Get Widget Animation in C++

Development Programming & Scripting UI
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1

Hi，
I have a job to use PlayAnimation interface(UUserWidget::PlayAnimation) by C++, but the first parameter is the type of UWidgetAnimation, and the animation was created in UMG Editor. How can i get the animation by C++?

1 Like
2

You may have solved this but I’m posting a response in case it helps someone else.

I have a UMyUserWidget (name changed to protect the innocent!) class derived from UUserWidget. The following member function can be used to get a pointer to each UWidgetAnimation. I call this ONCE, when the class is instantiated, to set up a list of animation pointers that can be referenced in functions like PlayAnimation(). NOTE: Doing this in the constructor may be too early so you need to find an appropriate place that fits with your particular usage.

void UMyMenuWidget::AssignAnimations()
{
	UProperty* prop = GetClass()->PropertyLink;

	// Run through all properties of this class to find any widget animations
	while( prop != nullptr  )
	{
		// Only interested in object properties
		if( prop->GetClass() == UObjectProperty::StaticClass() )
		{
			UObjectProperty* objectProp = Cast<UObjectProperty>(prop);

			// Only want the properties that are widget animations
			if( objectProp->PropertyClass == UWidgetAnimation::StaticClass() )
			{
				UObject* object = objectProp->GetObjectPropertyValue_InContainer( this );

				UWidgetAnimation* widgetAnim = Cast<UWidgetAnimation>(object);

				if( widgetAnim != nullptr )
				{
				      // DO SOMETHING TO STORE OFF THE ANIM PTR HERE!
				      // E.g. add to a TArray of some struct that holds info for each anim
				}
			}
		}

		prop = prop->PropertyLinkNext;
	}
}

This is the only way I could find to address this issue without using blueprint visual script.

Useful note: GetFName() on a UWidgetAnimation returns the name assigned in UMG editor with “_INST” appended. You can use GetFName() on the UProperty to get the name as set in UMG.

2 Likes
3

You saved my life, man!

4

Thanks a lot, calling this in NativeContruct works fine! However this is quite ugly nevertheless. See the feature request for some kind of UPROPERTY(meta = (BindWidgetAnimation)) here: Please add UPROPERTY(meta = (BindWidget)) support for UWidgetAnimation! - Feedback for Unreal Engine team - Unreal Engine Forums

5

Yeah. I agree it’s ugly. A more immediate and official solution would be nice. Could always hide it away in a function so you don’t need to look at it. :slight_smile:

6

Hellp . I have a good way.I did it in version 4.21.

.h

TMap<FString, class UWidgetAnimation*> FindWidgetAnimation;

.cpp

// 获取UI动画
	UWidgetBlueprintGeneratedClass* WidgetClass = GetWidgetTreeOwningClass();

	FindWidgetAnimation.Empty();

	//循环遍历
	for (int i = 0; i < WidgetClass->Animations.Num(); i++) {
	
		FString Name = WidgetClass->Animations[i]->GetName();
		FindWidgetAnimation.Add(Name, WidgetClass->Animations[i]);
	}

	if (WidgetClass->Animations[0] != NULL) {
	
		UE_LOG(LogTemp, Warning, TEXT("Yes,this is Name is = %s"), *WidgetClass->Animations[0]->GetName());
	}
	else {
	
		UE_LOG(LogTemp, Warning, TEXT("并没有获取到"));
	}

260402-6o.png

260403-cit3lg7khpomecp91l.png

2 Likes
7

this is perfect thank you so much!

8

Since Unreal Engine 4.21 I use the Keyword “BindWidgetAnim”

.h

UPROPERTY(meta = (BindWidgetAnim))
UWidgetAnimation* WidgetAnimationTest;

Both names, the animation in the editor and the animation variable in the header, must be the same

2 Likes
9

Thank you!

10

Since Unreal Engine 5.0, the UPROPERTY must be

UPROPERTY(Transient, meta = (BindWidgetAnim))
UWidgetAnimation*           myAnimationName     = nullptr;

Like for widget binding, the name of variable and name into editor must be the same.

4 Likes
11

cool ! man
thanks

12

IIII LOVEEEEE YOU!!!