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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
# PySide6 tutorial 10
import sys
from PySide6.QtCore import QRect, Qt, Signal, Slot
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(f"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)
force_changed = Signal(int)
def __init__(self, parent=None):
super().__init__(parent)
self._current_angle = 45
self._current_force = 0
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 force(self):
return self._current_force
@Slot(int)
def set_force(self, force):
if force < 0:
force = 0
if self._current_force == force:
return
self._current_force = force
self.force_changed.emit(self._current_force)
def paintEvent(self, event):
with QPainter(self) as painter:
painter.setPen(Qt.NoPen)
painter.setBrush(Qt.blue)
painter.translate(0, self.height())
painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16)
painter.rotate(-self._current_angle)
painter.drawRect(QRect(33, -4, 15, 8))
def cannon_rect(self):
result = QRect(0, 0, 50, 50)
result.moveBottomLeft(self.rect().bottomLect())
return result
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)
angle = LCDRange()
angle.set_range(5, 70)
force = LCDRange()
force.set_range(10, 50)
cannon_field = CannonField()
angle.value_changed.connect(cannon_field.set_angle)
cannon_field.angle_changed.connect(angle.set_value)
force.value_changed.connect(cannon_field.set_force)
cannon_field.force_changed.connect(force.set_value)
left_layout = QVBoxLayout()
left_layout.addWidget(angle)
left_layout.addWidget(force)
grid_layout = QGridLayout(self)
grid_layout.addWidget(quit, 0, 0)
grid_layout.addLayout(left_layout, 1, 0)
grid_layout.addWidget(cannon_field, 1, 1, 2, 1)
grid_layout.setColumnStretch(1, 10)
angle.set_value(60)
force.set_value(25)
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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