extension.js

const ExtensionUtils = imports.misc.extensionUtils
const Me = ExtensionUtils.getCurrentExtension()
const extensionName = Me.metadata.name
const { TOGGLE_STATUS } = Me.imports.enums.ToggleStatus
const { Gio, GObject, St } = imports.gi
const { main: Main, panelMenu: PanelMenu } = imports.ui
const panel = Main.panel

const ClosedIcon = 'closed-symbolic'
const OpenedIcon = 'opened-symbolic'

let icon = null
let itemsToHide = []
let panelButton = null
let toggleStatus = TOGGLE_STATUS.INACTIVE

function keepCondition(child) {
  // TODO add support to Bluetooth Battery Indicator, AppIndicator and more
  const excluded = [
    'a11y',
    'activities',
    'appMenu',
    'barmanButton',
    'dateMenu',
    'dwellClick',
    'keyboard',
    'menuButton',
    'screenRecording',
    'screenSharing',
    'uniteDesktopLabel'
  ]

  const excludedItems = Object.keys(panel.statusArea).reduce((result, key) => {
    if (excluded.includes(key)) {
      result.push(panel.statusArea[key])
    }

    return result
  }, [])

  return (
    child &&
    !excludedItems.includes(child) &&
    !String(child).includes('ActivitiesButton')
  )
}

const boxes = [panel._leftBox, panel._centerBox, panel._rightBox]

function processBoxes(boxes) {
  for (let i = 0; i < boxes.length; i++) {
    const box = boxes[i]
    const children = box.get_children()

    for (let j = 0; j < children.length; j++) {
      const item = children[j]
      const child = item.get_child()

      if (keepCondition(child)) {
        itemsToHide.push(child)
      }
    }
  }
}

function toggleItems(items, mode) {
  const action = mode === 'hide' ? 'hide' : 'show'

  for (let i = 0; i < items.length; i++) {
    const item = items[i]
    item[action]()
  }
}

function toggleBarman() {
  processBoxes(boxes)
  toggleItems(itemsToHide, 'hide')

  if (toggleStatus === TOGGLE_STATUS.INACTIVE) {
    toggleStatus = TOGGLE_STATUS.ACTIVE
    toggleItems(itemsToHide, 'hide')
    icon.gicon = Gio.icon_new_for_string(`${Me.path}/icons/${ClosedIcon}.svg`)
  } else if (toggleStatus === TOGGLE_STATUS.ACTIVE) {
    toggleStatus = TOGGLE_STATUS.INACTIVE
    toggleItems(itemsToHide, 'show')
    icon.gicon = Gio.icon_new_for_string(`${Me.path}/icons/${OpenedIcon}.svg`)
  }
}

function resetToggleStatus() {
  toggleStatus = TOGGLE_STATUS.INACTIVE
  toggleItems(itemsToHide, 'show')
  itemsToHide = []
}

function getPanelButton() {
  icon = new St.Icon({
    gicon: Gio.icon_new_for_string(`${Me.path}/icons/${OpenedIcon}.svg`),
    style_class: 'system-status-icon'
  })

  panelButton = new PanelMenu.Button(0.0, `${extensionName}`, false)
  panelButton.add_child(icon)
  panelButton.connect('button-press-event', toggleBarman)
  return panelButton
}

function addButton() {
  panel.addToStatusArea('barmanButton', getPanelButton(), 99)
}

function removeButton() {
  resetToggleStatus()
  icon = null
  panelButton.destroy()
  panelButton = null
}

function init() {
  log(`initializing ${extensionName}`)
}

function enable() {
  addButton()
}

function disable() {
  removeButton()
}