01 Snippet

# Source URL: https://dev.epicgames.com/community/learning/tutorials/B9my/fortnite-uefn-ui-example-for-using-verse-input-and-the-ui-back-action-to-close-a-menu
# Local doc:  epic-docs/community/learning/tutorials/B9my/fortnite-uefn-ui-example-for-using-verse-input-and-the-ui-back-action-to-close-a-menu.md
using { /Fortnite.com/Devices }
using { /Fortnite.com/UI }
using { /UnrealEngine.com/Temporary/UI }
using { /Verse.org/Simulation }
using { /Verse.org/Input }
using { /Verse.org/Input/UI }

ui_mode_device := class(creative_device):

    # The volume to open the UI.
    @editable
    ShowVolume : volume_device = volume_device{}

    # Your UMG widget.
    RootWidget : UserInterfaces.UW_ActionWidget = UserInterfaces.UW_ActionWidget{}

    var CurrentPlayer : ?player = false

    OnBegin<override>() : void =
        ShowVolume.AgentEntersEvent.Subscribe(OnAgentEntered)

    # Fires when any agent walks into the volume
    OnAgentEntered(Agent : agent) : void =
        if (Player := player[Agent]):
            set CurrentPlayer = option{ Player }
            OpenUI(Player)

    # Spawns the UI on screen and switches the player into UI input mode