demo.js

function maybe_create_ai() {
    let controller = GWorld.GetAllActorsOfClass(AIController).OutActors[0]
    if (!controller) {
        let BP = Blueprint.Load('/Game/TopDownBP/Blueprints/TopDownCharacter.TopDownCharacter')
        let old = GWorld.GetAllActorsOfClass(Character).OutActors[0]
        let pos = old.GetActorLocation()
        let character = new BP.GeneratedClass(GWorld,{X:pos.X,Y:pos.Y + 200,Z:pos.Z})        
        controller = new AIController(GWorld)
        controller.Possess(character)
    }
    let callback
    function moveTo(pos) {
        let result = controller.MoveToLocation(pos,10,true,true,true,true)
        if (result == 'RequestSuccessful') {
            return new Promise(resolve => callback = resolve)
        } else if (result == 'AlreadyAtGoal') {
            return Promise.resolve()
        } else {
            return Promise.reject(new Error(result))
        }
    }
    // Hook up delegate
    controller.ReceiveMoveCompleted = [function() {
        console.log('relay',...arguments,callback)
        let fn = callback
        callback = null
        fn && fn()
    }]
    // Add js method (only visible to js)
    controller.moveTo = moveTo
    controller.destroy = function() {
        let character = controller.GetControlledPawn()        
        character.DestroyActor()
        controller.DestroyActor()        
    }
    return controller
}

function show_widget(elem) {
    if (!global.$widget) {
        let widget = GWorld.CreateWidget(JavascriptWidget, GWorld.GetPlayerController(0))
        widget.proxy = {}
        widget.JavascriptContext = Context    
        widget.AddToViewport() 
        global.$widget = widget
    }

    let widget = global.$widget
    widget.RemoveFromViewport()
    widget.SetRootWidget(elem)
    widget.AddToViewport()
}

function demo_ui() {
    let UMG = require('UMG')

    function click_1() {
        console.log("HELLO")
    }

    function click_2() {
        console.log("WORLD")
    }

    let ui = UMG.div({},
        UMG.text({},"..Hello Tencent."),
        UMG.span({},
            UMG(Button,{Slot:{Size:{SizeRule:'Fill'}},OnClicked:click_1},"This button"),
            UMG(Button,{Slot:{Size:{SizeRule:'Fill'}},OnClicked:click_2},"Rocks")
        )        
    )

    let instantiator = require('instantiator')
    show_widget(instantiator(ui))
}

module.exports = function () {        
    let controller = maybe_create_ai()
    
    function step() {
        return controller.moveTo({X:Math.random() * 500, Y:Math.random() * 100 + 300})
    }
    function sequence(head,...tail) {
        return head().then(_ => tail.length && sequence(...tail))
    }    
    sequence(step,step,step,step,step).then(_ => console.log("BT completed")).then(_ => controller.destroy())
}