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Amanda Johnston f2c1845fba feat(datetime): add shadow parts and CSS variables for styling wheel pickers (#27529)
Issue number: resolves #25945

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## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

Datetime wheel pickers cannot be styled.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

Adds styling APIs in accordance with the Wheel Pickers and Time Picker
sections of [this design
doc](https://github.com/ionic-team/ionic-framework-design-documents/blob/main/projects/ionic-framework/components/datetime/datetime-styling.md).

Shadow parts added:
- `wheel-item`
- `wheel-item active`
- `time-button`
- `time-button active`

CSS properties added:
- `--wheel-highlight-background`
- `--wheel-fade-background-rgb`

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

<!-- If this introduces a breaking change, please describe the impact
and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->

Dev build: `7.0.7-dev.11685554390.10c2ca9b`
Docs PR: https://github.com/ionic-team/ionic-docs/pull/2982
2023-06-06 11:25:15 -05:00
..