Hoow to create composite objects?

Development Programming & Scripting C++
1

Hello, I’m new here please be tolerant.
I developed this in C# .NET WPF and now I want to do same but in Unreal Engine 4.

I want to create programmatically a **Grid **that have Borders and **Cells. **
Cells should have 4 Borders Left, Top, Right and Bottom shared with other Cells. So for example if we have two Cells one at front of another, they will share an vertical Border. That border for one Cell instance will be on Right and to the other Cell on the Left side. So we should have two Cell owners for each Border except for ones that are at the main edge of Grid.

A Border that I implemented is one APawn having three Materials with their changes on MouseOver and MouseClick events. His Shape is just one UStaticMeshComponent created from an fbx file.
And here starts main problem - How to make composite object that represent Cell and Grid?

Sorry for my English.

2

It is hard to know the proper design you need based on your description but I’d not use Pawn here at all, unless you are possessing a Cell.
Instead I’d create a

class ACell : AActor {
UBorderComponent* TopBorder;
UBorderComponent* BottomBorder;
UBorderComponent* LeftBorder;
UBorderComponent* RightBorder;
…
}

class UBorderComponent : USceneComponent{
UMaterialInterface* Mat1;
UMaterialInterface* Mat2;
UMaterialInterface* Mat3;
…
}

with 4 UBorderComponents which themselves inherit from USceneComponent and can have a reference to another UBorderComponent, this allows you to share a reference with the neighboring UBorderComponent.

Your grid could be an AActor that then manages creating the Cells, Borders in a grid and linking the shared borders.