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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
# PySide6 tutorial 8
import sys
from PySide6.QtCore import Signal, Slot, Qt, qWarning
from PySide6.QtGui import QColor, QFont, QPainter, QPalette
from PySide6.QtWidgets import (QApplication, QGridLayout, QLCDNumber,
QPushButton, QSlider, QVBoxLayout, QWidget)
class LCDRange(QWidget):
value_changed = Signal(int)
def __init__(self, parent=None):
super().__init__(parent)
lcd = QLCDNumber(2)
self.slider = QSlider(Qt.Horizontal)
self.slider.setRange(0, 99)
self.slider.setValue(0)
self.slider.valueChanged.connect(lcd.display)
self.slider.valueChanged.connect(self.value_changed)
layout = QVBoxLayout(self)
layout.addWidget(lcd)
layout.addWidget(self.slider)
self.setFocusProxy(self.slider)
def value(self):
return self.slider.value()
@Slot(int)
def set_value(self, value):
self.slider.setValue(value)
def set_range(self, minValue, maxValue):
if minValue < 0 or maxValue > 99 or minValue > maxValue:
qWarning("LCDRange.setRange({minValue}, {maxValue})\n"
"\tRange must be 0..99\n"
"\tand minValue must not be greater than maxValue")
return
self.slider.setRange(minValue, maxValue)
class CannonField(QWidget):
angle_changed = Signal(int)
def __init__(self, parent=None):
super().__init__(parent)
self._current_angle = 45
self.setPalette(QPalette(QColor(250, 250, 200)))
self.setAutoFillBackground(True)
def angle(self):
return self._current_angle
@Slot(int)
def set_angle(self, angle):
if angle < 5:
angle = 5
if angle > 70:
angle = 70
if self._current_angle == angle:
return
self._current_angle = angle
self.update()
self.angle_changed.emit(self._current_angle)
def paintEvent(self, event):
with QPainter(self) as painter:
painter.drawText(200, 200, f"Angle = {self._current_angle}")
class MyWidget(QWidget):
def __init__(self, parent=None):
super().__init__(parent)
quit = QPushButton("Quit")
quit.setFont(QFont("Times", 18, QFont.Bold))
quit.clicked.connect(qApp.quit) # noqa: F821
angle = LCDRange()
angle.set_range(5, 70)
cannon_field = CannonField()
angle.value_changed.connect(cannon_field.set_angle)
cannon_field.angle_changed.connect(angle.set_value)
grid_layout = QGridLayout(self)
grid_layout.addWidget(quit, 0, 0)
grid_layout.addWidget(angle, 1, 0)
grid_layout.addWidget(cannon_field, 1, 1, 2, 1)
grid_layout.setColumnStretch(1, 10)
angle.set_value(60)
angle.setFocus()
if __name__ == '__main__':
app = QApplication(sys.argv)
widget = MyWidget()
widget.setGeometry(100, 100, 500, 355)
widget.show()
sys.exit(app.exec())
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