#UI.py，通过UI设计师制作后直接转换为UI.py脚本

# -*- coding: utf-8 -*-
from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    _fromUtf8 = lambda s: s

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName(_fromUtf8("Form"))
        Form.resize(400, 300)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        Form.setWindowTitle(QtGui.QApplication.translate("Form", "Form", None, QtGui.QApplication.UnicodeUTF8))

#Main.py，可视化UI.py

# -*- coding: utf-8 -*-

from PyQt4 import QtCore, QtGui, Qt
from UI import *

class MainWindow(QtGui.QMainWindow): 

    def __init__(self,parent=None):

        QtGui.QWidget.__init__(self,parent)
        self.ui=Ui_Form()
        self.ui.setupUi(self)
        self.setWindowFlags(Qt.Qt.FramelessWindowHint)
        #窗口无边框化，写于QMainwindow所在子类初始化函数中

        #或者self.setWindowFlags(Qt.Qt.SplashScreen)

        self.setAttribute(QtCore.Qt.WA_TranslucentBackground, True)

        #窗口背景透明

    def mousePressEvent(self,event):

       #定义鼠标点击事件
       if event.button() == QtCore.Qt.LeftButton:
           self.dragPosition = event.globalPos() - self.frameGeometry().topLeft()
           event.accept()

    def mouseMoveEvent(self,event):

       #定义鼠标移动事件
        if event.buttons() ==QtCore.Qt.LeftButton:
            self.move(event.globalPos() - self.dragPosition)
            event.accept()

    def resizeEvent(self,event):

       #重绘窗体背景
        image=QtGui.QImage()
        image.load("images/background.png")
        palette=QtGui.QPalette()
        palette.setBrush(QtGui.QPalette.Window,QtGui.QBrush(image.scaled(event.size(),Qt.Qt.KeepAspectRatioByExpanding,Qt.Qt.SmoothTransformation)))
        self.setPalette(palette)

if __name__ == "__main__":

    import sys

    app = QtGui.QApplication(sys.argv)
    myapp=MainWindow()
    myapp.show()
    app.exec_()