[TextField] Enable differentiating between typed changes and step control changes for number inputs #8760
Description
Feature request summary
There are instances where we can provide better UX if we're able to differentiate between a user typing a new value and clicking the stepper control to change the value. For example, Lets say you provided a step value of 5 and your intention is to keep the field value at multiples of 5. With the behavior today if the current typed value is 1, and they step upwards they'll go to 6, and there is no reasonable way to "autocorrect".
This may be easily achievable via a second option onStepperChange callback that would be called instead of onChange, if provided, within handleNumberChange
More context on the need for this can be found in this epic.
Rationale
- Allows different handling if the user typed a value vs changed using the step control
- Why is onChange alone insufficient?
- Autocorrecting during typed onChange events would provide an unwanted experience. Consider the case where step is 5 and the user is trying to type 25. If you autocorrect during onChange you would correct them to 5 after they press 2, and then the subsequent typed 0 will take them to 50.
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