How to exit Brightscript SceneGraph application programmatically?

You can easily exit from Roku scenegraph by using complete executions of your main method.

You need to observed field on your scene and fire a roSGNodeEvent.

Your main scene will look like this.

screen = CreateObject("roSGScreen")
m.port = CreateObject("roMessagePort")
screen.setMessagePort(m.port)
scene = screen.CreateScene("mainScene")
screen.show()
scene.setFocus(true)

while(true)
  msg = wait(0, m.port)
  msgType = type(msg)

  if msgType = "roSGScreenEvent" then
    if msg.isScreenClosed() then
      return
    end if
  end if
end while

While loop running throughout the app and observer your event. isScreenClose() method return true when your scene would in focus but depends on your requirement and your event to close the app.

after modifying the main scene

screen = CreateObject("roSGScreen")
m.port = CreateObject("roMessagePort")
screen.setMessagePort(m.port)
scene = screen.CreateScene("mainScene")
screen.show()
scene.observeField("appExit", m.port)
scene.setFocus(true)

while(true)
  msg = wait(0, m.port)
  msgType = type(msg)

  if msgType = "roSGScreenEvent" then
    if msg.isScreenClosed() then
      return
    else if msgType = "roSGNodeEvent" then
      field = msg.getField()
      if field = "appExit" then
        return
      end if
    end if
  end if
end while

ChangeMainScene.xml so it has an observable interface boolean field called appExit

<?xml version="1.0" encoding="utf-8" ?>

<!-- main node which handles home screen children -->
<component name="MainScene" extends="Scene"> <interface> <!-- Specifies the content for the GridPannel --> <field id="appExit" type="bool" alwaysnotify="true" value="false"/> </interface> </component>

 

Setup your key event like this

function init() as Void
    print "ExitApp"
end function

function onKeyEvent(key as String, press as Boolean) as Boolean
    if key = "OK" then
        m.top.appExit = true
    end if
end function