[Request] Multiselect dropdown with different than enum types

This is effectively mixing [EnumFlags] with [Dropdown] like support.

Use case:

I need to create list of strings, where each string comes from a given (not known in compile time, but known in editor - so I cannot use enum) pool and each string can only appear once.

Example:

	[MultiDropdown("GetVectorValues")]
	public List<Vector3> AllowedDirections; // I can select more than one,
                                                // but each one at most once

	private DropdownList<Vector3> GetVectorValues()
	{
		return new DropdownList<Vector3>()
		{
			{ "Right",   Vector3.right },
			{ "Left",    Vector3.left },
			{ "Up",      Vector3.up },
			{ "Down",    Vector3.down },
			{ "Forward", Vector3.forward },
			{ "Back",    Vector3.back }
		};
	}

[RunninglVlan]

+1 for MultiDropdown - “make Dropdown* support collection fields” feature. I’m using code from “In the meantime, you can achieve it like this”, and added a CustomPropertyDrawer for that inner class to get rid of unnecessary Folding in the Editor, as it’s basically one field class:

[CustomPropertyDrawer(typeof(Direction))]
public class DirectionDrawer : PropertyDrawer {
    private static string Property => nameof(Direction.value);

    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
        EditorGUI.PropertyField(position, property.FindPropertyRelative(Property));
    }
}

[dbrizov]

This is cool, I will implement it. In the meantime, you can achieve it like this. I haven’t tested this code, but it should work.

public List<Direction> AllowedDirections;

[Serializable]
public struct Direction
{
    [Dropdown("GetVectorValues")]
    public Vector3 Value;

    private DropdownList<Vector3> GetVectorValues()
    {
	return new DropdownList<Vector3>()
	{
		{ "Right",   Vector3.right },
		{ "Left",    Vector3.left },
		{ "Up",      Vector3.up },
		{ "Down",    Vector3.down },
		{ "Forward", Vector3.forward },
		{ "Back",    Vector3.back }
	};
    }
}