I cannot call OnValueChanged(...) of SNumericEntryBox

Development Programming & Scripting UI
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1

Hello.

I was trying to add SNumericEntryBox to my plug-in (for now I have SButton working on).

I done it with:

SNew(SNumericEntryBox<int32>)
.AllowSpin(true)
.MinValue(1).MaxValue(1000)
.MinSliderValue(1).MaxSliderValue(1000).Value(100)

I can now see the numeric entry box in my plug-in.

But when I wanted to handle value change event, adding .OnValueChanged(&Locals::numberChanged):

SNew(SNumericEntryBox<int32>)
.AllowSpin(true)
.MinValue(1).MaxValue(1000)
.MinSliderValue(1).MaxSliderValue(1000).Value(100)
.OnValueChanged(&Locals::numberChanged)

With following Locals structure:

FCopyPluginEdModeToolkit::FCopyPluginEdModeToolkit()
{
	struct Locals
	{
		
		static void numberChanged(int32 copies){
			OnButtonClick(FVector{ 0.0f, 0.0f, float(copies) }); //or whatever code here
		}

		static FReply OnButtonClick(FVector InOffset){
			//that works fine for SButton
			//...
		}
...

I got an compile-time error:

error C2664: 'SNumericEntryBox<int32>::FArguments &SNumericEntryBox<int32>::FArguments::OnValueChanged(const TBaseDelegate<void,int32> &)' : cannot convert argument 1 from 'void (__cdecl *)(int32)' to 'const TBaseDelegate<void,int32> &'
2

Try to use .OnValueChanged_Static(&Locals::numberChanged)

Protip: if youre about to create more advanced/complex UI, dont make your methods static in local struct, just take them out and put them in your main class.

3

Did you ever find a good solution? I am attempting the same thing and am having trouble passing in my delegate.

4

For anyone wondering, I think they were missing a this behind their .OnValueChanged(&Locals::numberChanged).
ending up with .OnValueChanged(this, &Locals::numberChanged).