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#!/usr/bin/python
# .+
#
# .identifier : $Id:$
# .context : Application View Controller
# .title : Random generation fo count down windows (Qt3)
# .kind : python source
# .author : Fabrizio Pollastri
# .site : Torino - Italy
# .creation : 9-May-2008
# .copyright : (c) 2008 Fabrizio Pollastri.
# .license : GNU General Public License (see below)
#
# This file is part of "AVC, Application View Controller".
#
# AVC is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# AVC 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# .-
from qt import * # Qt interface
from qtui import * # ui files realizer
import sys # system support
from avc import * # AVC
from random import randint # random integer generator
UI_MAIN = 'qt3_countdown_main.ui' # qt ui descriptor for main window
UI_CD = 'qt3_countdown.ui' # qt ui descriptor for countdown window
TOPLEVEL_NAME = 'countdown' # name of the top level widget
FIRST_COUNT_DELAY = 1000 # let avc_init be called
COUNTDOWN_PERIOD = 500 # count down at 2 unit per second
MAX_CREATION_PERIOD = 4000 # create a new count down at 1/2 this
class Countdown(AVC):
"""
A countdown counter displayed in a Label widget. Count starts at given
value. When count reaches zero the counter and its GUI are destroyed.
"""
def __init__(self,count_start=10):
# create GUI
self.root = QWidgetFactory.create(UI_CD)
self.root.show()
# init the counter variable
self.counter = count_start
# connect counter variable with label widget
self.avc_connect(self.root)
# start count down
self.timer = QTimer(self.root)
self.root.connect(self.timer,SIGNAL("timeout()"),self.decrementer)
self.timer.start(COUNTDOWN_PERIOD)
def decrementer(self):
"Counter decrementer. Return False to destroy previous timer."
self.counter -= 1
# if counter reached zero, destroy this countdown and its GUI
if not self.counter:
self.timer.stop()
del self.timer
self.root.close()
class Example(QApplication,AVC):
"""
Continuously create at random intervals windows with a countdown from 10 to 0.
When a countdown reaches zero, its window is destroyed. Also create a main
window with a "close all" button.
"""
def __init__(self):
# create main window
QApplication.__init__(self,sys.argv)
self.root = QWidgetFactory.create(UI_MAIN)
self.setMainWidget(self.root)
self.root.show()
# close all button connected variable
self.close_all = False
# create the first countdown after avc_init call
self.timer = QTimer(self)
self.connect(self.timer,SIGNAL("timeout()"),self.new_countdown)
self.timer.start(FIRST_COUNT_DELAY)
def new_countdown(self,count_start=10):
"Create a new countdown"
# create a new countdown
Countdown(count_start)
# autocall after a random delay
self.timer.stop()
self.timer.start(randint(1,MAX_CREATION_PERIOD))
def close_all_changed(self,value):
"Terminate program at 'close all' button pressing"
self.quit()
#### MAIN
example = Example() # instantiate the application
example.avc_init() # connect widgets with variables
example.exec_loop() # run Qt event loop until quit
#### END
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