尝试给 Kivy 窗口角半径时出现黑角

Question

在 MacOS 上使用 VSCode。我试图在 Python 中使用 Kivy 创建一个现代的启动屏幕。这是我的代码：

from kivy.app import App
from kivy.uix.floatlayout import FloatLayout
from kivy.graphics import Color, RoundedRectangle
from kivy.core.window import Window

class RoundedWindow(FloatLayout):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        with self.canvas.before:
            Color(0.6, 0.4, 0.8, 1)
            self.rect = RoundedRectangle(size = self.size, pos = self.pos, radius = [36])
        self.bind(size = self.update_rect, pos=self.update_rect)

    def update_rect(self, instance, value):
        self.rect.pos = self.pos
        self.rect.size = self.size

class RoundedWindowApp(App):
    def build(self):
        Window.borderless = True  
        Window.size = (360, 360) 
        return RoundedWindow()

if __name__ == '__main__':
    RoundedWindowApp().run()

运行时，Kivy 窗口的标题栏被删除，但尝试使新窗口具有角半径失败。它显示了这个：

如何去除黑角？

Answer 1

好吧，显然这种事情不值得或者根本不可能。我找到了一种在 PyQt5 上复制这个的方法。

import sys
from PyQt5.QtCore import Qt, QTimer
from PyQt5.QtGui import QPainter, QBrush, QColor, QFont
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QVBoxLayout

class RoundedWindow(QWidget):
   def __init__(self):
       super().__init__()
        
       # Set up the window properties
       self.setWindowFlags(Qt.FramelessWindowHint)  # Remove title bar
       self.setAttribute(Qt.WA_TranslucentBackground)  # Enable transparency
       self.resize(400, 300)  # Set initial window size

       # Center the window on the screen
       self.center_window()

       # Add the "Swift client" label
       label = QLabel('Swift Client', self)
       label.setAlignment(Qt.AlignCenter)
       label.setStyleSheet("color: white; font-size: 24px;")
       label.setFont(QFont("eiuroeuore", 20, QFont.Bold))

       # Use a vertical box layout to center the label
       layout = QVBoxLayout(self)
       layout.addWidget(label)
       self.setLayout(layout)
   def center_window(self):
       frame_geometry = self.frameGeometry()
       screen_center = QApplication.desktop().screenGeometry().center()
       frame_geometry.moveCenter(screen_center)
       self.move(frame_geometry.topLeft())

   def paintEvent(self, event):
        # Set rounded corners and a gradient background
       painter = QPainter(self)
       painter.setRenderHint(QPainter.Antialiasing)
       rounded_rect = self.rect()
       color = QColor(40, 44, 52)  # Dark background color
       brush = QBrush(color)
       painter.setBrush(brush)
       painter.setPen(Qt.NoPen)
       painter.drawRoundedRect(rounded_rect, 30, 30)  # 30 is the radius for rounded corners

if __name__ == "__main__":
   app = QApplication(sys.argv)
   window = RoundedWindow()
   window.show()
   sys.exit(app.exec_())