Convert UIKit keyboard animation curve to UIViewAnimationOptions

[Kyle (Kyle-Ye)]

Convert the UIKit keyboard animation curve from UIKeyboardAnimationCurveUserInfoKey
to UIViewAnimationOptions before passing it to UIView.animateWithDuration.

UIKeyboardAnimationCurveUserInfoKey contains a UIViewAnimationCurve raw value,
while UIViewAnimationOptions stores animation curve values in the curve option
bit field. Without shifting the value, non-default curves may be interpreted as
unrelated low-order animation options.

Source

SDK Header:

typedef NS_OPTIONS(NSUInteger, UIViewAnimationOptions) {
    ...
    UIViewAnimationOptionCurveEaseInOut            = 0 << 16, // default
    UIViewAnimationOptionCurveEaseIn               = 1 << 16,
    UIViewAnimationOptionCurveEaseOut              = 2 << 16,
    UIViewAnimationOptionCurveLinear               = 3 << 16,  
    ...  
} API_AVAILABLE(ios(4.0)) API_UNAVAILABLE(watchos);

Apple Documentation:
https://developer.apple.com/documentation/uikit/uiresponder/keyboardanimationcurveuserinfokey

Testing

Not run; this is a small UIKit interop conversion fix and preserves the existing
fallback behavior for missing animation curve info.

Release Notes

Fixes - iOS

• Fixed UIKit keyboard animation curve handling by converting UIKeyboardAnimationCurveUserInfoKey values to UIViewAnimationOptions.

Google CLA

Sign the Google Contributor's License Agreement at https://cla.developers.google.com to let us upstream your code to Google's AOSP repository

[Kyle (Kyle-Ye)]

I checked the downstream usage of this value to make sure the code is not intentionally depending on the raw UIViewAnimationCurve values (0, 1, 2, 3).

The animationOptions value is only threaded through KeyboardVisibilityObserver. The only non-empty consumer is the keyboard frame change path:

keyboardWillChangeFrame -> adjustViewBounds -> animateKeyboard -> UIView.animateWithDuration(options = animationOptions)

keyboardWillShow and keyboardWillHide currently do not consume this parameter.

So the final call site expects UIViewAnimationOptions, not a raw UIViewAnimationCurve. I do not see an intermediate Compose-side dependency on the unshifted 0/1/2/3 values.

cc Andrei Salavei (@ASalavei)