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ask hierarchy
Ancestors above, descendants below. One of the diagram questions of the ask verb -- see Diagrams and Charts for the model, the bundle and click-to-source.
Answered in-process by the engine (drag-lint ask); no PowerShell is needed (see Charts and the IDE).
From RAD Studio: drag-lint > Reports > Ancestors and descendants (hierarchy)... -- put the caret on the selection first (see IDE Menu Reference).
drag-lint ask --question hierarchy --at <file.pas>:<line>:<col> --db <project.sqlite>
The selection is the symbol under --at (resolved exactly as Type at Cursor resolves a caret). From a terminal, ask it by name:
drag-lint ask hierarchy --target MyApp.Base.TBaseForm --db <project.sqlite>
A class or interface.
What the type inherits from (above) and what inherits from it (below). Arrows mean INHERITS FROM and all point upward. It is a DAG, not a tree: a class has one parent but any number of interfaces, so a type is drawn once and edges may converge on it.
Ancestor edges (query ancestors / query descendants); an RTL/VCL ancestor is shown when the platform library index resolves it.
Row cap (default 20).
Descendants come only from indexes you passed. A base class used across several projects shows the descendants of THIS project's closure.