python lcd 时间显示

#!/usr/bin/python

# QStopWatch -- a very simple stop watch

# Copyright (C) 2006 Dominic Battre <dominic {at} battre {dot} de>

# Copyright (C) 2013 ActivityWorkshop.net

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU Library General Public

# License as published by the Free Software Foundation; either

# version 2 of the License, or (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# Library General Public License for more details.

#

# You should have received a copy of the GNU Library General Public

# License along with this program; if not, write to the Free

# Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

# Versions:

# 2006-11-18  version 1.0   - simple but fully functional stop watch

# 2006-11-18  version 1.0.1 - fixed problem with QString vs. Python string

# Obtained from http://kde-apps.org/content/show.php/QStopWatch?content=48810

# 2013-06-19  version 1.1   - ported to python 2.7, qt4; used QLCDNumber for time display

import sys

from PyQt4 import QtGui, QtCore

class MainWindow(QtGui.QMainWindow):

DEFAULT_WINDOW_TITLE = "Stopwatch"

def __init__(self, *args):

apply(QtGui.QMainWindow.__init__, (self,) + args)

self.mainWidget = QtGui.QWidget(self);

self.setCentralWidget(self.mainWidget);

self.mainLayout = QtGui.QVBoxLayout(self.mainWidget)

self.buttonsWidget = QtGui.QWidget(self.mainWidget);

self.buttonsLayout = QtGui.QHBoxLayout(self.buttonsWidget)

self.txTime  = QtGui.QLCDNumber(self.mainWidget);

self.txTime.setSegmentStyle(QtGui.QLCDNumber.Flat);

self.bnStart = QtGui.QPushButton("&Start", self.buttonsWidget);

self.bnClear = QtGui.QPushButton("&Clear", self.buttonsWidget);

self.connect(self.bnStart, QtCore.SIGNAL("clicked()"), self.slotBnStartClicked)

self.connect(self.bnClear, QtCore.SIGNAL("clicked()"), self.slotBnClearClicked)

self.buttonsLayout.addWidget(self.bnStart);

self.buttonsLayout.addWidget(self.bnClear);

self.mainLayout.addWidget(self.txTime);

self.mainLayout.addWidget(self.buttonsWidget);

self.counting = False;

self.msInLastLaps = 0;

self.timer = QtCore.QTimer(self);

self.connect(self.timer, QtCore.SIGNAL("timeout()"), self.slotTimerEvent);

self.displayTime(0, False)

self.setWindowTitle(self.DEFAULT_WINDOW_TITLE)

# reduce to minimum size

self.resize(self.minimumSizeHint())

def displayTime(self, msecs, exact):

ms = msecs % 1000

msecs /= 1000

sec = msecs % 60

msecs /= 60

min = msecs % 60

msecs /= 60

hours = msecs

if exact:

timestring = '%02d:%02d:%02d.%03d' % (hours, min, sec, ms)

self.txTime.setNumDigits(12 if hours > 0 else 9)

self.txTime.display(timestring)

self.setWindowTitle(self.DEFAULT_WINDOW_TITLE)

else:

timestring = '%02d:%02d:%02d' % (hours, min, sec)

self.txTime.setNumDigits(8 if hours > 0 else 5)

self.txTime.display(timestring)

self.setWindowTitle(timestring)

def slotBnStartClicked(self):

if ( self.counting ) :

print "stop  ", str(QtCore.QTime.currentTime().toString())

self.timer.stop();

self.msInLastLaps += self.startTime.msecsTo(QtCore.QTime.currentTime());

self.displayTime(self.msInLastLaps, True)

self.bnStart.setText("&Start")

else:

self.startTime = QtCore.QTime.currentTime()

print "start ", str(self.startTime.toString())

self.timer.start(500)

self.bnStart.setText("&Stop")

self.slotTimerEvent()

self.counting = not self.counting

def slotBnClearClicked(self):

print "clear";

self.msInLastLaps = 0;

self.startTime = QtCore.QTime.currentTime()

self.displayTime(0, not self.counting)

def slotTimerEvent(self):

self.displayTime(self.msInLastLaps + self.startTime.msecsTo(QtCore.QTime.currentTime()), False)

# Main method as the program entry point

def main(args):

app = QtGui.QApplication(args)

win = MainWindow()

win.show()

app.connect(app, QtCore.SIGNAL("lastWindowClosed()"), app, QtCore.SLOT("quit()"))

app.exec_()

if __name__=="__main__":

main(sys.argv)