***tengri_output*** is an abstract interface layout framework.

it expresses the following notions:

* [**space:**](./src/space.rs) `Direction`, `Coordinate`, `Area`, `Size`, `Measure`

* [**output:**](./src/output.rs) `Out`, `Draw`, `Content`
  * the layout operators are generic over `Draw` and/or `Content`
  * the traits `Draw` and `Content` are generic over `Out`
  * implement `Out` to bring a layout to a new backend:
    [see `TuiOut` in `tengri_tui`](../tui/src/tui_engine/tui_output.rs)

* [**layout:**](./src/layout.rs)
  * conditionals: `When`, `Either`
  * iteration: `Map`
  * concatenation: `Bsp`
  * positioning: `Align`, `Push`, `Pull`
  * sizing: `Fill`, `Fixed`, `Expand`, `Shrink`, `Min`, `Max`
  * implement custom components (that may be backend-dependent):
    [see `tui_content` in `tengri_tui`](../tui/src/tui_content)