I'm designing a widget to select one or multiple regions. Regions can be nested within countries and 'main' regions, like this: France - Central France - Paris - Bourgogne - ...
Need of selecting multiple data with various types at once. Drop-down lists, comboboxes or drag'n'drop list?
When an user needs to define a custom region, for example, which is composed of one or many cities/states/boroughs/countries/macro-regions (within countries)/micro-regions (within states)/etc., he/she ...