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Diffstat (limited to 'examples/widgets/tutorials/cannon/t9.py')
-rw-r--r-- | examples/widgets/tutorials/cannon/t9.py | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/examples/widgets/tutorials/cannon/t9.py b/examples/widgets/tutorials/cannon/t9.py new file mode 100644 index 000000000..7cdda4e7b --- /dev/null +++ b/examples/widgets/tutorials/cannon/t9.py @@ -0,0 +1,122 @@ +# Copyright (C) 2022 The Qt Company Ltd. +# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause + +# PySide6 tutorial 9 + + +import sys + +from PySide6.QtCore import QRect, Qt, Signal, Slot, 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(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) + + 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.setPen(Qt.NoPen) + painter.setBrush(Qt.blue) + + painter.translate(0, self.rect().height()) + painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16) + painter.rotate(-self._current_angle) + painter.drawRect(QRect(33, -4, 15, 8)) + + +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()) |