wxPython 将 Esky 包装在他们自己的 SoftwareUpdate 方法中:
https://github.com/wxWidgets/wxPython/blob/master/wx/lib/softwareupdate.py
在他们的实现中,应用程序检查新版本,并询问用户是否想要更新(使用 wx GUI 进行交互)。如果用户选择更新,代码只需调用 esky 的 auto_update() 方法来处理其余部分,但他们为它提供了一个 _updateProgress 方法,该方法更新进度条并提供指示 Esky 进度的消息:
self._esky.auto_update(self._updateProgress)
...
def _updateProgress(self, status):
# Show progress of the download and install. This function is passed to Esky
# functions to use as a callback.
if self._pd is None and status.get('status') != 'done':
self._pd = wx.ProgressDialog('Software Update', ' '*40,
style=wx.PD_CAN_ABORT|wx.PD_APP_MODAL,
parent=self._parentWindow)
self._pd.Update(0, '')
if self._parentWindow:
self._pd.CenterOnParent()
simpleMsgMap = { 'searching' : 'Searching...',
'retrying' : 'Retrying...',
'ready' : 'Download complete...',
'installing' : 'Installing...',
'cleaning up' : 'Cleaning up...',}
if status.get('status') in simpleMsgMap:
self._doUpdateProgress(True, simpleMsgMap[status.get('status')])
elif status.get('status') == 'found':
self._doUpdateProgress(True, 'Found version %s...' % status.get('new_version'))
elif status.get('status') == 'downloading':
received = status.get('received')
size = status.get('size')
currentPercentage = 1.0 * received / size * 100
if currentPercentage > 99.5:
self._doUpdateProgress(False, "Unzipping...", int(currentPercentage))
else:
self._doUpdateProgress(False, "Downloading...", int(currentPercentage))
elif status.get('status') == 'done':
if self._pd:
self._pd.Destroy()
self._pd = None
wx.Yield()
def _doUpdateProgress(self, pulse, message, value=0):
if pulse:
keepGoing, skip = self._pd.Pulse(message)
else:
keepGoing, skip = self._pd.Update(value, message)
if not keepGoing: # user pressed the cancel button
self._pd.Destroy()
self._pd = None
raise UpdateAbortedError()
上面的代码直接取自https://github.com/wxWidgets/wxPython/blob/master/wx/lib/softwareupdate.py。
此功能记录在 Esky 源文件中,文件:init .py,行:689。
代码本身显示了您的回调在整个更新过程中可以看到的内容。以下是您的回调将被调用的一些摘录:
callback({"status":"searching"})
callback({"status":"found", "new_version":version})
callback({"status":"installing", "new_version":version})
for status in self.sudo_proxy.fetch_version_iter(version):
if callback is not None:
callback(status)
callback({"status":"cleaning up"})
callback({"status":"cleaning up"})
callback({"status":"error","exception":e})
callback({"status":"done"})