SandboxStatics.cpp

#include "Sandbox.h"
#include "SandboxStatics.h"

USandboxStatics::USandboxStatics(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{
}

void USandboxStatics::GetStringHeightAndWidth(const UFont *Font, const FString & InString, int32& Height, int32& Width)
{
	Font->GetStringHeightAndWidth(InString, Height, Width);
}

FString USandboxStatics::CalculateMaxCharacterLength(FString InString, const UFont* Font, const float MaximumDrawLength)
{
	FString RemainingString = FString(InString);
	do
	{
		int32 Height, Width;
		Font->GetStringHeightAndWidth(RemainingString, Height, Width);
		
		if (Width < MaximumDrawLength)
			return RemainingString;

		// The string is still too wide for where we're trying to place it, remove another character.
		RemainingString.RemoveAt(RemainingString.Len() - 1, 1, false);
	} while (InString.Len() > 0);

	return FString();
}

SandboxStatics.h

UCLASS()
class SANDBOX_API USandboxStatics : public UBlueprintFunctionLibrary
{
	GENERATED_UCLASS_BODY()

public:
	UFUNCTION(BlueprintCallable, BlueprintPure, Category = "Game|UI|Font", DisplayName = "Get String Height and Width", meta = (WorldContext = "WorldContextObject"))
	static void GetStringHeightAndWidth(const UFont *Font, const FString & InString, int32& Height, int32& Width);

	UFUNCTION(BlueprintCallable, BlueprintPure, Category = "Game|UI|Font", DisplayName = "Calculate Max Character Length", meta = (WorldContext = "WorldContextObject"))
	static FString CalculateMaxCharacterLength(FString InString, const UFont* Font, const float MaximumDrawLength);

};