Creating Property Type Customizations for Specialized Data

In this lesson, you will learn how to replace messy, raw struct inputs in the Details Panel with intuitive, designer-friendly controls using Property Type Customizations.

Why Customize Properties?

When you define a complex USTRUCT in C++, Unreal Engine’s default Details Panel often renders it as a nested, confusing list of fields. While functional, this forces designers to edit variables one-by-one, which is prone to error. Property Type Customizations allow you to take control of how a specific data type is drawn, letting you replace a standard numerical input with a slider, a dropdown, or even a custom visual picker.

How It Works

To create a custom look, you implement the IPropertyTypeCustomization interface. This allows you to "intercept" the rendering of your struct. Instead of the engine simply listing every member, you use a IDetailPropertyRow or IPropertyHandle to build a custom UI.

For example, imagine you have a FHealthSettings struct with a Percentage float. Instead of a text box, you can create a custom drawer that renders a slider linked to that specific property:

void FHealthSettingsCustomization::CustomizeHeader(TSharedRef<IPropertyHandle> PropertyHandle, FDetailWidgetRow& HeaderRow, IPropertyTypeCustomizationUtils& Utils)
{
    // We replace the default label with a custom one
    HeaderRow.NameContent()
    [
        PropertyHandle->CreatePropertyNameWidget()
    ]
    .ValueContent()
    [
        // Here we build a custom slider widget that manipulates the property directly
        SNew(SSlider)
        .Value_Lambda([PropertyHandle] { float Val; PropertyHandle->GetValue(Val); return Val; })
        .OnValueChanged_Lambda([PropertyHandle](float NewVal) { PropertyHandle->SetValue(NewVal); })
    ];
}

Bridging the Gap

By separating your "raw data" from your "editor UI," you allow developers to write clean, logical C++ structs while ensuring your designers have a polished, mistake-proof interface. You aren't changing the data itself; you are simply building a "remote control" that makes modifying that data safer and faster.

Key Takeaway: Property Type Customizations transform raw C++ struct data into intuitive, designer-friendly Editor UI, reducing input errors and significantly improving workflow efficiency.