bevy/crates/bevy_ui/src/layout
ickshonpe a2bd93aedc
Make GridPlacement's fields non-zero and add accessor functions. (#9486)
# Objective

* There is no way to read the fields of `GridPlacement` once set. 
* Values of `0` for `GridPlacement`'s fields are invalid but can be set.
* A non-zero representation would be half the size.

fixes #9474

## Solution
* Add `get_start`, `get_end` and `get_span` accessor methods.
* Change`GridPlacement`'s constructor functions to panic on arguments of
zero.
* Use non-zero types instead of primitives for `GridPlacement`'s fields.

---

## Changelog

`bevy_ui::ui_node::GridPlacement`:
* Field types have been changed to `Option<NonZeroI16>` and
`Option<NonZeroU16>`. This is because zero values are not valid for
`GridPlacement`. Previously, Taffy interpreted these as auto variants.
* Constructor functions for `GridPlacement` panic on arguments of `0`.
* Added accessor functions: `get_start`, `get_end`, and `get_span`.
These return the inner primitive value (if present) of the respective
fields.

## Migration Guide
`GridPlacement`'s constructor functions no longer accept values of `0`.
Given any argument of `0` they will panic with a `GridPlacementError`.
2023-08-28 17:21:08 +00:00
..
convert.rs Make GridPlacement's fields non-zero and add accessor functions. (#9486) 2023-08-28 17:21:08 +00:00
debug.rs UI layout tree debug print (#8521) 2023-05-08 13:56:19 +00:00
mod.rs round_ties_up fix (#9548) 2023-08-23 18:32:29 +00:00