FontComboBox

A ComboBox that lists every font family installed on the system. The selection is exposed both as a FontFamily and as a string name, so a view model can bind whichever it stores.

<mosaic:FontComboBox SelectedFontName="{Binding EditorFontName, Mode=TwoWay}" />

Rendering each font name in its own font turns the drop-down into a font preview:

<mosaic:FontComboBox
    PreviewFontSize="16"
    ShowFontPreview="True"
    SelectedFontFamily="{Binding EditorFont, Mode=TwoWay}" />

Property	Type	Default	Description
SelectedFontFamily	FontFamily?	null	The selected family. Two-way by default.
SelectedFontName	string?	null	The selected family name, e.g. Segoe UI. Two-way by default.
ShowFontPreview	bool	false	Renders each font name in its own font.
PreviewFontSize	double	14	Size of the preview text.

Notes:

• The item list comes from FontFamilyCatalog — do not set ItemsSource manually.
• SelectedFontFamily, SelectedFontName, and SelectedItem all stay in sync; setting any one updates the others.
• A family that is not installed cannot be selected and leaves the selection empty. Matching is by family name, ignoring case, so new FontFamily("Arial") resolves to the catalog's instance.
• Assigning an ItemTemplate explicitly overrides whatever ShowFontPreview would apply.
• The control reuses the standard (or opt-in native Mosaic) ComboBox styling — no custom template.
• FontFamilyCatalog.Families enumerates the installed fonts once per application and is shared by every font control; the list is not refreshed if fonts are installed or removed while the application is running.

See also: FontAutoCompleteBox.