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_( ))

来源：https://blog.csdn.net/qq_41352018/article/details/80102659