Composite Tools

[gohabereg]

Problem statement

At the moment each Tool could only be Block Tool, Inline Tool or Block Tune. It's sufficient for most of the cases. However, there are cases when a Tool needs access to capabilities of two or even all of those options. A good example is a Footnote Tool (or even Comments Tool): user should be able to select an inline fragment and link some text to it (Inline Tool capabilities). The text then could be displayed next to the Block (Block Tune capabilities) or as a separate Block in the document (Block Tool capabilities).

Proposal

The main gap for such Tools as Footnote/Comments — there is no way to share data between the Tools. My proposal is to have a Composite Tool interface which can provide several Tools of the same or different types. The wrapper would allow those Tools to have a shared state.

Possible interface:

interface CompositeTool {
  type: ToolType.Composite;

  tools: Tool[];
}

When registered via use, the Core would get the tools array and register each tool individually.