Skip to main content

DesignInfo

property DesignInfo: LongInt read write;

Example​

procedure PreserveDesignInfo(const Item: TComponent;
  var Saved: LongInt);
begin
  Saved := Item.DesignInfo;
end;

Usage​

DesignInfo reads or writes Velox LongInt component-designer metadata field.

Parameters and result

Read/write signed LongInt. The runtime does not validate a script-assigned value as coordinates or any other schema.

Behaviour

  • Meaning belongs to Velox component/designer code and can vary by context.
  • Changing it does not move a normal runtime object unless code interprets it.
  • Using it as durable application data can collide with Velox streaming/designer use.
  • The field is distinct from Tag and from Velox module FIDs/statuses.

Errors and edge cases

A nil receiver fails. Ordinary integer assignment has no semantic validation; normal Velox scripting range/conversion rules apply.

Additional Technical Info​

DesignInfo is a script-visible property declared on hidden ancestor TComponent. Visible descendant classes inherit it even though Classes/Common is intentionally omitted from the Velox and Docusaurus Code Library menus.

DesignInfo is a low-level 32-bit field reserved for component designer information. It is not a general Velox configuration slot and has no universal business meaning.

Implementation trace

PascalScript directly reads/writes Delphi TComponent.DesignInfo. Studio 37.0's component streaming code treats the low and high 16-bit halves as design-time Left and Top values when defining those properties.

Side effects and ownership

A write mutates the live component and can affect later native streaming/designer interpretation.

Performance and concurrency

O(1), unsynchronised mutable state.

Remarks

This entry describes the installed Delphi Studio 37.0 terminal reached by the Velox-modified PascalScript registration. Free Pascal is linked for compatible Object Pascal context; where implementations differ, the traced Delphi behaviour above is authoritative. The example is source-reviewed and non-destructive except where the named operation is inherently destructive.

Related entries

  • Tag is a separate native-width general-purpose field.
  • ComponentState exposes read-only lifecycle flags.

External references

Created 2026-07-15