03 Adding A Widget

# Source URL: https://dev.epicgames.com/documentation/en-us/fortnite/creating-and-removing-widgets-in-unreal-editor-for-fortnite
# Local doc:  epic-docs/documentation/en-us/fortnite/creating-and-removing-widgets-in-unreal-editor-for-fortnite.md
# Section:    Adding a Widget
using { /Fortnite.com/Devices }
using { /Verse.org/Simulation }
using { /UnrealEngine.com/Temporary/UI }
using { /Fortnite.com/UI }
using { /UnrealEngine.com/Temporary/SpatialMath}
hello_world_device := class(creative_device):
# Set the Button device in the Editor to reference the device in the level
@editable
MyButton : button_device = button_device{}
# A localizable message to display as text in the UI
TextForMyUI<localizes> : message = "Hello, world!"
# Runs when the device is started in a running game
OnBegin<override>()<suspends> : void =
MyButton.InteractedWithEvent.Subscribe(HandleButtonInteraction)
# A custom UI can only be associated with a specific player, and only that player can see it
HandleButtonInteraction(Agent : agent) : void =
# Agents can be a player or AI, but you can only get the UI of a player
# so you must cast the Agent, who interacted with the Button device, to the player type
if (InPlayer := player[Agent], PlayerUI := GetPlayerUI[InPlayer]):
MyUI : text_block = text_block{DefaultText := TextForMyUI}
PlayerUI.AddWidget(MyUI)