import sys
from PyQt5.QtWidgets import *

class WindowDemo(QWidget):
  def __init__(self):
    super(WindowDemo, self).__init__()
    self.initUI()
  def initUI(self):
    #实例化列表控件
    combo=QComboBox(self)
    #设置列表控件的名称
    combo.setObjectName('myQComboBox')

    #添加条目到列表控件
    combo.addItem('Window')
    combo.addItem('Ubuntu')
    combo.addItem('Red Hat')
    #控件移动到指定位置
    combo.move(50,50)
    #设置窗口的标题与初始窗口的属性
    self.setGeometry(250,200,320,150)
    self.setWindowTitle('QComboBox样式')

    #设置样式

    qssStyle='''
    QComboBox#myQComboBox::drop-down{
    image:url(./images/dropdown.png)
    } 
    QComboBox#myQComboBox::drop-down:hover{
    background-color:red
    }
    '''
    self.setStyleSheet(qssStyle)
if __name__ == '__main__':
  app=QApplication(sys.argv)
  win=WindowDemo()
  win.show()
  sys.exit(app.exec_())

import logging
import sys
from PyQt5 import QtWidgets, QtCore
# make the example runnable without the need to install
from os.path import abspath, dirname
sys.path.insert(0, abspath(dirname(abspath(__file__)) + '/..'))

import qdarkstyle
import ui.example_pyqt5_ui as example_ui


def main():
  """
  Application entry point
  """
  logging.basicConfig(level=logging.DEBUG)
  # create the application and the main window
  app = QtWidgets.QApplication(sys.argv)
  window = QtWidgets.QMainWindow()

  # setup ui
  ui = example_ui.Ui_MainWindow()
  ui.setupUi(window)
  ui.bt_delay_popup.addActions([
    ui.actionAction,
    ui.actionAction_C
  ])
  ui.bt_instant_popup.addActions([
    ui.actionAction,
    ui.actionAction_C
  ])
  ui.bt_menu_button_popup.addActions([
    ui.actionAction,
    ui.actionAction_C
  ])
  item = QtWidgets.QTableWidgetItem("Test")
  item.setCheckState(QtCore.Qt.Checked)
  ui.tableWidget.setItem(0, 0, item)
  window.setWindowTitle("QDarkStyle example")

  # tabify dock widgets to show bug #6
  window.tabifyDockWidget(ui.dockWidget1, ui.dockWidget2)

  # setup stylesheet
  app.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())

  # auto quit after 2s when testing on travis-ci
  if "--travis" in sys.argv:
    QtCore.QTimer.singleShot(2000, app.exit)

  # run
  window.show()
  app.exec_()


if __name__ == "__main__":
  main()