# Interface Definition
Components of the game's interfaces - one widget each.


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## ReadSignedShort
```pascal
function ReadSignedShort(const data: TByteArray; var offset: Integer): Integer;
```
{ref}`Read16Bits` reinterpreted as signed, for the interface fields that can be negative.


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## InterfaceDefinition.Create
```pascal
function TInterfaceDefinition.Create(id: Integer; const data: TByteArray): TInterfaceDefinition; static;
```
Decodes an interface component - one widget of the game's UI.

Unlike most definitions this is not opcode driven: the fields come in a fixed order, and which
of them are present depends on `IfType`. Only the size, type and sprite are kept, but the rest
are still read so that the ones after them land in the right place.