用PyQt实现透明桌面时钟小部件!详解编程语言

#coding=utf-8 
''' 
Created on 2012-4-6 
  
@author: 大孟 
''' 
  
import sys 
from PyQt4 import  QtGui, QtCore  
from PyQt4.QtCore import Qt 
from PyQt4.QtCore import QPoint 
from PyQt4.QtCore import QTimer 
from PyQt4.QtCore import QTime 
from PyQt4.QtGui import QPainter 
from PyQt4.QtGui import QColor 
from PyQt4.QtGui import QPolygon 
from PyQt4.QtCore import SIGNAL as signal 
  
  
class Clock(QtGui.QWidget): 
    ''' 
    classdocs 
    ''' 
  
  
    def __init__(self): 
        ''' 
        Constructor 
        ''' 
          
        super(Clock, self).__init__()  
          
        self.hourColor=QColor(127, 0, 127); 
        self.minuteColor=QColor(0, 127, 127, 191) 
        self.secondColor=QColor(127, 127,0,120) 
        self.initUI() 
        self.timer = QTimer() 
        self.timer.timeout.connect(self.update) 
        self.timer.start(30) 
        self.show() 
          
    def handChange(self):    
          
        self.side = min(self.width(), self.height()) 
        self.hand=(max(self.side/200,4), max(self.side/100,8), max(self.side/40,30)) 
        self.hourHand=QPolygon([QPoint(self.hand[0],self.hand[1]),QPoint(-self.hand[0],self.hand[1]),QPoint(0,-self.hand[2])]) 
        self.minuteHand=QPolygon([QPoint(self.hand[0],self.hand[1]),QPoint(-self.hand[0],self.hand[1]),QPoint(0,-self.hand[2]*2)]) 
        self.secondHand=QPolygon([QPoint(self.hand[0],self.hand[1]),QPoint(-self.hand[0],self.hand[1]),QPoint(0,-self.hand[2]*3)]) 
      
    def set_transparency(self, enabled): 
        if enabled: 
            self.setAutoFillBackground(False) 
        else: 
            self.setAttribute(Qt.WA_NoSystemBackground, False) 
        #下面这种方式好像不行 
#        pal=QtGui.QPalette() 
#        pal.setColor(QtGui.QPalette.Background, QColor(127, 127,10,120)) 
#        self.setPalette(pal) 
        self.setAttribute(Qt.WA_TranslucentBackground, enabled) 
        self.repaint() 
     
    def initUI(self):      
   
        self.setGeometry(300, 300, 300, 200) 
        self.setWindowTitle('Clock') 
        self.handChange() 
        self.rightButton=False 
        # 下面两个配合实现窗体透明和置顶 
        sizeGrip=QtGui.QSizeGrip(self) 
        self.setWindowFlags(Qt.FramelessWindowHint|Qt.WindowStaysOnTopHint|Qt.SubWindow ) 
        #self.setMouseTracking(True); 
        self.trans=True 
  
        self.set_transparency(True) 
  
        quitAction = QtGui.QAction(QtGui.QIcon('quit.png'), '&Quit', self) 
        self.connect(quitAction,signal("triggered()"),QtGui.qApp.quit) 
        backAction = QtGui.QAction( '&Back', self) 
        self.connect(backAction,signal("triggered()"),self.backClicked) 
        self.popMenu= QtGui.QMenu() 
        self.popMenu.addAction(quitAction) 
        self.popMenu.addAction(backAction) 
    
          
    def resizeEvent(self, e):  
        self.handChange() 
          
    def backClicked(self): 
        if self.trans == True : 
            self.trans = False  
            self.set_transparency(False) 
        else: 
            self.trans = True 
            self.set_transparency(True) 
          
    def mouseReleaseEvent(self,e): 
        if self.rightButton == True: 
            self.rightButton=False 
            self.popMenu.popup(e.globalPos()) 
  
    def mouseMoveEvent(self, e): 
        if e.buttons() & Qt.LeftButton: 
            self.move(e.globalPos()-self.dragPos) 
            e.accept() 
    def mousePressEvent(self, e): 
        
        if e.button() == Qt.LeftButton: 
            self.dragPos=e.globalPos()-self.frameGeometry().topLeft() 
            e.accept() 
        if e.button() == Qt.RightButton and self.rightButton == False: 
            self.rightButton=True 
      
    def paintEvent(self, e): 
        time = QTime.currentTime() 
        qp = QPainter() 
  
        qp.begin(self) 
        #qp.setRenderHint(QPainter.Antialiasing)  # 开启这个抗锯齿,会很占cpu的! 
        qp.translate(self.width() / 2, self.height() / 2) 
        qp.scale(self.side / 200.0, self.side / 200.0) 
   
        qp.setPen(QtCore.Qt.NoPen) 
        qp.setBrush(self.hourColor) 
        qp.save() 
        qp.rotate(30.0 * ((time.hour() + time.minute()/ 60.0))) 
        qp.drawConvexPolygon(self.hourHand) 
        qp.restore() 
          
        qp.setPen(self.hourColor) 
        for i in range(12): 
            qp.drawLine(88, 0, 96, 0) 
            qp.rotate(30.0) 
          
        qp.setPen(QtCore.Qt.NoPen) 
        qp.setBrush(self.minuteColor) 
        qp.save() 
          
        qp.rotate(6.0 * ((time.minute() + (time.second()+time.msec()/1000.0) / 60.0))) 
        qp.drawConvexPolygon(self.minuteHand) 
        qp.restore() 
          
          
        qp.setPen(self.minuteColor) 
        for i in range(60): 
            if (i % 5) is not 0: 
                qp.drawLine(92, 0, 96, 0) 
            qp.rotate(6.0) 
          
        qp.setPen(QtCore.Qt.NoPen) 
        qp.setBrush(self.secondColor) 
        qp.save() 
        qp.rotate(6.0*(time.second()+time.msec()/1000.0)) 
        qp.drawConvexPolygon(self.secondHand) 
        qp.restore() 
        qp.end() 
if __name__ == '__main__': 
    app = QtGui.QApplication(sys.argv) 
    clock = Clock() 
    sys.exit(app.exec_())