win-state/index.js

Save Electron apps windows state

const Store = require('electron-store')
const winstate = new Store({ name: 'win-state' })

const objectSize = function (obj) {
  return Object.keys(obj).length
}

const defaultOptions = {
  show: true,
  showCallback: null,
  close: true,
  closeCallback: null,
  load: null
}

class WinState {
  constructor () {
    this._windows = {}
    this._options = {}
  }

  _getCurrentState (id) {
    const key = `win_${id}`
    const bounds = this._windows[key].getBounds()

    return {
      bounds,
      isMaximized: this._windows[key].isMaximized()
    }
  }

  _saveState (id) {
    let state = this._getCurrentState(id)
    /* I do not know why, but keep adding 28px to y pos... at least on Linux both Unity and Gnome */
    state.bounds.y -= 28
    winstate.set(`win_${id}`, state)
  }

  _bindEvents (id) {
    const key = `win_${id}`
    const state = winstate.get(key, {})

    if (this._options[key].load) { this._windows[key].loadURL(this._options[key].load) }

    if (objectSize(state) > 0) {
      if (state.isMaximized) {
        this._windows[key].maximize()
      } else {
        this._windows[key].setBounds(state.bounds)
      }
    }

    this._windows[key].once('ready-to-show', (evt) => {
      if (this._options[key].show) { this._windows[key].show() }
      if (typeof this._options[key].showCallback === 'function') { this._options[key].showCallback() }
    })

    this._windows[key].on('close', (evt) => {
      this._saveState(id)
      if (this._options[key].close) { this._windows[key] = null }
      if (typeof this._options[key].closeCallback === 'function') { this._options[key].closeCallback() }
    })
  }

  manage (win, options) {
    const key = `win_${win.id}`

    this._options[key] = Object.assign({}, defaultOptions, options)
    this._windows[key] = win
    this._bindEvents(win.id)
  }
}

module.exports = WinState