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#!/usr/bin/env python
# Qt tutorial 8.
import sys
from qt import *
class LCDRange(QVBox):
def __init__(self,parent=None,name=None):
QVBox.__init__(self,parent,name)
lcd = QLCDNumber(2,self,'lcd')
self.slider = QSlider(Qt.Horizontal,self,'slider')
self.slider.setRange(0,99)
self.slider.setValue(0)
self.connect(self.slider,SIGNAL('valueChanged(int)'),lcd,SLOT('display(int)'))
self.connect(self.slider,SIGNAL('valueChanged(int)'),self,PYSIGNAL('valueChanged(int)'))
self.setFocusProxy(self.slider)
def value(self):
return self.slider.value()
def setValue(self,value):
self.slider.setValue(value)
def setRange(self,minVal,maxVal):
if minVal < 0 or maxVal > 99 or minVal > maxVal:
raise ValueError, 'LCDRange.setRange(): invalid range'
self.slider.setRange(minVal,maxVal)
class CannonField(QWidget):
def __init__(self,parent=None,name=None):
QWidget.__init__(self,parent,name)
self.ang = 45
self.setPalette(QPalette(QColor(250,250,200)))
def angle(self):
return self.ang
def setAngle(self,degrees):
if degrees < 5:
degrees = 5
if degrees > 70:
degrees = 70
if self.ang == degrees:
return
self.ang = degrees
self.repaint()
self.emit(PYSIGNAL('angleChanged(int)'),(self.ang,))
def paintEvent(self,ev):
p = QPainter(self)
p.drawText(200,200,'Angle = %d' % (self.ang))
def sizePolicy(self):
return QSizePolicy(QSizePolicy.Expanding,QSizePolicy.Expanding)
class MyWidget(QWidget):
def __init__(self,parent=None,name=None):
QWidget.__init__(self,parent,name)
quit = QPushButton('Quit',self,'quit')
quit.setFont(QFont('Times',18,QFont.Bold))
self.connect(quit,SIGNAL('clicked()'),qApp,SLOT('quit()'))
self.angle = LCDRange(self,'angle')
self.angle.setRange(5,70)
self.cannonField = CannonField(self,'cannonField')
self.connect(self.angle,PYSIGNAL('valueChanged(int)'),self.cannonField.setAngle)
self.connect(self.cannonField,PYSIGNAL('angleChanged(int)'),self.angle.setValue)
grid = QGridLayout(self,2,2,10)
grid.addWidget(quit,0,0)
grid.addWidget(self.angle,1,0,Qt.AlignTop)
grid.addWidget(self.cannonField,1,1)
grid.setColStretch(1,10)
self.angle.setValue(60)
self.angle.setFocus()
a = QApplication(sys.argv)
w = MyWidget()
w.setGeometry(100,100,500,355)
a.setMainWidget(w)
w.show()
a.exec_loop()
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