Struct Popup 

pub struct Popup;

Popup/Overlays are a bit difficult to handle, as there is no z-order/area tree, which would direct mouse interactions. We can simulate a z-order in the event-handler by trying the things with a higher z-order first.

If a widget should be seen as pure overlay, it would define only a Popup event-handler. In the event-handling functions you would call all Popup event-handlers before the regular ones.

Example:

• Context menu. If the context-menu is active, it can consume all mouse-events that fall into its range, and the widgets behind it only get the rest.
• Menubar. Would define two event-handlers, a regular one for all events on the main menu bar, and a popup event-handler for the menus. The event-handling function calls the popup handler first and the regular one at some time later.

Trait Implementations

impl Clone for Popup

fn clone(&self) -> Popup

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Popup

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Popup

fn default() -> Popup

Returns the “default value” for a type.

impl Copy for Popup