1 files changed, 116 insertions, 0 deletions
diff --git a/examples/widgets/tutorials/cannon/t8.py b/examples/widgets/tutorials/cannon/t8.py
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index 000000000..9bb5516b8
--- /dev/null
+++ b/examples/widgets/tutorials/cannon/t8.py
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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())