Dropdown Extension

UGTK / Toolkit / Ui Module / Dropdown Extension Completed

Summary

The DropDown Extension wraps a TMP_Dropdown so it speaks strings instead of indices: it re-emits the selected option's text on change, selects an option by its label, and repopulates the whole list from a List<string>. It removes the index bookkeeping that makes dropdowns annoying as soon as the options come from data instead of being fixed in the inspector.

Modules Dependencies

None on the UGTK side. It requires Unity's TextMeshPro package (TMP_Dropdown).

Setup

Drop the Dropdown prefab under a Canvas — a TMP dropdown with Mn_UGTKDropDown_Extension already attached:

Or add the component to a GameObject that already has a TMP_Dropdown — it finds the dropdown on itself in Awake.

How To Use

// selection -> string, wired from the inspector or from code
dropdownExt.onValueChanged.AddListener(label => Debug.Log($"Chosen: {label}"));

dropdownExt.SetChoice("Italiano");                       // select by label (fires onValueChanged)
dropdownExt.FillOptions(new List<string>{ "EN","IT" });  // rebuild the whole list

onValueChanged(string) carries the text of the selected option, so a listener never has to map an index back to a meaning.
SetChoice(label) selects the option whose text matches exactly. The comparison is exact and case-sensitive, and when nothing matches nothing happens — no exception, no event, no log. Check your labels if a selection seems to be ignored.
FillOptions(labels) clears and refills the dropdown, then selects the first entry without firing onValueChanged (it uses SetValueWithoutNotify). If your UI has to react to that initial selection, call SetChoice(labels[0]) afterwards, or raise the event yourself.

Good to know:

The listener is registered in Awake and never removed. That is fine for the usual case (the component and the dropdown live on the same object), but do not destroy just the dropdown and keep this component.
Duplicate labels are ambiguous: SetChoice selects the first match. Keep labels unique, or drive the dropdown by index for those cases.
The class has no namespace — it sits in the global one — so no using is needed, but the name must stay unique in the project.

Testing Scene

Open Debug/DropdownScene.unity and press Play: pick an option and the component re-emits its label.

Technical Info

Path	Content
`Scripts/Mn_UGTKDropDown_Extension.cs`	The component: caches the `TMP_Dropdown`, listens to its `onValueChanged`, re-emits the option text, `SetChoice` and `FillOptions`
`Scripts/Editor/Mn_UGTKDropDown_ExtensionEditor.cs`	Custom inspector
`Prefabs/Dropdown.prefab`	TMP dropdown with the component attached
`Debug/DropdownScene.unity`	Test scene