Implementing Custom Details Panel Customizations

In this lesson, you will learn how to override the default property display in the Details panel to create intuitive, user-friendly interfaces for your custom Actors.

The Problem with Default Details

When you expose a C++ variable to the editor using EditAnywhere, Unreal Engine automatically generates a UI for it. While functional, it isn’t always ergonomic. Imagine a Weapon actor with an integer AmmoCount. By default, it’s just a standard text box. If you want a slider, a dropdown based on game logic, or a button that executes a specific setup function, the default view fails.

Customizing the View

To change this, we use the IDetailCustomization interface. This allows you to "hijack" the rendering of the Details panel for a specific class. Instead of the engine displaying raw properties, you provide a layout that can group settings, add decorative headers, or replace input fields with custom Slate widgets.

The core flow works like this:

1. Define a Customizer: Create a class that inherits from IDetailCustomization.
2. Override CustomizeDetails: Inside this method, you gain access to IDetailLayoutBuilder. This object allows you to hide default properties, create new "Categories," and add custom rows.
3. Register the Class: Tell the Editor’s PropertyEditorModule that your specific Actor class should now be handled by your customizer class.

// Pseudocode for adding a custom row
void FMyActorCustomization::CustomizeDetails(IDetailLayoutBuilder& DetailBuilder)
{
    // Create a new category in the details panel
    IDetailCategoryBuilder& MyCategory = DetailBuilder.EditCategory("GameSetup");

    // Add a custom button that triggers an action
    MyCategory.AddCustomRow(FText::FromString("Action"))
        [
            SNew(SButton)
            .Text(FText::FromString("Refresh Data"))
            .OnClicked(this, &FMyActorCustomization::OnRefreshClicked)
        ];
}

By manually defining the layout, you transform a cluttered list of variables into a professional-grade tool that prevents designer error and speeds up iteration. You aren't just showing variables anymore; you are building an editor tool for your specific gameplay systems.

Key Takeaway: Custom Details Panel Customizations allow you to replace standard engine-generated property fields with tailored, professional UI layouts that improve workflow efficiency for complex Actor configurations.