DropdownList

Renders a Material 3 exposed dropdown menu: a read-only anchor field showing the label of the currently selected option, plus a dropdown listing every entry in options. kind picks the anchor style — filled or outlined. enabled and supportingText are forwarded, and state set to error switches the field into Material's error styling. The anchor displays the label of the option whose id equals selectedOptionId — selectedOptionId must match one of options' ids, or building this tile throws. Opening, closing and item selection are handled entirely on the client: tapping the anchor toggles the menu, tapping an item stores the new selection and closes the menu, dismissing (tapping outside) just closes it — none of this needs a round trip to the server. Dispatches onDropdownListOpen when the anchor is tapped while closed; onDropdownListItemSelected (carrying the picked option's id) when an item is picked; and onDropdownListClose whenever the menu closes — anchor tapped while open, dismissed by tapping outside, or right after an item is picked. The current selectedOptionId can be read from this tile by its id via GetData.

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