atom/src/title-bar.js

module.exports =
class TitleBar {
  constructor ({workspace, themes, applicationDelegate}) {
    this.dblclickHandler = this.dblclickHandler.bind(this)
    this.workspace = workspace
    this.themes = themes
    this.applicationDelegate = applicationDelegate
    this.element = document.createElement('div')
    this.element.classList.add('title-bar')

    this.titleElement = document.createElement('div')
    this.titleElement.classList.add('title')
    this.element.appendChild(this.titleElement)

    this.element.addEventListener('dblclick', this.dblclickHandler)

    this.workspace.onDidChangeWindowTitle(() => this.updateTitle())
    this.themes.onDidChangeActiveThemes(() => this.updateWindowSheetOffset())

    this.updateTitle()
    this.updateWindowSheetOffset()
  }

  dblclickHandler () {
    // User preference deciding which action to take on a title bar double-click
    switch (this.applicationDelegate.getUserDefault('AppleActionOnDoubleClick', 'string')) {
      case 'Minimize':
        this.applicationDelegate.minimizeWindow()
        break
      case 'Maximize':
        if (this.applicationDelegate.isWindowMaximized()) {
          this.applicationDelegate.unmaximizeWindow()
        } else {
          this.applicationDelegate.maximizeWindow()
        }
        break
    }
  }

  updateTitle () {
    this.titleElement.textContent = document.title
  }

  updateWindowSheetOffset () {
    this.applicationDelegate.getCurrentWindow().setSheetOffset(this.element.offsetHeight)
  }
}