Use case

CupertinoCheckbox is out-of-date with the current macOS native look and feel, missing features like:

• Increasing opacity while pressed
• Missing dark mode look and feel. For instance, the fill color in dark mode is a gradient.
• Drop shadow [unresolved]
• Correct background/border colors in different app lifecycle states [unresolved]

CupertinoCheckbox should also support some functionality that Checkbox has, such as:

• Ability to resolve colors in different widget states.
• Semantic labels.
• More opportunities for customizability.

Proposal

Improve the fidelity of CupertinoCheckbox to more closely match macOS native checkboxes, while providing a similar degree of customizability as Material's Checkbox.

Related to: #151252, #152519, #152517