Popovers Deep Dive

Normally Views cannot draw outside of their Viewport. Options for influencing content outside of the Viewport include:

1) Modifying the Border behavior 2) Modifying the Margin behavior 3) Using @Terminal.Gui.App.Application.Popover

Popovers are useful for scenarios such as menus, autocomplete popups, and drop-down combo boxes.

A Popover is any View that meets these characteristics:

Implements the @Terminal.Gui.App.IPopover interface
Is Focusable (CetFocus = true)
Is Transparent (ViewportSettings = ViewportSettings.Transparent | ViewportSettings.TransparentMouse
Sets Visible = false when it receives Application.QuitKey

@Terminal.Gui.Views.PopoverMenu provides a sophisticated implementation that can be used as a context menu and is the basis for @Terminal.Gui.MenuBarv2.