlayer->GetSubsystem<UEnhancedInputLocalPlayerSubsystem>()){InputSystem->AddMappingContext(InputMapping, InputMappingPriority);}}}BP_OnActivated();OnActivated().Broadcast();BP_OnWidgetActivated.Broadcast();}
}

	UPROPERTY(EditAnywhere, Category = Activation, meta = (InlineEditConditionToggle = "ActivatedVisibility"))bool bSetVisibilityOnActivated = false;

在每个Common Activatable Widget 可以通过Activated Visibility以及Dezctivated Visibility来定义该Common Activatable Widget 被激活/取消激活时的可见性行为

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可见性绑定

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	/*** Visibilities to use for when bound widgets in BindVisibilityToActivation are activated.** @param	OnActivatedVisibility	- Visibility for when bound widgets are active* @param	OnDeactivatedVisibility - Visibility for when bound widgets are not active, not used if this widget has activation / deactivation visibilities* @param	bInAllActive			- True if we should switch to activated visibility only when all bound widgets are active*/void UCommonActivatableWidget::SetBindVisibilities(ESlateVisibility OnActivatedVisibility, ESlateVisibility OnDeactivatedVisibility, bool bInAllActive)
{ActivatedBindVisibility = OnActivatedVisibility;DeactivatedBindVisibility = OnDeactivatedVisibility;bAllActive = bInAllActive;
}/*** Bind our visibility to the activation of another widget, useful for making mouse collisions behave similiar to console navigation w.r.t activation* Will immediately update visibility based on the bound widget activation & visibilites set by SetBindVisibilities.** @param	ActivatableWidget		- The widget whose activation / deactivation will modify our visibility */void UCommonActivatableWidget::BindVisibilityToActivation(UCommonActivatableWidget* ActivatableWidget)
{if (ActivatableWidget && !VisibilityBoundWidgets.Contains(ActivatableWidget)){VisibilityBoundWidgets.Add(ActivatableWidget);ActivatableWidget->OnActivated().AddUObject(this, &UCommonActivatableWidget::HandleVisibilityBoundWidgetActivations);ActivatableWidget->OnDeactivated().AddUObject(this, &UCommonActivatableWidget::HandleVisibilityBoundWidgetActivations);HandleVisibilityBoundWidgetActivations();}
}