RFE: Add method to Picker to get or update internal value based on the Picker scroll wheel positions set by the user

[ThomasH99]

With the new option to add buttons to Pickers, I just realized there is a little thing missing in the Pickers: you cannot programmatically update the internal value based on the current selections in the scroll wheels. This is only done when the user presses Done.

This is an issue when a user modifies the scroll wheels manually and then press a custom button like "+7 days." The 7 days will then be added to the original internal value that eg getDate() returns and not to the value visible in the scroll wheels.

So, some method is needed for this, either (this could work for the custom buttons) an option to get value corresponding to the current position of the scroll wheels instead of the internal value (say, getPickerValue()) or a method to update the internal value based on the picker positions. I guess the first would be the cleanest and could also be used internally.

[ThomasH99]

I haven't tried the new code yet, but with the current version 7.0.242 I just realized there may be an additional conceptual issue with my suggestion. At least the issue exists with 7.0.242.

If you push +7days, it will increase the interval value with 7 days (setDate(getDate()+7d)), however, if you then press [Cancel], getDate() will now return the new (internal) value with +7 days, instead of the previous unchanged value.

So, there is a need to dissociate the original input value from the updated value (as shown by the scroll wheel or updated by the setDate()) and always have getDate() return the original input date when the user taps [Cancel] and the updated value if pressing [Done].