[FIXED] border issue on frameless window with rounded edges (pyqt5)

Issue

I made a frameless window and added a function to round the edges. However, when I add a border to the window trough a style sheet, the border doesn't show on the edges like shown here.

Minimal example:

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowFlags(Qt.FramelessWindowHint)
        self.setFixedSize(300, 380)
        self.round_corners()

    def round_corners(self):
        radius = 9.0
        path = QtGui.QPainterPath()
        path.addRoundedRect(QtCore.QRectF(self.rect()), radius, radius)
        mask = QtGui.QRegion(path.toFillPolygon().toPolygon())
        self.setMask(mask)

Stylesheet:

QMainWindow
{
    background: #002025;
    border: 1px solid #093038;
}

I appreciate any ideas on how to fix that.

Solution

Try it:

from PyQt5.QtCore    import Qt, QSize, QTimer
from PyQt5.QtWidgets import (QDialog, QVBoxLayout, QWidget,
                            QPushButton, QGridLayout, QSpacerItem,
                            QSizePolicy, QLabel, QApplication)


class Dialog(QDialog):

    def __init__(self, *args, **kwargs):
        super(Dialog, self).__init__(*args, **kwargs)
        self.setObjectName('Custom_Dialog')
        self.setWindowFlags(self.windowFlags() | Qt.FramelessWindowHint | Qt.WindowStaysOnTopHint)
        self.setAttribute(Qt.WA_TranslucentBackground, True)
        self.setStyleSheet(Stylesheet)

        self.initUi()

    def initUi(self):
        # Important: this widget is used as background and rounded corners.
        self.widget = QWidget(self)
        self.widget.setObjectName('Custom_Widget')
        layout = QVBoxLayout(self)
        layout.addWidget(self.widget)

        # Add user interface to widget
        layout = QGridLayout(self.widget)
        layout.addItem(QSpacerItem(
            40, 20, QSizePolicy.Expanding, QSizePolicy.Minimum), 0, 0)
        layout.addWidget(QPushButton(
            'r', self, clicked=self.accept, objectName='closeButton'), 0, 1)
        layout.addWidget(QLabel("<h2 style='color:blue;'>Hello, world!</h2>"), 2, 0, 5, 2, alignment=Qt.AlignCenter)                           

    def sizeHint(self):
        return QSize(300, 380)        


Stylesheet = """
#Custom_Widget {
    background: #002025;
    border-radius: 20px;
    opacity: 100;
    border: 2px solid #ff2025;                   
}
#closeButton {
    min-width: 36px;
    min-height: 36px;
    font-family: "Webdings";
    qproperty-text: "r";
    border-radius: 10px;
}
#closeButton:hover {
    color: #ccc;
    background: red;
}
"""


if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    w = Dialog()
    w.exec_()
    QTimer.singleShot(200, app.quit)
    sys.exit(app.exec_())

Answered By - S. Nick