headsetcontrol-battery-widget/package/contents/ui/main.qml

import QtQuick 2.15
import QtQuick.Layouts 1.3
import org.kde.plasma.plasmoid 2.0
import org.kde.plasma.core 2.0 as PlasmaCore
import org.kde.kirigami 2.14 as Kirigami

import "./lib/helper.js" as Helper

Item {
  id: main

  property int pollingrate: Plasmoid.configuration.pollingrate
  property int batteryheight: Plasmoid.configuration.batteryheight
  property string colorEmpty: Plasmoid.configuration.colorEmpty
  property string colorHalf: Plasmoid.configuration.colorHalf
  property string colorFull: Plasmoid.configuration.colorFull
  property int batteryPercent: -2

  PlasmaCore.DataSource {
    id: hsSource
    engine: "executable"
    connectedSources: ["headsetcontrol -bc"]
    interval: pollingrate * 1e3
    onNewData: {
      return batteryPercent = data['exit code'] > 0
        ? -2 // not connected
        : data['stdout'];
    }
  }

  Plasmoid.preferredRepresentation: Plasmoid.compactRepresentation
  Plasmoid.fullRepresentation: FullRepresentation{} 
  Plasmoid.compactRepresentation: CompactRepresentation{}
}