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#!/usr/bin/python
# .+
#
# .identifier : $Id:$
# .context : Application View Controller
# .title : A counter with count speed control (Qt3)
# .kind : python source
# .author : Fabrizio Pollastri
# .site : Revello - Italy
# .creation : 17-Nov-2006
# .copyright : (c) 2006 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
UI_FILE = 'qt3_counter.ui' # qt ui descriptor
LOW_SPEED = 0.5 #--
HIGH_SPEED = 0.1 #- low and high speed period (secs)
class ExampleGUI(QApplication):
"Counter GUI creation"
def __init__(self):
# create GUI
QApplication.__init__(self,sys.argv)
self.root = QWidgetFactory.create(UI_FILE)
self.setMainWidget(self.root)
self.root.show()
def timer(self,period,function):
"Start a Qt timer calling back 'function' every 'period' seconds."
self.timer1 = QTimer()
QObject.connect(self.timer1,SIGNAL("timeout()"),function)
self.timer1.start(int(period * 1000.0))
def timer_set_period(self,period):
"Set a new period to timer"
self.timer1.stop()
self.timer1.start(int(period * 1000.0))
class ExampleMain(AVC):
"""
A counter displayed in a Label widget whose count speed can be
accelerated by checking a check box.
"""
def __init__(self,gui):
# save GUI
self.gui = gui
# the counter variable and its speed status
self.counter = 0
self.high_speed = False
# start incrementer timer
self.gui.timer(LOW_SPEED,self.incrementer)
def incrementer(self):
"""
Counter incrementer: increment period = LOW_SPEED, if high speed
is False, increment period = HIGH_SPEED otherwise.
"""
self.counter += 1
if self.high_speed:
period = HIGH_SPEED
else:
period = LOW_SPEED
self.gui.timer_set_period(period)
def high_speed_changed(self,value):
"Notify change of counting speed to terminal"
if value:
print 'counting speed changed to high'
else:
print 'counting speed changed to low'
#### MAIN
example_gui = ExampleGUI() # create the application GUI
example = ExampleMain(example_gui) # instantiate the application
example.avc_init() # connect widgets with variables
example_gui.exec_loop() # run Qt event loop until quit
#### END
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