How to set a slate attribute dynamically

Development Programming & Scripting UI
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1

Hello, I have made a custom slate widget. It has a TAttribute which I want to set each time I create the slate widget. Something like this

class SURVIVALGAME_API SItemWidget : public SCompoundWidget
{
public:
	SLATE_BEGIN_ARGS(SItemWidget)
		:_GameHUD()
	{}
	SLATE_ARGUMENT(TWeakObjectPtr<class ATestHUD>, GameHUD)
	SLATE_ATTRIBUTE(int32, Test)

	SLATE_END_ARGS()

public:
	/** Constructs this widget with InArgs */
	void Construct(const FArguments& InArgs);

private:
	TWeakObjectPtr<class ATestHUD> GameHUD;

	TAttribute<int32> Test;

	TWeakObjectPtr<class ATestHUD> ParentInventoryWidget;
};

I create this slate widget inside another slate widget something like this

	TSharedPtr<SVerticalBox> Col;
	SAssignNew(Col, SVerticalBox);
	for (int32 i = 0; i < 4; i++)
	{
		Col->AddSlot()
		.HAlign(HAlign_Fill)
		.VAlign(VAlign_Fill)
		[
			SNew(SItemWidget)
			.GameHUD(GameHUD)
			.Test(i)
		];
	}

But when I access the slate values all values appear to be zeros

	ChildSlot
	[
		SNew(SBox)
		.Padding(5)
		.HeightOverride(100)
		.WidthOverride(100)
		[
			SNew(SBox)
			.HAlign(HAlign_Center)
			.VAlign(VAlign_Center)
			[
				SNew(STextBlock)
				.Text(FText::FromString(FString::FromInt(Test.Get())))
			]
		]
	];

But this doesn’t work and all values appear to be zeroes.

2

Hi,

you need to assign parameter value to actual class member, Slate wont do that for you. So at the beginning of Construct function put this:

Test = InArgs._Test;

Cheers

3

Thanks… works…

Although I have 2 simple questions…

Whats the difference between SLATE_ATTRIBUTE() and SLATE_ARGUMENT() and when should I use which?

And is it possible to change the value of test during run time by the use of a simple function?

4

For anyone finding this question:

These last 2 questions were answered at length in this related forums post.