from PySide6.QtWidgets import (
    QApplication, QWidget, QVBoxLayout, QToolButton, QFrame, QLabel, QSizePolicy
)
from PySide6.QtCore import Qt, QSize
def hline():
    line = QFrame()
    line.setFrameShape(QFrame.HLine)
    line.setFrameShadow(QFrame.Plain)   # prosta, 1-pikselowa linia
    line.setLineWidth(1)
    return line


class CollapsiblePanel(QWidget):
    def __init__(self, title="", content_margins=(12, 10, 12, 12), parent=None):
        super().__init__(parent)

        # Nagłówek
        self.toggle_button = QToolButton(text=title, checkable=True, checked=False)
        self.toggle_button.setStyleSheet("QToolButton { border: none; font-weight: 600;}")
        self.toggle_button.setToolButtonStyle(Qt.ToolButtonTextBesideIcon)
        self.toggle_button.setArrowType(Qt.RightArrow)
        self.toggle_button.setIconSize(QSize(36, 36))  # domyślnie 16x16

        self.toggle_button.clicked.connect(self.on_toggle)

        # Obszar zawartości
        self.content_area = QFrame()
        self.content_area.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
        self.content_area.setMaximumHeight(0)  # startowo schowane

        # Wewnętrzny layout na Twoje widgety + PADDING (marginesy)
        self.body_layout = QVBoxLayout(self.content_area)
        l, t, r, b = content_margins
        self.body_layout.setContentsMargins(l, t, r, b)
        self.body_layout.setSpacing(6)

        # Layout zewnętrzny panelu (bez dodatkowych marginesów)
        root = QVBoxLayout(self)
        root.setContentsMargins(0, 0, 0, 0)
        root.setSpacing(0)
        root.addWidget(self.toggle_button)
        root.addWidget(self.content_area)

    def on_toggle(self, checked):
        if checked:
            self.toggle_button.setArrowType(Qt.DownArrow)
            self.content_area.setMaximumHeight(16777215)
        else:
            self.toggle_button.setArrowType(Qt.RightArrow)
            self.content_area.setMaximumHeight(0)


if __name__ == "__main__":
    app = QApplication([])

    main = QWidget()
    layout = QVBoxLayout(main)
    # layout.setContentsMargins(50, 12, 12, 12)  # marginesy całego widoku
    layout.setSpacing(8)                        # odstęp m.in. na linię

    panel1 = CollapsiblePanel("Opcje", content_margins=(50, 10, 12, 12))
    panel1.body_layout.addWidget(QLabel("Opcja A"))
    panel1.body_layout.addWidget(QLabel("Opcja B"))

    panel2 = CollapsiblePanel("Zaawansowane", content_margins=(16, 12, 16, 16))
    panel2.body_layout.addWidget(QLabel("Parametr 1"))
    panel2.body_layout.addWidget(QLabel("Parametr 2"))

    layout.addWidget(panel1)
    layout.addWidget(hline())   # separator
    layout.addWidget(panel2)
    layout.addStretch()

    main.show()
    app.exec()