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