#Choice items

A ChoiceItem (in UIToolbox) is one choice: Text, Detail, Icon, Group, Enabled and InsertText (for an AutoCompleteField). A string converts to a ChoiceItem with only the text. The same list of items can fill a SearchDropdown and a context menu:

var commands = new List<ChoiceItem>
{
    new("New", "Ctrl+N", group: "File"),
    new("Print", "Ctrl+P", group: "File", enabled: false),
    new("Undo", "Ctrl+Z", group: "Edit")
};
search.Items = commands;

var menu = new ContextMenuComponent();
menu.AddItems(commands, item => run(item.Text));

• ContextMenuComponent.AddItems(items, picked) adds a MenuItem for each item. The detail is the shortcut text on the right. The icon and the enabled state carry over. A separator goes between two groups. picked gets the ChoiceItem that runs.
• ChoiceList is the popup list of SearchDropdown, ComboBox and AutoCompleteField: an AnchoredPopup with a ListView of group headers and items. A new control that suggests choices can use it. SetItems shows the items, MoveHighlight and PickHighlighted are the Up, Down and Enter keys, and Picked and Closed report back. IsSelected, Query, MakeItem and BindItem work as they do on SearchDropdown.
• Migration from 0.1.0: SearchDropdown.Filter and SearchDropdown.HighlightText are now on ChoiceList. BindItem is now Action<VisualElement, ChoiceItem>. The row classes are tb-choice-list__* (see SearchDropdown), and --tb-search-dropdown-match is now --tb-choice-list-match.