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# 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):
        painter = QPainter(self)

        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))
        # QPainter needs an explicit end() in PyPy. This will become a context manager in 6.3.
        painter.end()

    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())
