python+PyQT实现系统桌面时钟

用Python + PyQT写的一个系统桌面时钟，刚学习Python，写的比较简陋，但是基本的功能还可以。

功能：

①窗体在应用程序最上层，不用但是打开其他应用后看不到时间

②左键双击全屏，可以做小屏保使用，再次双击退出全屏。

③系统托盘图标，主要参考PyQt4源码目录中的PyQt4\examples\desktop\systray下的程序

④鼠标右键，将程序最小化

使用时需要heart.svg放在源代码同级目录下，[文件可在PyQt4示例代码目录下PyQt4\examples\desktop\systray\images找到

运行需要Python2.7 + PyQt4.

__metaclass__ = type
#!coding= utf-8
#http://blog.csdn.net/gatieme/article/details/17659259
#gatieme 

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import * 

#--------------------------------------------------------------------------------
class SystemTrayIcon(QSystemTrayIcon):
  """
  The systemTrayIcon which uesd to connect the clock
  """
  #----------------------------------------------------------------------------
  def __init__(self, mainWindow, parent = None):
    """
    mainWindow : the main window that the system tray icon serves to
    """
    super(SystemTrayIcon, self).__init__(parent)
    self.window = mainWindow
    self.setIcon(QIcon("heart.svg"))  # set the icon of the systemTrayIcon 

    self.createActions( )
    self.createTrayMenu( ) 

    self.connect(self, SIGNAL("doubleClicked"), self.window, SLOT("showNormal"))
    #self.connect(self, SIGNAL("activated( )"), self, SLOT("slot_iconActivated")) 

  def createActions(self):
    """
    create some action to Max Min Normal show the window
    """
    self.minimizeAction = QAction("Mi&nimize", self.window, triggered = self.window.hide)
    self.maximizeAction = QAction("Ma&ximize", self.window, triggered = self.window.showMaximized)
    self.restoreAction = QAction("&Restore", self.window, triggered = self.window.showNormal)
    self.quitAction = QAction("&Quit", self.window, triggered = qApp.quit) 

  def createTrayMenu(self):
     self.trayIconMenu = QMenu(self.window)
     self.trayIconMenu.addAction(self.minimizeAction)
     self.trayIconMenu.addAction(self.maximizeAction)
     self.trayIconMenu.addAction(self.restoreAction)
     self.trayIconMenu.addSeparator( )
     self.trayIconMenu.addAction(self.quitAction) 

     self.setContextMenu(self.trayIconMenu) 

  def setVisible(self, visible):
    self.minimizeAction.setEnabled(not visible)
    self.maximizeAction.setEnabled(not self.window.isMaximized())
    self.restoreAction.setEnabled(self.window.isMaximized() or not visible)
    super(Window, self).setVisible(visible) 

  def closeEvent(self, event):
    #if event.button( ) == Qt.RightButton:
    self.showMessage("Message",
        "The program will keep running in the system tray. To "
        "terminate the program, choose <b>Quit</b> in the "
        "context menu of the system tray entry.",
        QSystemTrayIcon.Information, 5000)
    self.window.hide( )
    event.ignore( ) 

  def slot_iconActivated(self, reason):
    if reason == QSystemTrayIcon.DoubleClick:
      self.wiondow.showNormal( ) 

#--------------------------------------------------------------------------------
class DigitClock(QLCDNumber):
  """
  the DigitClock show a digit clock int the printer
  """ 

  #----------------------------------------------------------------------------
  def __init__(self, parent = None):
    """
    the constructor function of the DigitClock
    """
    super(DigitClock, self).__init__(parent)
    pale = self.palette( ) 

    pale.setColor(QPalette.Window, QColor(100, 180, 100))
    self.setPalette(pale) 

    self.setNumDigits(19)
    self.systemTrayIcon = SystemTrayIcon(mainWindow = self) 

    self.dragPosition = None;
    self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint | Qt.Popup | Qt.Tool)
    self.setWindowOpacity(1) 

    self.showTime( )      # print the time when the clock show
    self.systemTrayIcon.show( ) # show the SystemTaryIcon when the clock show  

    self.timer = QTimer( )
    self.connect(self.timer, SIGNAL("timeout( )"), self.showTime)
    self.timer.start(1000) 

    self.resize(500, 60) 

  #----------------------------------------------------------------------------
  def showTime(self):
    """
    show the current time
    """
    self.date = QDate.currentDate( )
    self.time = QTime.currentTime( )
    text = self.date.toString("yyyy-MM-dd") + " " + self.time.toString("hh:mm:ss")
    self.display(text) 

  #----------------------------------------------------------------------------
  def mousePressEvent(self, event):
    """
    clicked the left mouse to move the clock
    clicked the right mouse to hide the clock
    """
    if event.button( ) == Qt.LeftButton:
      self.dragPosition = event.globalPos( ) - self.frameGeometry( ).topLeft( )
      event.accept( )
    elif event.button( ) == Qt.RightButton:
      self.systemTrayIcon.closeEvent(event) 

      #self.systemTrayIcon.hide( )
      #self.close( ) 

  def mouseMoveEvent(self, event):
    """
    """
    if event.buttons( ) & Qt.LeftButton:
      self.move(event.globalPos( ) - self.dragPosition)
      event.accept( ) 

  def keyPressEvent(self, event):
    """
    you can enter "ESC" to normal show the window, when the clock is Maxmize
    """
    if event.key() == Qt.Key_Escape and self.isMaximized( ):
      self.showNormal( ) 

  def mouseDoubleClickEvent(self, event):
    """
    """
    if event.buttons() == Qt.LeftButton:
      if self.isMaximized( ):
        self.showNormal( )
      else:
        self.showMaximized( ) 

if __name__ == "__main__":
  app = QApplication(sys.argv) 

  digitClock = DigitClock( )
  digitClock.show( )   

  sys.exit(app.exec_( ))

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