text: try:
      from PyQt5.QtGui import *
      from PyQt5.QtCore import *
      from PyQt5.QtWidgets import *
  except ImportError:
      from PyQt4.QtGui import *
      from PyQt4.QtCore import *
  
  
  class ZoomWidget(QSpinBox): # 计数控件
  
      def __init__(self, value=100):
          super(ZoomWidget, self).__init__()
          self.setButtonSymbols(QAbstractSpinBox.NoButtons)
          self.setRange(1, 500)
          self.setSuffix(' %')
          self.setValue(value)
          self.setToolTip(u'Zoom Level')
          self.setStatusTip(self.toolTip())
          self.setAlignment(Qt.AlignCenter)
  
      def minimumSizeHint(self):
          height = super(ZoomWidget, self).minimumSizeHint().height()
          fm = QFontMetrics(self.font())
          width = fm.width(str(self.maximum()))
          return QSize(width, height)
  