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#!/usr/bin/env python
# PyQt tutorial 8
import sys
from PySide2 import QtCore, QtGui
class LCDRange(QtGui.QWidget):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
lcd = QtGui.QLCDNumber(2)
self.slider = QtGui.QSlider(QtCore.Qt.Horizontal)
self.slider.setRange(0, 99)
self.slider.setValue(0)
self.connect(self.slider, QtCore.SIGNAL("valueChanged(int)"),
lcd, QtCore.SLOT("display(int)"))
self.connect(self.slider, QtCore.SIGNAL("valueChanged(int)"),
self, QtCore.SIGNAL("valueChanged(int)"))
layout = QtGui.QVBoxLayout()
layout.addWidget(lcd)
layout.addWidget(self.slider)
self.setLayout(layout)
self.setFocusProxy(self.slider)
def value(self):
return self.slider.value()
def setValue(self, value):
self.slider.setValue(value)
def setRange(self, minValue, maxValue):
if minValue < 0 or maxValue > 99 or minValue > maxValue:
QtCore.qWarning("LCDRange.setRange(%d, %d)\n"
"\tRange must be 0..99\n"
"\tand minValue must not be greater than maxValue" % (minValue, maxValue))
return
self.slider.setRange(minValue, maxValue)
class CannonField(QtGui.QWidget):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.currentAngle = 45
self.setPalette(QtGui.QPalette(QtGui.QColor(250, 250, 200)))
self.setAutoFillBackground(True)
def angle(self):
return self.currentAngle
def setAngle(self, angle):
if angle < 5:
angle = 5
if angle > 70:
angle = 70;
if self.currentAngle == angle:
return
self.currentAngle = angle
self.update()
self.emit(QtCore.SIGNAL("angleChanged(int)"), self.currentAngle)
def paintEvent(self, event):
painter = QtGui.QPainter(self)
painter.drawText(200, 200, "Angle = %d" % self.currentAngle)
class MyWidget(QtGui.QWidget):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
quit = QtGui.QPushButton("Quit")
quit.setFont(QtGui.QFont("Times", 18, QtGui.QFont.Bold))
self.connect(quit, QtCore.SIGNAL("clicked()"),
QtGui.qApp, QtCore.SLOT("quit()"))
angle = LCDRange()
angle.setRange(5, 70)
cannonField = CannonField()
self.connect(angle, QtCore.SIGNAL("valueChanged(int)"),
cannonField.setAngle)
self.connect(cannonField, QtCore.SIGNAL("angleChanged(int)"),
angle.setValue)
gridLayout = QtGui.QGridLayout()
gridLayout.addWidget(quit, 0, 0)
gridLayout.addWidget(angle, 1, 0)
gridLayout.addWidget(cannonField, 1, 1, 2, 1)
gridLayout.setColumnStretch(1, 10)
self.setLayout(gridLayout)
angle.setValue(60)
angle.setFocus()
app = QtGui.QApplication(sys.argv)
widget = MyWidget()
widget.setGeometry(100, 100, 500, 355)
widget.show()
sys.exit(app.exec_())
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