lightdm-webkit2-greeter/themes/dracula/js/battery.js

class Battery {
  constructor() {
    this._battery = document.querySelector("#battery-label");
    this._info = {};
    this._init();
  }

  _updateData() {
    this._info = lightdm.batteryData;
    var level = this._info.level;
    var state = this._info.state;
    var ac = this._info.ac_status;
    var icon = 0;
    var charging = "";
    var blevel = Math.floor(level / 10) * 10;
    icon = `-${blevel}`;
    charging = ac == 1 ? "-charging" : "";

    if (blevel < 10) icon = "-outline";
    if (level == 100 && ac == 0) {
      icon = "";
    }
    if (level >= 0) {
      this._battery.style.visibility = "visible";
      this._battery.innerHTML = `<span class="mdi mdi-battery${charging}${icon}"></span> ${level}%`;
    } else {
      this._battery.innerHTML = "";
      this._battery.style.visibility = "hidden";
    }
  }

  _setTimer() {
    if (!lightdm.can_access_battery) return;
    this._updateData();
  }

  _init() {
    this._setTimer();
  }
}